BD3873FS

Sound Processors for BOOM BOX / Mini-component Stereo Sound Processors with Built-in 2-band Equalizers BD3870FS,BD3871FS,BD3872FS,BD3873FS No.10086EAT02 ●Description The Sound Processor with built-in 2 Band Equalizer, incorporates 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 constructed without external components. 4) Energy-saving design resulting in low current consumption, by utilizing the BiCMOS process ●Applications BOOM BOX, mini-audio systems, and micro-audio systems. ●Line up matrix Parameter Input Gain Loud Speaker Equalizer (SEQ) Input Selector Volume Equalizer Surround Serial Control Package ●Absolute maximum ratings (Ta=25℃) Prameter Power Supply Voltage Power Dissipation Operating Temperature Range Storage Temperature Range Symbol Vcc Pd Topr Tstg Ratings BD3870FS 10 800 *1 -25 to +75 -55 to +125 BD3871FS 10 800 *1 -25 to +75 -55 to +125 BD3873FS 10 800 *1 -25 to +75 -55 to +125 BD3872FS 10 950 *2 -25 to +75 -55 to +125 Unit V mW ℃ ℃ BD3870FS 0, 6, 12, 18dB No Three inputs 0 to -87dB/ 1dB step, -dB 2 band (Bass, Treble) Yes Two-wire serial SSOP-A24 BD3871FS 24, 26, 28dB No Three inputs 0 to -87dB/ 1dB step, -dB 2 band (Bass, Treble) Yes Two-wire serial SSOP-A24 BD3873FS 18, 21, 24, 27dB No Three inputs 0 to –87dB/ 1dB step, -dB 2 band (Bass, Treble) Yes Two-wire serial SSOP-A24 BD3872FS 0, 5, 10, 19, 21, 23, 26, 28dB Yes Five inputs 0 to -87dB/ 1dB step, -dB 2 band (Bass, Treble) Yes Two-wire serial SSOP-A32 *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 Operating Voltage Range *It must function normally at Ta=25℃. Symbol Vcc Ratings BD3870FS 4.5 to 9.5 BD3871FS 4.5 to 9.5 BD3873FS 4.5 to 9.5 BD3872FS 4.5 to 9.5 Unit V www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 1/15 2010.10 - Rev.A BD3870FS,BD3871FS,BD3872FS,BD3873FS Technical Note ●Electrical characteristics (Ta=25 ℃ , VCC=8V, f=1kHz, Vi=200mVrms, RL=10kΩ, Rg=600Ω, Input Gain=0dB (BD3870FS, BD3872FS only), Input Gain=24dB (BD3871FS only), Input Gain=18dB (BD3873FS only),Volume=0dB, Bass=0dB, Treble=0dB, Surround=OFF, Loud Speaker Equalizer=OFF (BD3872FS only), unless otherwise noted) Block Parameter Circuit Current Symbol IQ Limits Min. -2 Total Output Voltage Gain Gv 22 16 Total Harmonic Distortion ratio Maximum Output Voltage Total THD Vom 1.6 Total Output Noise Voltage Vno Total Residual Noise Voltage Cross-talk between Channels Cross-talk between Selectors Input Impedance Output Impedance Volume Control Range Volume Maximum Volume Attenuation Volume Input Impedance Bass Boost Gain Bass Bass Cut Gain Bass Step Resolution Treble Boost Gain Treble Vmno CTC CTS Rin Rout VRI Vmin Rvin GBB GBC BR GTB 35 70 -90 39 12 -16 10 12 -14 Treble Cut Gain Treble Step Resolution Surround Surround In-phase Gain Surround Single-phase Gain Surround Opposite-phase Gain Loud Speaker Equalizer Gain (BD3872FS only) GTC TR Vsur1 Vsur2 Vsur3 Seq -16 -2 4.3 8 3 40 4.5 -80 -80 50 100 -87 56 14 -14 2 12 14 -12 -14 2 0 6.3 10 5 80 15 -70 -70 65 130 50 -84 -90 73 16 -12 14 16 -10 -12 2 8.3 12 7 dB dB dB dB dB dB 2ch in-phase inputs 1ch input, 1ch grounded 2ch opposite-phase inputs f=10kHz dB kΩ Ω dB dB kΩ dB dB dB BD3870FS, BD3871FS, BD3873FS BD3872FS BD3870FS, BD3871FS, BD3873FS BD3872FS GB=20log(VOUT/VIN) GB=20log(VOUT/VIN) VR=20log(VOUT/VIN) BW=IHF-A µVrms dB dB Typ. 8 0 24 18 0.01 2.1 4.5 Max. 21 2 26 20 0.1 15 µVrms % Vrms dB Unit mA At no signal BD3870FS, BD3872FS Gv=20log(VOUT/VIN) BD3871FS Gv=20log(VOUT/VIN) BD3873FS Gv=20log(VOUT/VIN) BW=400 to 30kHz THD=1% BW=400 to 30kHz BD3870FS, BD3872FS Rg=0Ω, BW=IHF-A BD3871FS, BD3873FS Rg=0Ω, BW=IHF-A Rg=0Ω, BW=IHF-A Volume=-dB Rg=0Ω, BW=IHF-A VOUT=1Vrms Rg=0Ω, BW=IHF-A BD3870FS, BD3871FS, BD3873FS BD3872FS Condition www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. SEQ * For measurement, VP-9690A (Average value wave detection, Effective value display) IHF-A filter by Matsushita Communication Industrial is used. * Phase relation between Input/Output signal terminals is the same. * Note: This IC is not designed to be radiation-resistant. 2/15 2010.10 - Rev.A BD3870FS,BD3871FS,BD3872FS,BD3873FS ●Timing chart 1) Signal Timing Conditions ・Data is read on the rising edge of the clock. ・Latch is read out on the falling 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 SC (CLOCK) tsu 9 0% 90% 90% 90% Technical Note twc 10% t wc 10% 10% thd ts th tsd thd ts1 th1 SI DATA LATCH 90% twd 90% twh 10% 10% 90% 90% tw1 90% DATA DATA 10% LATCH End with Low Fig.1 Parameter Minimum Clock Width Minimum Data Width Minimum Latch Width Data Set-up Time (DATACLK) Data Hold Time (CLKDATA) Latch Set-up Time (CLKLATCH) Latch Hold Time (DATALATCH) Latch Low Set-up Time Latch Low Hold Width 2) Voltage Conditions for Control Signals Symbol Twc twd Tw1 Tsd Thd Ts1 Th1 Ts Twh Limits Min. 2.0 2.0 2.0 1.0 1.0 1.0 1.0 1.0 2.0 Typ. Max. - Unit µs µs µs µs µs µs µs µs µs Limits Parameter “H” Input Voltage “L” Input Voltage Min. 2.2 0 Typ. Max. (≦Vcc) 5.5 1.0 Unit V V Condition Vcc=4.5 to 9.5V Vcc=4.5 to 9.5V www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 3/15 2010.10 - Rev.A BD3870FS,BD3871FS,BD3872FS,BD3873FS 3) Control Data Format List Basic Configuration of Control Data Format  Data input direction MSB D9 D8 D7 D6 Data Control Data Format (BD3870FS, BD3871FS, BD3873FS)  Data input direction D9 D8 D7 D6 D5 (1) (2) (3) (4) * Input Selector Input Gain Volume A Bass Gain * * * * Surround D5 D4 D3 D2 Technical Note LSB D1 D0 Select Address D4 * D3 * D2 * * D1 0 0 1 D0 0 1 0 1 Volume B Treble Gain * * * 1 Control Data Format (BD3872FS)  Data input direction D9 D8 (1) (2) (3) (4) * * Input Gain D7 D6 D5 Input Selector D4 D3 * D2 * * D1 0 0 1 D0 0 1 0 1 Volume A Bass Gain * * * Volume B Treble Gain * Surround SEQ 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 Data(1) LSB L MSB Data(2) LSB L MSB Data(3) LSB L MSB Data(4) LSB 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 Data(2) LSB L “L” indicates a latch. www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 4/15 2010.10 - Rev.A BD3870FS,BD3871FS,BD3872FS,BD3873FS ●Block diagram, application circuit, pin assignment (BD3870FS, BD3871FS, BD3873FS) 5.6k 0.1μ 0.33μ 0.0022μ 0.0022μ 390k 24 23 22 21 20 19 Technical Note 5.6k 0.1μ 0.1μ OUT1 OUT2 10μ 390k 18 17 16 0.1μ DATA VCC LATCH CLOCK 10μ 15 14 13 Treble1 fc=8k Hz Treble２ fc=8kHz Bass2 f0 =80Hz B ass1 f0=80Hz Logic 0dB ～ -87dB -∞ ●Pin description (BD3870FS, BD3871FS, BD3873FS) Pin No. Pin Name Description 1 2 3 4 5 6 7 8 9 10 11 12 VIN1 VIN2 SEL2 SEL1 A1 A2 B1 B2 C1 C2 FILTER GND 1ch volume input pin 2ch volume input pin 2ch input selector output pin 1ch input selector output pin 1ch input pin A 2ch input pin A 1ch input pin B 2ch input pin B 1ch input pin C 2ch input pin C 1/2 VCC pin Ground pin Surround Vcc/2 Vcc/2 Vcc/2 Vcc/2 Vcc/2 50k 50k 50k 50k 50k 50k 1 2 3 4 5 6 7 8 9 10 11 12 47μ 10μ 10μ C1 C2 Unit: Resistance =Ω, Capacitor = F 10μ A1 10μ A2 10μ B1 10μ B2 10μ 4.7k 10 μ 4.7k Fig.2 Pin No. Pin Name 13 14 15 16 17 18 19 20 21 22 23 24 SC SI VCC OUT2 OUT1 BOUT1 BNF1 BOUT2 BNF2 TNF2 TNF1 CAP Description Serial clock input pin Serial data input pin Power supply pin 2ch output pin 1ch output pin 1ch bass filter setting pin 1ch bass filter setting pin 2ch bass filter setting pin 2ch bass filter setting pin 2ch treble filter setting pin 1ch treble filter setting pin Time constant setting pin for absorbing surround switching shock sound www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 5/15 2010.10 - Rev.A BD3870FS,BD3871FS,BD3872FS,BD3873FS ●Block diagram, application circuit, pin assignment (BD3872FS) OUT1 0.0022μ 0.0022μ 0.1μ 5.6K 0.1μ 5.6K 0.1μ + 390K 28 27 26 25 24 390K 23 22 21 20 19 OUT2 Vcc Technical Note DATA CLOCK LATCH 0.001μ 0.022μ 62K V cc/2 0.001μ 0.1μ 4.7μ + 4.7μ 0.33μ Vcc/2 32 31 30 29 18 17 Loud speaker Loud s peaker equalizer2 Treble1 fc=10kHz Treble2 fc=10kHz Bass1 f 0=80Hz Bass2 f0 =80Hz L ogic Surround V cc/2 Vcc/2 V cc/2 0dB ～ - 87dB -∞ 0dB ～ -87dB -∞ Vcc/2 V cc/2 100k 100k 100k 100k 100k 100k 100k 100k 100k 100k 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 + 16 0.1μ 0.22μ 0.22μ 0.1μ 0.1μ 0.1μ 0.1μ 0.1μ 0.1μ 0.1μ 0.1μ 4.7k 0.1μ 4.7k 10μ A1 A2 B1 B2 C1 C2 D1 D2 E1 E2 Unit: Resistance =Ω, Capacitor = F Fig.3 Application to Cinema Surround www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 6/15 2010.10 - Rev.A BD3870FS,BD3871FS,BD3872FS,BD3873FS Technical Note OUT1 OUT2 0.33μ 0.01μ 0.33μ 0.01μ 0.0022μ 0.0022μ 0.1μ 5.6K 0.1μ 5.6K 0.1μ Vcc DATA CLOCK LATCH 0.1μ 4.7μ 4.7μ 0.33μ + 32 31 30 29 28 27 390K 26 25 24 390K 23 22 + 21 20 19 18 17 Loud speaker equalizer1 Loud s peaker equalizer2 Treble1 fc=10kHz Treble２ fc=10kHz Bass1 f0 =80Hz Bass2 f0 =80Hz L ogic Surround V cc/2 Vcc/2 V cc/2 0dB ～ - 87dB -∞ 0dB ～ - 87dB -∞ Vcc/2 V cc/2 100k 100k 100k 100k 100k 100k 100k 100k 100k 100k 1 2 3 4 5 6 7 8 9 10 0.1μ 11 12 13 14 15 + 16 0.1μ 0.22μ 0.22μ 0.1μ 0.1μ 0.1μ 0.1μ 0.1μ 0.1μ 0.1μ 4.7k 0.1μ 4.7k 10μ A1 A2 B1 B2 C1 C2 D1 D2 E1 E2 Unit: Resistance =Ω, Capacitor = F Fig.4 Application to Loud Speaker Equalizer www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 7/15 2010.10 - Rev.A BD3870FS,BD3871FS,BD3872FS,BD3873FS ●Pin description (BD3872FS) Pin No. Pin Name 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 VIN1 SEL1 VIN2 SEL2 A1 A2 B1 B2 C1 C2 D1 D2 E1 E2 FILTER GND Technical Note Description Pin No. Pin Name 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 SC SI VCC CAP OUT2 OUT1 BOUT2 BNF2 BOUT1 BNF1 TNF2 TNF1 SOUT2 SQI2 SOUT1 SQI1 Description Serial clock input pin Serial data input pin Power supply pin Time constant setting pin for absorbing switching shock sound 2ch output pin 1ch output pin 2ch bass filter setting pin 2ch bass filter setting pin 1ch bass filter setting pin 1ch bass filter setting pin 2ch treble filter setting pin 1ch treble filter setting pin 2ch cinema surround or SEQ setting pin 2ch cinema surround or SEQ setting pin 1ch cinema surround or SEQ setting pin 1ch cinema surround or SEQ setting pin 1ch volume input pin 1ch input selector output pin 2ch volume input pin 2ch input selector output pin 1ch input pin A 2ch input pin A 1ch input pin B 2ch input pin B 1ch input pin C 2ch input pin C 1ch input pin D 2ch input pin D 1ch input pin E 2ch input pin E 1/2 VCC pin Ground pin www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 8/15 2010.10 - Rev.A BD3870FS,BD3871FS,BD3872FS,BD3873FS ●Description of operations 1) Bass filter Using external components, center frequencies and Q factors of the bass characteristics are flexible 1 f0  R1R2R3  R4  C1C2 2π IN + R3 R4 Q R2 C1 R1 C2 G(boost)  20log R2 R3  R4  R1R2R4C1C2 R2  R3  R4 R1C1  C2  R2  R3  R4 Technical Note (Hz) R1R2  R3  R4  R2R3 R1R2  R3  R4    C2 C1 C2 C1 1 (dB) 1 Fig.5 R1R2  R3  R4  G cut  20log R2(R3  R4 R1R2  R3  R4  R2R3   C2 C1 C2 C1 1 (dB) 1 Standard values of R3, R4 (reference) (R1=5.6kΩ, R2=390kΩ, C1=C2=0.1µF) Resistance (kΩ) * Typ. Bass Boost Cut Amount R3 R4 0dB 2dB 4dB 6dB 8dB 10dB 12dB 14dB 77.64 58.90 44.02 32.20 22.82 15.36 9.44 4.78 0 18.73 33.60 45.42 54.80 62.26 68.18 72.84 G G F0 G f * The actual boost cut amount may deviate from the standard values in some degree. Fig.6 www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 9/15 2010.10 - Rev.A BD3870FS,BD3871FS,BD3872FS,BD3873FS 2) Treble filter IN + OUT Technical Note fc = 1 2πR2C (Hz) R1+R2+Zc (dB) R2+Zc G (boost) = 20log R1 R2 G (cut) = 20log Zc = 1 jωc R2+Zc (dB) R1+R2+Zc (Ω) C Fig.7 Standard values of R1, R2 (reference) Resistance (kΩ) * Typ. Treble Boost Cut Amount R1 R2 0dB 2dB 4dB 6dB 8dB 10dB 12dB 14dB (BD3872FS only) 0 7.46 13.39 18.10 21.84 24.81 27.20 29.04 36.28 28.82 22.89 18.18 14.44 11.47 9.08 7.24 G 3dB G f fc G 3dB Fig.8 * The actual boost cut amount may deviate from the standard values in some degree. 3) Matrix surround L IN1 + OUT1 + + (4.14L/2 - 2.14R/2) × 1/2 + +× 1/2 + (4.14R/2 - 2.14L/2) × 2.14 R IN2 Fig.9 + OUT2 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. OUT1 OUT2  4.14 2.14  20log1 0 (dB) L L L 1    2 IN1 IN2 2 Single-phase Gain: Gains obtained on OUT1 and OUT2 against IN1 when inputting a signal to IN1 and AC-grounding IN2 (R=0). OUT1 4.14 L L  2,07  20log2.07 6.3 (dB) IN1 2 OUT2 2.14 20log 1.07  0.59 (dB) L L   1.07  IN1 2 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. OUT1 OUT2  4.14 2.14  20log3.14  10 (dB) L L  L  3.14   IN1 IN2 2 2   www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 10/15 2010.10 - Rev.A BD3870FS,BD3871FS,BD3872FS,BD3873FS Technical Note 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 the 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. 32 31 30 29 Loud speaker equalizer1 Loud speaker equalizer2 Fig.10 ◎Loud Speaker Equalizer (SEQ) BOOM BOX and Micro-sound systems are often 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 Articulation Index is also increased. IN Phase Shifter OUT HPF SEQ (30, 32pin) C1 C2 SOUT (29. 31pin) Fig.11 ・C1 can be selected to determine the frequency where the phase should be inverted. C1 Frequency where the phase is inverted Larger value Smaller value Set to the lower frequency side Set to the higher frequency side ・C2 can be selected to determine the HPF cut-off frequency fc. The SEQ gain remains constant. fc = 1 2RC (Hz) (Where R is a built-in resistance of 10kΩ) GAIN 3dB G=5dB (Constant) Fc FREQUENCY Fig.12 www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 11/15 2010.10 - Rev.A BD3870FS,BD3871FS,BD3872FS,BD3873FS ●Reference data 10 10 10 Technical Note 8 OUTPUT VOLTAGE (Vrms) 1 1 6 THD+N (%) ICC (mA) 0.1 0.1 4 2 0.01 0.01 0 0 2 4 6 8 10 0.001 0.001 0.01 0.1 1 10 0.001 0.001 0.01 0.1 1 10 VCC (V) INPUT VOLTAGE (Vrms) INPUT VOLTAGE (Vrms) Fig.13 Circuit Current - Power Supply Voltage Fig.14 Output Voltage - Input Voltage (BD3870FS) Fig.15 Total Harmonic Distortion ratio - Input Voltage (BD3870FS) 20 30 15 At 18dB setting 18 At 24dB setting 25 20 15 10 5 0 10 5 0 -5 -10 +14dB -14～+14dB 2dB step GAIN (dB) GAIN (dB) 16 14 12 10 10 100 1000 10000 100000 GAIN (dB) -14dB -15 10 100 1000 10000 100000 10 100 1000 10000 100000 FREQUENCY (Hz) FREQUENCY (Hz) FREQUENCY (Hz) Fig.16 Current Gain - Frequency (BD3870FS, BD3873FS) Fig.17 Voltage Gain - Frequency (BD3871FS) Fig.18 Bass Gain - Frequency 15 10 5 0 -5 -10 -15 10 100 1000 +12dB -12～+12dB 2dB step 15 10 5 0 -5 -10 +14dB -14～+14dB 2dB step GAIN (dB) 20 15 GAIN (dB) GAIN (dB) At oppoite-phase input 10 5 -12dB 10000 100000 -15 10 100 -14dB 1000 10000 100000 0 10 100 1000 10000 100000 FREQUENCY (Hz) FREQUENCY (Hz) FREQUENCY (Hz) Fig.19 Treble Gain - Frequency (BD3870FS,BD3871FS,BD3873FS) Fig.20 Treble Gain - Frequency (BD3872FS) Fig.21 Surround Gain - Frequency 10 8 GAIN (dB) 6 4 2 0 10 100 1000 10000 100000 FREQUENCY (Hz) Fig. 22 Treble Gain - Frequency (BD3872FS) www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 12/15 2010.10 - Rev.A BD3870FS,BD3871FS,BD3872FS,BD3873FS ●Notes for use Technical Note 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 circuits may cause variations in both static and transient characteristics for external components 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 regarding 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. Make 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 are 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 mounting direction or shorts between 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 power-ON, until this operation cycle is completed. Mute should be applied during this cycle. Function Input Selector Input Gain Loud Speaker Equalizer Volume Surround Treble Gain Bass Gain (BD3872FS only) Initial Condition Input A 0dB OFF -dB OFF 0dB 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 characteristics are determined depending on the external capacitor value for input coupling, and the input impedance value inside the IC. C G 0 R A (f) f (2πfCR) A(f) = Fig.23 2 1+(2πfCR)2 Fig.24 www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 13/15 2010.10 - Rev.A BD3870FS,BD3871FS,BD3872FS,BD3873FS Technical Note 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 application circuit, a constant value as an example, 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 switching operation. The switching time constant T is stated as T=2.55×105×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 function 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 MUTE (L=ON, H=OFF) SERIAL DATA SERIAL DATA 40～60ms 500～600ms INPUT SOURCE Fig.25 ●Thermal Derating Curve 1200 1000 SSOP-A32 Power Dissipation : Pd （mW) 800 SSOP-A24 600 400 200 0 0 25 50 75 100 125 Ambient Temperature: Ta(℃) When installed ROHM standard board (70×70×1.6mm Glass epoxy board) Fig.26 www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 14/15 2010.10 - Rev.A BD3870FS,BD3871FS,BD3872FS,BD3873FS ●Ordering part number Technical Note 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 SSOP-A24 10 ± 0.2 (MAX 10.35 include BURR) 24 13 +6° 4° −4° Tape Quantity Embossed carrier tape 2000pcs E2 The direction is the 1pin of product is at the upper left when you hold 7.8 ± 0.3 5.4 ± 0.2 1 12 0.1±0.1 1.8±0.1 +0.1 0.17 −0.05 1.2 ± 0.15 Direction of feed 0.5 ± 0.2 ( reel on the left hand and you pull out the tape on the right hand ) 0.8 0.1 0.38±0.1 1pin (Unit : mm) Direction of feed Reel ∗ Order quantity needs to be multiple of the minimum quantity. SSOP-A32 13.6 ± 0.2 (MAX 13.95 include BURR) 32 17 Tape Quantity Direction of feed 0.3MIN Embossed carrier tape 2000pcs E2 The direction is the 1pin of product is at the upper left when you hold 7.8 ± 0.3 5.4 ± 0.2 ( reel on the left hand and you pull out the tape on the right hand ) 1 16 1.8 ± 0.1 0.15 ± 0.1 0.11 0.36 ± 0.1 0.8 0.1 1pin (Unit : mm) Direction of feed Reel ∗ Order quantity needs to be multiple of the minimum quantity. www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 15/15 2010.10 - Rev.A Notice Notes No copying or reproduction of this document, in part or in whole, is permitted without the consent of ROHM Co.,Ltd. The content specified herein is subject to change for improvement without notice. The content specified 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 specifications, 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 specified 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 specified 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 specified in this document are intended to be used with general-use electronic equipment or devices (such as audio visual equipment, office-automation equipment, communication devices, electronic appliances and amusement devices). The Products specified 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, fire or any other damage caused in the event of the failure of any Product, such as derating, redundancy, fire 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, aerospace machinery, nuclear-reactor controller, fuelcontroller 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 specified 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. Thank you for your accessing to ROHM product informations. More detail product informations and catalogs are available, please contact us. ROHM Customer Support System http://www.rohm.com/contact/ www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. R1010A