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BH7802K

Rohm
Part Number BH7802K
Manufacturer Rohm
Description Single chip Hi-Fi audio signal processor
Published Mar 23, 2005
Detailed Description Video ICs Single chip Hi-Fi audio signal processor BH7802K The BH7802K incorporates the functions for a VHS audio signa...
Datasheet PDF File BH7802K PDF File

BH7802K
BH7802K

Overview
Video ICs Single chip Hi-Fi audio signal processor BH7802K The BH7802K incorporates the functions for a VHS audio signal processing system on a single chip.
The circuits on the chip are a peak-noise reduction processor (PNR), an FM modulator / demodulator circuit, an I / O switcher, an automatic FM detector circuit, an FM bandpass filter, and a regulator circuit.
Applications • VCR S Features • 1) Operates off dual ± power supply which allows a large reduction in the number of coupling capacitors required.
A built-in regulator makes it easy to construct a power supply system.
2) A two-line I2C bus control decoder circuit is provided, allowing the various IC modes to be set using serial control.
3) A four line input switcher is included (tuner, BS, and line 1 / 2).
The output switcher can switch between STEREO, LEFT, and RIGHT, and Hi-Fi, MIX, and NORMAL, and a BS MONITOR function is also provided.
The MIX AMP is AV-LINK compatible.
4) The PNR processor and FM modulator / demodulator circuit have reversed characteristics at recording and playback.
In addition, the adjustment for carrrier frequency and FM deviation / playback level are common.
5) The built-in bandpass filter excels at attenuation of other channels, and can be directly coupled to the playback amplifier.
The FM recording output block has a high-performance low-pass filter to produce sine wave output.
6) Slope-control-type FM-switching-noise compensation circuit.
7) Envelope detector circuit and noise-detector-type automatic FM detector circuit.
8) VCO that uses the color signal sub-carrier frequency fsc (NTSC: 3.
579545MHz, PAL: 4.
433619MHz) and auto-adjusting BPF circuit ensure stable adjustment with no fluctuation due to mounting stress or time.
•Absolute maximum ratings (Ta = 25°C) Parameter Symbol VCC Applied voltage VEE VIN VIN Power dissipation Operating temperature Storage temperature Pd Topr Tstg Limits 18, 36pin······························ 6.
0 39pin································· – 6.
0 5...


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