1/4 Structure: Silicon Monolithic Integrated Circuit Product: Sound Processor for car audio Type: BD37541FS Package: SSOP-A32 ●Feature 1. Reduce switching noise of input gain control, mute, main volume, fader volume, bass, middle, treble, loudness, by using advanced switch circuit [Possible to control all steps] 2. Built-in ground isolation amplifier inputs, ideal for external stereo input. 3. Built-in differential input selector that can make various combination of single-ended / differential input. 4. Built-in input gain controller reduce switching noise for volume of a portable audio input. 5. Decrease the number of external components by built-in 3-band equalizer filter. And, possible to control Q, Gv, fo of 3-band equalizer by I2C BUS control freely. 6. It is possible for the bass, middle, treble to the gain adjustment quantity of ±20dB and 1 dB step gain adjustment. 7. It is equipped with output terminals of Subwoofer. Moreover, the stereo signal of the front and rear also can be 2 output by the I C BUS control. 8. Built-in mixing input. 9. Bi-CMOS process is suitable for the design of low current and low energy. And it provides more quality for small-scale regulator and heat in a set. 10. Package is SSOP-A32. Putting input-terminals together and output-terminals together can make PCB layout easier and can makes area of PCB smaller. 2 11. It is possible to control by 3.3V / 5V for I C BUS. ●Absolute Maximum Ratings (Ta=25℃) Parameter Power supply Voltage Input voltage Power Dissipation Storage Temperature Symbol VCC VIN Pd Tastg Limits 10.0 VCC+0.3～GND-0.3 950 ※1 -55～+150 Unit V V mW ℃ ※1 At Ta＝25°C or higher, this value is decreaced to 8.5mW/°C When Rohm standard board is mounted. Size：70×70×1.6(mm3) Rohm standard board: material：FR4 glass-epoxy substrate (copper foil area: not more than 3%). ●Operating Range Parameter Power supply Voltage Temperature Symbol VCC Topr Min. 7.0 -40 Typ. － － ※Design against radiation-proof isn’t made. REV. A Max. 9.5 +85 Unit V ℃ 2/4 ●Function Function Input selector Input gain Mute Volume Bass Middle Treble Fader Loudness Mixing Specifications Stereo 3 single-end input and 2differential input possible to switch single-end input 0～20dB (1dB step), Possible to use “Advanced switch” for prevention of switching noise. Possible to use “Advanced switch” for prevention of switching noise. +15dB～-79dB (1dB step), -∞dB Possible to use “Advanced switch” for prevention of switching noise. -20～+20dB (1dB step), Q=0.5, 1, 1.5, 2, fo=60, 80, 100, 120Hz Possible to use advanced switch at changing gain -20～+20dB (1dB step), Q=0.75, 1, 1.25, 1.5, fo=500, 1k, 1.5k, 2.5kHz Possible to use advanced switch at changing gain -20～+20dB (1dB step), Q=0.75, 1.25, fo=7.5k, 10k, 12.5k, 15kHz Possible to use advanced switch at changing gain 0dB～-79dB (1dB step), -∞dB Possible to use “Advanced switch” for prevention of switching noise. 0dB～20dB (1dB step) Possible to use “Advanced switch” for prevention of switching noise. Monaural input ●Electrical Characteristic (Unless specified particularly, Ta=25℃, VCC=8.5V, f=1kHz, Vin=1Vrms, Rg=600Ω, RL=10kΩ, A input, Input gain 0dB, Mute OFF, Volume 0dB, Tone control 0dB, Loudness 0dB, Fader 0dB, Mixing OFF) Limit Item Symbol Unit Condition Min. Typ. Max. IQ mA No signal － 38 48 Current upon no signal GV -1.5 0 1.5 dB Gv=20log(VOUT/VIN) Voltage gain CB -1.5 0 1.5 dB CB = GV1-GV2 Channel balance Total harmonic distortion 1 VOUT=1Vrms THD+N1 － 0.001 0.05 ％ BW=400-30KHz (FRONT,REAR) Total harmonic distortion 2 VOUT=1Vrms THD+N2 － 0.002 0.05 ％ BW=400-30KHz (SUBWOOFER) Output noise voltage 1 Rg = 0Ω VNO1 － 3.8 15 μVrms BW = IHF-A (FRONT,REAR) Output noise voltage 2 Rg = 0Ω VNO2 － 4.8 15 μVrms BW = IHF-A (SUBWOOFER) Fader=-∞dB VNOR μVrms Rg=0Ω － 1.8 10 Residual output noise voltage BW=IHF-A Rg=0Ω CTC -100 -90 dB CTC=20log(VOUT/VIN) － Cross-talk between channels BW=IHF-A f=100Hz RR -70 -40 dB VRR=100mVrms － Ripple rejection RR=20log(VOUT/VCCIN) XP1 and XN input Common mode rejection ratio XP2 and XN input CMRR 50 65 － dB CMRR=20log(VIN/VOUT) (D, E) BW = IHF-A,[※X・・・D,E] VIM at THD+N(VOUT)=1% VIM 2.0 2.2 － Vrms Maximum input voltage BW=400-30kHz Volume = 15dB dB GV MAX 13 15 17 VIN=100mVrms Maximum gain Gv=20log(VOUT/VIN) Volume=-∞dB dB Gf=20log(VOUT/VIN) GV MIN － -100 -85 Maximum attenuation BW=IHF-A THD+N=1% VOM 2.0 2.2 － Vrms Maximum output voltage BW=400-30kHz REV. A 3/4 ●Dimensional outline drawing Max13.95(include. BURR) BD37541FS Lot No. SSOP-A32 (UNIT：mm) ●Block Diagram ●Descriptions of terminal Terminal No. 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 REV. A Terminal Name A1 A2 B1 B2 C1 C2 DP1 DN DP2 EP1 EN1 EN2 EP2 MIN LDA1 LDB1 LDB2 LDA2 MUTE N.C. TEST OUTS2 OUTS1 OUTR2 OUTR1 OUTF2 OUTF1 VCC SCL SDA GND FIL 4/4 ●Cautions on use (1) Absolute maximum ratings If applied voltage, operating temperature range, or other absolute maximum ratings are exceeded, the LSI may be damaged. Do not apply voltages or temperatures that exceed the absolute maximum ratings. If you think of a case in which absolute maximum ratings are exceeded, enforce fuses or other physical safety measures and investigate how not to apply the conditions under which absolute maximum ratings are exceeded to the LSI. (2) GND potential Make the GND pin voltage such that it is the lowest voltage even when operating below it. Actually confirm that the voltage of each pin does not become a lower voltage than the GND pin, including transient phenomena. (3) Thermal design Perform thermal design in which there are adequate margins by taking into account the allowable power dissipation in actual states of use. (4) Shorts between pins and misinstallation When mounting the LSI on a board, pay adequate attention to orientation and placement discrepancies of the LSI. If it is misinstalled and the power is turned on, the LSI may be damaged. It also may be damaged if it is shorted by a foreign substance coming between pins of the LSI or between a pin and a power supply or a pin and a GND. (5) Operation in strong magnetic fields Adequately evaluate use in a strong magnetic field, since there is a possibility of malfunction. 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. 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