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Rohm BD37524FS Technical Notes

Sound processor series for car audio, sound processor with built-in 3-band equalizer
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Sound Processor Series for Car Audio
Sound Processor with Built-in
3-band Equalizer
BD37524FS
●Description
BD37524FS is sound processors built-in 3-band equalizer for car audio. The functions are stereo 5ch input selector,
input-gain control, main volume, loudness, 5ch fader volume, LPF for subwoofer, level meter. Moreover, "Advanced switch
circuit", that is ROHM original technology, can reduce various switching noise (ex. No-signal, low frequency likes 20Hz &
large signal inputs). "Advanced switch" makes control of microcomputer easier, and can construct high quality car audio
system.
●Features
1) Reduce switching noise of input gain control, mute, main volume, fader volume, bass, treble, loudness by using
advanced switch circuit [Possible to control all steps]
2) Built-in 1 differential input selector and 4 single-ended input selectors
3) Built-in ground isolation amplifier inputs, ideal for external stereo input.
4) Built-in input gain controller reduces switching noise for volume of a portable audio input.
5) Decrease the number of external components by built-in 3-band equalizer filter, LPF for subwoofer, loudness filter.
And, possible to control Q, Gv, fo of 3-band equalizer and fc of LPF, fo, Gv of loudness by I
6) It is possible for the bass, middle, and treble to the gain adjustment quantity of ±20dB and 1 dB step gain adjustment.
7) Terminals for the subwoofer outputs are equipped.
8) 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.
9) Package is SSOP-A24. Putting input-terminals together and output-terminals together can make PCB layout easier
and can makes area of PCB smaller.
10) It is possible to control by 3.3V / 5V for I
●Applications
It is the optimal for the car audio. Besides, it is possible to use for the audio equipment of mini Compo, micro Compo, TV
etc with all kinds.
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
2
C BUS.
1/25
No.10085EAT05
2
C BUS control freely
2010.03 - Rev.A

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  • Page 1 BD37524FS ●Description BD37524FS is sound processors built-in 3-band equalizer for car audio. The functions are stereo 5ch input selector, input-gain control, main volume, loudness, 5ch fader volume, LPF for subwoofer, level meter. Moreover, “Advanced switch circuit”, that is ROHM original technology, can reduce various switching noise (ex. No-signal, low frequency likes 20Hz &...
  • Page 2 ROHM Standard board Size：70×70×1.6(㎣) Material：A FR4 grass epoxy board(3% or less of copper foil area) ●Operating conditions Item Symbol Unit － Power supply Voltage ℃ － Temperature Topr www.rohm.com 2010.03 - Rev.A 2/25 © 2010 ROHM Co., Ltd. All rights reserved.
  • Page 3 V MIN BW = IHF-A Attenuation set error 1 GAIN & ATT=+15dB～-15dB V ERR1 Attenuation set error 2 ATT=-16dB～-47dB V ERR2 Attenuation set error 3 ATT=-48dB～-79dB V ERR3 www.rohm.com 2010.03 - Rev.A 3/25 © 2010 ROHM Co., Ltd. All rights reserved.
  • Page 4 Output offset voltage L OFF VP-9690A(Average value detection, effective value display) filter by Matsushita Communication is used for ＊ measurement. Phase between input / output is same. www.rohm.com 2010.03 - Rev.A 4/25 © 2010 ROHM Co., Ltd. All rights reserved.
  • Page 5 100k 100k Frequency [Hz] Frequency [Hz] Frequency [Hz] Frequency (Hz) Frequency (Hz) Fig.10 Treble Gain vs Freq Fig.11 Treble fo vs Freq Fig.12 Treble Q vs Freq www.rohm.com 2010.03 - Rev.A 5/25 © 2010 ROHM Co., Ltd. All rights reserved.
  • Page 6 Fig.16 Treble Gain vs Noise Fig.17 CMRR vs Freq Fig.18 Rload vs Vo Vin [Vrms] Fig.19 Advanced Switch 1 Fig.20 Advanced Switch 2 Fig.21 Level Meter Vin vs Vo www.rohm.com 2010.03 - Rev.A 6/25 © 2010 ROHM Co., Ltd. All rights reserved.
  • Page 7 Power supply terminal D input terminal of 2ch C Communication clock terminal E input terminal of 1ch C Communication data terminal E input terminal of 2ch GND terminal www.rohm.com 2010.03 - Rev.A 7/25 © 2010 ROHM Co., Ltd. All rights reserved.
  • Page 8 SCL. About 7(tHD;DAT), 8(tSU;DAT), make it the setup which a margin is fully in . www.rohm.com 2010.03 - Rev.A 8/25 © 2010 ROHM Co., Ltd. All rights reserved.
  • Page 9 ｔHD;STA ｔHD;DAT ｔSU;DAT ｔSU;STO ：2us ：1us ：1us ：2us ｔBUF ｔLOW ｔHIGH ：4us ：3us ：1us SCL clock frequency：250kHz Fig.24 A command timing example in the I2C data transmission www.rohm.com 2010.03 - Rev.A 9/25 © 2010 ROHM Co., Ltd. All rights reserved.
  • Page 10 Select Address 2 Data （Note）If any data is transmitted as Select Address 2 next to data, it is recognized as data, not as Select Address 2. （４）Slave address www.rohm.com 2010.03 - Rev.A 10/25 © 2010 ROHM Co., Ltd. All rights reserved.
  • Page 11 ４． When using mute function of this IC at the time of changing input selector, please switch mute ON/OFF for waiting advanced-mute time. www.rohm.com 2010.03 - Rev.A 11/25 © 2010 ROHM Co., Ltd. All rights reserved.
  • Page 12 Subwoofer LPF fc RESET LPF Phase Phase Level 0° Meter Subwoofer LPF fc 180° RESET Select address 03(hex) Loudness fo 250Hz 400Hz 800Hz Prohibition : Initial condition www.rohm.com 2010.03 - Rev.A 12/25 © 2010 ROHM Co., Ltd. All rights reserved.
  • Page 13 10dB 11dB Mute 12dB ON/OFF 13dB 14dB 15dB 16dB 17dB 18dB 19dB 20dB ： Prohibition ： ： ： ： Mute ON/OFF Mode Input Gain : Initial condition www.rohm.com 2010.03 - Rev.A 13/25 © 2010 ROHM Co., Ltd. All rights reserved.
  • Page 14 14dB 13dB ： ： ： ： ： ： ： ： ： -77dB -78dB -79dB Prohibition ： ： ： ： ： ： ： ： -∞dB : Initial condition www.rohm.com 2010.03 - Rev.A 14/25 © 2010 ROHM Co., Ltd. All rights reserved.
  • Page 15 Q factor 2.5kHz Select address 47 (hex) Treble Q factor Q factor 0.75 Treble fo 1.25 Treble 7.5kHz 10kHz Treble Q factor 12.5kHz 15kHz : Initial condition www.rohm.com 2010.03 - Rev.A 15/25 © 2010 ROHM Co., Ltd. All rights reserved.
  • Page 16 Boost 13dB /cut 14dB 15dB 16dB 17dB 18dB 19dB 20dB ： ： ： ： ： Prohibition Bass/ Middle/ Treble Boost/Cut Mode Boost Bass/Middle/Treble Gain : Initial condition www.rohm.com 2010.03 - Rev.A 16/25 © 2010 ROHM Co., Ltd. All rights reserved.
  • Page 17 Mute is possible forcibly than the outside after input again department, by the setting of the MUTE terminal. Mute Voltage Condition Mode GND～1.0V MUTE ON 2.3V～VCC MUTE OFF Establish the voltage of MUTE in the condition to have been defined. www.rohm.com 2010.03 - Rev.A 17/25 © 2010 ROHM Co., Ltd. All rights reserved.

  • Page 18: Initial Condition

    Technical Note BD37524FS Volume / Fader volume attenuation of the details (dB) (dB) -∞ ：Initial condition www.rohm.com 2010.03 - Rev.A 18/25 © 2010 ROHM Co., Ltd. All rights reserved.
  • Page 19 Ex) Detected frequency bandwidth is above 40Hz, 『40Hz = 25ms = WAIT time』 Transmission Example by I C BUS (RESET) (HOLD) CBUS Wait time RESET HOLD (25msec) START START ※fin＝40Hz LOUT [ V ] detect www.rohm.com 2010.03 - Rev.A 19/25 © 2010 ROHM Co., Ltd. All rights reserved.
  • Page 20 The lines shall be shielded, if they are adjacent to each other. ⑤ Lines of analog input shall not be parallel if possible. The lines shall be shielded, if they are adjacent to each other. www.rohm.com 2010.03 - Rev.A 20/25 © 2010 ROHM Co., Ltd. All rights reserved.
  • Page 21 A terminal for fader and Subwoofer output. OUTS1 OUTR2 OUTR1 4.25 OUTF2 OUTF1 The figure in the pin explanation and input/output equivalent circuit is reference value, it doesn’t guarantee the value. www.rohm.com 2010.03 - Rev.A 21/25 © 2010 ROHM Co., Ltd. All rights reserved.
  • Page 22 4.25 The figure in the pin explanation and input/output equivalent circuit is reference value, it doesn’t guarantee the value. www.rohm.com 2010.03 - Rev.A 22/25 © 2010 ROHM Co., Ltd. All rights reserved.
  • Page 23 Any voltage shall not be supplied to Mute terminal (13pin) when power-supply is off. Please insert a resistor (about 2.2kΩ) to Mute terminal in series, if voltage is supplied to mute terminal in case. (Please refer Application Circuit Diagram.) www.rohm.com 2010.03 - Rev.A 23/25 © 2010 ROHM Co., Ltd. All rights reserved.
  • Page 24 Fig.26 Temperature Derating Curve Note) Values are actual measurements and are not guaranteed. Power dissipation values vary according to the board on which the IC is mounted. www.rohm.com 2010.03 - Rev.A 24/25 © 2010 ROHM Co., Ltd. All rights reserved.
  • Page 25 +0.1 0.17 −0.05 Direction of feed 0.38±0.1 1pin ∗ Reel (Unit : mm) Order quantity needs to be multiple of the minimum quantity. www.rohm.com 2010.03 - Rev.A 25/25 © 2010 ROHM Co., Ltd. All rights reserved.
  • Page 26 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.