BH3854AS Rohm, BH3854AS Datasheet
BH3854AS
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BH3854AS Summary of contents
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... Serial sound control IC BH3854AS / BH3854AFS The BH3854AS and BH3854AFS are signal processing ICs designed for volume and tone control in CD radio cassettes and other audio products. Their three-line serial control enables them to control volume and tone on the basis of signals from a microcomputer, etc. ...
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... Audio ICs FBlock diagram FPin descriptions 634 BH3854AS / BH3854AFS ...
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... SAfter the pins are reset, until the Vcc voltage setting for this IC (BH3854) is reached and the next data Sis input, the pins only operate while the CK, DATA, and LATCH lines are all maintained at LOW. SBe sure that no more than 9V is applied to any of the output pins. BH3854AS / BH3854AFS = 8V 1kHz 20kHz, CC ...
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... Audio ICs FMeasurement circuit 636 BH3854AS / BH3854AFS ...
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... Audio ICs FOperation of measuring circuit switches BH3854AS / BH3854AFS 637 ...
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... Audio ICs FPin descriptions 638 BH3854AS / BH3854AFS ...
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... Audio ICs BH3854AS / BH3854AFS 639 ...
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... Make the end of each control command LOW. FVolume data settings (reference values) 640 BH3854AS / BH3854AFS (5) The MUTE function can be controlled externally if the VC (volume control) pin is configured as shown in the dia- gram above. Attenuation is equal to the figure for attenu- ation when volume ...
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... Audio ICs BH3854AS / BH3854AFS 641 ...
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... Audio ICs FTreble settings (reference values) Treble data 642 BH3854AS / BH3854AFS Bass data ...
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... Audio ICs FApplication example BH3854AS / BH3854AFS 643 ...
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... The gain can be set by R and the 20k . 20k ) / R VC Note: Set C (input coupling) and C (used to set the gain) depending the frequency band used. (3) Bass filter 644 BH3854AS / BH3854AFS (1) The BPF is composed of a multifeedback active filter. f can be varied according to the value (theoretical equation ...
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... Reference values are listed below, but be aware that actual values vary for different products. (Reference values) At attenuation of 0dB, tone control width is "15.0dB. At attenuation of *40dB, tone control width is "13.5dB. BH3854AS / BH3854AFS (6) Signal level setting The following figure represents the standard setting for the BH3854A. ...
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... BH3854AS / BH3854AFS (10 separation With this IC (BH3854AS / AFS), the analog and digital systems are completely separated in the power supply and GND. Within the digital system, there is a stable built- in standard voltage supply, all of which is supplied via the VREF (pin 17, 3 ...
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... the wiring to the analog GND and digital GND is long, make sure that no poten- tial difference arises between the two GNDs. (15) BH3854AS ! BH3854AFS: Differences S The bass filter R constant changes from 100 changes from 70Hz ! k ...