DatasheeDatasheett Sound Processor with Built-in 3-band Equalizer BD37533FV General Description Key Specifications BD37533FV is a sound processor with built-in 3-band Power Supply Voltage Range: 7.0V to 9.5V equalizer for car audio. A stereo input selector is Circuit Current (No Signal): 38mA (Typ) available that functions to switch single end input and Total Harmonic Distortion 1: ground isolation input, input-gain control, main volume, (FRONT,REAR) 0.001% (Typ) loudness, 5ch fader volume, LPF for subwoofer and Total Harmonic Distortion 2: mixing input. Moreover, Advanced switch circuit, (SUBWOOFER) 0.002% (Typ) which is an original ROHM technology, can reduce Maximum Input Voltage: 2.3Vrms (Typ) various switching noise (ex. No-signal, low frequency Cross-talk Between Selectors: -100dB (Typ) like 20Hz & large signal inputs). Also, Advanced Volume Control Range: +15dB to -79dB switch makes microcomputer control easier, and Output Noise Voltage 1: constructs a high quality car audio system. (FRONT,REAR) 3.8Vrms (Typ) Output Noise Voltage 2: (SUBWOOFER) 4.8Vrms (Typ) Features Residual Output Noise Voltage: 1.8Vrms (Typ) Reduced switching noise of input gain control, Operating Temperature Range: -40C to +85C mute, main volume, fader volume, bass, middle, treble, loudness by using advanced switch circuit Built-in differential input selector that can make Package W(Typ) x D(Typ) x H(Max) various combination of single-ended / differential input. Built-in ground isolation amplifier inputs, which is ideal for external stereo input. Built-in input gain controller reduces volume switching noise of a portable audio input. Decreased number of external components due to built-in 3-band equalizer filter, LPF for subwoofer and loudness filter. It is possible to freely control the Q, Gv, fo of the 3-band equalizer, fc of the 2 LPFand Gv of loudness by I C BUS control. A gain adjustment quantity of 20dB with a 1 dB step gain adjustment is possible for the bass, middle and treble. SSOP-B28 Equipped with terminals for the subwoofer outputs. 10.0mm x 7.60mm x 1.35mm Also, the audio signal outputs of the front, rear and 2 subwoofer can be chosen using the I C BUS control. Built-in mixing input, mixing attenuator. Energy-saving design resulting in low current consumption is achieved utilizing the BiCMOS process. It has the advantage in quality over scaling down the power heat control of the internal regulators Input pins and output pins are organized and separately laid out to keep the signal flow in one direction which consequently, simplify pattern layout of the set board and decrease the board dimensions 2 It is possible to control I C BUS with 3.3V / 5V Applications It is optimal for car audio systems. It can also be used for audio equipment of mini Compo, micro Compo, TV etc Product structureSilicon monolithic integrated circuit This product has no designed protection against radioactive rays www.rohm.com TSZ02201-0C2C0E100540-1-2 2015 ROHM Co., Ltd. All rights reserved. 1/33 16.Dec.2015 Rev.001 TSZ2211114001 BD37533FV Typical Application Circuit BD37533FV Pin Configuration TOP VIEW A1 1 28 FIL A2 2 27 GND 26 SDA B1 3 B2 4 25 SCL C1 5 24 VCC 23 OUTF1 C2 6 DP1 7 22 OUTF2 DN 8 21 OUTR1 DP2 9 20 OUTR2 EP1 10 19 OUTS1 EN1 11 18 OUTS2 EN2 12 17 TEST2 EP2 13 16 TEST1 15 MUTE MIN 14 Pin Descriptions Pin Pin Pin No. Description Pin No. Description Name Name 1 A1 A input terminal of 1ch 15 MUTE External compulsory mute terminal 2 A2 A input terminal of 2ch 16 TEST1 Test Pin 3 B1 B input terminal of 1ch 17 TEST2 Test Pin 4 B2 B input terminal of 2ch 18 OUTS2 Subwoofer output terminal of 2ch 5 C1 C input terminal of 1ch 19 OUTS1 Subwoofer output terminal of 1ch 6 C2 C input terminal of 2ch 20 OUTR2 Rear output terminal of 2ch 7 DP1 D positive input terminal of 1ch 21 OUTR1 Rear output terminal of 1ch 8 DN D negative input terminal 22 OUTF2 Front output terminal of 2ch 9 DP2 D positive input terminal of 2ch 23 OUTF1 Front output terminal of 1ch 10 EP1 E positive input terminal of 1ch 24 VCC Power supply terminal 2 11 EN1 E negative input terminal of 1ch 25 SCL I C Communication clock terminal 2 12 EN2 E negative input terminal of 2ch 26 SDA I C Communication data terminal 13 EP2 E positive input terminal of 2ch 27 GND GND terminal 14 MIN Mixing input terminal 28 FIL VCC/2 terminal www.rohm.com TSZ02201-0C2C0E100540-1-2 2015 ROHM Co., Ltd. All rights reserved. 2/33 16.Dec.2015 Rev.001 TSZ2211115001