DatasheeDatasheett Sound Processor with Built-in 2-band Equalizer BD37514FS General Description Key Specifications BD37514FS is a sound processor with built-in 2-band Power Supply Voltage Range: 7.0V to 9.5V equalizer for car audio. The functions are 4ch stereo Circuit Current (No Signal): 38mA(Typ) input selector, input-gain control, main volume, Total Harmonic Distortion 1: loudness, and 5ch fader volume. Moreover, its (FRONT,REAR) 0.001%(Typ) Advanced switch circuit, which is an original ROHM Total Harmonic Distortion 2: technology, can reduce various switching noise (ex. (SUBWOOFER) 0.002%(Typ) No-signal, low frequency like 20Hz & large signal Maximum Input Voltage: 2.3Vrms(Typ) inputs). Advanced switch makes control of Cross-talk between Selectors: -100dB(Typ) microcomputer easier, supporting the construction of a Volume Control Range: +15dB to -79dB high quality car audio system. Output Noise Voltage1: (FRONT,REAR) 3.8Vrms(Typ) Output Noise Voltage2: (SUBWOOFER) 4.8Vrms(Typ) Features Residual Output Noise Voltage: 1.8Vrms(Typ) Reduce switching noise of input gain control, mute, Operating Temperature Range: -40C to +85C main volume, fader volume, bass, treble, loudness by using advanced switch circuit. Built-in 1 differential input selector and 3 single-ended input selectors Package W(Typ) x D(Typ) x H(Max) Built-in ground isolation amplifier inputs, ideal for external stereo input. Built-in input gain controller reduces switching noise for volume of a portable audio input. Decrease the number of external components due to built-in 2-band equalizer filter and loudness filter. Also, it is possible to control Q, Gv, fo of 2-band 2 equalizer, and Gv of loudness using I C BUS control. It is possible to adjust the gain of the bass and treble up to 20dB with 1 dB step gain adjustment. SSOP-A20 It is equipped with output terminals of Subwoofer. 8.70mm x 7.80mm x 2.01mm Energy-saving design resulting in low current consumption, by utilizing the Bi-CMOS process. It has the advantage in quality over scaling down the power heat control of the internal regulators. Input terminals and output terminals are organized Applications and separately laid out to keep the signal flow in It is optimal for use in car audio systems. It can also be one direction which results in simpler and smaller used for audio equipment of mini Compo, micro Compo, PCB layout. TV, etc. 2 It is possible to control the I C BUS by 3.3V / 5V. Product structureSilicon monolithic integrated circuit This product has no designed protection against radioactive rays www.rohm.com TSZ02201-0C2C0E100440-1-2 2015 ROHM Co., Ltd. All rights reserved. 1/27 16.Dec.2015 Rev.001 TSZ2211114001 BD37514FS Typical Application Circuit BD37514FS Unit R : C : F Pin Configuration TOP VIEW FIL 1 20 GND A1 2 19 SDA A2 3 18 SCL 17 VCC B1 4 B2 5 16 OUTF1 C1 6 15 OUTF2 C2 7 14 OUTR1 DP1 8 13 OUTR2 DN 9 12 OUTS DP2 10 11 MUTE Pin Descriptions Pin Pin Pin No. Description Pin No. Description Name Name 1 FIL VCC/2 terminal 11 MUTE External compulsory mute terminal 2 A1 A input terminal of 1ch 12 OUTS Subwoofer output terminal 3 A2 A input terminal of 2ch 13 OUTR2 Rear output terminal of 2ch 4 B1 B input terminal of 1ch 14 OUTR1 Rear output terminal of 1ch 5 B2 B input terminal of 2ch 15 OUTF2 Front output terminal of 2ch 6 C1 C input terminal of 1ch 16 OUTF1 Front output terminal of 1ch 7 C2 C input terminal of 2ch 17 VCC Power supply terminal 2 8 DP1 D positive input terminal of 1ch 18 SCL I C Communication clock terminal 2 9 DN D negative input terminal 19 SDA I C Communication data terminal 10 DP2 D positive input terminal of 2ch 20 GND GND terminal www.rohm.com TSZ02201-0C2C0E100440-1-2 2015 ROHM Co., Ltd. All rights reserved. 2/27 16.Dec.2015 Rev.001 TSZ2211115001