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1/16 www.rohm.com 2010.09 - rev. a ? 2010 rohm co., ltd. all rights reserved. audio accessory ics for mobile devices voice/audio mixer & selector ic bu7831kn description bu7831kn is the sound path selector which in clude 3 stereo inputs, stereo headphone amp, 600 driver amp, and 2stereooutputs. each output have a mixer and an attenuator, you can set the variable audio path setting. the variable audio source can connect to headphone and speaker through this lsi. feature 1) it has 3stereo inputs. 2) it has analog mixer on each input. 3) it matches for the application used the headphone because it has 16 ? audio driver. 4) 16 driver has the pop-noise less function. 5) the attenuator of 16 ? driver has soft changing and muting function. 6) it has 600 ? driver for external output. 7) it included stereo output for stereo speaker. 8) vqfn20 small package applications it is for portable equipments with audio player. absolute maximum ratings parameter symbol ratings unit supply voltage vdd -0.3 4.5 v power dissipation pd 530 *1 mw operating temperature range topr -30 +85 storage temperature range tstg -55 +125 *1 reduce by 5.3 mw/ over 25 recommended operating range parameter symbol ratings unit min. typ. max. supply voltage vdd 2.5 3.0 3.3 v no.10087eat02
technical note 2/16 www.rohm.com 2010.09 - rev. a ? 2010 rohm co., ltd. all rights reserved. bu7831kn electric characteristics unless otherwise specified, ta=25 ,avdd=dvdd=3.0v ? analog part parameter symbol limits unit conditions min. typ. max. stand-by current istb - - 3 a stand-by mode operation current 1 idd1 - 0.26 0.42 ma bias part. no signal operation current 2 idd2 - 2.3 3.7 ma st1r, st1l to hpr, hpl exclude idd1, no signal total harmonic distortion 1 (hpl, hpr) thdhp1 - 0.05 0.5 % vo=-10dbv, 20khzl pf output power 1(hpl, hpr) po1 - 10 - mw thd=10%, rl=16 output noise voltage 1 (hpl, hpr) v no - -94 -80 dbv jis a weighting maximum output level 1 (spl, spr) vo max1 2.0 - - vp-p thd Q 1%, rl=10k maximum output level 2 (exto) vo max2 2.0 - - vp-p thd Q 1%, rl=600 ? digital input (dc) parameter symbol limits unit conditions min. typ. max. input l level voltage v il - - 0.7 v input h level voltage v ih 2.1 - - v input current i in - - 2 a 0v, 3v force ? cpu interface parameter symbol limits unit conditions min. typ. max. cycle time tcyc 250 - - ns input data hold time tdh 50 - - ns input data setup time tds 50 - - ns chip select setup time tcs 50 - - ns chip select hold time tch 50 - - ns
technical note 3/16 www.rohm.com 2010.09 - rev. a ? 2010 rohm co., ltd. all rights reserved. bu7831kn reference data (unless otherwise specified, ta=25 ,avdd=dvdd=3.0v) 0.0 0.2 0.4 0.6 0.8 1.0 2.0 2.5 3.0 3.5 4.0 4.5 supply voltage : vdd(v) stand by current : ist( a) -100 -80 -60 -40 -20 0 20 -100 -80 -60 -40 -20 0 input level : vin (dbv) spl : linearity (dbv) -100 -80 -60 -40 -20 0 20 -100 -80 -60 -40 -20 0 input level : vin (dbv) exto : linearity (dbv) 0.01 0.10 1.00 10.00 100.00 -100 -80 -60 -40 -20 0 input level : vin (dbv) spl : thd+n (%) -100 -80 -60 -40 -20 0 20 -100 -80 -60 -40 -20 0 input level : vin (dbv) hpl : linearity (dbv) 0.01 0.10 1.00 10.00 100.00 -100 -80 -60 -40 -20 0 input level : vin (dbv) spr : thd+n (%) 0.01 0.10 1.00 10.00 100.00 -100 -80 -60 -40 -20 0 input level : vin (dbv) exto : thd+n (%) 0.01 0.10 1.00 10.00 100.00 -100 -80 -60 -40 -20 0 input level : vin (dbv) hpr : thd+n (%) 0.01 0.10 1.00 10.00 100.00 -100 -80 -60 -40 -20 0 input level : vin (dbv) hpl : thd+n (%) 0 2 4 6 8 10 2.0 2.5 3.0 3.5 4.0 4.5 supply voltage : vdd(v) circuit current : icc(ma) 0 2 4 6 8 10 2.0 2.5 3.0 3.5 4.0 4.5 supply voltage : vdd(v) circuit current : icc(ma) fig.1 stand-by current fig.6 total harmonic distortion (exto) fig.11 linearity (exto) fig.12 linearity (spl) -100 -80 -60 -40 -20 0 20 -100 -80 -60 -40 -20 0 input level : vin (dbv) hpr : linearity (dbv) fig.5 total harmonic distortion (hpr) fig.4 total harmonic distortion (hpl) fig.2 operation current at headphone amp part fig.9 linearity (hpl) fig.8 total harmonic distortion (spr) fig.7 total harmonic distortion (spl) fig.10 linearity (hpr) fig.3 operation current of all blocks
technical note 4/16 www.rohm.com 2010.09 - rev. a ? 2010 rohm co., ltd. all rights reserved. bu7831kn -110 -105 -100 -95 -90 -85 -80 -75 -70 2.0 2.5 3.0 3.5 4.0 4.5 suplly voltage : vdd(v) noise [dbv] -110 -105 -100 -95 -90 -85 -80 -75 -70 2.0 2.5 3.0 3.5 4.0 4.5 suplly voltage : vdd(v) noise [dbv] -110 -105 -100 -95 -90 -85 -80 -75 -70 2.0 2.5 3.0 3.5 4.0 4.5 supply voltage : vdd(v) noise [dbv] -110 -105 -100 -95 -90 -85 -80 -75 -70 2.0 2.5 3.0 3.5 4.0 4.5 suplly voltage : vdd(v) noise [dbv] -100 -80 -60 -40 -20 0 20 -100 -80 -60 -40 -20 0 input level : vin (dbv) spr : linearity (dbv) fig.13 linearity (spr) fig.14 output noise (hpl) fig.15 output noise (hpr) fig.16 output noise (exto) fig.18 output noise (spr) -110 -105 -100 -95 -90 -85 -80 -75 -70 2.0 2.5 3.0 3.5 4.0 4.5 suplly voltage : vdd(v) noise [dbv] fig.17 output noise (spl)
technical note 5/16 www.rohm.com 2010.09 - rev. a ? 2010 rohm co., ltd. all rights reserved. bu7831kn block diagram, recommended application circuit, pin assign fig.19 application circuit example fig.20 pin assign mixsel2 2.5 3.3v vdd vss st1l st1r st2l st2r st3l st3r cvcom nrst sclk sdata ncs cstep cstart spl spr exto hpl hpr 600 16 16 0 2dbstep 0/ 0/ 0/ 0/ bias serial control att3r att3l att2r att1r att1l mixsel 1 mixsel4 att4l att4r att5 att6l att6r mixsel5 mixsel3 att2l 1f 1f cpu i/f reset + + 100 f 100 f + 4.7 f + 0 2dbstep 0 2dbstep 0 2dbstep 0 \ 28db 2dbstep 0 2dbstep 0 2dbstep other source pcm codec stereo tuner stereo melody cpu stereo speaker amp stereoheadphone external \ 28db \ 28db \ 28db \ 28db \ 28db \ 28db \ 6db \ 6db \ 6db \ 6db 1 2 3 4 5 vss hpr st3l spr exto st2r nrst st1r vdd cstep st2l st3r cstart hpl st1l ncs sdata sclk bu7831kn cvcom spl 10 9 8 7 6 20 19 18 17 16 15 14 13 12 11
technical note 6/16 www.rohm.com 2010.09 - rev. a ? 2010 rohm co., ltd. all rights reserved. bu7831kn input terminal equivalent circuit diagram a sclk, sdata, ncs, nrst pad b cs tep pa d c st2r, st2l, st3r, st3l pad 100k (typ) d st1r, st1l pa d e vss, vdd pad f cvcom, cstart pa d g hpr, hpl, exto, spr, spl pad about digital input (type a): when you will hav e possibility to give hi-z for input pin, you must select from the under heads for protect the pin floated. a) pull down with less than 10kohm b) pull up c) give ?l? sign al just before hi-z. fig.21 equivalent circuit diagram no. name function no. name function 1 sclk serial clock input of cpu i/f 11 cvcom reference voltage 2 sdata serial data input of cpu i/f 12 cstep connect capacitor for blocking pop-noise 3 ncs chip select input of cpu i/f 13 hpr headphone r channel output 4 nrst reset input l=reset 14 vss ground 5 st1r stereo 1 input for r channel 15 vdd power supply 6 st1l stereo 1 input for l channel 16 hpl headphone l channel output 7 st2r stereo 2 input for r channel 17 cstart connect capacitor for blocking start up pop-noise 8 st2l stereo 2 input for l channel 18 exto 600 driver output 9 st3r stereo 3 input for r channel 19 spr speaker r channel output 10 st3l stereo 3 input for l channel 20 spl speaker l channel output
technical note 7/16 www.rohm.com 2010.09 - rev. a ? 2010 rohm co., ltd. all rights reserved. bu7831kn detail explanation of each function blocks ? reference voltage (bias part) the reference voltage occurrence part that decides the operating point of a group of internal amplifiers is the following. cvcom_out, cstart_out, all is about 1/2vdd[v], and therefore the level of internal signal becomes about 1/2vdd[v], too. cvcom has a pre-charge function, and it is possible to shorten of rising time of the bias in on. (as for the cvcom, on/off of the pre-charge function is possible with a register bit.) cstart terminal is used as a reference voltage of the out put amplifier of the headphone, and it included pop sound low stage function in headphone path on/ off, too. capacitor value with the outside in the figure is recommend ed to make the psrr character of both standard voltages the same. choose the thing whose character is good in capacito r with the outside because it becomes the reference voltage of the internal circuit. pre pre charge char ge cvcom cstart 30k 30k 4.7 f 140k 140k 1 f fig.22 cvcom, cstrt equivalent circuit ? analog input part the following is about each analog. input. please use the coupling capacitor with the outside in consid eration of frequency characteristic of input. input dc leve l is about 1/2vdd[v]. input impedance on off (input non-choice) becomes hi-z. when an input terminal isn?t used (when an input path isn?t set up) is open, and there is no problem. but, be careful that noise from the outside and so on doesn?t turn because it becom es hi-z. when it is anxious, pull-down in about 100k ? . st1l and st1r inputs change input impedance by setting of att1l and att1r respectively. st1l(r) input impedance att1 l (r) setting 200k (typ) 0db setting 400k (typ) mute setting cvcom_out 200k 200k st1l st1r st2l st2r st3l st3r cvcom_out 100k 100k 100k fig.23 input pins equivalent circui cstart_out to the headphone amplifier output step cvcom_out to the one except for the headphone amplifier output step
technical note 8/16 www.rohm.com 2010.09 - rev. a ? 2010 rohm co., ltd. all rights reserved. bu7831kn ? analog output part the following is about analog output part (exto, spl, spr, hpl, hpr). each output amplifier is li nked path select (mixer1 5). because stereo output is pr esumed, hpl and hpr are turned on/off at t he same time, and with pop sound decrease function. mixer1 at the time of path choice spl output amplifier on mixer2 at the time of path choice spr output amplifier on mixer3 at the time of path c hoice exto output amplifier on mixer4 or mixer5 at the time of path choice hpl, hpr output amplifier on be careful that noise from the outside and so on doesn't turn because it becomes hi-z though the output that isn?t used is open and there is no problem. when it is anxious, pull-down in about 100k ? . output port output impedance (dc) at on output impedance (dc) at off exto 1.4 hi-z spl spr 2.2 hi-z hpl 1.5 gnd short hpr 0.6 ? attenuator each attenuator has 16 steps (4bit), which contains mute. att6l and att6r that is attenu ator of the headphone output has soft mute that decreases pop sound in swit ching. (att1 - 5 don't have this function.) the amount of software depends on a capacitor to connect to the cstep terminal. decide the value of a capacitor to connect to the cstep terminal after you take pop volume and delay time into consideration because a fixed number becomes the bottom mostly at the time of that switching. mute thsmute=20010 3 cstep [s] thsmute at t at t thsmute fig.24 ? analog path part about the internal pass circuit, the circui t that it has a path setting by the re gister turns it on. for example, when mixsel*_0 is chosen with either att, st1r input is chosen , and a group of input amplifiers of st1r turns it on. and a connected output amplifier is turned on when either input is chosen with mi xsel* in the same way to the output circuit. att setting hp output
technical note 9/16 www.rohm.com 2010.09 - rev. a ? 2010 rohm co., ltd. all rights reserved. bu7831kn ? pop sound decrease circuit at the time of head phone output on/ off it has the function that decreases pop sou nd that occurs at the time of on/ o ff of the headphone output (hpl and hpr). when headphone output is chosen/non-chos en, it is the function that the dc output of the h eadphone output goes down smoothly on falling/rising. rising time is decided by the capacitor value that it is connected to the cstart terminal. falling time is decided by the cstart terminal and the coupling capacitor. pop sound decreases as much as to be here if rising/falling is smooth. decide the value of a capacitor to connect to the cstart termi nal after you take pop sound, rising/falling time into consideration because a fixed number bec omes the bottom mostly at the time of that switching. and do settlement of timing in consideration of this ti me when you make it turn on/off by the continuance. pop sound is made when it switches in t he middle of the descent of rising/falling. thpout (dc) headphone on/off headphone output thpout=80.6 10 3 cs ta rt [s] fig.25 ? digital part input such as clock, data is to input "h" or "l" properly about each digital input terminal to contain at the time of standing by as well. if you turn off the power (when hi-z is input), a cont rol side is to avoid an input terminal's becoming open in either following method it has the possibility that penetration electric current occurs because it becomes the input which isn't fixed as bu7831kn when it isn't avoided. a terminal, in less than 10k ? , pull-down b terminal, pull-up c when it becomes input hi-z, "l" is given to it. ? cpu interface fig.26 sdata will be confirmed by 16 th clock that is inputted after ncs falling edge, and then serial data reflect to internal register by ncs falling edge. the data format is 16bit rear. cpu i/f is 1byte=16bit. because it doesn't cope with continuous data transmission, you must su rely insert the section of ncs= "h" between 1st byte and 2nd byte. the following the is to secure time beyond the sclk 1 clock. (th R tcyc) ncs scl sdata th fig.27 a7 sclk sdata tcs ncs tds tdh a6 d6 d5 d4 d3 d2 d1 d0 a5 a4 a3 a2 d7 a1 tch tcyc a0
technical note 10/16 www.rohm.com 2010.09 - rev. a ? 2010 rohm co., ltd. all rights reserved. bu7831kn using in the bu7831kn dedicated line is recommended with a cpu i/f. control it by a sequence like the botto m when you don't do special control. fig.28 cpu i/f input signals waveforms fig.29 please ncs of bu7831kn is set ?h? when you control the other ic. when ncs is "h", the register of bu7831kn can't write it. note ) ncs_oth is based on the specif ications of other ic's. control ncs_oth sdata other ic control bu7831kn sclk ncs bu7831kn control bu7831kn ncs ncs_oth sdata sclk cpu other ic
technical note 11/16 www.rohm.com 2010.09 - rev. a ? 2010 rohm co., ltd. all rights reserved. bu7831kn recommended operation sequence vdd on nrst=l start. rise up vdd first. after the mode setting, input the audio signal. fig. 30 vdd off hprst=0(82h=00h) is taken at the time of use of hpamp first. vdd off, after the mute on setting(88h=ffh), nrst=l at using hpamp. vdd off, after nrst=l at not using hpamp. fig. 31 hpamp on mute off (hprst 82h bit0), after the mode setting. fig. 32 ? hpamp output rise time setting up expression thpout = 80.6 10 3 cstart [s] (typ) ? hsmute delay time setting up expression thsmute = 200 10 3 cstep [s] (typ) cpu i/f audio signal analog signal mode set nrst vdd vdd att6l,r(88h) nrst headphone output 00h 01h ffh xxh hprst(82h) hprst (82h bit0) headphone output(dc) cpu i/f mode set thpout thsmute
technical note 12/16 www.rohm.com 2010.09 - rev. a ? 2010 rohm co., ltd. all rights reserved. bu7831kn hpamp off hprst=0(82h bit0) is set up first. other setups are canceled after att6l, r is set up in the mute(88h=ffh). fig. 33 hpamp volume control as the mute time is set by capacitor connected cste p pin,volume control it is set after enough time. the delay time is as same as thsmute. fig. 34 hprst (82h bit0) cpu i/f att6l,r (88h bit7-0) thsmute path lifting ffh xxh headphone output headphone output thsmute thsmute volume control bit
technical note 13/16 www.rohm.com 2010.09 - rev. a ? 2010 rohm co., ltd. all rights reserved. bu7831kn mode setting flow *1 : when the analog path setting is not changed. (repeat output) *2 : when the power supply off, after output. fig. 35 *2 *1 hpamp reset lifting (using hpamp) output analog power on (pdn=1) input path setting mixing path setting reference voltage on (vcom=1) power supply on stand-by mode analog power off (pdn=0) hpamp mute on (using hpamp) (att6=ffh) reset (nrst=0 or vcom=0) power supply off hpamp reset setting (using hpamp) (hprst=0)
technical note 14/16 www.rohm.com 2010.09 - rev. a ? 2010 rohm co., ltd. all rights reserved. bu7831kn notes for use 1) absolute maximum ratings an excess in the absolute maximum ratings, such as supply voltage, temperature range of operating conditions, etc., can break down the devices, thus making impossible to identify breaking mode, such as a short circuit or an open circuit. if any over rated values will expect to exceed the absolute maximum ratings, consider adding circuit protection devices, such as fuses. 2) operating conditions characteristics are guaranteed under the co nditions of each specified parameter. 3) reverse polarity connection of the power supply connecting of the power supply in reverse polarity can damage ic. take precautions when connecting the power supply lines. an external direction diode can be added. 4) power supply line design pcb layout pattern to provide low impedance gnd and supply lines. to obtain a low noise ground and supply line, separate the ground section and supply lines of the digital and analog blocks. furthermore, for all power supply terminals to ics, connect a capacitor between the power supply and the gnd terminal. when applying electrolytic capacitors in the circuit, note t hat capacitance characteristic values are reduced at low temperatures. 5) gnd voltage gnd potential should maintain at the minimum ground voltage level. furthermore, no terminals should be lower than the gnd potential voltage includi ng electric transients. 6) short circuit between terminals and gnd or other devices pay attention to the assembly direction of the ics. wrong mounting dire ction or shorts between te rminals to gnd, or other components on the circuits, can damage the ic. 7) operation in a str ong electromagnetic field using the ics in a strong electromagnetic field can cause operation malfunction. 8) inspection with set pcb during testing, turn on or off the power before m ounting or dismounting the boar d from the test board. do not power up the board without waiting for the output capa citors to discharge. the capacitors in the low output impedance terminal can stress the device. pa y attention to the electro static volt ages during ic handling, transportation, and storage. 9) input terminals in terms of the construction of ic, parasitic elements are inev itably formed in relation to potential. the operation of the parasitic element can cause interference with circuit operation, thus resulting in a malfuncti on and breakdown of the input terminal. therefore, pay thorough attention not to apply a volt age lower than the gnd to the input terminals. furthermore, do not apply a voltage to the input terminals when no power supply voltage is applied to the ic. in addition, even if the power supply voltage is applied, apply a voltage lower than the power supply voltage to the input terminals, or a voltage within the guaranteed value of electrical characteristics. 10) ground wiring patterns the power supply and ground lines must be as short and thick as possible to reduce line impedance. fluctuating voltage on the power ground line may damage the device. 11) external capacitor when using external ceramic capacitors, consider degradation in the nominal capacitance value due to dc bias and changes in the capacitance with temperature.
technical note 15/16 www.rohm.com 2010.09 - rev. a ? 2010 rohm co., ltd. all rights reserved. bu7831kn power dissipation this value is the measurement value that was mounted on the pcb by rohm material : grass epoxy size : 70mm 70mm 1.6mm fig.36 0 100 200 300 400 500 600 700 0 25 50 75 100 125 150 ambient temperature : ta() power dissipation : pd mw) 530mw
technical note 16/16 www.rohm.com 2010.09 - rev. a ? 2010 rohm co., ltd. all rights reserved. bu7831kn ordering part number b u 7 8 3 1 k n - e 2 part no. part no. 7831 package kn : vqfn20 packaging and forming specification e2: embossed tape and reel (unit : mm) vqfn20 0.05 m 0.05 (0.22) 0.5 3 ?( 0 . 35) (0.5) 4.00.1 4.20.1 4.00.1 4.20.1 4.00.1 4.20.1 0.2 2 0.05 20 16 10 6 5 1 11 15 (1.1) 0.95max 0.220.05 0.02 +0.03 ?0.02 0.6 +0.1 ?0.3 notice : do not use the dotted line area for soldering ? order quantity needs to be multiple of the minimum quantity. embossed carrier tape (with dry pack) tape quantity direction of feed the direction is the 1pin of product is at the upper left when you hold reel on the left hand and you pull out the tape on the right hand 2500pcs e2 () direction of feed reel 1pin
r1010 a www.rohm.com ? 2010 rohm co., ltd. all rights reserved. notice rohm customer support system http://www.rohm.com/contact/ thank you for your accessing to rohm product informations. more detail product informations and catalogs are available, please contact us. notes no copying or reproduction of this document, in part or in whole, is permitted without the consent of rohm co.,ltd. the content specied herein is subject to change for improvement without notice. the content specied herein is for the purpose of introducing rohm's products (hereinafter "products"). if you wish to use any such product, please be sure to refer to the specications, which can be obtained from rohm upon request. examples of application circuits, circuit constants and any other information contained herein illustrate the standard usage and operations of the products. the peripheral conditions must be taken into account when designing circuits for mass production. great care was taken in ensuring the accuracy of the information specied in this document. however, should you incur any damage arising from any inaccuracy or misprint of such information, rohm shall bear no responsibility for such damage. the technical information specied herein is intended only to show the typical functions of and examples of application circuits for the products. rohm does not grant you, explicitly or implicitly, any license to use or exercise intellectual property or other rights held by rohm and other parties. rohm shall bear no responsibility whatsoever for any dispute arising from the use of such technical information. the products specied in this document are intended to be used with general-use electronic equipment or devices (such as audio visual equipment, ofce-automation equipment, commu- nication devices, electronic appliances and amusement devices). the products specied in this document are not designed to be radiation tolerant. while rohm always makes efforts to enhance the quality and reliability of its products, a product may fail or malfunction for a variety of reasons. please be sure to implement in your equipment using the products safety measures to guard against the possibility of physical injury, re or any other damage caused in the event of the failure of any product, such as derating, redunda ncy, re control and fail-safe designs. rohm shall bear no responsibility whatsoever for your use of any product outside of the prescribed scope or not in accordance with the instruction manual. the products are not designed or manufactured to be used with any equipment, device or system which requires an extremely high level of reliability the failure or malfunction of which may result in a direct threat to human life or create a risk of human injury (such as a medical instrument, transportation equipment, aerospac e machinery, nuclear-reactor controller, fuel- controller or other safety device). rohm shall bear no responsibility in any way for use of any of the products for the above special purposes. if a product is intended to be used for any such special purpose, please contact a rohm sales representative before purchasing. if you intend to export or ship overseas any product or technology specied herein that may be controlled under the foreign exchange and the foreign trade law, you will be required to obtain a license or permit under the law.

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