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SM5842AP/APT
NIPPON PRECISION CIRCUITS INC.
High-Class Audio Multi-function Digital Filter
OVERVIEW
The SM5842AP/APT is a multi-function digital filter IC, fabricated using NPC's Molybdenum-gate CMOS process, for digital audio reproduction equipment. It features 8-times oversampling (interpolation), independent left and right-channel digital deemphasis, and soft muting functions. It accepts 16, 18, 20 or 24-bit input data, and outputs data in 18, 20, 22 or 24-bit format. It operates using either a 384fs or 256fs system clock at sampling frequencies up to 48 kHz + 10% (384fs SM5842AP, 384/256fs SM5842APT).
s s s s s
* 256fs - 13 MHz maximum frequency (at maximum fs = 50.7 kHz, SM5842AP) - 14.2 MHz maximum frequency (at maximum fs = 55.2 kHz, SM5842APT) Crystal oscillator circuit built-in TTL-compatible input/outputs 5.0 0.25 V supply Molybdenum-gate CMOS process 28-pin plastic DIP
Filter Configuration
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FEATURES
Functions
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s
s
s
s
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L/R 2-channel processing 8-times oversampling (interpolation) * 0.00002 dB passband ripple * 117 dB stopband attenuation Digital deemphasis * 32/44.1/48 kHz sampling frequency (fs) * 2-channel independent ON/OFF control Soft muting * 2-channel independent ON/OFF control Input data format * 2s complement, MSB first - LR alternating, 16/18/20/24-bit serial, trailing data - LR alternating, 24-bit serial, leading data - LR simultaneous, 24-bit serial, leading data Output data format * 2s complement, MSB first, LR simultaneous * 18/20/22/24-bit serial * BCKO burst (NPC format) Dither round-up processing * ON (dither rounding)/OFF (normal rounding) control 25-bit internal data length Jitter-free function for correct operation in the presence of jitter between the system clock and LRCI clock * ON (jitter-free mode)/OFF (sync mode) control 256fs/384fs system clock selectable * 384fs - 21.2 MHz maximum frequency (at maximum fs = 55.2 kHz)
s
s
Linear phase 3-stage FIR interpolation filter * 169-tap 1st stage (fs to 2fs) * 29-tap 2nd stage (2fs to 4fs) * 17-tap 3rd stage (4fs to 8fs) Deemphasis filter - IIR filter configuration for accurate gain and phase characteristics 26 x 24-bit parallel multiplier/32-bit accumulator for high precision Overflow limiter built-in
APPLICATIONS
s s s
CD players DAT players PCM systems
PINOUT
DI / INF2N BCKI CKSLN INF1N IW1N / DIL XTI XTO VSS CKO IW2N / DIR OW1N OW2N SYNCN RSTN
1
28
LRCI DG BCKO WCKO DOL DOR VDD DITHN MUTEL MUTER FSEL2 FSEL1 DEMPL
SM5842AP/APT
14 15
DEMPR
NIPPON PRECISION CIRCUITS--1
SM5842AP/APT
PACKAGE DIMENSIONS
Unit: mm
28-pin plastic DIP
0 to 15 13.8 0.2 + 0.3 1.5 -0.05 3.8 0.1
BLOCK DIAGRAM
CKSLN LRCI DI / INF2N BCKI IW1N / DIL IW2N / DIR
XTI XTO CKO
System Clock
3.2 0.2 7.7 0.5
2.54
0.45 0.1
4.5 0.3
+ 0.25- 0.10 0.05
37.3 0.3
15.2
Input Data Interface
INF1N
RSTN SYNCN
Timing Controller
Filter and Attenuation Arithmetic block
DITHN
DEMPL DEMPR FSEL1 FSEL2 Deemphasis Control Output Data Interface OW2N MUTEL MUTER Mute Control OW1N
VSS VDD
BCKO WCKO DOL DOR
DG
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SM5842AP/APT
PIN DESCRIPTION
Number 1 2 3 Name DI/INF2N BCKI CKSLN I/O1 Ip Ip Ip Description Data input when INF1N is LOW, and input format select pin 2 when INF1N is HIGH. Input bit clock Oscillator and system clock select input. 384fs when HIGH, and 256fs when LOW. Input format select pin 1. INF1N and INF2N select the pin functions below. Pin function selection INF1N LOW LOW HIGH HIGH DI/INF2N LOW LR alternating, trailing data HIGH LOW HIGH LR alternating, leading data INF2N LR simultaneous, leading data DIL DIR DI IW1N IW2N Input format DI/INF2N 4 INF1N Ip IW1N/DIL IW2N/DIR
Input bit length select pin 1 when INF1N is LOW, and left-channel data input when INF1N is HIGH. IW1N and IW2N select the input data length. INF1N IW2N/DIL LOW 5 IW1N/DIL Ip LOW HIGH HIGH HIGH 6 7 8 9 10 XTI XTO VSS CKO IW2N/DIR I O - O Ip Oscillator input connection Oscillator output connection Ground Oscillator output clock. Same frequency as XTI. Input bit length select pin 2 when INF2N is LOW, and right-channel data input when INF2N is HIGH. IW1N and IW2N select the input data length as shown in the table for pin 5. Output length select bits. 11 OW1N Ip OW2N LOW LOW 12 OW2N Ip HIGH HIGH 13 14 15 16 SYNCN RSTN DEMPR DEMPR Ip Ip Ip Ip OW1N LOW HIGH LOW HIGH Output bit length 24 bits 22 bits 20 bits 18 bits x LOW HIGH x 18 bits 16 bits 24 bits LOW IW1N/DIR LOW HIGH Input bit length 24 bits 20 bits
Sync mode select pin. Normal sync mode when LOW, and jitter-free mode when HIGH. System reset. Reset operation when LOW, and normal operation when HIGH. Right-channel deemphasis control signal. OFF when LOW, and ON when HIGH. Left-channel deemphasis control signal. OFF when LOW, and ON when HIGH. Deemphasis filter select inputs
17
FSEL1
Ip
FSEL1 LOW LOW
FSEL2 LOW HIGH LOW HIGH
Sampling frequency (fs) 44.1 kHz 48 kHz Invalid setting 32 kHz
18
FSEL2
Ip
HIGH HIGH
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SM5842AP/APT
Number 19 20 21 22 23 24 25 26 27 28 Name MUTER MUTEL DITHN VDD DOR DOL WCKO BCKO DG LRCI I/O1 Ip Ip Ip - O O O O O Ip Description Right-channel mute signal. Muting when HIGH, and normal output when LOW. Left-channel mute signal. Muting when HIGH, and normal output when LOW. Dither processing control. ON when LOW, and OFF when HIGH. 5 V supply Right-channel data output Left-channel data output Output word clock Output bit clock Deglitched output Input data sample rate (fs) clock
1. I = input, Ip = Input with pull-up resistor, O = output
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SM5842AP/APT
SPECIFICATIONS
Absolute Maximum Ratings
VSS = 0 V
Parameter Supply voltage range Input voltage range Storage temperature range Power dissipation Soldering temperature Soldering time Symbol VDD VIN Tstg PD Tsld tsld Rating -0.3 to 7.0 -0.3 to VDD + 0.3 -40 to 125 550 255 10 Unit V V C mW C s
Recommended Operating Conditions
VSS = 0 V
Parameter Supply voltage range Operating temperature range Symbol VDD SM5842AP Topr SM5842APT Condition Rating 4.75 to 5.25 -20 to 80 -20 to 70 Unit V C
DC Electrical Characteristics
VDD = 4.75 to 5.25 V, VSS = 0 V, Ta = -20 to 80 C
Rating Parameter Current consumption XTI HIGH-level input voltage XTI LOW-level input voltage HIGH-level input voltage2 LOW-level input voltage2 HIGH-level output voltage3 LOW-level output voltage3 XTO HIGH-level output voltage XTO LOW-level output voltage XTI HIGH-level input current XTI LOW-level input current LOW-level input current2 Input leakage current2 Symbol IDD VIH1 VIL1 VIH2 VIL2 VOH1 VOL1 VOH2 VOL2 ILH ILL1 ILL2 IIH IOH = -0.4 mA IOL = 1.6 mA IOH = -1.0 mA IOL = 1.0 mA VIN = VDD VIN = 0 V VIN = 0 V VIN = VDD Condition min VDD = 5.0 V1 - 0.7VDD - 2.4 - 2.5 - VDD - 0.5 - - - - - typ 60 - - - - - - - - 10 10 10 - max 80 - 0.3VDD - 0.5 - 0.4 - 0.4 20 20 20 1.0 mA V V V V V V V V A A A A Unit
1. fSYS = 256fs = 14.2 MHz (CKSLN = LOW), no output load 2. Pins DI/INF2N, BCKI, CKSLN, INF1N, IW1N/DIL, IW2N/DIR, OW1N, OW2N, SYNCN, RSTN, DEMPR, DEMPL, FSEL1, FSEL2, MUTER, MUTEL, DITHN, LRCI 3. Pins CKO, DOL, DOR, BCKO, WCKO, DG
NIPPON PRECISION CIRCUITS--5
SM5842AP/APT
AC Electrical Characteristics
Input Clock (XTI: SM5842AP)
Crystal oscillator
fs = 384fs (CKSLN = HIGH): VDD = 4.75 to 5.25 V, VSS = 0 V, Ta = -20 to 80 C
Rating Parameter Oscillator frequency Symbol min fOSC 2.0 typ - max 21.2 MHz Unit
fs = 256fs (CKSLN = LOW): VDD = 4.75 to 5.25 V, VSS = 0 V, Ta = -20 to 80 C
Rating Parameter Oscillator frequency Symbol min fOSC 1.0 typ - max 13.0 MHz Unit
External clock input
fs = 384fs (CKSLN = HIGH): VDD = 4.75 to 5.25 V, VSS = 0 V, Ta = -20 to 80 C
Rating Parameter Clock HIGH-level pulsewidth Clock LOW-level pulsewidth Clock pulse cycle time Symbol min tCWH tCWL tXI 20 20 47 typ - - - max 250 250 500 ns ns ns Unit
fs = 256fs (CKSLN = LOW): VDD = 4.75 to 5.25 V, VSS = 0 V, Ta = -20 to 80 C
Rating Parameter Clock HIGH-level pulsewidth Clock LOW-level pulsewidth Clock pulse cycle time Symbol min tCWH tCWL tXI 35 35 76 typ - - - max 500 500 1000 ns ns ns Unit
VIH1 XTI 0.5VDD VIL1
tCWH tXI
tCWL
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SM5842AP/APT Input Clock (XTI: SM5842APT)
Crystal oscillator
fs = 384fs (CKSLN = HIGH): VDD = 4.75 to 5.25 V, VSS = 0 V, Ta = -20 to 70 C
Rating Parameter Oscillator frequency Symbol min fOSC 2.0 typ - max 21.2 MHz Unit
fs = 256fs (CKSLN = LOW): VDD = 4.75 to 5.25 V, VSS = 0 V, Ta = -20 to 70 C
Rating Parameter Oscillator frequency Symbol min fOSC 1.0 typ - max 14.2 MHz Unit
External clock input
fs = 384fs (CKSLN = HIGH): VDD = 4.75 to 5.25 V, VSS = 0 V, Ta = -20 to 70 C
Rating Parameter Clock HIGH-level pulsewidth Clock LOW-level pulsewidth Clock pulse cycle time Symbol min tCWH tCWL tXI 20 20 47 typ - - - max 250 250 500 ns ns ns Unit
fs = 256fs (CKSLN = LOW): VDD = 4.75 to 5.25 V, VSS = 0 V, Ta = -20 to 70 C
Rating Parameter Clock HIGH-level pulsewidth Clock LOW-level pulsewidth Clock pulse cycle time Symbol min tCWH tCWL tXI 30 30 70 typ - - - max 500 500 1000 ns ns ns Unit
VIH1 XTI 0.5VDD VIL1
tCWH tXI
tCWL
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SM5842AP/APT
Serial input timing (BCKI, DI, DIL, DIR, LRCI)
SM5842AP: VDD = 4.75 to 5.25 V, VSS = 0 V, Ta = -20 to 80 C SM5842APT: VDD = 4.75 to 5.25 V, VSS = 0 V, Ta = -20 to 70 C
Rating Parameter BCKI HIGH-level pulsewidth BCKI LOW-level pulsewidth BCKI pulse cycle DIN setup time DIN hold time Last BCKI rising edge to LRCI edge LRCI edge to first BCKI rising edge Symbol min tBCWH tBCWL tBCY tDS tDH tBL tLB 50 50 100 50 50 50 50 typ - - - - - - - max - - - - - - - ns ns ns ns ns ns ns Unit
tBCY tBCWH
BCKI
tBCWL
1.5V
tDS
DI DIL DIR
tDH
1.5V
tBL
LRCI
tLB
1.5V
Reset timing (RSTN) SM5842AP: VDD = 4.75 to 5.25 V, VSS = 0 V, Ta = -20 to 80 C SM5842APT: VDD = 4.75 to 5.25 V, VSS = 0 V, Ta = -20 to 70 C
Rating Parameter Symbol Condition min At power-ON RST LOW-level reset pulsewidth tRST At all other times 1 50 typ - - max - - s ns Unit
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SM5842AP/APT Output timing SM5842AP: VDD = 4.75 to 5.25 V, VSS = 0 V, Ta = -20 to 80 C, CL = 15 pF SM5842APT: VDD = 4.75 to 5.25 V, VSS = 0 V, Ta = -20 to 70 C, CL = 15 pF
Rating Parameter XTI to XTO delay XTI to CKO delay XTI to BCKO delay (CKSLN = HIGH) Symbol tXTO tCKO tsbH tsbL XTI to BCKO delay (CKSLN = LOW) tsbH tsbL BCKO to DOL, DOR, WCKO delay tbdH tbdL CKO to DOL, DOR, WCKO, DG delay tcdH tcdL XTO to DOL, DOR, WCKO, DG delay txdH txdL Condition min XTI fall to XTO rise XTI fall to CKO fall XTI fall to BCKO rise XTI fall to BCKO fall XTI fall to BCKO rise XTI fall to BCKO fall BCKO fall to output rise BCKO fall to output fall CKO fall to output rise CKO fall to output fall XTO rise to output rise XTO rise to output fall 3 10 20 20 20 20 -5 -5 12 12 15 15 typ - - - - - - - - - - - - max 15 35 65 ns 65 65 ns 65 10 ns 10 45 ns 45 50 ns 50 ns ns Unit
Tsys
Tsys
XTI (CKSLN = H) Tsys XTI (CKSLN = L)
VDD / 2
VDD / 2
CXO (CKSLN = H)
1.5V
tCKO
CKO (CKSLN = L) 1.5V
tsbH
BCKO
tsbL
1.5V
tcdL tbdL
1.5V DOL DOR DG WCKO
tcdH tbdH
1.5V
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SM5842AP/APT
Filter Characteristics
8-times interpolation filter
Parameter Passband Stopband Passband ripple Stopband attenuation Group delay Rating 0 to 0.4535fs 0.5465fs to 7.4535fs 0.00002 dB 117 dB Fixed
8fs filter response with deemphasis OFF
0
Attenuation (dB)
20
40
60
80
100
120
140 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0
Frequency (xfs)
8fs filter passband response with deemphasis OFF
-0.00008
Attenuation (dB)
-0.00004 0.00000 0.00004
0.00008 0.000 0.125 0.250 0.375 0.500
Frequency (xfs)
8fs filter transition response with deemphasis OFF
0
20
Attenuation (dB)
40
60
80
100
120
140 0.440
0.465
0.490
0.515
0.540
0.565
0.590
0.615
0.640
Frequency (xFs)
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SM5842AP/APT Deemphasis filter
Sampling frequency (fs) Parameter 32 kHz Passband bandwidth (kHz) Attenuation Deviation from ideal characteristic Phase, 0 to 14.5 44.1 kHz 0 to 20.0 0.001 dB 0 to 1.5 48 kHz 0 to 21.7
Passband response with deemphasis ON (logarithmic frequency axis)
0
0
Attenuation (dB)
2
32kHz Phase
4
-40
6
-60
8
10
32kHz 44.1kHz 48kHz
10 20 50 100 200 500 1k 2k 5k 10k 20k [Hz]
Frequency (Hz)
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Phase (degrees)
44.1kHz 48kHz
-20
SM5842AP/APT
FUNCTIONAL DESCRIPTION
The basic arithmetic block is shown in figure 1, and the function of each block is described in the following sections.
Input fs 2-times interpolator 1st FIR, 169-tap
2fs 2-times interpolator 2nd FIR, 29-tap 4fs
Deemphasis IIR filter Deemphasis OFF Deemphasis ON
4fs Soft mute 4fs 2-times interpolator 3rd FIR, 17-tap 8fs Output
Figure 1. Arithmetic block diagram
8-times Oversampling (Interpolation)
The interpolation arithmetic block is comprised of 3 cascaded, 2-times FIR interpolation filters, as shown in figure 1. The input signal is sampled at rate fs, and then 8times oversampling data is output. Sampling noise in the 0.5465fs to 7.4535fs stopband is removed by the interpolation filter.
DEMPL/DEMPR is HIGH, DEMPL/DEMPR is LOW.
and
OFF
when
Table 1. Sampling frequency select
FSEL1 LOW LOW HIGH FSEL2 LOW HIGH LOW HIGH Sampling frequency (fs) 44.1 kHz 48 kHz Invalid setting 32 kHz
Digital Deemphasis
The digital deemphasis filter has the same construction as analog filters. It is implemented as an IIR filter to faithfully reproduce the gain and phase characteristics of standard analog deemphasis filters. The three sets of filter coefficients for the three fs = 32.0/44.1/48.0 kHz sampling frequencies are selected by FSEL1 and FSEL2 when the sampling frequency is specified, as shown in table 1. Independent deemphasis for the left and right channel is controlled independently by DEMPL and DEMPR, respectively. Digital deemphasis is ON when
HIGH
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SM5842AP/APT
Soft Muting
Muting of the left and right channel is controlled independently by MUTEL and MUTER, respectively. Muting is ON when MUTEL/MUTER is HIGH, muting is OFF when MUTEL/MUTER is LOW. When MUTEL/MUTER goes HIGH, the attenuation changes smoothly from 0 to - dB in 512/fs, or
approximately 11.6 ms when fs = 44.1 kHz. When MUTEL/MUTER goes LOW, muting is released and the attenuation changes smoothly from - to 0 dB, again taking approximately 11.6 ms. When RSTN goes LOW, the DOL and DOR outputs go LOW, immediately muting the output signal. Muting is released and timing is synchronized when RSTN goes HIGH.
System Clock (XTI, XTO, CKO, CKSLN)
Two system clock frequencies, 384fs and 256fs, can be used. An external clock source can be input on XTI, or a crystal oscillator can be constructed by connecting a crystal between XTI and XTO. The system clock is also buffered and then output on CKO. The system clock frequency selection and the internal clock frequency are shown in table 2.
Table 2. System clock frequency select
CKSLN Parameter HIGH XTI input clock frequency (fXI = 1/tXI) CKO clock frequency Internal clock frequency (tSYS) 384fs 384fs 2 x tXI LOW 256fs 256fs tXI
To timing controller CKSLN XTI 1/2 Internal system clock (192fs or 256fs) XTO CKO
Figure 2. Clock generator circuit
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SM5842AP/APT
Audio Data Input (INF1N, INF2N, IW1N, IW2N, DI, DIL, DIR, BCKI, LRCI)
The input data format and several input pin functions are selected by the state of INF1N and INF2N as shown in table 3.
Table 3. Pin function select
Pin function selection INF1N LOW LOW HIGH HIGH DI/INF2N LOW HIGH LOW HIGH LR alternating, leading data LR simultaneous2, leading data INF2N DIL DIR Input format DI/INF2N LR alternating1, trailing data DI IW1N/DIL IW1N IW2N/DIR IW2N
1. Alternating left-channel and right-channel data input on a single input DI. 2. Simultaneous left-channel and right-channel data input on two inputs, DIL and DIR, respectively.
The input data word length is selected by the state of IW1N and IW2N when INF1N is LOW. 24-bit is selected when INF1N is HIGH.
Table 4. Input word length
INF1N IW2N/DIL LOW LOW LOW HIGH HIGH HIGH x LOW HIGH x 18 bits 16 bits 24 bits IW1N/DIR LOW HIGH Input word length 24 bits 22 bits
resynchronized and all functions continue to operate normally. Sync mode (SYNCN = LOW) When SYNCN is LOW, the timing error value is 1 x (system clock period), which is a much smaller timing error tolerance than in jitter-free mode. In this mode, the internal timing is guaranteed to follow the LRCI clock timing within this tolerance, making this mode useful for systems constructed from a multiple number of SM5842AP/APT devices. Note that resynchronization affects the internal operation and can generate a momentary click noise output.
Jitter-free Function (SYNCN)
The arithmetic circuit and output control timing is derived from the system clock, and is therefore independent of the input LRCI and BCKI clocks. Accordingly, any jitter in the data input clock (LRCI and BCKI) does not cause jitter in the output. Generally, the internal timing is synchronized to the LRCI input timing after a system reset release, when RSTN goes from LOW to HIGH, on the first LRCI clock start edge. If the input timing and LRCI start edge timing subsequently drift, the input timing is automatically resynchronized when the timing error exceeds a certain value. There are 2 timing error values at which resynchronization occurs, selected by the state of SYNCN. Jitter-free mode (SYNCN = HIGH) When SYNCN is HIGH, the timing error value is 3/8 x (LRCI clock period). When the difference between the input timing and LRCI start edge position do not exceed this value, internal timing is not
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SM5842AP/APT
Audio Data Output (DOL, DOR, BCKO, WCKO, OW20N)
The output data is in serial, simultaneous left and right-channel, 2s complement, MSB first, BCKO burst (NPC format) format. The output data word length is selected by the state of OW1N and OW2N as shown in table 5.
Table 5. Output word length select
OW1N LOW LOW HIGH HIGH OW2N LOW HIGH LOW HIGH Output word length 24 bits 22 bits 20 bits 18 bits
8fs serial data is output in sync with the falling edge of the internal system clock and BCKO clock. The output timing is determined by CKSLN and the output word length. When CKSLN is LOW, the output timing is the same for different output word lengths. Only the number of BCKO bit clock pulses word changes depending on the output word length selected. When CKSLN is HIGH, however, the output timing for 24-bit output mode starts 1 bit earlier than for 18/20/22-bit output mode.
Table 6. Output timing
Parameter Bit clock rate Data word length Symbol tB tDW CKSLN = HIGH 1/192fs 24tSYS CKSLN = LOW 1/256fs 32tSYS
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SM5842AP/APT
System Reset (RSTN)
Under normal operating conditions, the SM5842AP/APT does not need to be reset. However, it can be reset when you want to synchronize the LRCI clock and internal operation timing in jitterfree mode. The system is reset by applying a LOW-level pulse on RSTN. The arithmetic and output timing counters are reset on the first LRCI start edge after reset is released, as long as the XTI clock has already stabilized. The LRCI start edge is determined by the state of INF1N and INF2N. When INF1N is LOW or when both INF1N and INF2N are HIGH, the start edge is the rising edge. When INF1N is HIGH and INF2N is LOW, the start edge is the falling edge. When RSTN is LOW, the DOL and DOR outputs are LOW, muting the output signal to an attenuation level of -. The power-ON reset pulse can be applied by a microcontroller or, for systems where XTI and LRCI are stable at power-ON, by connecting a capacitor of about 300 pF between RSTN and VSS. For systems that do not use a microcontroller, the capacitor must be chosen such that the XTI and LRCI clocks fully stabilize before RSTN goes from LOW to HIGH.
RSTN
1 2
LRCI Internal reset WCKO DOL DOR Figure 3. System reset timing and output muting
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SM5842AP/APT
TIMING DIAGRAMS
Input Timing Examples (DIN, BCKI, LRCI)
1 / fs Lch DATA (MSB) DI 1 2 (LSB) 14 15 16 (MSB) 1 2 Rch DATA (LSB) 14 15 16
BCKI LRCI
INF1N = LOW, IW1N = IW2N = HIGH
Figure 4. LR alternating, trailing data, 16-bit input
1 / fs Lch DATA (MSB) DIL 1 2 3 (LSB) 23 24 Rch DATA (MSB) DIR BCKI LRCI
INF1N HIGH, INF2N = LOW. Data following LSB is ignored. Requires minimum 24 BCKI clock pulses.
1
(LSB) 3 23 24
1
2
Figure 5. LR alternating, leading data, 24-bit input
1 / fs (MSB) DIL 1 2 3 Lch DATA 4 5 6 (LSB) 23 24 (LSB) 23 24 1 1
(MSB) DIR 1 2 3
Rch DATA 4 5 6
BCKI LRCI
INF1N = INF2N = HIGH. Data following LSB is ignored. Requires minimum 24 BCKI clock pulses.
Figure 6. LR simultaneous, leading data, 20-bit input
NIPPON PRECISION CIRCUITS--17
SM5842AP/APT
Output Timing Examples (DOL, DOR, BCKO, WCKO, DG)
24TB(TDW) System Clock DOL or DOR BCKO TB WCKO 12TB DG 10TB
The number of output bits is determined by the output bit length selected.
1
2
3
4
16
17
18 19 20 21 22 (*)
1
2
TB
12TB
12TB
2TB
Figure 7. 18/20/22-bit output (CKSLN = HIGH)
24TB(TDW) System Clock DOL or DOR BCKO TB WCKO 12TB DG 10TB
The number of output bits is determined by the output bit length selected.
24
1
2
3
4
............................. ........................
21 22 23 24
1
2
3
12TB
12TB
2TB
Figure 8. 24-bit output (CKSLN = HIGH)
32TB(TDW) System Clock DOL or DOR BCKO TB WCKO 16TB DG 14TB
The number of output bits is determined by the output bit length selected.
1
2
3
17 18 19
......
24 (*)
1
2
TB
16TB
16TB
2TB
Figure 9. 24-bit output (CKSLN = LOW)
NIPPON PRECISION CIRCUITS--18
SM5842AP/APT
Data Input to Output Delay Timing
This is the digital filter arithmetic computation time from the completion of data input at rate fs (tINPUT) on the rising edge of LRCI to the start of data output at rate 8fs (tOUTPUT) on the falling edge of WCKO.
Table 7. Output delay
CKSLN LOW (256fs) HIGH LOW HIGH (384fs) HIGH Jitter-free mode Jitter-free mode After reset + sync mode SYNCN LOW Mode After reset + sync mode tOUTPUT - tINPUT 48.625/fs 48.25/fs - 49.0/fs 48.75/fs 48.375/fs - 49.125/fs
1/fs LRCI
Serial data Input
tINPUT
WCKO (256fs) WCKO (384fs)
48/fs
tOUTPUT
Serial data output
tOUTPUT
Figure 10. Delay timing 1
Serial data output
tINPUT
tOUTPUT - tINPUT
tOUTPUT
Figure 11. Delay timing 2
NIPPON PRECISION CIRCUITS--19
SM5842AP/APT
APPLICATION CIRCUITS
Input Interface Circuits
CD decoder (CXD2500Q) connection
(SONY)
CD DECODER CXD2500Q PSSL
C16M LRCK DA16 DA15 EMPH
16.9344MHz 44.1kHz 2.1168MHz
XTI LRCI DI
CKSLN
SM5842 BCKI DEMPL MUTEL DEMPR
IW1N IW2N INF1N MUTER FSEL1 FSEL2
MUTE
X'tal(16.9344MHz)
(SONY)
CD DECODER CXD2500Q PSSL XTSL XTAI LRCK DA16 DA15 EMPH
16.9344MHz 44.1kHz 2.1168MHz
CKSLN CKI LRCI DI BCKI DEMPL DEMPR IW1N IW2N INF1N
XTI
XTO
SM5842
MUTEL MUTER FSEL1 FSEL2 MUTE
Digital audio interface receiver (YM3623B) connection
(YAMAHA)
DIR YM3623B S1 S2
A L/R DO BCO DEF
384fs (16.9344MHz) fs (44.1kHz)
XTI LRCI DI BCKI DEMPL DEMPR IW1N IW2N INF1N
CKSLN
SM5842
MUTEL MUTER FSEL1 FSEL2 MUTE
NIPPON PRECISION CIRCUITS--20
SM5842AP/APT
Output Interface Circuits
20-bit input DAC (SM5864AP) connection 1
384fs
X'tal 384fs to SIGNAL PROCESSOR (CD DECODER) 384fs
74HCU04
CKSLN CKO XTI BCKO WCKO DOL DOR
XDIVN
XTI
SM5842
(20bit OUT)
384fs CKO NPC LOA BCKI DAC LOBN 8fs WCKI SM5864 DINL (DECO) ROA DINR ROBN COMPN X3SL
Analog LPF Analog LPF
Lch OUT
Rch OUT
OW2N OW1N
512fs
X'tal 512fs to SIGNAL PROCESSOR (CD DECODER) 256fs
74HCU04
CKSLN CKO
SM5842
(20bit OUT)
256fs XTI 1/2 BCKO 8fs WCKO DOL DOR
XDIVN CKO NPC BCKI
XTI LOA
DAC LOBN WCKI SM5864 DINL (DECO) ROA
DINR
Analog LPF Analog LPF
Lch OUT
ROBN OW2N OW1N COMPN X3SL
Rch OUT
NIPPON PRECISION CIRCUITS--21
SM5842AP/APT 20-bit input DAC (SM5864AP) connection 2
L/R-channel independent complementary PWM output
to SIGNAL PROCESSOR (CD DECODER) 384fs
CKSLN CKO XTI BCKO WCKO DOL DOR 384fs 8fs
XDIVN CKO BCKI LOA
SM5842
(20bit OUT)
LOBN WCKI SM5864 ROA DINL DINR
DAC
(DECO)
Analog LPF
Lch OUT
ROBN
OW2N OW1N
X3SL COMPN
74HCU04 X'tal 384fs XDIVN XTI
BCKI LOA WCKI DAC LOBN DINL SM5864 (DECO) ROA DINR ROBN X3SL COMPN
Analog LPF
Rch OUT
20-bit input R - 2R DAC (PCM63P) connection
L/R-channel independent
(BURR - BROWN) PCM63P
BCKO WCKO SM5842 DOL (20bit OUT) DOR OW2N OW1N 8fs CLOCK LE DATA
BPO Iout
Analog LPF
Lch OUT
(BURR - BROWN) PCM63P
CLOCK L. E DATA
BPO Iout
Analog LPF
Rch OUT
NIPPON PRECISION CIRCUITS--22
SM5842AP/APT
NIPPON PRECISION CIRCUITS INC. reserves the right to make changes to the products described in this data sheet in order to improve the design or performance and to supply the best possible products. Nippon Precision Circuits Inc. assumes no responsibility for the use of any circuits shown in this data sheet, conveys no license under any patent or other rights, and makes no claim that the circuits are free from patent infringement. Applications for any devices shown in this data sheet are for illustration only and Nippon Precision Circuits Inc. makes no claim or warranty that such applications will be suitable for the use specified without further testing or modification. The products described in this data sheet are not intended to use for the apparatus which influence human lives due to the failure or malfunction of the products. Customers are requested to comply with applicable laws and regulations in effect now and hereinafter, including compliance with export controls on the distribution or dissemination of the products. Customers shall not export, directly or indirectly, any products without first obtaining required licenses and approvals from appropriate government agencies. NIPPON PRECISION CIRCUITS INC. 4-3, Fukuzumi 2-chome Koto-ku, Tokyo 135-8430, Japan Telephone: 03-3642-6661 Facsimile: 03-3642-6698 NC9714AE 1998.2
NIPPON PRECISION CIRCUITS INC.
NIPPON PRECISION CIRCUITS--23

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