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1/15 www.rohm.com 2010.10 - rev . a ? 2010 rohm co., ltd. all rights reserved. sound processors for boom box / mini-component s t ereo sound processors with built-in 2-band equalizers bd3870fs,bd3871fs, bd3872f s,bd3873fs description the sound processor with built-in 2 band equalizer, incorpor ates functions required for boom box and mini-component systems, such as input selector, input gain amp, volume, surround, tone (bass, treble), and loud speaker equalizer (bd3872fs only). these functions can be controlled through the two-wire serial control. f eat ures 1) using external components, center frequencies and q factors of the bass characteristics are flexible. 2) providing a mute switch onto one of the input pins allows cross-talk suppression. 3) a surround function can be constr ucted without external components. 4) energy-saving design resulting in low current consumption, by utiliz ing the bicmos process ap pli c ati ons boom box, mini-audio system s, and micro-audio systems. li ne up matr ix parameter bd3870fs bd3871fs bd3873fs bd3872fs input gain 0, 6, 12, 18db 24, 26, 28db 18, 21, 24, 27db 0, 5, 10, 19, 21, 23, 26, 28db loud speaker equalizer (seq) no no no yes input selector three inputs three inputs three inputs five inputs volume 0 to -87db/ 1db step, - ? db 0 to -87db/ 1db step, - ? db 0 to C87db/ 1db step, - ? db 0 to -87db/ 1db step, - ? db equalizer 2 band (bass, treble) 2 band (bass, treble) 2 band (bass, treble) 2 band (bass, treble) surround yes yes yes yes serial control two-wire serial two-wire serial two-wire serial two-wire serial package ssop-a24 ssop-a2 4 ssop-a24 ssop-a32 abs o lute maxim u m ratings (ta=25 ) prameter symbol ratings unit bd3870fs bd3871fs bd3873fs bd3872fs power supply voltage vcc 10 10 10 10 v power dissipation pd 800 * 1 800 * 1 800 * 1 950 * 2 mw operating temperature range topr -25 to +75 -25 to +75 -25 to +75 -25 to +75 storage temperature range tstg -55 to +125 -55 to +125 -55 to +125 -55 to +125 * 1 reduced by 8.0 mw/ at 25 or higher, when installed on the standard board (size: 70 70 1.6mm). * 2 reduced by 9.5 mw/ at 25 or higher, when installed on the standard board (size: 70 70 1.6mm). o per atin g volt ag e ran ge prameter symbol ratings unit bd3870fs bd3871fs bd3873fs bd3872fs operating voltage range vcc 4.5 to 9.5 4.5 to 9.5 4.5 to 9.5 4.5 to 9.5 v *it must function normally at ta=25 . no.10086eat02 downloaded from: http:///
technical note 2/15 www.rohm.com 2010.10 - rev . a ? 2010 rohm co., ltd. all rights reserved. bd3870fs,bd3871f s, bd3872f s,bd3873fs electrical character i stics (ta=25 , vcc=8v, f=1khz, vi=200mvrms, rl=10k ? , rg=600 ? , input gain=0db (bd3870fs, bd3872fs only), input gain=24db (bd3871fs only), input gain=18d b (bd3873fs only),volume=0db, bass=0db, treble=0db, surround=off, loud speaker equalizer=off (bd3872fs only), unless otherwise noted) block parameter symbol limits unit condition min. typ. max. to ta l circuit current iq - 8 21 ma at no signal total output voltage gain gv -2 0 2 db bd3870fs, bd3872fs gv=20log(vout/vin) 22 24 26 bd3871fs gv=20log(vout/vin) 16 18 20 bd3873fs gv=20log(vout/vin) total harmonic distortion ratio thd - 0.01 0.1 % bw=400 to 30khz maximum output voltage vom 1.6 2.1 - vrms thd=1% bw=400 to 30khz total output noise voltage vno - 4.5 15 vrms bd3870fs, bd3872fs rg=0 ? , bw=ihf-a - 40 80 bd3871fs, bd3873fs rg=0 ? , bw=ihf-a total residual noise voltage vmno - 4.5 15 vrms rg=0 ? , bw=ihf-a volume=- ? db cross-talk between channels ctc - -80 -70 db rg=0 ? , bw=ihf-a vout=1vrms cross-talk between selectors cts - -80 -70 db rg=0 ? , bw=ihf-a input impedance rin 35 50 65 k ? bd3870fs, bd3871fs, bd3873fs 70 100 130 bd3872fs output impedance rout - - 50 ? volume volume control range vri -90 -87 -84 db vr=20log(vout/vin) maximum volume attenuation vmin - - -90 db bw=ihf-a volume input impedance rvin 39 56 73 k ? bass bass boost gain gbb 12 14 16 db gb=20log(vout/vin) bass cut gain gbc -16 -14 -12 db gb=20log(vout/vin) bass step resolution br - 2 - db treble treble boost gain gtb 10 12 14 db bd3870fs, bd3871fs, bd3873fs 12 14 16 bd3872fs treble cut gain gtc -14 -12 -10 db bd3870fs, bd3871fs, bd3873fs -16 -14 -12 bd3872fs treble step resolution tr - 2 - db surround surround in-phase gain vsur1 -2 0 2 db 2ch in-phase inputs surround single-phase gain vsur2 4.3 6.3 8.3 db 1ch input, 1ch grounded surround opposite-phase gain vsur3 8 10 12 db 2ch opposite-phase inputs seq loud speaker equalizer gain (bd3872fs only) seq 3 5 7 db f=10khz * for measurement, vp-9690a (average value wave detection, effectiv e value display) ihf-a filter by matsushita communication in dustrial is used. * phase relation between input/output signal terminals is the same. * note: this ic is not designed to be radiation-resistant. downloaded from: http:///
technical note 3/15 www.rohm.com 2010.10 - rev . a ? 2010 rohm co., ltd. all rights reserved. bd3870fs,bd3871f s, bd3872f s,bd3873fs sc (clock) thd thd th ts ts1 th1 tsd twc twh twd tw1 tsu data data latch 90% 90% 90% 90% 10% 10% 10% 90% 90% 90% 90% 90% 10% 10% 10% twc end with low si data latch ti mi ng ch art 1) signal timing conditions ? data is read on the rising edge of the clock. ? latch is read out on the fa lling edge of the clock. ? latch signal must end with the low state. ? to avoid malfunctions, clock and data signals must terminate with the low state. 1byte=10bit fig.1 parameter symbol limits unit min. typ. max. minimum clock width twc 2.0 - - s minimum data width twd 2.0 - - s minimum latch width tw1 2.0 - - s data set-up time (data ? clk) tsd 1.0 - - s data hold time (clk ? data) thd 1.0 - - s latch set-up time (clk ? latch) ts1 1.0 - - s latch hold time (data ? latch) th1 1.0 - - s latch low set-up time ts 1.0 - - s latch low hold width twh 2.0 - - s 2) voltage conditions for control signals parameter limits unit condition min. typ. max. ( Q vcc) h input voltage 2.2 - 5.5 v vcc=4.5 to 9.5v l input voltage 0 - 1.0 v vcc=4.5 to 9.5v downloaded from: http:///
technical note 4/15 www.rohm.com 2010.10 - rev . a ? 2010 rohm co., ltd. all rights reserved. bd3870fs,bd3871f s, bd3872f s,bd3873fs 3) control data format list basic configuration of control data format ? data input direction msb lsb d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 data select address control data format (bd3870fs, bd3871fs, bd3873fs) ? data input direction d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 (1) input selector input gain surround * * * 0 0 (2) volume a volume b * 0 1 (3) bass gain treble gain 1 0 (4) * * * * * * * * 1 1 control data format (bd3872fs) ? data input direction d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 (1) input gain input selector * * 0 0 (2) volume a volume b * 0 1 (3) bass gain treble gain 1 0 (4) * * * * * * surround seq 1 1 ? * indicates 0 or 1. ? by changing the setting of select address, three or four different control formats (bd3871fs, bd3872fs, bd3873fs, plus bd3872fs) are selectable. ? in every power-on sequence, all of the address data must be initialized. example: input direction msb lsb msb lsb msb lsb msb lsb data(1) l data(2) l data(3) l data(4) l l indicates a latch. ? after power-on, for the second and subsequent times, only the necessary data can be selected for setting. example: when changing the volume, input direction msb lsb data(2) l l indicates a latch. downloaded from: http:///
technical note 5/15 www.rohm.com 2010.10 - rev . a ? 2010 rohm co., ltd. all rights reserved. bd3870fs,bd3871f s, bd3872f s,bd3873fs bl ock di agr am, ap pl icati on cir c uit, p i n ass i g n me nt (bd3870fs, bd3871fs, bd3873fs) unit: resistance = ? , capacitor = f fig.2 pi n descr ipt i o n (bd3870fs, bd3871fs, bd3873fs) pin no. pin name description pin no. pin name description 1 vin1 1ch volume input pin 13 sc serial clock input pin 2 vin2 2ch volume input pin 14 si serial data input pin 3 sel2 2ch input selector output pin 15 vcc power supply pin 4 sel1 1ch input selector output pin 16 out2 2ch output pin 5 a1 1ch input pin a 17 out1 1ch output pin 6 a2 2ch input pin a 18 bout1 1ch bass filter setting pin 7 b1 1ch input pin b 19 bnf1 1ch bass filter setting pin 8 b2 2ch input pin b 20 bout2 2ch bass filter setting pin 9 c1 1ch input pin c 21 bnf2 2ch bass filter setting pin 10 c2 2ch input pin c 22 tnf2 2ch treble filter setting pin 11 filter 1/2 vcc pin 23 tnf1 1ch treble filter setting pin 12 gnd ground pin 24 cap time constant setting pin for absorbing surround switching shock sound 5.6k 5.6k surround 13 14 15 16 17 18 19 20 21 22 23 24 12 11 10 9 8 7 6 5 4 3 2 1 treble1 fc=8k hz treble fc=8khz bass2 f 0 =80hz bass1 f 0 =80hz logic vcc/2 vcc/ 2 vcc/2 vcc/2 vcc/2 0db -87db - 50k 50k 50k 50k 50k 50k 10 10 47 10 10 10 10 10 10 4.7k 4.7k a1 a 2 b1 b 2 c1 c2 clock data latch vcc out2 out1 10 10 390k 390 k 0.1 0.1 0.1 0.1 0.0022 0.0022 0.33 downloaded from: http:///
technical note 6/15 www.rohm.com 2010.10 - rev . a ? 2010 rohm co., ltd. all rights reserved. bd3870fs,bd3871f s, bd3872f s,bd3873fs bl ock di agr am, ap pl icati on cir c uit, p i n ass i g n me nt (bd3872fs) unit: resistance = ? , capacitor = f fig.3 application to cinema surround e2 + 10 e1 d2 d1 c2 c1 clock data latch vcc out2 out1 0.0022 390k + 4.7 + 4.7 0.1 0.1 5.6k 0.1 0. 1 5.6k 390k 17 18 19 20 21 22 23 24 25 26 27 28 16 15 14 13 12 0.0022 3 2 1 29 30 31 32 11 10 9 8 7 6 5 4 0.22 0. 1 b2 b1 a 2 a 1 0.1 0.1 0.1 0.1 0.1 0. 1 0. 1 0.1 0.1 4.7k 4.7k 0.33 0.022 0. 001 0. 001 0.22 treble1 fc=10khz treble2 fc=10khz bass1 f 0 =80hz bass2 f 0 =80hz logic vcc/2 vcc/2 100k 100k 100k 100k 100k 100k 100k 100k 100k 100k vcc/2 vcc/2 surround loud speaker loud speaker equalizer2 0db -8 7db - vcc/2 0db -87db - 62k vcc/2 vcc/2 downloaded from: http:///
technical note 7/15 www.rohm.com 2010.10 - rev . a ? 2010 rohm co., ltd. all rights reserved. bd3870fs,bd3871f s, bd3872f s,bd3873fs unit: resistance = ? , capacitor = f fig.4 application to loud speaker equalizer e2 + 10 e1 d2 d1 c2 c1 clock data latch vcc out2 out1 0.0022 390k + 4.7 + 4. 7 0.1 0.1 5. 6k 0.1 0. 1 5.6k 390k 17 18 19 20 21 22 23 24 25 26 27 28 16 15 14 13 12 0.0022 3 2 1 29 30 31 32 11 10 9 8 7 6 5 4 0.22 0. 1 b2 b1 a 2 a 1 0.1 0. 1 0.1 0.1 0.1 0. 1 0. 1 0.1 0.1 4.7k 4.7k 0.33 0.01 0.33 0.01 0.33 0.22 treble1 fc=10khz treble fc=10khz bass1 f 0 =8 0hz bass2 f 0 =80hz logic vcc/2 vcc/2 100k 100k 100k 100k 100k 100k 100k 100k 100k 100k vcc/2 vcc/2 surround loud speaker equalizer1 loud speaker equalizer2 0db -87db - vcc/2 0db -87db - downloaded from: http:///
technical note 8/15 www.rohm.com 2010.10 - rev . a ? 2010 rohm co., ltd. all rights reserved. bd3870fs,bd3871f s, bd3872f s,bd3873fs pi n descr ipt i o n (bd3872fs) pin no. pin name description pin no. pin name description 1 vin1 1ch volume input pin 17 sc serial clock input pin 2 sel1 1ch input selector output pin 18 si serial data input pin 3 vin2 2ch volume input pin 19 vcc power supply pin 4 sel2 2ch input selector output pin 20 cap time constant setting pin for absorbing switching shock sound 5 a1 1ch input pin a 21 out2 2ch output pin 6 a2 2ch input pin a 22 out1 1ch output pin 7 b1 1ch input pin b 23 bout2 2ch bass filter setting pin 8 b2 2ch input pin b 24 bnf2 2ch bass filter setting pin 9 c1 1ch input pin c 25 bout1 1ch bass filter setting pin 10 c2 2ch input pin c 26 bnf1 1ch bass filter setting pin 11 d1 1ch input pin d 27 tnf2 2ch treble filter setting pin 12 d2 2ch input pin d 28 tnf1 1ch treble filter setting pin 13 e1 1ch input pin e 29 sout2 2ch cinema surround or seq setting pin 14 e2 2ch input pin e 30 sqi2 2ch cinema surround or seq setting pin 15 filter 1/2 vcc pin 31 sout1 1ch cinema surround or seq setting pin 16 gnd ground pin 32 sqi1 1ch cinema surround or seq setting pin downloaded from: http:///
technical note 9/15 www.rohm.com 2010.10 - rev . a ? 2010 rohm co., ltd. all rights reserved. bd3870fs,bd3871f s, bd3872f s,bd3873fs c1 c2 r3 r4 in r1 +- r2 ?? hz r4 r3 r2 c1c2 r4 r3 r1r2 2 1 f 0 ? ? ? ? ?? c2 c1 r1 r4 r3 r2 r1r2r4c1c2 q ? ? ? ? ?? ?? ?? db 1 c1 c2 r4 r3 r2 r1 r2r3 1 c1 c2 r4 r3 r2 r1 r4 r3 r2 20log g(boost) ? ? ? ? ? ? ? ? ? ? de scri p tio n of o per ati ons 1) bass filter using external components, center frequencies and q factors of the bass characteristics are flexible fig.5 standard values of r3, r4 (reference) (r1=5.6k ? , r2=390k ? , c1=c2=0.1f) bass boost cut amount resistance (k ? ) * typ. r3 r4 0db 77.64 0 2db 58.90 18.73 4db 44.02 33.60 6db 32.20 45.42 8db 22.82 54.80 10db 15.36 62.26 12db 9.44 68.18 14db 4.78 72.84 * the actual boost cut amount may deviate from the standard values in some degree. ?? ?? [ [ [ [ db) 1 c1 c2 r4 r3 r2 r1 r4 r2(r3 1 c1 c2 r4 r3 r2 r1 r2r3 20log cut g ? ? ? ? ? ? ? ? ? ? fig.6 g f f0 g g downloaded from: http:///
technical note 10/15 www.rohm.com 2010.10 - rev . a ? 2010 rohm co., ltd. all rights reserved. bd3870fs,bd3871f s, bd3872f s,bd3873fs 2) treble filter fig.7 standard values of r1, r2 (reference) treble boost cut amount resistance (k ? ) * typ. r1 r2 0db 0 36.28 2db 7.46 28.82 4db 13.39 22.89 6db 18.10 18.18 8db 21.84 14.44 10db 24.81 11.47 12db 27.20 9.08 14db (bd3872fs only) 29.04 7.24 * the actual boost cut amount may deviate from the standard values in some degree. 3) matrix surround fig.9 matrix surround is constructed as shown above. gains are defined as follows: in-phase gain: gains obtained on out1 and out2 against in1 when inputting a signal of the equivalent level and in-phase (l=r) to in1 and in2. 1 l l 2 2.14 l 2 4.14 in2 out2 in1 out1 ? ? ? ? ?? ? ?? ? (db) 0 20log1 ? single-phase gain: gains obtained on out1 and out2 against in1 when inputting a signal to in1 and ac-grounding in2 (r=0). 2,07 l l 2 4.14 in1 out1 ? ? 1.07 l l 2 2.14 in1 out2 ?? ?? (db) 6.3 20log2.07 ? (db) 0.59 1.07 20log ? ? opposite-phase gain: gains obtained on out1 and out2 against in1 when inputting signals of the equivalent level and opposite-phase (l-r) to in1 and in2. fc = (hz) g (boost) = 20log (db) g (cut) = 20log (db) zc = ( ? ) 2 r2c 1 r2+zc r1+r2+zc r1+r2+zc r2+zc j c 1 r2 in out c + - r1 + + - 1/2 1/2 + l r in1 in2 + - 2.14 (4.14l/2 - 2.14r/2) out1 out2 (4.14r/2 - 2.14l/2) + + + 3.14 l l 2 2.14 l 2 4.14 in2 out2 in1 out1 ? ? ? ? ?? ? ?? ? (db) 10 20log3.14 ? fig.8 g f fc g 3db g 3db downloaded from: http:///
technical note 11/15 www.rohm.com 2010.10 - rev . a ? 2010 rohm co., ltd. all rights reserved. bd3870fs,bd3871f s, bd3872f s,bd3873fs 1) sound generation using loud speaker equalizer (bd3872fs) using external components, one of the following two functions can be established; one having an effect to localize the vocal forward and enhance it (loud speaker equalizer) and t he other having an effect to clarify the vocal quality and improve the articulation index (cinema surround). those characteristic values can be adjusted by choosing the external components with desirable constants. details of above two functions are described below: cinema surround constructing the external components as shown below allows the vocals to be moved forward and enhanced. surround effect with enhanced vocal is achieved by turning on the built-in surround simultaneously. merging this effect, while playing movies on a dvd player, will make vocal listening clearer and surround effect more impactful. fig.10 loud speaker equalizer (seq) boom box and micro-sound systems are oft en restricted to using small-diameter speakers because of location space. these speakers, where the vocal range are attenuated, may give an impression of having a muffled vocal sound with respect to its audibility. using the loud speaker equalizer, the vocal quality which degrades in small-diameter speakers, can be improved and the arti culation index is also increased. fig.11 ? c1 can be selected to determine the fre quency where the phase should be inverted. c1 frequency where the phase is inverted larger value set to the lower frequency side smaller value set to the higher frequency side ? c2 can be selected to determine the hpf cut-off frequency fc. the seq gain remains constant. 1 fc = (hz) 2 ? rc (where r is a built-in resistance of 10k ? ) fig.12 32 loud speaker equalizer1 loud speaker equalizer2 31 30 29 hpf c2 sout (29. 31pin) phase shifter c1 seq (30, 32pin) in out gain frequency fc g=5db (constant) 3db downloaded from: http:///
technical note 12/15 www.rohm.com 2010.10 - rev . a ? 2010 rohm co., ltd. all rights reserved. bd3870fs,bd3871f s, bd3872f s,bd3873fs 0 2 4 6 8 10 10 100 1000 10000 100000 frequency (hz) gain (db) 4 6 8 0246810 vcc (v) icc (ma) 0.001 0.01 0.1 1 10 0.001 0.01 0.1 1 10 input voltage (vrms) output voltage (vrms) 0.001 0.01 0.1 1 10 0.001 0.01 0.1 1 10 input voltage (vrms) thd+n (%) 10 12 14 16 18 20 10 100 1000 10000 100000 frequency (hz) gain (db) 0 5 10 15 20 25 30 10 100 1000 10000 100000 frequency (hz) gain (db) -15 -10 -5 0 5 10 15 10 100 1000 10000 100000 frequency (hz) gain (db) -15 -10 -5 0 5 10 15 10 100 1000 10000 100000 frequency (hz) gain (db) 0 5 10 15 20 10 100 1000 10000 100000 frequency (hz) gain (db) -14 +14db 2db step ref e re nce dat a fig.13 circuit current - power supply voltage fig.14 output voltage - input voltage (bd3870fs) fig.15 total harmonic distortion ratio - input voltage (bd3870fs) fig.16 current gain - frequency (bd3870fs, bd3873fs) fig.17 voltage gain - frequency (bd3871fs) fig.18 bass gain - frequency at 18db setting at 24db setting +14db -14 +14db 2db step fig.19 treble gain - frequency (bd3870fs,bd3871fs,bd3873fs) fig.20 treble gain - frequency (bd3872fs) fig.21 surround gain - frequency -15 -10 -5 0 5 10 15 10 100 1000 10000 100000 frequency (hz) gain (db) at oppoite-phase input fig. 22 treble gain - frequency (bd3872fs) -14db +14db -14db +12db -12db -12 +12db 2db step downloaded from: http:///
technical note 13/15 www.rohm.com 2010.10 - rev . a ? 2010 rohm co., ltd. all rights reserved. bd3870fs,bd3871f s, bd3872f s,bd3873fs not e s for use 1) numbers and data in entries are representative design values and are not guaranteed values of the items. 2) although rohm is confident that the example application circuit reflects the best possible recommendations, be sure to verify circuit characteristics for your particular application. modification of constants for other externally connected circui ts may cause variations in both static and trans ient characteristics for external compo nents as well as this rohm ic. allow for sufficient margins when determining circuit constants. 3) absolute maximum ratings use of the ic in excess of absolute maximum ratings, such as the applied voltage or operating temperature range (topr), may result in ic damage. assumptions should not be made r egarding the state of the ic (short mode or open mode) when such damage is suffered. a physical safety measure, such as a fuse, should be implemented when using the ic at times where the absolute maximum ratings may be exceeded. 4) gnd potential ensure a minimum gnd pin potential in all operating conditions. ma ke sure that no pins are at a voltage below the gnd at any time, regardless of whether it is a transient signal or not. 5) thermal design perform thermal design, in which there ar e adequate margins, by taking into account the permissible dissipation (pd) in actual states of use. 6) short circuit between terminals and erroneous mounting pay attention to the assembly direction of the ics. wrong m ounting direction or shorts betw een terminals, gnd, or other components on the circuits, can damage the ic. 7) operation in strong electromagnetic field using the ics in a strong electromagnetic field can cause operation malfunction. 8) power-on reset a built-in circuit for performing initialization inside the ic at power-on is provided. in unstable systems it is recommended that the data shall be sent to all the addresses during powe r-on, until this operation cycle is completed. mute should be applied during this cycle. function initial condition input selector input a input gain 0db loud speaker equalizer (bd3872fs only) off volume - ? db surround off treble gain 0db bass gain 0db 9) 2-wire serial control for the cl and da terminals, the patterned and other wirings should be routed as not to cause interference with the analog-signal-related lines. 10) switching between functions shock sound is absorbed when switching between the volume, bass, and treble functions. 11) input coupling capacitor as described in the figure below, low frequency characterist ics are determined depending on the external capacitor value for input coupling, and the input impedance value inside the ic. fig.23 fig.24 f g 0 a (f) c r a(f) = 1+(2 fcr) 2 (2 fcr) 2 downloaded from: http:///
technical note 14/15 www.rohm.com 2010.10 - rev . a ? 2010 rohm co., ltd. all rights reserved. bd3870fs,bd3871f s, bd3872f s,bd3873fs 12) switching noise for surround and loud speaker equalizer (bd3872fs only), external capacitor c is attached to the cap pin as a measures to control the switching noise. in the appl ication circuit, a constant value as an ex ample, is indicated by the cap pin. the time constant, which is used to charge/discharge the external capacitor c (varying between vbe to 5vbe (2.65v)) on the cap pin, controls the soft swit ching operation. the switching ti me constant t is stated as t=2.55 10 5 c. vbe has a temperature characteristic and may affect the time constant t. 13) input selector and input gain when setting/changing input selector or input gain, the soft switching operation does not f unction and therefore noise is not controlled. for this reason, it is recommended to provide a mute circuit constructed of the external components for the set design. mute setting example fig.25 th erm a l d e rat i n g curv e fig.26 when installed rohm standard board (70 70 1.6mm glass epoxy board) 0 200 400 600 800 1000 1200 0 25 50 75 100 125 ambient temper atur e: ta( ) power dissipation : pd mw) ssop-a32 ssop-a24 mute (l=on, h=off) serial data input source serial data 40 60ms 500 600ms downloaded from: http:///
technical note 15/15 www.rohm.com 2010.10 - rev . a ? 2010 rohm co., ltd. all rights reserved. bd3870fs,bd3871f s, bd3872f s,bd3873fs or der in g p a rt num be r b d 3 8 7 0 f s - e 2 part no. part no. 3870,3871,3873 3872 package fs: ssop-a24 ssop-a32 packaging and forming specification e2: embossed tape and reel ? order quantity needs to be multiple of the minimum quantity. embossed carrier tape tapequantity 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 2000pcs e2 () direction of feed reel 1pin (unit : mm) ssop-a32 1 17 16 32 0.11 0.3min 0.36 0.1 0.8 13.6 0.2 0.15 0.1 5.4 0.2 7.8 0.3 1.8 0.1 (max 13.95 include burr) 0.1 ? order quantity needs to be multiple of the minimum quantity. embossed carrier tape tapequantity 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 2000pcs e2 () direction of feed reel 1pin (unit : mm) ssop-a24 24 0.1 0.1 12 0.8 4 +6 0.17 0.05 +0.1 13 1.8 0.1 4 0.38 0.1 1 10 0.2 0.5 0.2 1.2 0.15 7.8 0.3 5.4 0.2 (max 10.35 include burr) 0.1 downloaded from: http:///
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, 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 any ro hms 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 rohms 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 below), 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 described 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 downloaded from: http:///
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 considering 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 humidity 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 rohms 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 contained 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. downloaded from: http:///
datasheet datasheet notice C 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. downloaded from: http:///

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