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1/34 www.rohm.com 2012.03 - rev. a ? 2012 rohm co., ltd. all rights reserved. digital sound processors for fpd tvs 28bit audio dsp with built-in 2ch adc, 6ch dac and asrc BD9406KS2 general description this lsi is the digital sound processor which ma de the use digital signal processing for fpd tvs. dsp of rohm original is used for the tv sound pr ocessor unit, and it excels in cost performance. the asynchronous sampling rate converter is built in the digital input one line. the audio ad converter is built in the analog input one line. the audio da conver ters are built in the output three lines. features digital signal processor unit word length: 28bit (data ram) the fastest machine cycle: 40.7ns (512fs, fs=48khz) multiplier: 28x24 52 bit adder: 28+28 28bit data ram: 256x28bit coefficient ram: 128x24bit sampling frequency: fs=48khz master clock: 512fs (24.576mhz, fs=48khz) digital signal input (stereo 4 lines): 16/20/24bit (i 2 s, left-justified, right-justified) digital signal output (stereo 4 lines): 16/20/24bit (i 2 s, left-justified, right-justified, s/pdif) asynchronous sampling rate converter (stereo 1 line): 32khz/44.1khz 48khz audio adc: stereo input 1 line 20bit 64 x over-sampling sigma delta adc s/n: 90db thd+n: 0.02% (sine-wave 1khz, -0.5db) digital hpf (fc=1hz) audio dac: stereo output 2 lines 24bit 8x over-sampling digital filter + 1bit sigma delta dac s/n: 96db thd+n: 0.005% (sine-wave 1khz, 0db) audio 16bit dac: stereo output 1 line 24bit 8x over-sampling digital filter + audio 16bit dac s/n: 90db thd+n: 0.03% (sine-wave 1khz, 0db) the sound signal processing function for fpd tvs pre-scaler, channel mixer, pseudo stereo, surround, p 2 bass, sas,12-band parametric eq, master volume, l/r balance, compression, post- scaler, output signal clipper (p 2 bass and sas are rohm?s own sound effect functions.) applications flat panel tvs (lcd, plasma) no.12083eat01
technical note 2/34 bu9406ks2 www.rohm.com 2012.03 - rev. a ? 2012 rohm co., ltd. all rights reserved.
technical note 3/34 bu9406ks2 www.rohm.com 2012.03 - rev. a ? 2012 rohm co., ltd. all rights reserved. ? ?
technical note 4/34 bu9406ks2 www.rohm.com 2012.03 - rev. a ? 2012 rohm co., ltd. all rights reserved. ? ?
technical note 5/34 bu9406ks2 www.rohm.com 2012.03 - rev. a ? 2012 rohm co., ltd. all rights reserved.
technical note 6/34 bu9406ks2 www.rohm.com 2012.03 - rev. a ? 2012 rohm co., ltd. all rights reserved.
technical note 7/34 bu9406ks2 www.rohm.com 2012.03 - rev. a ? 2012 rohm co., ltd. all rights reserved. 1. command interface bu9406ks2 uses the i 2 c bus format for the command interface with the host cpu. with bu9406ks2, in addition to write mode, read mo de read-out is possible with many registers. bu9406ks2 assigns a 1-byte select address in addition to the slave address and performs write-in and read-out. the i 2 c bus slave mode format is as follows: msb lsb msb lsb msb lsb s slave address a select address a data a p s: start condition slave address: adds either a read mode (h?) or write mode (l?) bit to the slave address (7bit) configured by i2cadr1 and i2cadr2, sending a total of 8 bits of data. (msb first) a: acknowledge an acknowledge bit is added on to each bit of data transmitted. when data transmission is being done correctly, ?l? is transmitted. ?h? transmission means there was no acknowledge. select address: bu9406ks2 uses a 1-byte select address. (msb first) data: data byte, transmitted data (msb first) p: stop condition 1 1 - - 1 1 . . d d a a t t a a w w r r i i t t e e - - i i n n s slave address a select address a data a p : master to slave : slave to master msb sda scl msb 6 5 lsb start condition when sda , scl=h stop condition when sda , scl=h
technical note 8/34 bu9406ks2 www.rohm.com 2012.03 - rev. a ? 2012 rohm co., ltd. all rights reserved. write-in procedure step clock master slave(bu9406ks2) note 1 start condition 2 7 slave address &h80 (&h82, &h84, &h86) 3 1 r/w (0) 4 1 acknowledge 5 8 select address write- in target register: 8bit 6 1 acknowledge 7 8 data 8bit write-in data 8 1 acknowledge 9 stop condition
technical note 9/34 bu9406ks2 www.rohm.com 2012.03 - rev. a ? 2012 rohm co., ltd. all rights reserved. 1 1 - - 3 3 . . t buf t low t r t hd;sta s p t hd;dat t f t high t su;dat t su;sta sr t hd;sta t su;sto p sda scl
technical note 10/34 bu9406ks2 www.rohm.com 2012.03 - rev. a ? 2012 rohm co., ltd. all rights reserved. 2. data and clock switching below is the in/output system diagram for bu9406ks2. bu9406ks2 has a 4-line digital stereo input, 1-line analog ster eo input, 4-line digital stereo output and 3-line analog stereo output. the digital data input to the dsp computing section is firs t changed to fs=48khz data at the asrc (asynchronous sampling rate converter). dsp computing section output is changed to either i 2 s format digital output, s/pdif format digital serial output or analog output. 2 2 - - 1 1 . . adc analog in s e l 1 sel9 i2s out a i2s out b func. main parame tric eq df2 df3 df1 ? dac1 ? dac2 16bit dac sp out line out dsp computing section this section is actualized by hardware. control i/f i2c ??? reset s e l 7 amclk in1 amclk in2 amclk in3 amclk in4 3-state amclk out a amclk out b sys clk cg dsp clk i2s in1 i2s in2 i2s in3 i2s in4 s e l 6 s-p conve rsion1 i2s i2s rec out evr p-s conve rsion1 pll2 pll1 s-p conve rsion2 audio dsp (bu9406ks2) agc p-s conve rsion2 i2s out c amclk out c s e l 2 spdif conver sion s/pdif i2s_in_sel1 i2s_in_ sel2 s e l 3 asrc s e l 11 sel10 sel8 ainl,ainr datai1,bcki1,lrcki1 amclki1 datai2,bcki2,lrcki2 datai3,bcki3,lrcki3 datai4,bcki4,lrcki4 amclki2 amclki3 amclki4s dataoc,bckoc,lrckoc dataoc,bckoc,lrckoc amclki4s aoutl3,aoutr3 aoutl2,aoutr2 aoutl1,aoutr1 amclkoa amclkob amclkoc dataoa, bckoa, lrckoa dataob, bckob, lrckob s e l 4 s e l 5
technical note 11/34 bu9406ks2 www.rohm.com 2012.03 - rev. a ? 2012 rohm co., ltd. all rights reserved. 2 2 - - 3 3 . .
technical note 12/34 bu9406ks2 www.rohm.com 2012.03 - rev. a ? 2012 rohm co., ltd. all rights reserved. 2 2 - - 8 8 . .
technical note 13/34 bu9406ks2 www.rohm.com 2012.03 - rev. a ? 2012 rohm co., ltd. all rights reserved. 2 2 - - 1 1 3 3 . .
technical note 14/34 bu9406ks2 www.rohm.com 2012.03 - rev. a ? 2012 rohm co., ltd. all rights reserved. 2 2 - - 2 2 0 0 . .
technical note 15/34 bu9406ks2 www.rohm.com 2012.03 - rev. a ? 2012 rohm co., ltd. all rights reserved. 3. s-p conversion 1 and s-p conversion 2 bu9406ks2 has two built-in serial-parallel conversion circuits. (s-p conversion 1 and s-p conversion 2) s-p conversions 1 and 2 are blocks which receive 3-line serial input audio data from pins and convert it to parallel data. input from datai1, bcki1 and lrcki1 (pins 52,53 and 54), datai2, bcki2 and lrcki2 (pins 55, 56, and 57), datai3, bcki3 and lrcki3 (pins 58, 63 and 64), and datai4, bcki4 and lrcki4 (pins 65, 66 and 67) are selected. the three input formats are iis, left-justified and right-justified. the bit clock frequency may be selected from either 64fs or 48fs, but when 48fs is selected, the input format is always right-justified. 16bit, 20bit and 24bit output may be selected for each format. below are the timing charts for each transfer format. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 16bit 20bit 24bit 16bit 20bit 24bit lrcki bcki datai iis format 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 16bit 20bit 24bit 16bit 20bit 24bit lrcki bcki datai left-justified format 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 16bit 20bit 24bit lrcki bcki datai right-justified format 16bit 20bit 24bit 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 16bit 20bit 24bit lrcko bcko datao 48fs 16bit 20bit 24bit msb lsb s msb lsb s msb lsb s msb lsb s msb lsb s msb lsb s msb lsb s msb lsb s
technical note 16/34 bu9406ks2 www.rohm.com 2012.03 - rev. a ? 2012 rohm co., ltd. all rights reserved. 3 3 - - 1 1 . .
technical note 17/34 bu9406ks2 www.rohm.com 2012.03 - rev. a ? 2012 rohm co., ltd. all rights reserved. 4. digital sound processing (dsp) bu9406ks2?s digital sound processing (dsp) section is cons tructed with specific hardware optimal for fpd tvs. bu9406ks2 uses this special dsp to perform the following processes: p p r r e e - - s s c c a a l l e e r r , , c c h h a a n n n n e e l l m m i i x x e e r r , , p p s s e e u u d d o o - - s s t t e e r r e e o o , , s s u u r r r r o o u u n n d d , , p p 2 2 b b a a s s s s , , p p 2 2 t t r r e e b b l l e e , , p p a a r r a a m m e e t t r r i i c c e e q q u u a a l l i i z z e e r r , , e e v v r r & & b b a a l l a a n n c c e e , , c c o o m m p p r r e e s s s s i i o o n n , , p p o o s s t t - - s s c c a a l l e e r r , , c c l l i i p p p p e e r r 4 4 - - 1 1 . . data ram mux m u x coefficient ram decoder circuit mux add acc input 0 output input pre- scaler compressi on pseudo stereo surround p2bass p2treble parametric eq evr balance clipper post- scaler output digital audio processing signal flow channel mixer -4db -6db command value gain 00 01 04 05 06 07 0db -2db -8db -10db -12db -14db 02 03 -20db -22db command value gain 08 09 0c 0d 0e 0f -16db -18db -24db -26db -28db -30db 0a 0b -36db -38db command value gain 10 11 14 15 16 17 -32db -34db -40db -42db -44db - 12 13 +12db +10db command value gain 18 19 1c 1d 1e 1f +16db +14db +8db +6db +4db +2db 1a 1b
technical note 18/34 bu9406ks2 www.rohm.com 2012.03 - rev. a ? 2012 rohm co., ltd. all rights reserved. 4 4 - - 3 3 . .
technical note 19/34 bu9406ks2 www.rohm.com 2012.03 - rev. a ? 2012 rohm co., ltd. all rights reserved. 4 4 - - 5 5 . .
technical note 20/34 bu9406ks2 www.rohm.com 2012.03 - rev. a ? 2012 rohm co., ltd. all rights reserved. surround gain configuration default = 0 select address oper ation description &h70 [ 3 command value gain 0 1 2 3 4 5 6 7 command value gain -2db -3db 0db -1db -6db -7db -4db -5db 8 9 a b c d e f -10db -11db -8db -9db -14db -15db -12db -13db
technical note 21/34 bu9406ks2 www.rohm.com 2012.03 - rev. a ? 2012 rohm co., ltd. all rights reserved. 4 4 - - 6 6 . . p p 2 2 b b a a s s s s ( ( p p e e r r f f e e c c t t p p u u r r e e b b a a s s s s : : d d e e e e p p b b a a s s s s e e q q u u a a l l i i z z e e r r ) ) the deep bass equalizer recreates dynamic bass and realisti c sound, even with fpd tvs which have limited speaker enclosure. it actualizes clear, heavy bass with low distortion. rich and natural bass is obtained, and the vocal range is not affected even when with bass boost. t urning p 2 bass function on/off default = 0 select address value operation description &h72 [ 7 ] 0 p 2 bass function off 1 p 2 bass function on p 2 bass hpf cut-off frequency configuration default = 0 select address value operation description &h72 [ 3 p 2 bass gain gain f hpf cut-off frequency lpf cut-off frequency vocal range command value gain 0 1 2 3 4 5 6 7 command value gain +8db +9db +6db +7db +12db +13db +10db +11db
technical note 22/34 bu9406ks2 www.rohm.com 2012.03 - rev. a ? 2012 rohm co., ltd. all rights reserved. 4 4 - - 7 7 . . command value gain 0 1 2 3 4 5 6 7 command value gain +3db +4db +1db +2db +7db +8db +5db +6db 8 9 a b c d e +11db +12db +9db +10db +15db +13db +14db
technical note 23/34 bu9406ks2 www.rohm.com 2012.03 - rev. a ? 2012 rohm co., ltd. all rights reserved. z -1 + + z -1 2b 29 28 z -1 z -1 2c 2a + + z -1 + + z -1 26 24 23 z -1 z -1 27 25 + + z -1 + + z -1 30 2e 2d z -1 z -1 31 2f + + z -1 + + z -1 35 33 32 z -1 z -1 36 34 + + z -1 + + z -1 3a 38 37 z -1 z -1 3b 39 + + z -1 + + z -1 6b 69 68 z -1 z -1 6c 6a + + z -1 + + z -1 3 1 0 z -1 z -1 4 2 + + z -1 + + z -1 8 6 5 z -1 z -1 9 7 + + 12345 67 filter number coefficient number z -1 + + z -1 d b a z -1 z -1 e c + + z -1 + + z -1 12 10 f z -1 z -1 13 11 + + z -1 + + z -1 17 15 14 z -1 z -1 18 16 + + z -1 + + z -1 1c 1a 19 z -1 z -1 1d 1b + + z -1 + + z -1 21 1f 1e z -1 z -1 22 20 + + 89a bc lch transition filter coefficient numbers and filter numbers are hexadecimal z -1 + + z -1 2b 29 28 z -1 z -1 2c 2a + + z -1 + + z -1 66 64 63 z -1 z -1 67 65 + + z -1 + + z -1 30 2e 2d z -1 z -1 31 2f + + z -1 + + z -1 35 33 32 z -1 z -1 36 34 + + z -1 + + z -1 3a 38 37 z -1 z -1 3b 39 + + z -1 + + z -1 6b 69 68 z -1 z -1 6c 6a + + z -1 + + z -1 43 41 40 z -1 z -1 44 42 + + z -1 + + z -1 48 46 45 z -1 z -1 49 47 + + 12345 67 filter number coefficient number z -1 + + z -1 4d 4b 4a z -1 z -1 4e 4c + + z -1 + + z -1 52 50 4f z -1 z -1 53 51 + + z -1 + + z -1 57 55 54 z -1 z -1 58 56 + + z -1 + + z -1 5c 5a 59 z -1 z -1 5d 5b + + z -1 + + z -1 61 5f 5e z -1 z -1 62 60 + + 89a bc rch(latter 7 bands and transit ion filter coefficients differ fr om lch transition filter coefficient number and fil ter numbers are hexadecimal
technical note 24/34 bu9406ks2 www.rohm.com 2012.03 - rev. a ? 2012 rohm co., ltd. all rights reserved. 4 4 - - 8 8 - - 1 1 . . -1db 0db 7e 0db - ff 0db - 0db -126db 0db 0db 0db 0db 0db 0db -1db -126db 80 7f 01 81 command value lch 00 fe balance configuration rch
technical note 25/34 bu9406ks2 www.rohm.com 2012.03 - rev. a ? 2012 rohm co., ltd. all rights reserved. 4 4 - - 1 1 0 0 . . agcontime agc_max agc_min agcofftime r_rate a_rate input volume
technical note 26/34 bu9406ks2 www.rohm.com 2012.03 - rev. a ? 2012 rohm co., ltd. all rights reserved. a_rate is the configuration for the speed of vo lume decrease. it is c onfigured at &h23[6:4]. default = 0 select address oper ation description &h23 [ 6
technical note 27/34 bu9406ks2 www.rohm.com 2012.03 - rev. a ? 2012 rohm co., ltd. all rights reserved. default = 0 select address value operation description &h26 [ 2 clip level
technical note 28/34 bu9406ks2 www.rohm.com 2012.03 - rev. a ? 2012 rohm co., ltd. all rights reserved. 5. p-s conversion 1 and p-s conversion 2 bu9406ks2 has two built-in parallel-serial conversion circuits (p-s conversion 1 and p-s conversion 2). p-s conversion 1 converts the output from the ad conv erter or asrc to 3-line serial data before sending it from dataoa, bckoa and lrckoa (pins 48, 49 and 51) or dataob, bckob and lrckob (pins 45, 46 and 47). (refer to &h08[6:4] and &h08[2:0]) p-s conversion 2 converts the asrc or dsp output into 3-line serial data before transmitting it from dataoc, bckoc and lrckoc (pins 42, 43 and 44). the system clock for p-s conversion 1 is configured at &h0a[5:4], however, wh en outputting an ad converter, sysclk should be selected. when outputting asrc, the same selection should be made as with &h0a[1:0]. the three output formats are iis, left-justified and right-justi fied. 16bit, 20bit and 24bit output can be selected for each format. the timing charts for each transfer format are as follows: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 16bit 20bit 24bit 16bit 20bit 24bit lrcko bcko datao iis format 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 16bit 20bit 24bit 16bit 20bit 24bit lrcko bcko datao left-justified format 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 16bit 20bit 24bit lrcko bcko datao right-justified format 16bit 20bit 24bit msb lsb s msb lsb s msb lsb s msb lsb s msb lsb s msb lsb s
technical note 29/34 bu9406ks2 www.rohm.com 2012.03 - rev. a ? 2012 rohm co., ltd. all rights reserved. 5 5 - - 1 1 . .
technical note 30/34 bu9406ks2 www.rohm.com 2012.03 - rev. a ? 2012 rohm co., ltd. all rights reserved. 6. 8x over-sampling digital filter (df) in each bu9406ks2 audio analog signal output dac, an 8x over-sam pling digital filter is inserted into the previous step of the dac input. in addition to filter calculations, this block also performs pre-scaler, volume and lch/rch mix functions. bu9406ks2?s df+dac configurations are as follows: 6 6 - - 1 1 . . 8x over-sampling filter 16bitdac aoutr1 (22pin) aoutl1 (23pin) df3 8x over-sampling filter ?dac aoutr2 (26pin) aoutl2 (30pin) df2 pre-scaler volume channel mixer 8x over-sampling filter ?dac aoutr3 (33pin) aoutl3 (37pin) df1 pre-scaler volume pre-scaler volume channel mixer channel mixer
technical note 31/34 bu9406ks2 www.rohm.com 2012.03 - rev. a ? 2012 rohm co., ltd. all rights reserved. 6 6 - - 3 3 . .
technical note 32/34 bu9406ks2 www.rohm.com 2012.03 - rev. a ? 2012 rohm co., ltd. all rights reserved. 7. c c o o m m m m a a n n d d s s t t r r a a n n s s m m i i t t t t e e d d a a f f t t e e r r r r e e s s e e t t r r e e l l e e a a s s e e (1) the following commands must be transmitted after rese t release, including after power supply stand-up. 0
technical note 33/34 bu9406ks2 www.rohm.com 2012.03 - rev. a ? 2012 rohm co., ltd. all rights reserved.
technical note 34/34 bu9406ks2 www.rohm.com 2012.03 - rev. a ? 2012 rohm co., ltd. all rights reserved. 0.5 bu9406ks2 60 40 80 61 41 20 21 1 14.0 0.2 16.0 0.3 14.0 0.2 16.0 0.3 lot no. 1.4 0.1 0.10.1 0.1 0.3 0.1 0.65 0.125 0.1 (unit : mm) sqfp-t80c 0.1 14.00.2 0.1250.1 0.65 0.30.1 16.00.3 80 61 1 20 21 40 41 60 14.00.2 1.40.1 0.5 16.00.3 0.10.1 ? order quantity needs to be multiple of the minimum quantity. tray (with dry pack) container quantity direction of feed 500pcs direction of product is fixed in a tray 1pin
datasheet d a t a s h e e t notice - ge rev.002 ? 2014 rohm co., ltd. all rights reserved. notice precaution on using rohm products 1. our products are designed and manufac tured for application in ordinary elec tronic equipments (such as av equipment, oa equipment, telecommunication equipment, home electroni c appliances, amusement equipment, etc.). if you intend to use our products in devices requiring ex tremely high reliability (such as medical equipment (note 1) , transport equipment, traffic equipment, aircraft/spacecra ft, nuclear power controllers, fuel c ontrollers, car equipment including car accessories, safety devices, etc.) and whose malfunction or failure may cause loss of human life, bodily injury or serious damage to property (?specific applications?), please consult with the rohm sale s representative in advance. unless otherwise agreed in writing by rohm in advance, ro hm shall not be in any way responsible or liable for any damages, expenses or losses incurred by you or third parties arising from the use of any ro hm?s products for specific applications. (note1) medical equipment classification of the specific applications japan usa eu china class class class b class class class 2. rohm designs and manufactures its products subject to strict quality control system. however, semiconductor products can fail or malfunction at a certain rate. please be sure to implement, at your own responsibilities, adequate safety measures including but not limited to fail-safe desi gn against the physical injury, damage to any property, which a failure or malfunction of our products may cause. the following are examples of safety measures: [a] installation of protection circuits or other protective devices to improve system safety [b] installation of redundant circuits to reduce the impact of single or multiple circuit failure 3. our products are designed and manufactured for use under standard conditions and not under any special or extraordinary environments or conditio ns, as exemplified below. accordin gly, rohm shall not be in any way responsible or liable for any damages, expenses or losses arising from the use of an y rohm?s products under any special or extraordinary environments or conditions. if you intend to use our products under any special or extraordinary environments or conditions (as exemplified bel ow), your independent verification and confirmation of product performance, reliability, etc, prior to use, must be necessary: [a] use of our products in any types of liquid, incl uding water, oils, chemicals, and organic solvents [b] use of our products outdoors or in places where the products are exposed to direct sunlight or dust [c] use of our products in places where the products ar e exposed to sea wind or corrosive gases, including cl 2 , h 2 s, nh 3 , so 2 , and no 2 [d] use of our products in places where the products are exposed to static electricity or electromagnetic waves [e] use of our products in proximity to heat-producing components, plastic cords, or other flammable items [f] sealing or coating our products with resin or other coating materials [g] use of our products without cleaning residue of flux (ev en if you use no-clean type fluxes, cleaning residue of flux is recommended); or washing our products by using water or water-soluble cleaning agents for cleaning residue after soldering [h] use of the products in places subject to dew condensation 4. the products are not subjec t to radiation-proof design. 5. please verify and confirm characteristics of the final or mounted products in using the products. 6. in particular, if a transient load (a large amount of load applied in a short per iod of time, such as pulse. is applied, confirmation of performance characteristics after on-boar d mounting is strongly recomm ended. avoid applying power exceeding normal rated power; exceeding the power rating under steady-state loading c ondition may negatively affect product performance and reliability. 7. de-rate power dissipation (pd) depending on ambient temper ature (ta). when used in seal ed area, confirm the actual ambient temperature. 8. confirm that operation temperat ure is within the specified range descr ibed in the product specification. 9. rohm shall not be in any way responsible or liable for fa ilure induced under deviant condi tion from what is defined in this document. precaution for mounting / circuit board design 1. when a highly active halogenous (chlori ne, bromine, etc.) flux is used, the resi due of flux may negatively affect product performance and reliability. 2. in principle, the reflow soldering method must be used; if flow soldering met hod is preferred, please consult with the rohm representative in advance. for details, please refer to rohm mounting specification
datasheet d a t a s h e e t notice - ge rev.002 ? 2014 rohm co., ltd. all rights reserved. precautions regarding application examples and external circuits 1. if change is made to the constant of an external circuit, pl ease allow a sufficient margin c onsidering variations of the characteristics of the products and external components, including transient characteri stics, as well as static characteristics. 2. you agree that application notes, re ference designs, and associated data and in formation contained in this document are presented only as guidance for products use. theref ore, in case you use such information, you are solely responsible for it and you must exercise your own independent verification and judgment in the use of such information contained in this document. rohm shall not be in any way responsible or liable for any damages, expenses or losses incurred by you or third parties arising from the use of such information. precaution for electrostatic this product is electrostatic sensitive product, which may be damaged due to electrostatic discharge. please take proper caution in your manufacturing process and storage so that voltage exceeding t he products maximum rating will not be applied to products. please take special care under dry condit ion (e.g. grounding of human body / equipment / solder iron, isolation from charged objects, se tting of ionizer, friction prevention and temperature / humidity control). precaution for storage / transportation 1. product performance and soldered connections may deteriora te if the products are stor ed in the places where: [a] the products are exposed to sea winds or corros ive gases, including cl2, h2s, nh3, so2, and no2 [b] the temperature or humidity exceeds those recommended by rohm [c] the products are exposed to di rect sunshine or condensation [d] the products are exposed to high electrostatic 2. even under rohm recommended storage c ondition, solderability of products out of recommended storage time period may be degraded. it is strongly recommended to confirm sol derability before using products of which storage time is exceeding the recommended storage time period. 3. store / transport cartons in the co rrect direction, which is indicated on a carton with a symbol. otherwise bent leads may occur due to excessive stress applied when dropping of a carton. 4. use products within the specified time after opening a hum idity barrier bag. baking is required before using products of which storage time is exceeding the recommended storage time period. precaution for product label qr code printed on rohm products label is for rohm?s internal use only. precaution for disposition when disposing products please dispose them proper ly using an authorized industry waste company. precaution for foreign exchange and foreign trade act since our products might fall under cont rolled goods prescribed by the applicable foreign exchange and foreign trade act, please consult with rohm representative in case of export. precaution regarding intellectual property rights 1. all information and data including but not limited to application example contain ed in this document is for reference only. rohm does not warrant that foregoi ng information or data will not infringe any intellectual property rights or any other rights of any third party regarding such information or data. rohm shall not be in any way responsible or liable for infringement of any intellectual property rights or ot her damages arising from use of such information or data.: 2. no license, expressly or implied, is granted hereby under any intellectual property rights or other rights of rohm or any third parties with respect to the information contained in this document. other precaution 1. this document may not be reprinted or reproduced, in whol e or in part, without prior written consent of rohm. 2. the products may not be disassembled, converted, modified, reproduced or otherwise changed without prior written consent of rohm. 3. in no event shall you use in any wa y whatsoever the products and the related technical information contained in the products or this document for any military purposes, incl uding but not limited to, the development of mass-destruction weapons. 4. the proper names of companies or products described in this document are trademarks or registered trademarks of rohm, its affiliated companies or third parties.
datasheet datasheet notice ? we rev.001 ? 2014 rohm co., ltd. all rights reserved. general precaution 1. before you use our pro ducts, you are requested to care fully read this document and fully understand its contents. rohm shall n ot be in an y way responsible or liabl e for fa ilure, malfunction or acci dent arising from the use of a ny rohms products against warning, caution or note contained in this document. 2. all information contained in this docume nt is current as of the issuing date and subj ec t to change without any prior notice. before purchasing or using rohms products, please confirm the la test information with a rohm sale s representative. 3. the information contained in this doc ument is provi ded on an as is basis and rohm does not warrant that all information contained in this document is accurate an d/or error-free. rohm shall not be in an y way responsible or liable for an y damages, expenses or losses incurred b y you or third parties resulting from inaccur acy or errors of or concerning such information.
datasheet part number bu9406ks2 package sqfp-t80c unit quantity 500 minimum package quantity 50 packing type tray constitution materials list inquiry rohs yes bu9406ks2 - web page distribution inventory

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