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SRC4190 (1) 192khz stereo asynchronous sample rate converters description the SRC4190 is an asynchronous sample rate converter designed for professional and broadcast audio applications. the SRC4190 combines a wide input-to-output sampling ratio with outstanding dynamic range and low distortion. input and output serial ports support standard audio formats, as well as a time division multiplexed (tdm) mode. flexible audio interfaces allow the SRC4190 to connect to a wide range of audio data converters, digital audio receivers and transmitters, and digital signal processors. the SRC4190 is a standalone pin-programmed device, with control pins for mode, data format, mute, bypass, and low group delay functions. the SRC4190 may be operated from a single +3.3v power supply. a separate digital i/o supply (v io ) operates over the +1.65v to +3.6v supply range, allowing greater flexibility when interfacing to current and future generation signal processors and logic devices. the SRC4190 is available in a ssop-28 package. features automatic sensing of the input-to- output sampling ratio wide input-to-output sampling range: 16:1 to 1:16 supports input and output sampling rates up to 212khz dynamic range: 128db (C60dbfs input, bw = 20hz to f s /2, a-weighted) thd+n: C125db (0dbfs input, bw = 20hz to f s /2) attenuates sampling and reference clock jitter high performance, linear phase digital filtering flexible audio serial ports: master or slave mode operation supports i 2 s, left justified, right justified, and tdm data formats supports 16, 18, 20, or 24-bit audio data tdm mode allows daisy chaining of up to eight devices supports 24-, 20-, 18-, or 16-bit input and output data all output data is dithered from the internal 28-bit data path low group delay option for interpolation filter soft mute function bypass mode power down mode operates from a single +3.3 volt power supply small ssop-28 package pin compatible with the src4192, ad1895, and ad1896 (2) applications digital mixing consoles digital audio workstations audio distribution systems broadcast studio equipment high-end a/v receivers general digital audio processing www.ti.com production data information is current as of publication date. products conform to specifications per the terms of texas instruments standard warranty. production processing does not necessarily include testing of all parameters. copyright ?2003, texas instruments incorporated please be aware that an important notice concerning availability, standard warranty, and use in critical applications of texas instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. sbfs023a ?june ?revised july 2003 all trademarks are the property of their respective owners. (1) patents pending. (2) refer to the applications information section of this data sheet for details. SRC4190
SRC4190 sbfs023a 2 www.ti.com supply voltage, v dd .......................................................... ?.3v to +4.0v supply voltage, v io ........................................................... ?.3v to +4.0v digital input voltage .......................................................... ?.3v to +4.0v operating temperature range ........................................ ?5 c to +85 c storage temperature range ......................................... ?5 c to +150 c note: (1) stresses above these ratings may cause permanent damage. exposure to absolute maximum conditions for extended periods may de- grade device reliability. these are stress ratings only, and functional opera- tion of the device at these or any other conditions beyond those specified is not implied. pin configuration (SRC4190) specified package temperature package ordering transport product package-lead designator (1) range marking number media, quantity SRC4190 ssop-28 db ?5 c to +85 c SRC4190i SRC4190idb rails, 50 " """" SRC4190idbr tape and reel, 2000 note: (1) for the most current specifications and package information, refer to our web site at www.ti.com. package/ordering information absolute maximum ratings (1) top view lgrp rcki n.c. sdin bcki lrcki v io dgnd bypas ifmt0 ifmt1 ifmt2 rst mute mode2 mode1 mode0 bcko lrcko sdout v dd dgnd tdmi ofmt0 ofmt1 owl0 owl1 rdy 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 SRC4190 pin# name description 1 lgrp low group delay control input (active high) 2 rcki reference clock input 3 n.c. no connection 4 sdin audio serial data input 5 bcki input port bit clock i/o 6 lrcki input port left/right word clock i/o 7v io digital i/o supply, +1.65v to v dd 8 dgnd digital ground 9 bypas asrc bypass control input (active high) 10 ifmt0 input port data format control input 11 ifmt1 input port data format control input 12 ifmt2 input port data format control input 13 rst reset input (active low) 14 mute output mute control input (active high) 15 rdy asrc ready status output (active low) 16 owl1 output port data word length control input 17 owl0 output port data word length control input 18 ofmt1 output port data format control input 19 ofmt0 output port data format control input 20 tdmi tdm data input (connect to dgnd when not in use) 21 dgnd digital ground 22 v dd digital core supply, +3.3v 23 sdout audio serial data output 24 lrcko output port left/right word clock i/o 25 bcko output port bit clock i/o 26 mode0 serial port mode control input 27 mode1 serial port mode control input 28 mode2 serial port mode control input pin descriptions (SRC4190) electrostatic discharge sensitivity this integrated circuit can be damaged by esd. texas instru- ments recommends that all integrated circuits be handled with appropriate precautions. failure to observe proper handling and installation procedures can cause damage. esd damage can range from subtle performance degradation to complete device failure. precision integrated circuits may be more susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.
SRC4190 sbfs023a 3 www.ti.com SRC4190 parameter condition min typ max units dynamic performance (1) resolution 24 bits input sampling frequency f sin 4 212 khz output sampling frequency f sout 4 212 khz input: output sampling ratio upsampling 1:16 downsampling 16:1 dynamic range bw = 20hz to f sout /2, 60dbfs input f in = 1khz, unweighted (add 3db to spec for a-weighted result) 44.1khz:48khz 125 db 48khz:44.1khz 125 db 48khz:96khz 125 db 44.1khz:192khz 125 db 96khz:48khz 125 db 192khz:12khz 125 db 192khz:32khz 125 db 192khz:48khz 125 db 32khz:48khz 125 db 12khz:192khz 125 db total harmonic distortion + noise bw = 20hz to f sout /2, 0dbfs input f in = 1khz, unweighted 44.1khz:48khz 125 db 48khz:44.1khz 125 db 48khz:96khz 125 db 44.1khz:192khz 125 db 96khz:48khz 125 db 192khz:12khz 125 db 192khz:32khz 125 db 192khz:48khz 125 db 32khz:48khz 125 db 12khz:192khz 125 db interchannel gain mismatch 0db interchannel phase deviation 0 degrees mute attenuation 24-bit word length, a-weighted 128 db digital interpolation filter characteristics passband 0.4535 x f sin hz passband ripple 0.007 db transition band 0.4535 x f sin 0.5465 x f sin hz stop band 0.5465 x f sin hz stop band attenuation 125 db normal group delay (lgrp = 0) 102.53125/f sin seconds low group delay (lgrp = 1) 70.53125/f sin seconds digital decimation filter characteristics passband 0.4535 x f sout hz passband ripple 0.008 db transition band 0.4535 x f sout 0.5465 x f sout hz stop band 0.5465 x f sout hz stop band attenuation 125 db group delay 36.46875/f sout seconds digital i/o characteristics high-level input voltage v ih 0.7 x v io v io v low level input voltage v il 0 0.3 x v io v high-level input current i ih 0.5 10 a low-level input current i il 0.5 10 a high-level output voltage v oh i o = 4ma 0.8 x v io v io v low-level output voltage v ol i o = +4ma 0 0.2 x v io v input capacitance c in 3pf electrical characteristics all parameters specified with t a = +25 c, v dd = +3.3v, and v io = +3.3v, unless otherwise noted. notes: (1) dynamic performance measured with an audio precision system two cascade or cascade plus. (2) f smin = min (f sin , f sout ). (3) f smax = max (f sin , f sout ).
SRC4190 sbfs023a 4 www.ti.com switching characteristics reference clock timing rcki frequency (2), (3) 128 x f smin 50 mhz rcki period t rckip 20 1/(128 x f smin )ns rcki pulsewidth high t rckih 0.4 x t rckip ns rcki pulsewidth low t rckil 0.4 x t rckip ns reset timing rst pulse width low t rstl 500 ns input serial port timing lrcki to bcki setup time t lris 10 ns bcki pulsewidth high t sih 10 ns bcki pulsewidth low t sil 10 ns sdin data setup time t ldis 10 ns sdin data hold time t ldih 10 ns output serial port timing sdout data delay time t dopd 10 ns sdout data hold time t doh 2ns bcko pulsewidth high t soh 10 ns bcko pulsewidth low t sol 5ns tdm mode timing lrcko setup time t lros 10 ns lrcko hold time t lroh 10 ns tdmi data setup time t tdms 10 ns tdmi data hold time t tdmh 10 ns power supplies operating voltage v dd 3.0 +3.3 3.6 v v io 1.65 +3.3 3.6 v supply current v dd = +3.3v, v io = +3.3v i dd , power down rst = 0, no clocks 100 a i dd , dynamic f sin = f sout = 192khz 66 ma i io , power down rst = 0, no clocks 100 a i io , dynamic f sin = f sout = 192khz 2 ma total power dissipation v dd = +3.3v, v io = +3.3v p d , power down rst = 0, no clocks 660 w p d , dynamic f sin = f sout = 192khz 225 mw electrical characteristics (cont.) all parameters specified with t a = +25 c, v dd = +3.3v, and v io = +3.3v, unless otherwise noted. SRC4190 parameter condition min typ max units notes: (1) dynamic performance measured with an audio precision system two cascade or cascade plus. (2) f smin = min (f sin , f sout ). (3) f smax = max (f sin , f sout ).
SRC4190 sbfs023a 5 www.ti.com typical characteristics at t a = +25 c, v dd = +3.3v, and v io = +3.3v, unless otherwise noted. 0 20 40 60 80 100 120 140 160 dbfs fft with 1khz input tone at 0dbfs (12khz:192khz) 0 20k 40k 96k 80k 60k frequency (hz) 60 70 80 90 100 110 120 130 140 150 160 170 dbfs fft with 1khz input tone at 60dbfs (12khz:192khz) 0 20k 40k 96k 80k 60k frequency (hz) 0 20 40 60 80 100 120 140 160 dbfs fft with 1khz input tone at 0dbfs (32khz:48khz) 0 5k 10k 24k 20k 15k frequency (hz) dbfs fft with 1khz input tone at 60dbfs (32khz:48khz) 0 5k 10k 24k 20k 15k frequency (hz) 60 70 80 90 100 110 120 130 140 150 160 170 0 20 40 60 80 100 120 140 160 dbfs fft with 1khz input tone at 0dbfs (44.1khz:48khz) 0 5k 10k 24k 20k 15k frequency (hz) dbfs fft with 1khz input tone at 60dbfs (44.1khz:48khz) 0 5k 10k 24k 20k 15k frequency (hz) 60 70 80 90 100 110 120 130 140 150 160 170
SRC4190 sbfs023a 6 www.ti.com typical characteristics (cont.) at t a = +25 c, v dd = +3.3v, and v io = +3.3v, unless otherwise noted. 0 20 40 60 80 100 120 140 160 dbfs fft with 1khz input tone at 0dbfs (44.1khz:96khz) 0 10k 20k 48k 40k 30k frequency (hz) dbfs fft with 1khz input tone at 60dbfs (44.1khz:96khz) 0 10k 20k 48k 40k 30k frequency (hz) 60 70 80 90 100 110 120 130 140 150 160 170 0 20 40 60 80 100 120 140 160 dbfs fft with 1khz input tone at 0dbfs (44.1khz:192khz) 0 20k 40k 96k 80k 60k frequency (hz) 60 70 80 90 100 110 120 130 140 150 160 170 dbfs fft with 1khz input tone at 60dbfs (44.1khz:192khz) 0 20k 40k 96k 80k 60k frequency (hz) 0 20 40 60 80 100 120 140 160 dbfs fft with 1khz input tone at 0dbfs (48khz:44.1khz) 0 5k 10k 22k 20k 15k frequency (hz) 60 70 80 90 100 110 120 130 140 150 160 170 dbfs fft with 1khz input tone at 60dbfs (48khz:44.1khz) 0 5k 10k 22k 20k 15k frequency (hz)
SRC4190 sbfs023a 7 www.ti.com typical characteristics (cont.) at t a = +25 c, v dd = +3.3v, and v io = +3.3v, unless otherwise noted. 0 20 40 60 80 100 120 140 160 dbfs fft with 1khz input tone at 0dbfs (48khz:96khz) 0 10k 20k 48k 40k 30k frequency (hz) dbfs fft with 1khz input tone at 60dbfs (48khz:96khz) 0 10k 20k 48k 40k 30k frequency (hz) 60 70 80 90 100 110 120 130 140 150 160 170 0 20 40 60 80 100 120 140 160 dbfs fft with 1khz input tone at 0dbfs (48khz:192khz) 0 20k 40k 96k 80k 60k frequency (hz) dbfs fft with 1khz input tone at 60dbfs (48khz:192khz) 0 20k 40k 96k 80k 60k frequency (hz) 60 70 80 90 100 110 120 130 140 150 160 170 0 20 40 60 80 100 120 140 160 dbfs fft with 1khz input tone at 0dbfs (96khz:44.1khz) 0 5k 10k 22k 20k 15k frequency (hz) 60 70 80 90 100 110 120 130 140 150 160 170 dbfs fft with 1khz input tone at 60dbfs (96khz:44.1khz) 0 5k 10k 22k 20k 15k frequency (hz)
SRC4190 sbfs023a 8 www.ti.com typical characteristics (cont.) at t a = +25 c, v dd = +3.3v, and v io = +3.3v, unless otherwise noted. 0 20 40 60 80 100 120 140 160 dbfs fft with 1khz input tone at 0dbfs (96khz:48khz) 0 5k 10k 24k 20k 15k frequency (hz) dbfs fft with 1khz input tone at 60dbfs (96khz:48khz) 0 5k 10k 24k 20k 15k frequency (hz) 60 70 80 90 100 110 120 130 140 150 160 170 0 20 40 60 80 100 120 140 160 dbfs fft with 1khz input tone at 0dbfs (96khz:192khz) 0 20k 40k 96k 80k 60k frequency (hz) dbfs fft with 1khz input tone at 60dbfs (96khz:192khz) 0 20k 40k 96k 80k 60k frequency (hz) 60 70 80 90 100 110 120 130 140 150 160 170 0 20 40 60 80 100 120 140 160 dbfs fft with 1khz input tone at 0dbfs (192khz:12khz) 01k2k 6k 5k 3k 4k frequency (hz) dbfs fft with 1khz input tone at 60dbfs (192khz:12khz) 01k2k 6k 5k 3k 4k frequency (hz) 60 70 80 90 100 110 120 130 140 150 160 170
SRC4190 sbfs023a 9 www.ti.com typical characteristics (cont.) at t a = +25 c, v dd = +3.3v, and v io = +3.3v, unless otherwise noted. 0 20 40 60 80 100 120 140 160 dbfs fft with 1khz input tone at 0dbfs (192khz:32khz) 0 2.5k 5k 16k 15k 12.5k 7.5k 10k frequency (hz) dbfs fft with 1khz input tone at 60dbfs (192khz:12khz) frequency (hz) 60 70 80 90 100 110 120 130 140 150 160 170 0 2.5k 5k 16k 15k 12.5k 7.5k 10k 0 20 40 60 80 100 120 140 160 dbfs fft with 1khz input tone at 0dbfs (192khz:44.1khz) 0 5k 10k 22k 20k 15k frequency (hz) 60 70 80 90 100 110 120 130 140 150 160 170 dbfs fft with 1khz input tone at 60dbfs (192khz:44.1khz) 0 5k 10k 22k 20k 15k frequency (hz) 20 0 40 60 80 100 120 140 160 dbfs fft with 1khz input tone at 0dbfs (192khz:48khz) 0 5k 10k 24k 20k 15k frequency (hz) dbfs fft with 1khz input tone at 60dbfs (192khz:48khz) 0 5k 10k 24k 20k 15k frequency (hz) 60 70 80 90 100 110 120 130 140 150 160 170
SRC4190 sbfs023a 10 www.ti.com typical characteristics (cont.) at t a = +25 c, v dd = +3.3v, and v io = +3.3v, unless otherwise noted. 0 20 40 60 80 100 120 140 160 dbfs fft with 1khz input tone at 0dbfs (192khz:96khz) 0 10k 20k 48k 40k 30k frequency (hz) dbfs fft with 1khz input tone at 60dbfs (192khz:96khz) 0 10k 20k 48k 40k 30k frequency (hz) 60 70 80 90 100 110 120 130 140 150 160 170 20 0 40 60 80 100 120 140 160 dbfs fft with 20khz input tone at 0dbfs (44.1khz:48khz) 0 5k 10k 24k 20k 15k frequency (hz) 0 20 40 60 80 100 120 140 160 dbfs fft with 20khz input tone at 0dbfs (48khz:44.1khz) 0 5k 10k 22k 20k 15k frequency (hz) 0 20 40 60 80 100 120 140 160 dbfs fft with 20khz input tone at 0dbfs (48khz:96khz) 0 10k 20k 48k 40k 30k frequency (hz) 20 40 60 80 100 120 140 160 dbfs fft with 20khz input tone at 0dbfs (96khz:48khz) 0 5k 10k 24k 20k 15k frequency (hz)
SRC4190 sbfs023a 11 www.ti.com typical characteristics (cont.) at t a = +25 c, v dd = +3.3v, and v io = +3.3v, unless otherwise noted. 0 20 40 60 80 100 120 140 160 dbfs fft with 80khz input tone at 0dbfs (192khz:192khz) 0 20k 40k 96k 80k 60k frequency (hz) 100 105 110 115 120 125 130 135 140 145 150 total harmonic distortion+noise (db) thd+n vs input amplitude f in = 1khz (44.1khz:48khz) 140 120 100 80 0 20 60 40 input amplitude (dbfs) 100 105 110 115 120 125 130 135 140 145 150 total harmonic distortion+noise (db) thd+n vs input amplitude f in = 1khz (48khz:44.1khz) 140 120 100 80 0 20 60 40 input amplitude (dbfs) 100 105 110 115 120 125 130 135 140 145 150 total harmonic distortion+noise (db) thd+n vs input amplitude f in = 1khz (48khz:96khz) 140 120 100 80 0 20 60 40 input amplitude (dbfs) 100 105 110 115 120 125 130 135 140 145 150 total harmonic distortion+noise (db) thd+n vs input amplitude f in = 1khz (96khz:48khz) 140 120 100 80 0 20 60 40 input amplitude (dbfs) 100 105 110 115 120 125 130 135 140 145 150 total harmonic distortion+noise (db) thd+n vs input amplitude f in = 1khz (44.1khz:192khz) 140 120 100 80 0 20 60 40 input amplitude (dbfs)
SRC4190 sbfs023a 12 www.ti.com typical characteristics (cont.) at t a = +25 c, v dd = +3.3v, and v io = +3.3v, unless otherwise noted. 100 105 110 115 120 125 130 135 140 145 150 total harmonic distortion+noise (db) thd+n vs input amplitude f in = 1khz (192khz:44.1khz) 140 120 100 80 0 20 60 40 input amplitude (dbfs) 100 105 110 115 120 125 130 135 140 145 150 total harmonic distortion+noise (db) thd+n vs input frequency with 0dbfs input (44.1khz:48khz) 0 5k 20k 10k 15k input frequency (hz) 100 105 110 115 120 125 130 135 140 145 150 total harmonic distortion+noise (db) thd+n vs input frequency with 0dbfs input = 1khz (48khz:44.1khz) 0 5k 20k 10k 15k input frequency (hz) 100 105 110 115 120 125 130 135 140 145 150 total harmonic distortion+noise (db) thd+n vs input frequency with 0dbfs (48khz:96khz) 0 5k 20k 10k 15k input frequency (hz) 100 105 110 115 120 125 130 135 140 145 150 total harmonic distortion+noise (db) thd+n vs input frequency with 0dbfs (96khz:48khz) 0 5k 20k 10k 15k input frequency (hz) 100 105 110 115 120 125 130 135 140 145 150 total harmonic distortion+noise (db) thd+n vs input frequency with 0dbfs (44.1khz:192khz) 0 5k 20k 10k 15k input frequency (hz)
SRC4190 sbfs023a 13 www.ti.com typical characteristics (cont.) at t a = +25 c, v dd = +3.3v, and v io = +3.3v, unless otherwise noted. 100 105 110 115 120 125 130 135 140 145 150 total harmonic distortion+noise (db) thd+n vs input frequency with 0dbfs (192khz:44.1khz) 0 5k 20k 10k 15k input frequency (hz) 0 10 20 30 40 50 60 70 80 90 100 110 120 130 output amplitude (dbfs) linearity with f in = 200hz (44.1khz:48khz) 130 120 110 100 90 80 70 60 50 0 40 30 20 10 input amplitude (dbfs) 0 10 20 30 40 50 60 70 80 90 100 110 120 130 output amplitude (dbfs) linearity with f in = 200hz (48khz:44.1khz) 130 120 110 100 90 80 70 60 50 0 40 30 20 10 input amplitude (dbfs) 0 10 20 30 40 50 60 70 80 90 100 110 120 130 output amplitude (dbfs) linearity with f in = 200hz (48khz:96khz) 130 120 110 100 90 80 70 60 50 0 40 30 20 10 input amplitude (dbfs) 0 10 20 30 40 50 60 70 80 90 100 110 120 130 output amplitude (dbfs) linearity with f in = 200hz (96khz:48khz) 130 120 110 100 90 80 70 60 50 0 40 30 20 10 input amplitude (dbfs) 0 10 20 30 40 50 60 70 80 90 100 110 120 130 output amplitude (dbfs) linearity with f in = 200hz (44.1khz:192khz) 130 120 110 100 90 80 70 60 50 0 40 30 20 10 input amplitude (dbfs)
SRC4190 sbfs023a 14 www.ti.com typical characteristics (cont.) at t a = +25 c, v dd = +3.3v, and v io = +3.3v, unless otherwise noted. 0 10 20 30 40 50 60 70 80 90 100 110 120 130 output amplitude (dbfs) linearity with f in = 200hz (192khz:44.1khz) 130 120 110 100 90 80 70 60 50 0 40 30 20 10 input amplitude (dbfs) 0 10 20 30 40 50 60 70 80 90 100 110 120 130 dbfs frequency response with 0dbfs input 0 10k 20k 30k 40k 60k 50k frequency (hz) 192khz:32khz 192khz:48khz 192khz:96khz 0 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 0.10 0.11 0.12 0.13 0.14 0.15 (dbfs) pass band ripple (48k:48k) 0 5k 10k 15k 22k 20k input frequency (hz) 0 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 0.10 0.11 0.12 0.13 0.14 0.15 (dbfs) pass band ripple (192k:48k) 0 5k 10k 15k 22k 20k input frequency (hz)
SRC4190 sbfs023a 15 www.ti.com product overview the SRC4190 is an asynchronous sample rate converter (asrc) designed for professional audio applications. opera- tion at input and output sampling frequencies up to 212khz is supported, with an input/output sampling ratio range of 16:1 to 1:16. excellent dynamic range and total harmonic distortion + noise (thd+n) are achieved by employing high performance and linear phase digital filtering. digital filtering options allow for lower group delay processing. the audio input and output ports support standard audio data formats, as well as a tdm interface mode. word lengths of 24-, 20-, 18-, and 16-bits are supported. both ports may operate in slave mode, deriving their word and bit clocks from external input and output devices. alternatively, one port may operate in master mode while the other remains in slave mode. in master mode, the lrck and bck clocks are derived from the reference clock input, rcki. the flexible configuration of the input and output ports allows connection to a wide variety of audio data converters, interface devices, digital signal processors, and programmable logic. a bypass mode is included, which allows audio data to be passed directly from the input port to the output port, bypass- ing the asrc function. the bypass option is useful for passing through encoded or compressed audio data, or non- audio control or status data. a soft mute function is available providing artifact-free opera- tion while muting the audio output signal. the mute attenu- ation is typically 128db. functional block diagram figure 1 shows a functional block diagram of the SRC4190. audio data is received at the input port, clocked by either the audio data source in slave mode or by the SRC4190 in master mode. the output port data is clocked by either the audio data source in slave mode, or by the SRC4190 in master mode. the input data is passed through interpolation filters which up-sample the data, which is then passed on to the re-sampler. the rate estimator compares the input and output sampling frequencies by comparing lrcki, lrcko, and a reference clock. the results include an offset for the fifo pointer and the coefficients needed for re-sampling function. the output of the re-sampler is then passed on to the decimation filter. the decimation filter performs down-sam- pling and anti-alias filtering functions. figure 1. SRC4190 functional block diagram. mode [2:0] ifmt [2:0] ofmt [1:0] owl [1:0] mute bypas lgrp rst control logic rate estimator lrcki lrcko refclk rdy lrcko bcko sdout tdmi audio output port rcki refclk reference clock lrcki bcki sdin audio input port interpolation filters 16f sin f sin f sout v dd dgnd v io dgnd re-sampler 16f sout decimation filters power
SRC4190 sbfs023a 16 www.ti.com mode2 mode1 mode0 serial port mode 0 0 0 both input and output ports are slave mode 0 0 1 output port is master mode with rcki = 128f s 0 1 0 output port is master mode with rcki = 512f s 0 1 1 output port is master mode with rcki = 256f s 1 0 0 both input and output ports are slave mode 1 0 1 input port is master mode with rcki = 128f s 1 1 0 input port is master mode with rcki = 512f s 1 1 1 input port is master mode with rcki = 256f s table 1. setting the serial port modes. reference clock the SRC4190 requires a reference clock for operation. the reference clock is applied at the rcki input, pin 2. figure 2 illustrates the reference clock connections and requirements for the SRC4190. the reference clock may operate at 128f s , 256f s , or 512f s , where f s is the input or output sampling frequency. the maximum external reference clock input frequency is 50 mhz. audio port modes the SRC4190 supports seven serial port modes, which are shown in table 1. the audio port mode is selected using the mode0 (pin 26), mode1 (pin 27), and mode2 (pin 28) inputs. in slave mode, the port lrck and bck clocks are config- ured as inputs, and receive their clocks from an external audio device. in master mode, the lrck and bck clocks are configured as outputs, being derived from the reference clock input (rcki). only one port can be set to master mode at any given time, as indicated in table 1. rst rcki t rstl > 500ns figure 2. reference clock input connections and timing requirements. t rckip t rckih t rckil rcki SRC4190 rcki from external clock source 50mhz max 2 t rckip > 20ns min t rckih > 0.4 t rckip t rckil > 0.4 t rckip figure 3. reset pulse width requirement. reset and power down operation the SRC4190 may be reset using the rst input (pin 13). there is no internal power on reset, so the user should force a reset sequence after power up in order to initialize the device. in order to force a reset, the reference clock input must be active, with an external clock source supplying a valid reference clock signal (refer to figure 2). the user must assert rst low for a minimum of 500 nanoseconds and then bring rst high again to force a reset. figure 3 shows the reset timing for the SRC4190. the SRC4190 also supports a power-down mode. power- down mode may be set by holding the rst input low. input port operation the audio input port is a three-wire synchronous serial interface that may operate in either slave or master mode. the sdin input (pin 4) is the serial audio data input. audio data is input at this pin in one of three standard audio data formats: philips i 2 s, left justified, or right justified. the audio data word length may be up to 24 bits for i 2 s and left justified formats, while the right justified format supports 16-, 18-, 20-, or 24-bit data. the data formats are shown in figure 4, while critical timing parameters are shown in figure 5 and listed in the electrical characteristics table. the bit clock is either an input or output at bcki (pin 5). in slave mode, bcki is configured as an input pin, and may operate at rates from 32f s to 128f s , with a minimum of one clock cycle per data bit. in master mode, bcki operates at a fixed rate of 64f s .
SRC4190 sbfs023a 17 www.ti.com t lris t sih t ldis t sil t ldih lrcki bcki sdin left channel (a) left justified data format (b) right justified data format right channel lrcko bcki sdin msb lsb lsb msb lrcki bcki sdin msb msb lsb lsb (c) i 2 s data format 1/f s lrcki bcki sdin msb lsb msb lsb figure 4. input data formats. figure 5. input port timing. the left/right word clock, lrcki (pin 6), may be configured as an input or output pin. in slave mode, lrcki is an input pin, while in master mode lrcki is an output pin. in either case, the clock rate is equal to f s , the input sampling frequency. the lrcki duty cycle is fixed to 50% for master mode operation. table 2 illustrates data format selection for the input port. the ifmt0 (pin 10), ifmt1 (pin 11), and ifmt2 (pin 12) inputs are utilized to set the input port data format. ifmt2 ifmt1 ifmt0 input port data format 0 0 0 24-bit left justified 0 0 1 24-bit i 2 s 0 1 0 unused 0 1 1 unused 1 0 0 16-bit right justified 1 0 1 18-bit right justified 1 1 0 20-bit right justified 1 1 1 24-bit right justified table 2. input port data format selection.
SRC4190 sbfs023a 18 www.ti.com output port operation the audio output port is a four-wire synchronous serial interface that may operate in either slave or master mode. the sdout output (pin 23) is the serial audio data output. audio data is output at this pin in one of four data formats: philips i 2 s, left justified, right justified, or tdm. the audio data word length may be 16-, 18-, 20-, or 24-bits. for all word lengths, the data is triangular pdf dithered from the internal 28-bit data path. the data formats (with the exception of tdm mode) are shown in figure 6, while critical timing parameters are shown in figure 7 and listed in the electrical characteristics table. the tdm format and timing are shown in figures 11 and 12, respectively, while examples of stan- dard tdm configurations are shown in figures 13 and 14. the bit clock is either input or output at bcko (pin 25). in slave mode, bcko is configured as an input pin, and may operate at rates from 32f s to 128f s , with a minimum of one clock cycle for each data bit. the exception is the tdm mode, where the bcko must operate at n x 64f s , where n is equal to the number of SRC4190 devices included on the tdm interface. in master mode, bcko operates at a fixed rate of 64f s for all data formats except tdm, where bcko operates at the reference clock (rcki) frequency. additional information regarding tdm mode operation is included in the applications information section of this data sheet. the left/right word clock, lrcko (pin 24), may be configured as an input or output pin. in slave mode, lrcko is an input pin, while in master mode it is an output pin. in either case, the clock rate is equal to f s , the output sampling frequency. the clock duty cycle is fixed to 50% for i 2 s, left justified, and right justified formats in master mode. the lrcko pulse width is fixed to 32 bcko cycles for the tdm format in master mode. left channel (a) left justified data format (b) right justified data format right channel lrcko bcko sdout msb lsb lsb msb lrcko bcko sdout msb msb lsb lsb (c) i 2 s data format 1/f s lrcko bcko sdout msb lsb msb lsb t soh t dopd t sol t doh lrcko bcko sdout figure 6. output data formats. figure 7. output port timing.
SRC4190 sbfs023a 19 www.ti.com table 3 illustrates data format selection for the output port. the ofmt0 (pin 19), ofmt1 (pin 18), owl0 (pin 17), and owl1 (pin 16) inputs are utilized to set the output port data format and word length. ofmt1 ofmt0 output port data format 0 0 left justified 01 i 2 s 1 0 tdm 1 1 right justified owl1 owl0 output port data word length 0 0 24 bits 0 1 20 bits 1 0 18 bits 1 1 16 bits table 3. output port data format selection. bypass mode the SRC4190 includes a bypass function, which routes the input port data directly to the output port, bypassing the asrc function. bypass mode may be invoked by forcing the bypas input (pin 9) high. for normal asrc operation, the bypas pin should be set to 0. no dithering is applied to the output data in bypass mode; digital attenuation and mute functions are also unavailable in this mode. soft mute function the soft mute function of the SRC4190 may be invoked by forcing the mute input (pin 14) high. the soft mute function slowly attenuates the output signal level down to all zeroes plus 4lsb of dither. this provides an artifact-free muting of the audio output port. ready output the SRC4190 includes an active low ready output named rdy (pin 15). this is an output from the rate estimator block, which indicates that the input-to-output sampling frequency ratio has been determined. the ready signal can be used as a flag or indicator output. the ready signal can also be connected to the active high mute input (pin 14) to provide an auto-mute function, so that the output port is muted when the rate estimator is in transition. applications information this section of the data sheet provides practical applications information for hardware and systems engineers who will be designing the SRC4190 into their end equipment. recommended circuit configuration the typical connection diagram for the SRC4190 is shown in figure 8. recommended values for power supply bypass capacitors are included. these capacitors should be placed as close to the ic package as possible. lgrp rcki nc sdin bcki lrcki v io dgnd bypas ifmt0 ifmt1 ifmt2 rst mute 1 2 3 4 5 6 7 8 9 10 11 12 13 14 SRC4190 audio input device reference clock from/to control logic v dd = +3.3v 10 f mode2 mode1 mode0 bcko lrcko sdout v dd dgnd tdmi ofmt0 ofmt1 owl0 owl1 rdy 28 27 26 25 24 23 22 21 20 19 18 17 16 15 audio output device 0.1 f to pin 22 to pin 21 v io = +1.65v to v dd 0.1 f 10 f to pin 7 to pin 8 from control logic figure 8. typical connection diagram for the SRC4190.
SRC4190 sbfs023a 20 www.ti.com interfacing to digital audio receivers and transmitters the SRC4190 input and output ports are designed to inter- face to a variety of audio devices, including receivers and transmitters commonly used for aes/ebu, s/pdif, and cp1201 communications. texas instruments manufactures the dir1703 digital audio interface receiver and dit4096/4192 digital audio transmit- ters to address these applications. figure 9 illustrates interfacing the dir1703 to the SRC4190 input port. the dir1703 operates from a single +3.3v sup- ply, which requires the v io supply (pin 7) for the SRC4190 to be set to +3.3v for interface compatibility. like the SRC4190 output port, the dit4096 and dit4192 audio serial port may be configured as a master or slave. in cases where the SRC4190 output port is set to master mode, it is recommended to use the reference clock source (rcki) as the master clock source (mclk) for the dit4096/4192, to ensure that the transmitter is synchronized to the SRC4190 output port data. tdm applications the SRC4190 supports a tdm output mode, which allows multiple devices to be daisy-chained together to create a serial frame. each device occupies one sub-frame within a frame, and each sub-frame carries two channels (left fol- lowed by right). each sub-frame is 64 bits long, with 32 bits allotted for each channel. the audio data for each channel is left justified within the allotted 32 bits. figure 11 illustrates the tdm frame format, while figure 12 shows the tdm input timing parameters, which are listed in the electrical charac- teristics table of this data sheet. dir1703 lrcko bcko data scko lrcki bcki sdin SRC4190 rcli clock select assumes v io = +3.3v for SRC4190 clock generator rcv din aes3, s/pdif input figure 9. interfacing the SRC4190 to the dir1703 digital audio interface receiver. figure 10 shows the interface between the SRC4190 output port and the dit4096 or dit4192 audio serial port. once again, the v io supplies for both the SRC4190 and dit4096/4192 are set to +3.3v for compatibility. SRC4190 lrcko bcko sdout rcki sync sclk sdata dit4096, dit4192 mclk clock select assumes v io = +3.3v for SRC4190 and dit4096, dit4192 ref clock generator dit clock generator tx+ tx aes3, s/pdif output figure 10. interfacing the SRC4190 to the dit4096/4192 digital audio interface transmitter. lrcko bcko sdout n = number of daisy-chained devices one sub-frame contains 64 bits, with 32 bits per channel. for each channel, the audio data is left justified, msb first format, with the word length determined by the owl[1:0] pins/bits . left right sub-frame 1 sub-frame 2 sub-frame n one frame = 1/f s left right left right figure 11. tdm frame format.
SRC4190 sbfs023a 21 www.ti.com the frame rate is equal to the output sampling frequency, f s . the bcko frequency for the tdm interface is n x 64f s , where n is the number of devices included in the daisy chain. for master mode, the output bcko frequency is fixed to the reference clock (rcki) input frequency. the number of t lros t tdms t lroh t tdmh lrcko bcko tdmi figure 12. input timing for tdm mode. devices that can be daisy-chained in tdm mode is depen- dent upon the output sampling frequency and the bcko frequency, leading to the following numerical relationship: number of daisy-chained devices = (f bcko / f s ) / 64 where: f bcko = output port bit clock (bcko), 27.136 mhz maximum f s = output port sampling (or lrcko) frequency, 212khz maximum. this relationship holds true for both slave and master modes. figures 13 and 14 show typical connection schemes for the tdm mode. although the tms320c671x dsp family is shown as the audio processing engine in these figures, other ti digital signal processors with a multi-channel buffered serial port (mcbsp tm ) may also function with this arrange- ment. interfacing to processors from other manufacturers is also possible. refer to figure 7 in this data sheet, along with the equivalent serial port timing diagrams shown in the dsp data sheet, to determine compatibility. tdmi SRC4190 slave #n sdout lrcko bcko rcki tdmi SRC4190 slave #2 sdout lrcko bcko rcki tdmi SRC4190 slave #1 sdout lrcko bcko rcki drn fsrn clkrn clkin or clksn tms320c671x mcbsp clock generator n = 0 or 1 tdmi SRC4190 master sdout lrcko bcko rcki tdmi SRC4190 slave #2 sdout lrcko bcko rcki tdmi SRC4190 slave #1 sdout lrcko bcko rcki drn fsrn clkrn clkin or clksn tms320c671x mcbsp clock generator n = 0 or 1 figure 13. tdm interface where all devices are slaves. figure 14. tdm interface where one device is master to multiple slaves.
SRC4190 sbfs023a 22 www.ti.com pin compatibility with the analog devices ad1895 and ad1896 the SRC4190 is pin-and function-compatible with the ad1895 and ad1896 when observing the guidelines indicated in the following paragraphs. power supplies. to ensure compatibility, the vdd_io and vdd_core supplies of the ad1895 and ad1896 must be set to +3.3v, while the v io and v dd supplies of the SRC4190 must be set to +3.3v. pin 1 connection . for the ad1895, pin 1 is a no connect (n.c.) pin. for the SRC4190, pin 1 functions as the low group delay selection input, and should not be left unconnected. pin 1 must be connected to either digital ground or the v io supply, dependent upon the desired group delay. crystal oscillator. the SRC4190 does not have an on-chip crystal oscillator. an external reference clock is required at the rcki input (pin 2). reference clock frequency. the reference clock input frequency for the SRC4190 must be no higher than 30 mhz, in order to match the master clock frequency specification of the ad1895 and ad1896. in addition, the SRC4190 does not support the 768f s reference clock rate. master mode maximum sampling frequency. when the input or output ports are set to master mode, the maximum sampling frequency must be limited to 96khz in order to support the ad1895 and ad1896 specification. this is de- spite the fact that the SRC4190 supports a maximum sam- pling frequency of 212khz in master mode. the user should consider building an option into his or her design to support the higher sampling frequency of the SRC4190. matched phase mode. due to the internal architecture of the SRC4190, it does not require or support the matched phase mode of the ad1896. given multiple SRC4190 de- vices, if all reference clock (rcki) inputs are driven from the same clock source, the devices will be phase matched.
packaging information orderable device status (1) package type package drawing pins package qty eco plan (2) lead/ball finish msl peak temp (3) SRC4190idb active ssop db 28 50 pb-free (rohs) cu nipdau level-2-260c-1year/ level-1-220c-unlim SRC4190idbr active ssop db 28 2000 pb-free (rohs) cu nipdau level-2-260c-1year/ level-1-220c-unlim (1) the marketing status values are defined as follows: active: product device recommended for new designs. lifebuy: ti has announced that the device will be discontinued, and a lifetime-buy period is in effect. nrnd: not recommended for new designs. device is in production to support existing customers, but ti does not recommend using this part in a new design. preview: device has been announced but is not in production. samples may or may not be available. obsolete: ti has discontinued the production of the device. (2) eco plan - may not be currently available - please check http://www.ti.com/productcontent for the latest availability information and additional product content details. none: not yet available lead (pb-free). pb-free (rohs): ti's terms "lead-free" or "pb-free" mean semiconductor products that are compatible with the current rohs requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. where designed to be soldered at high temperatures, ti pb-free products are suitable for use in specified lead-free processes. green (rohs & no sb/br): ti defines "green" to mean "pb-free" and in addition, uses package materials that do not contain halogens, including bromine (br) or antimony (sb) above 0.1% of total product weight. (3) msl, peak temp. -- the moisture sensitivity level rating according to the jedecindustry standard classifications, and peak solder temperature. important information and disclaimer: the information provided on this page represents ti's knowledge and belief as of the date that it is provided. ti bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. efforts are underway to better integrate information from third parties. ti has taken and continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. ti and ti suppliers consider certain information to be proprietary, and thus cas numbers and other limited information may not be available for release. in no event shall ti's liability arising out of such information exceed the total purchase price of the ti part(s) at issue in this document sold by ti to customer on an annual basis. package option addendum www.ti.com 9-dec-2004 addendum-page 1
mechanical data msso002e ? january 1995 ? revised december 2001 post office box 655303 ? dallas, texas 75265 db (r-pdso-g**) plastic small-outline 4040065 /e 12/01 28 pins shown gage plane 8,20 7,40 0,55 0,95 0,25 38 12,90 12,30 28 10,50 24 8,50 seating plane 9,90 7,90 30 10,50 9,90 0,38 5,60 5,00 15 0,22 14 a 28 1 20 16 6,50 6,50 14 0,05 min 5,90 5,90 dim a max a min pins ** 2,00 max 6,90 7,50 0,65 m 0,15 0 ? 8 0,10 0,09 0,25 notes: a. all linear dimensions are in millimeters. b. this drawing is subject to change without notice. c. body dimensions do not include mold flash or protrusion not to exceed 0,15. d. falls within jedec mo-150
important notice texas instruments incorporated and its subsidiaries (ti) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. all products are sold subject to ti?s terms and conditions of sale supplied at the time of order acknowledgment. ti warrants performance of its hardware products to the specifications applicable at the time of sale in accordance with ti?s standard warranty. testing and other quality control techniques are used to the extent ti deems necessary to support this warranty. except where mandated by government requirements, testing of all parameters of each product is not necessarily performed. ti assumes no liability for applications assistance or customer product design. customers are responsible for their products and applications using ti components. to minimize the risks associated with customer products and applications, customers should provide adequate design and operating safeguards. ti does not warrant or represent that any license, either express or implied, is granted under any ti patent right, copyright, mask work right, or other ti intellectual property right relating to any combination, machine, or process in which ti products or services are used. information published by ti regarding third-party products or services does not constitute a license from ti to use such products or services or a warranty or endorsement thereof. use of such information may require a license from a third party under the patents or other intellectual property of the third party, or a license from ti under the patents or other intellectual property of ti. reproduction of information in ti data books or data sheets is permissible only if reproduction is without alteration and is accompanied by all associated warranties, conditions, limitations, and notices. reproduction of this information with alteration is an unfair and deceptive business practice. ti is not responsible or liable for such altered documentation. resale of ti products or services with statements different from or beyond the parameters stated by ti for that product or service voids all express and any implied warranties for the associated ti product or service and is an unfair and deceptive business practice. ti is not responsible or liable for any such statements. following are urls where you can obtain information on other texas instruments products and application solutions: products applications amplifiers amplifier.ti.com audio www.ti.com/audio data converters dataconverter.ti.com automotive www.ti.com/automotive dsp dsp.ti.com broadband www.ti.com/broadband interface interface.ti.com digital control www.ti.com/digitalcontrol logic logic.ti.com military www.ti.com/military power mgmt power.ti.com optical networking www.ti.com/opticalnetwork microcontrollers microcontroller.ti.com security www.ti.com/security telephony www.ti.com/telephony video & imaging www.ti.com/video wireless www.ti.com/wireless mailing address: texas instruments post office box 655303 dallas, texas 75265 copyright ? 2004, texas instruments incorporated

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