BH3857AFV Rohm, BH3857AFV Datasheet
BH3857AFV
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BH3857AFV Summary of contents
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... Audio ICs Audio sound controller BH3857AFV The BH3857AFV is a signal-processing IC for controlling audio quality in CD radio-cassette players and mini-component stereo systems. Three-line serial control is available making it easy to adjust tone and volume using a microprocessor. FApplications Mini-component stereo systems, CD radio cassette play- ers, car audio systems and TVs. ...
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... Audio ICs FBlock diagram Control of volume, bass, treble and surround 2 can also be done by external application voltage to the VC (volume), BC (bass), TC (treble) and SC (surround 2) terminals. The impedance of the VC, TC, and BC terminals is 10k (Typ.). The impedance of the SC terminal is 200k (Typ.). BH3857AFV 665 ...
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... Audio ICs FPin descriptions 666 BH3857AFV ...
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... Audio ICs FElectrical characteristics (unless otherwise noted 25_C, V VOL = MAX, Tone = ALL FLAT 8V 1kHz 20Hz to 20kHz 600 , R = 10k , INPUT_AMP_GAIN = 0dB BH3857AFV 667 ...
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... Audio ICs FMeasurement circuit 668 BH3857AFV ...
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... The outputs are on when the bit data is 1, and off when Apply the following data for chip select and parity. D18 : Surround matrix 1 control D19 : Surround matrix 2 control BH3857AFV 669 ...
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... Audio ICs (2) Logic input terminals Logic input terminals have a bipolar construction, so take care with regard to source current. (3) Timing chart The timing chart is shown in Fig. 3. Timing (recommended conditions) Timing chart constants 670 Fig.3 BH3857AFV ...
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... Audio ICs (4) Data table The transmission data is given in the table below. Volume data settings (reference values) BH3857AFV 671 ...
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... Audio ICs Bass and treble settings (reference values) Treble data 672 Bass data BH3857AFV ...
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... Audio ICs FApplication example BH3857AFV 673 ...
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... S The input impedance is 47k . S A buffer if R and C are not present The gain can be set by R and the 20k . = (R ) 20k ) / Note: Set C (input coupling) and C 2 gain) depending on the frequency band used. BH3857AFV (used to set the 1 ...
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... Reference values are given be- low. Note, however, that the actual values will vary due to dif- ferences in individual components. Reference values : Tone control width at 0dB volume attenuation : 15.0dB Tone control width at *40dB volume attenuation : 13.5dB Tone control width at *60dB volume attenuation : 12.0dB . 3 BH3857AFV 675 ...
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... Audio ICs (4) Surround matrix (1) Surround 1 Circuit example S Gain setting S Mixing signal frequency characteristic settings 676 BH3857AFV ...
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... SC (pin 25) terminal, so with regard to DC control, we recommend direct control with the voltage source. When using variable volume, take the impedance into consideration when making the setting. Note: The DC control voltage range not apply voltages above V BH3857AFV (pin ref . ref to the terminals. ref ...
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... Audio ICs FElectrical characteristic curves FExternal dimensions (Units: mm) 678 BH3857AFV ...