PDF BH3856S Data sheet ( Hoja de datos )

Número de pieza	BH3856S
Descripción	2-wire serial sound control IC
Fabricantes	ROHM Semiconductor
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No Preview Available ! Audio ICs BH3856S / BH3856FS 2-wire serial sound control IC BH3856S / BH3856FS The BH3856S and BH3856FS are signal processing ICs designed for volume and tone control in televisions, mini component stereo systems, and other audio products. Their two-line serial control (I2C BUS) enables them to control volume and tone on the basis of signals from a microcomputer, etc. !Applications Televisions, [Video equipped television], personal computer televisions, mini component stereo systems, car stereos. !Features 1) I2C BUS facilitates direct serial control from a microcomputer of volume (main volume), balance (left / right), and tone (bass, treble). DC control is also possible. 2) Volume is produced by a low-distortion, low-noise VCA. Designed to minimize step noise. 3) Stable standard voltage supply and built-in I/O buffer mean that few attachments are needed. SSOP-A32 package designed to save space. 4) Matrix surround yields powerful sound. !Absolute maximum ratings (Ta = 25°C) Parameter Symbol Power supply voltage Power dissipation Operating temperature BH3856S BH3856FS Vcc Pd Topr Storage temperature Tstg ∗1 Reduced by 12mW for each increase in Ta of 1°C over 25°C. ∗2 Reduced by 6.8mW for each increase in Ta of 1°C over 25°C. Limits 10.0 1200∗1 850 ∗2 −40~+85 −55~+150 Unit V mW °C °C !Recommended operating conditions (Ta = 25°C) Parameter Power supply voltage Symbol Min. Typ. VCC 6.0 9 Max. 9.5 Unit V Note : I2C BUS is a registered trademark of Philips. 1 page Audio ICs BH3856S / BH3856FS Symbol Pin voltage Equivalent Circuit VCC Description TVO1 TVO2 OUT1 OUT2 SC BC TC VC1 VC2 Vref SDA SCL SASS VCC A_GND D_GND 4.5V 4.5V A_GND VCC 25kΩ 9pin 24pin Pin for high band filter connection. 4.5V 4.5V − 3.8V − − − − 10pin Main volume output pin. 24pin OUT1 is the volume output for Channel 1. OUT2 is the volume output for Channel 2. A_GND VCC Digital VREF 12pin 19pin 20pin 22pin 21pin A_GND VCC 18pin A_GND VCC 13pin 15pin 17pin 2kΩ A_GND Power supply voltage pin. Analog GND pin. Connected to IC board. Digital GND pin. Separate from Analog GND pin. For prevention of shock noise during step switching. SC : Surround pin BC : Bass pin TC : Treble pin VC1 : Volume pin (Channel 1) VC2 : Volume pin (Channel 2) 3.8V regulator output pin. Output requires capacitor for stopping oscillation. Output pin has built-in precharge and discharge circuits, so there is no problem with start-up or shut-down even with a large capacitor. This pin is for connection to the high-band filter. · I2C bass input pin SDA : serial data line SCL : serial clock line · Slave address selection pin SASS: slave address selection switch ∗The pin numbers are for the BH3856S. 5 Page Audio ICs BH3856S / BH3856FS (8) Volume attenuation (reference values) ATT DATA (dB) (HEX) 0 FF −1 E4 −2 D8 −3 CF −4 C8 −5 C2 −6 BD −7 B8 −8 B2 −9 AD −10 A9 −11 A5 −12 A0 −13 9C −14 98 −15 94 −16 90 −17 8C −18 89 ATT DATA (dB) (HEX) −19 85 −20 82 −22 7C −24 78 −26 74 −28 70 −30 6D −32 6A −34 68 −36 65 −38 61 −40 5C −42 59 −44 55 −46 52 −48 4E −50 4B −52 48 −54 45 ATT (dB) −56 −58 −60 −62 −64 −66 −68 −70 −72 −74 −76 −78 −80 −82 −84 −86 −90 −100 −112 Note : All figures in this table are reference values. When using this IC, check this table carefully and perform the appropriate setting. DATA (HEX) 42 3F 3C 39 36 34 32 2F 2D 2A 28 26 24 22 20 1E 1A 13 00 (9) Bass / Treble gain settings (reference values) ATT (dB) 15 DATA (HEX) 3F ATT DATA (dB) (HEX) 0 1F 14 38 −1 1C 13 35 −2 1B 12 33 −3 19 11 31 −4 18 10 2F −5 17 9 2E −6 16 8 2D −7 15 7 2C −8 13 6 2B −9 12 5 2A −10 11 4 29 −11 0F 3 27 −12 0D 2 26 −13 0B 1 25 −14 08 0 1F −15 05 Notes : (1) The gain values in the treble and bass data setting tables above are based on the assumption that the filter constants have been set so that maximum and minimum gain are equal to the peak and bottom values listed in the frequency characteristics drawings. (2) All figures in this table are reference values. When using this IC, check this table carefully and perform the appropriate setting. 11 Page

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