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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 stereo sound processors with built-in 2-band equalizers bd3870fs,bd3871fs, bd3872fs,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. features 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 applications boom box, mini-audio system s, and micro-audio systems. line up matrix 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 ?87db/ 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 absolute maximum 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). operating voltage range 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
technical note 2/15 www.rohm.com 2010.10 - rev. a ? 2010 rohm co., ltd. all rights reserved. bd3870fs,bd3871f s,bd3872fs,bd3873fs electrical characteristics (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.
technical note 3/15 www.rohm.com 2010.10 - rev. a ? 2010 rohm co., ltd. all rights reserved. bd3870fs,bd3871f s,bd3872fs,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 timing chart 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. (Qvcc) ?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
technical note 4/15 www.rohm.com 2010.10 - rev. a ? 2010 rohm co., ltd. all rights reserved. bd3870fs,bd3871f s,bd3872fs,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.
technical note 5/15 www.rohm.com 2010.10 - rev. a ? 2010 rohm co., ltd. all rights reserved. bd3870fs,bd3871f s,bd3872fs,bd3873fs block diagram, application circuit, pin assignment (bd3870fs, bd3871fs, bd3873fs) unit: resistance = ? , capacitor = f fig.2 pin description (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
technical note 6/15 www.rohm.com 2010.10 - rev. a ? 2010 rohm co., ltd. all rights reserved. bd3870fs,bd3871f s,bd3872fs,bd3873fs block diagram, application circuit, pin assignment (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
technical note 7/15 www.rohm.com 2010.10 - rev. a ? 2010 rohm co., ltd. all rights reserved. bd3870fs,bd3871f s,bd3872fs,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 1718 19 20212223242526 27 28 1615 14 1312 0.0022 3 2 1 2930 31 32 11 10 9 8 7 6 5 4 0.22 0. 1 b2b1 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 -
technical note 8/15 www.rohm.com 2010.10 - rev. a ? 2010 rohm co., ltd. all rights reserved. bd3870fs,bd3871f s,bd3872fs,bd3873fs pin description (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
technical note 9/15 www.rohm.com 2010.10 - rev. a ? 2010 rohm co., ltd. all rights reserved. bd3870fs,bd3871f s,bd3872fs,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) ? ? ? ? ? ? ? ? ? ? description of operations 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
technical note 10/15 www.rohm.com 2010.10 - rev. a ? 2010 rohm co., ltd. all rights reserved. bd3870fs,bd3871f s,bd3872fs,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. 1ll 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 ll 2 4.14 in1 out1 ? ? 1.07 ll 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 ll 2 2.14 l 2 4.14 in2 out2 in1 out1 ? ? ?? ? ? ? ? ? ? (db) 10 20log3.14 ? fig.8 g f fc g 3db g 3db
technical note 11/15 www.rohm.com 2010.10 - rev. a ? 2010 rohm co., ltd. all rights reserved. bd3870fs,bd3871f s,bd3872fs,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
technical note 12/15 www.rohm.com 2010.10 - rev. a ? 2010 rohm co., ltd. all rights reserved. bd3870fs,bd3871f s,bd3872fs,bd3873fs 0 2 4 6 8 10 10 100 1000 10000 100000 frequency (hz) gain (db) 0 2 4 6 8 10 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 reference data 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
technical note 13/15 www.rohm.com 2010.10 - rev. a ? 2010 rohm co., ltd. all rights reserved. bd3870fs,bd3871f s,bd3872fs,bd3873fs notes 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
technical note 14/15 www.rohm.com 2010.10 - rev. a ? 2010 rohm co., ltd. all rights reserved. bd3870fs,bd3871f s,bd3872fs,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 thermal derating curve 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
technical note 15/15 www.rohm.com 2010.10 - rev. a ? 2010 rohm co., ltd. all rights reserved. bd3870fs,bd3871f s,bd3872fs,bd3873fs ordering part number 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 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 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 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 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
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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