Audio ICs
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.
Applications
CD radio cassettes, mini component stereo systems, car stereos
Features
1)They facilitate direct serial control from a microcomputer of volume (main volume) 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)Input amp can be used for gain adjustment, and matrix surround yields powerful sound.
4)Stable standard voltage supply and built-in I / O buffer mean that few attachments are needed. SSOP32 package designed to save space.
5)Open collector has four outputs, which makes logic control possible.
6)Excellent for volume and tone control devices in CD radio cassettes, micro components, car stereos, televisions, etc.
7)Digital GND pin and analog GND pin are separated with an impedence of more than 1MΩ.
Absolute maximum ratings (Ta = 25 C)
Recommended operating conditions (Ta = 25 C)
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BH3854AS / BH3854AFS |
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Block diagram
Pin descriptions
634
Audio ICs |
BH3854AS / BH3854AFS |
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Electrical characteristics |
(unless otherwise noted, Ta = 25_C, VCC = 8V, f = 1kHz, BW = 20 20kHz, |
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VOL = Max., TONE = ALL FLAT, Rg = 600Ω, RL = 10kΩ, INPUT AMP GAIN = 0dB) |
Timing chart constants
Note: About the output pins...
SPins 1 through 4 (pins 12 through 15) are reset when the power is turned ON.
SAfter the pins are reset, until the Vcc voltage setting for this IC (BH3854) is reached and the next data is 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.
635
Audio ICs |
BH3854AS / BH3854AFS |
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Measurement circuit
636
Audio ICs |
BH3854AS / BH3854AFS |
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Operation of measuring circuit switches
637
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