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1/13 www.rohm.com 2010.09 - rev. a ? 2010 rohm co., ltd. all rights reserved. audio accessory ics for mobile devices mixer & selector ic with pcm codec and 16bit d/a converter bu7861kn description the ?in/output selector with built-in pcm codec 16bit d/a c onverter? lsi is ideal for improving the sound quality of and miniaturizing cellular phone handsets with music playback function, accumulating analog circuits for sound which application cpus and bass band lsis are not ideally able to handle. features 1) loaded with stereo 16bit audio d/a converter 2) compatible with stereo and analog interfaces 3) built-in stereo headphone amp (16 ) 4) lowpass correction circuit built into the headphone amp 5) gain-adjustable volume built in 6) flexible mixing function built in applications portable information communication devices such as cellular phone handsets and pda (personal digital assistants) cellular phone handsets with music playback function absolute maximum ratings parameter symbol ratings unit supply voltage dvdd avdd, pvdd -0.3 4.5 v power dissipation pd 500 *1 mw operational temperature range t opr -25 +80 storage temperature range t stg -55 +125 *1 when used at over ta=25 , lessen by 5.0mw per 1 increase. operating conditions parameter symbol ratings unit min. typ. max. digital supply voltage dvdd 2.7 3.0 3.3 v analog supply voltage avdd 2.7 3.0 3.3 v power supply voltage pvdd 2.7 3.0 3.3 v pll synchronous signal frequency fsync 8 khz no.10087eat04
technical note 2/13 www.rohm.com 2010.09 - rev. a ? 2010 rohm co., ltd. all rights reserved. bu7861kn electrical characteristics (unless specified, ta=25 , dvdd=avdd=3.0v, pvdd= 3.0v, fsync=8khz) ?complete block parameter symbol limits unit conditions min. typ. max. consumed current 1 idd1 0.1 10 a when all power down, fsync l fixed consumed current 2 idd2 0.8 1.2 ma refon, fsync l fixed consumed current 3 idd3 1.7 2.6 ma refon+pllon, fsync=8khz consumed current 4 idd4 1.6 2.4 ma refon+micbon, fsync l fixed consumed current 5 idd5 1.0 1.5 ma refon+extout, fsync l fixed consumed current 6 idd6 5.9 9.0 ma refon+pllon+vicon, fsync=8khz consumed current 7 idd7 6.4 9.6 ma refon+pllon+vicon+toneon, fsync=8khz consumed current 8 idd8 2.2 3.3 ma refon+recon, fsync l fixed consumed current 9 idd9 2.9 4.5 ma refon+hpon, fsync l fixed consumed current 10 idd10 2.2 3.3 ma refon+ hpvolon, fsync l fixed consumed current 11 idd11 10.0 15.0 ma dacon, sysclk=256fs consumed current 12 idd12 18.0 27.0 ma all power on fsync=8khz sysclk=256fs digital high level input voltage vih 0.8 dvdd v digital low level input voltage vil 0.2 dvdd v digital high level input current iih 10 a vih=dvdd digital low level input current iil -10 a vil=0v digital high level output voltage voh dvdd -0.5 v ioh=-1ma digital low level output voltage vol 0.5 v iol=1ma schmidt input hysteresis width vhys 0.3 0.5 0.7 v sysclk, bclk, lrclk, fsync, dspclk
technical note 3/13 www.rohm.com 2010.09 - rev. a ? 2010 rohm co., ltd. all rights reserved. bu7861kn ? sound block parameter limits unit conditions min. typ. max. frequency characteristics -3 +3 db reference level (-20db due to full scale) f=20hz 20khz -3db band width dac full scale 1.4 1.8 2.2 v p-p 0.6 vdd gain error between channels - - 1.5 db difference between lch and rch levels during dac full scale distortion (no bass boost) 1 % dac input=-0.5dbfs, hp_vol=-2db, hp2_vol=0db distortion (with bass boost) 10 % dac input=-0.5dbfs, hp_vol=-2db, hp2_vol=0db s/n 75 83 db during full scale hp_vol, hp2_vol=0db, f=1khz, a-weighted stereo headphone amp included crosstalk 70 80 db measures the leak from lch to rch during full-scale output. 1khz bpf output level during mute 70 80 db 1khz bpf ? driver amp block parameter limits unit conditions min. typ. max. microphone amp gain configurable range (thd Q1%) 40 db f=100hz 3.4khz maximum output voltage (thd Q1%) 1.0 vrms mico terminal, f=1khz s/n 60 66 db c-message psrr 100hz 12 20 db 0.2v p-p superimposed to supply comin 1.0f, micin no input 1khz 25 35 receiver amp load 26 32 maximum output power (thd Q1% 31.25 45 mw rl=32 , f=1khz s/n 80 90 db rl=32 , c-message offset voltage 5 100 mv psrr 100hz 65 77 db 0.2v p-p superimposed to supply comin 1.0f 1khz 60 70 stereo headphone amp load 12 16 maximum output power (thd Q1% 15 25 mw r l =16 , f=1khz psrr 100hz 15 26 db 0.2v p-p superimposed to supply comin 1.0f, hp_vol=0db 1khz 40 48 spout terminal maximum output voltage (thd Q1%) 0.707 vrms rl=10k , f=1khz extout terminal maximum output voltage (thd Q1%) 0.707 vrms rl=3k, f=1khz
technical note 4/13 www.rohm.com 2010.09 - rev. a ? 2010 rohm co., ltd. all rights reserved. bu7861kn ? codec block parameter limits unit conditions min. typ. max. transmitting side reference input level micin dspout 0.44 0.50 0.56 vrms when 1020hz, sine wave, 0dbm0 transmitting mic amp gain 0db, tx_vol 0db extin dspout 0.119 0.135 0.151 vrms when 1020hz, sine wave, 0dbm0 transmitting amp gain 11.37db, tx_vol 0db receiving side reference input level dspin recp 0.44 0.50 0.56 vrms at 1020hz, sine wave, 0dbm0 input rx_vol 0db dspin spout 0.44 0.50 0.56 vrms at 1020hz, sine wave, 0dbm0 input rx_vol 0db dspin extout 0.44 0.50 0.56 vrms at 1020hz, sine wave, 0dbm0 input rx_vol 0db pass gain extin recn 2.4 3.2 4.0 db extin input, rx_testline path rx_vol 0db extin spout 2.4 3.2 4.0 db extin input, rx_testline path sprx_vol 0db transmitter signal vs. general power distortion micin dspout -45dbm0 24 db 1020hz, sine wave, mic amp gain 0db tx_vol 0db, c-message -40dbm0 29 0, -30dbm0 35 receiver signal vs. general power distortion dspin recp -45dbm0 24 db 1020hz, sine wave rx_vol 0db, c-message -40dbm0 29 0, -30dbm0 35 transmitter transmission level micin dspout -55dbm0 -0.9 0.9 db 1020hz, -10dbm0 typical mic amp gain 0db tx_vol 0db, c-message -50dbm0 -0.6 0.6 0, -40dbm0 -0.3 0.3 receiver transmission level dspin recp -55dbm0 -0.9 0.9 db 1020hz, -10dbm0 typical rx_vol 0db, c-message -50dbm0 -0.6 0.6 0, -40dbm0 -0.3 0.3 transmitter transmission loss f special micin dspout 0.06khz 24 db 1020hz, 0dbm0 at transmission mic amp gain 0db tx_vol 0db 0.2khz 0 2.5 0.3 3.0khz -0.3 0.3 3.4khz -0.3 0.9 3.6khz 0 3.78khz 6.5 receiver transmission loss f special dspin recp 0.3 3.0khz -0.3 0.5 db 1020hz, 0dbm0 at input rx_vol 0db 3.4khz -0.3 0.9 3.6khz 0.0 3.78khz 6.5 noise during idle transmission micin dspout -65 dbm0 mic amp gain 0db tx_vol 0db, c-message noise during idle reception dspin rec[p-n] -75 dbv dspin all0 rx_vol 0db, c-message crosstalk (transmitter receiver) micin rec[p-n] 60 70 db 1020hz, 0dbm0 at transmission mic amp gain 0db dspin all0 tx_vol 0db rx_vol 0db st_mt off crosstalk (receiver transmitter) dspin dspout 63 68 db 1020hz, 0dbm0 at input, 2040hz component mic amp gain 30db tx_vol 0db rx_vol 0db st_mt on rx higher harmonic component distortion 2 nd to 5 th time 40 50 db 1020hz, sine wave, 0dbm0 at input rx_vol 0db
technical note 5/13 www.rohm.com 2010.09 - rev. a ? 2010 rohm co., ltd. all rights reserved. bu7861kn ? pass switch block parameter limits unit conditions min. typ. max. mute level 1 70 80 db configured at each mute sw measured at 1khz bpf 2 70 80 db configured at each mute sw leakage amount to each test line during normal usage measured at 1khz bpf receiving side is muted digitally by vic_mt and spvic_mt. 1 mic_sel, mic_mt, extin_mt, mel_mt, vic_mt, rec_mt, st_mt, hsjl_m t, hsjr_mt, spvic_mt, spmel_vol, extout_sel, tone_mt, sound_mt, dig_mt, ain_mt, hp _smt, spout_smt, extout_smt, rec_smt, hpr_mt, hpl_mt 2 tx_test1, tx_test2, rx_test1, rx_test2, rec_ tst, hpr_tst, hpl_tst ? dtmf/tone generator block parameter symbol limits unit conditions min. typ. max. output level v dtmf_l -15.3 -14.3 -13.3 dbv f:dtmf_l tone recp mel_vol 0db rx_vol 0db v dtmf_h -12.8 -11.8 -10.8 dbv f:dtmf_h tone recp mel_vol 0db rx_vol 0db v tone_l -15.3 -14.3 -13.3 dbv f: designated tone, low band tone recp mel_vol 0db rx_vol 0db v tone_h -12.8 -11.8 -10.8 dbv f: designated tone, high band tone recp mel_vol 0db rx_vol 0db tone distortion s dtn -38 db f=1khz ( designated tone) tone rec[p-n] mel_vol 0db rx_vol 0db c-message ? microphone bias block parameter symbol limits unit conditions min. typ. max. output voltage vo 1.8 2.0 2.2 v io=500a maximum output current io 2 ma load stability vo1 14.0 30 mv io=100a 2ma output noise voltage n -109 -90 dbv c-message io=500a
technical note 6/13 www.rohm.com 2010.09 - rev. a ? 2010 rohm co., ltd. all rights reserved. bu7861kn reference data -16 -14 -12 -10 -8 -6 -4 -2 0 2 10 100 1000 10000 100000 fr eq uency [hz] bass boost gain [db] 6db 8db 10db 12db 14db 2db 4db -140 -120 -100 -80 -60 -40 -20 0 0 5000 10000 15000 20000 freq uency [hz] level [dbv] 14 15 16 17 18 19 -50 0 50 100 temperature[ ] circuit current[ma] vdd=3.4v vdd=3.0v vdd=2.6v 0.0 0.5 1.0 1.5 2.0 - 50 0 50 100 temperature [ ] stand- by curr ent [ua] vdd=3.4v vdd=2.6v vdd=3.0v -1.0 -0.8 -0.6 -0.4 -0.2 0.0 0.2 0.4 0.6 0.8 1.0 0 5000 10000 15000 20000 freq uency [hz] gain [db] lch rch -90 -80 -70 -60 -50 -40 -60 -40 -20 0 dac output lev el [dbfs] thd+n [db] lch rch - 140 - 120 - 100 -80 -60 -40 -20 0 0 5000 10000 15000 20000 fr eq uency [hz] level [dbv] -16 -14 -12 -10 -8 -6 -4 -2 0 2 10 100 1000 10000 100000 freq uency [hz] bass boost gain [db] 2db 4db 6db 8db 10db 12db 14db -60 -50 -40 -30 -20 -10 0 10 0 1000 2000 3000 4000 freq uency [hz] tx gain [db] -12 -10 -8 -6 -4 -2 0 2 0 1000 2000 3000 4000 freq uency [hz] rx gain [db] -80 -70 -60 -50 -40 -30 -20 -10 0 0 20406080100 output power [mw] thd+n [db] -80 -70 -60 -50 -40 -30 -20 -10 0 0 1020304050 output power [mw] thd+n [db] fig.1 operational current (all on) fig.2 static consumed current fig.3 16bit d/a converter frequency characteristics@ 0dbfs fig.4 16bit d/a converter distortion @ 1khz fig.5 16bit d/a converter fft @ 0dbfs, 1khz fig.6 16bit d/a converter fft @ 0fs fig.7 bus boost frequency characteristics fig.8 bus boost + high pass emphasis frequency characteristics fig.9 voice codec tx frequency characteristics fig.10 voice codec rx frequency characteristics fig.12 receiver amp output characteristics @ vdd=3.0v, 1khz fig.11 headphone amp output characteristics @ vdd=3.0v, 1khz
technical note 7/13 www.rohm.com 2010.09 - rev. a ? 2010 rohm co., ltd. all rights reserved. bu7861kn block diagrams fig.13 bu7861kn block diagram fig.14 bu7861kn pin placement diagram cpu i/f vref/common dsp i/f rx_test1 27k tx_test1 bpf a/d tx_test2 tx_testline rx_testline mic_sel extout rec_mt rx_vol rx_test2 vic_mt st_mt st_vol d/a lpf sprx_vol spvic_mt mel_mt audclk audtxd audrxd audcs txcom rxcom pvcom comin avdd avss dvdd dvss plllpf fsync dspclk dspin dspout ain_l ain_r mico micin_1 extin extout recn recp hp_l hp_r spout pvdd pvss vdd/vss rstb 100k 100k 16step 330k spmel_mt spmel_vol sdi lrclk hp_li hp_ri digital i/f digital bass boost bclk 8step 32step 32step 16step 32step 32step +6 -8db 0 -30db -18 -42db +6 -54db +6 -8db 0 -30db 0 -45db sysclk + - + - + - + - + - + - + - + - + - cstep pop hp_vol cpop test hpl_mt hsjl _mt + - ain_vol mic bias micb_1 micb_2 micin_2 micin_c + - + - + - ain_mt dig_mt sound_mt dtmf/ tone tone_mt extgnd dacro daclo smute smute mic_mt extin_mt hpr_mt hsjr _mt 16step 0 -28db pll extout_smt spout_smt hp_s mt tx_vol rec_smt 100k 200k 200k 100k 70.8k 70.8k 100k 100k 200k 200k 50k 50k 50k 50k 25k 25k 80k 80k 60k 41.7k 60k 60k 41.7k 60k 60k 40k 40k 100k 100k 100k 100k mel_vol hp2_vol 8step +14 0db hp2_vol 8step +14 0db gain=+3db gain=+3db 100k rec_tst hpl_tst hpr_tst 100k 100k mic_bias gain=3.2db gain=3.2db 25k 25k 16bit dac hp_ri hp_r dspin dvss pvdd hp_l dspclk dspout dvdd bu7861kn hp_li 24 23 22 21 20 36 35 34 33 32 31 30 pvss audrxd 18 19 sysclk bclk recn cpop cstep recp smute 37 38 39 40 41 43 42 rxcom txcom 1 2 4 5 6 7 3 micin_c micin_1 mico micin_2 extgnd extin avdd 8 9 10 spout ain_l 11 12 ain_r daclo avss lrclk sdi rstb 17 16 15 13 14 test dacro audtxd audcs audclk 29 28 27 26 25 plllpf fsync comin pvcom extout 44 45 46 48 47 micb_1 micb_2
technical note 8/13 www.rohm.com 2010.09 - rev. a ? 2010 rohm co., ltd. all rights reserved. bu7861kn lowpass correction circuit the headphone output terminal (either hp_x or hpx_out) has a built-in ?lowpass correction circuit? to correct lowpass decay, comprised of output coupling capacity and headphone impedance. fig.15 headphone output section equivalent circuit lowpass cut-off frequency fc= 1/(2 ?? cl ? rl) lowpass boost frequency fboost = 1/(2 ?? cchpx ? 200k ) boost gain aboost = 20 ? log((200 k +1/(2 ?? f ? cchpx))/100 k ) (maximum lowpass boost is 6db.) the constant configuration ca lculates the lowpass cut-off frequency fc af ter confirming the output coupling capacity c l and headphone impedance r l used. cchpx is determined in order for the lowpass cut-off frequency fc and lowpass boost frequency fboost to roughly correspond. the recommended constants are cl = 100f, when rl = 16 and cchpx = 6800pf. the chart below shows the frequency characteristics (c alculated values) during recommended constant use. fig.16 low pass correction circuit frequency characteristics + - 200k 200k + hp_x or hpx_out hp_xi or hpx_fb c chpx c l r l output 100k -40 -35 -30 -25 -20 -15 -10 -5 0 5 10 1 10 100 1000 10000 100000 frequency [hz] gain [db] a fter correction before correction a mp output
technical note 9/13 www.rohm.com 2010.09 - rev. a ? 2010 rohm co., ltd. all rights reserved. bu7861kn recommended circuits fig.17 recommended circuit audclk audtxd audrxd audcs txcom rxcom pvcom comin avdd avss dvdd dvss plllpf fsync dspclk dspin dspout extin extout recn recp hp_l hp_r spout pvdd pvss rstb hp_li hp_ri smute sound source ic 0.01 0.1 1 1 1 1 cpu 32 8 sp amp 6800pf 100 16 100 + cpu i/f vref/common tx_vol dsp i/f rx_test1 tx_test1 a/d tx_test2 tx_testline rx_testline mic_sel extout rec_mt rx_vol rx_test2 vic_mt st_mt st_vol d/a lpf sprx_vol spvic_mt mel_mt ain_l ain_r mico micin_1 vdd/vss 16step mel_vol spmel_mt spmel_vol sdi lrclk digital i/f digital bass boost 16bit dac bclk 8step 32step 32step 16step 32step 32step +6 -8db 0 -30db -18 -42db +6 -54db +6 -8db 0 -30db 0 -45db sysclk + - cstep hp_vol test pll hpl_mt hsjl_mt + - ain_vol mic bias micb_1 micb_2 micin_2 micin_c ain_mt dig_mt sound_mt dtmf/ tone tone_mt dacro daclo smute cpu 0.1 mic_mt extin_mt hpr_mt hsjr_mt cpop 1 pop 16 16step 0 -28db 6800pf + - + - + - + - + - + - + - + - + - + - + - bpf + ++ + + hp2_vol 8step hp2_vol 8step dsp rec_tst hpr_tst hpl_tst mic_bias gain=3.2db gain=3.2db +14 0db +14 0db
technical note 10/13 www.rohm.com 2010.09 - rev. a ? 2010 rohm co., ltd. all rights reserved. bu7861kn input/output equivalent circuit figure no terminal name i/o analog/ digital terminal function power source circuit figure 1 mico o analog mic output avdd e 2 micin_c o analog mic selection output avdd e 3 micin_1 i analog mic1 input avdd e 4 micin_2 i analog mic2 input avdd e 5 extgnd o analog external ground avdd e 6 extin i analog external input - h 7 avdd - analog power source for analog - i 8 avss - analog gnd for analog avdd i 9 spout o analog speaker output avdd e 10 ain_l i analog melody input terminal lch avdd d 11 ain_r i analog melody input terminal rch avdd d 12 daclo i analog dac lch lpf condenser connected terminal avdd f 13 dacro i analog dac rch lpf condenser connected terminal avdd f 14 test i digital please connect to dvss dvdd a 15 rstb i digital l:reset input dvdd a 16 lrclk i digital lrclk terminal 44.1khz(fs) for dac dvdd b 17 sdi i digital sdi terminal for dac dvdd a 18 bclk i digital bclk terminal 2.8224mhz(64fs) for dac dvdd b 19 sysclk i digital sysclk terminal 11.2896mhz(256fs) for dac dvdd b 20 dvdd - digital the power source for digital - i 21 dvss - digital gnd for digital dvdd i 22 dspclk i digital pcmclock input for pcm signal dvdd b 23 dspout o digital pcmsignal input dvdd c 24 dspin i digital pcm signal input dvdd a 25 fsync i digital 8khz the reference clock for pll dvdd b 26 plllpf o analog condenser connected terminal for pll dvdd f 27 audclk i digital cpu i/f clock input terminal dvdd a 28 audcs i digital the chip selection terminal for cpu i/f (h active) dvdd a 29 audtxd i digital cpu i/fdata input terminal dvdd a 30 audrxd o digital cpu i/fdata output terminal dvdd c 31 pvss - analog gnd for headphone and receiver pvdd i 32 hp_li i analog lch head phone amplifier revision terminal in low limits pvdd f 33 hp_l o analog lch head phone amplifier output terminal pvdd e 34 hp_r o analog rch head phone amplifier output terminal pvdd e 35 hp_ri i analog rch head phone amplifier revision terminal in low limits pvdd f 36 pvdd - analog power source for headphone and receiver - i 37 recn o analog receiver output pvdd e 38 recp o analog receiver output pvdd e 39 cstep o analog step noise decrease terminal when volume is variable avdd f 40 cpop o analog pop sound decrease terminal avdd f 41 smute o analog constant terminal when soft mute avdd f 42 rxcom o analog receiving standard voltage output avdd e 43 txcom o analog transmit standard voltage output avdd e 44 pvcom o analog path standard voltage output avdd e 45 comin i analog standard voltage input terminal avdd g 46 extout o analog external output - h 47 micb_1 o analog mic bias output1 avdd e 48 micb_2 o analog mic bias output2 avdd e
technical note 11/13 www.rohm.com 2010.09 - rev. a ? 2010 rohm co., ltd. all rights reserved. bu7861kn fig.18 terminal equivalent circuit figure pad a pad b pad c pad d pad e pad f g pad h i pad pad
technical note 12/13 www.rohm.com 2010.09 - rev. a ? 2010 rohm co., ltd. all rights reserved. bu7861kn notes for use 1) absolute maximum ratings when applied voltage (vdd and vin), and the operating tem perature range (topr) and the like it exceeds absolute maximum rating, there is a possibility of destroying, because it cannot specify destructive mode such as short circuit or opening, when special mode which exceeds absolute maximum rati ng is supposed, that physical safety measure such as a fuse should be implemented. 2) recommendation operating range if it is this range, it is the range which almost can obtain the quality of according to expectation. concerning electric quality being something which is guaranteed under condition of each item. even inside t he recommendation operating range, voltage, temperature characteristic is shown. 3) about the opposite connection of the power source connector there is a possibility of destroying lsi with the opposite co nnection to the power source connector. please administer the measure such as the diode is inserted between power sour ce and the power source terminal of lsi outside as the protection for opposite connection destruction. 4) about the power source line at the time of designing the baseplate pattern, as for wiring of the power source/gnd line, please make sure to become low impedance. at that time, even digital type power sour ce and analog type power source being the same electric potential, please separate digital type power source pattern and analog type power source pattern, control the turning of digital noise to the analog power source due to the common impedance of wiring pattern. concerning the gnd line, please consider the similar pattern design. in addition, concerning a ll power source terminals of lsi, the condenser is inserted between power source and the gnd terminal, in the case of electrolysis condenser use, please decide constant with sufficient verification in regard to the fact of without being problem in qualitie s of the condenser which is used, such as the capacity pulling out happens in low temperature. 5) about gnd voltage as for electric potential of the gnd termi nal regarding what ever working conditi on, please make sure to become lowest electric potential. in addition, please really verify that do es not have the terminal which be comes electric potential below gnd include transient phenomenon 6) about the short circuit between the terminal and error installing the occasion where you install in the set baseplate, please pay attention to the directi on and the position gap of lsi sufficiently. when you install with mistake, there is a possibility of lsi destroying. in addition, there is a possibility of destruction concerning when it short-circ uits e.g. due to the foreign material enters between the terminal and between terminal and power source and gnd. 7) about the operation in the strong electromagnetic field as for the use in the strong electroma gnetic field, being to be a possibility of doing the malfunction, please note. 8) about the testing with the set baseplate when inspecting with the set baseplate, the condenser is c onnected to the lsi terminal whose impedance is low, because there is a possibility of stress depending on lsi, please be su re to do discharge in every process. in addition, when installing and removing the tool in inspec tion process, by all means with power source as off to connect, to inspect, to remove. furthermore, as a static electricity measure, pl ease note to administer the earth and the conveyance and preservation in the case of assemble process sufficiently. 9) about each input terminal with respect to the structure of lsi, the parasitic element is formed inevitably by the relationship of electric potential. it causes the interference of circ uit operation due to the fact that the parasi tic element operates, t he malfunction, even can become cause of destruction. therefore, e.g., the voltage which is lower than gnd in the input terminal is impressed, please note sufficiently not to do the method where the parasitic element operat es. in addition, when not impress power supply voltage in lsi, please do not impress voltage in the input terminal. furthermore, when power supply voltage is impressed even, as for each input terminal, please make voltage below power supply voltage or within guaranteed performance of electric quality. 10) about gnd wiring pattern when there are both small signal gnd and a heavy-current gnd, it separates small signal gnd pattern from heavy-current gnd pattern, in order that the pattern wiring and the voltage change caused by large current do not change the voltage of small-signal g nd, it is recommended to carry out the one-point grounding at the reference point of set.. please be careful of not to fluctuate the gnd wiring pattern of external parts 11) when in the external condenser, the ceramic condenser is used, please decide the constant on the consideration of the nominal capacity decrease caused by direct current bias an d the change of the capacity due to temperature etc.
technical note 13/13 www.rohm.com 2010.09 - rev. a ? 2010 rohm co., ltd. all rights reserved. bu7861kn ordering part number b d 7 8 6 1 k n - e 2 part no. part no. package kn: uqfn48 packaging and forming specification e2: embossed tape and reel (unit : mm) uqfn48 0.05 m 0.05 0.6 - 0.3 +0.1 25 24 13 (1.4) 3-(0.45) 0.4 12 +0.03 - 0.02 0.02 48 36 (0.2) 37 0.95max (0.55) 1 7.2 0.1 7.2 0.1 0.22 0.05 7.0 0.1 0.2 0.05 7.0 0.1 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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