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BH7801BK Fiches technique(PDF) 1 Page - Rohm |
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BH7801BK Fiches technique(HTML) 1 Page - Rohm |
1 / 14 page 1 Video ICs Single chip Hi-Fi audio signal processor BH7801BK The BH7801BK 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. 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 con- struct a power supply system. 2) A two-line I2C BUS control decoder circuit is provid- ed, 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 STREO, LEFT, and RIGHT, and Hi-Fi, MIX, and NORMAL, and a BS MONITOR function is also pro- vided. 4) The PNR processor and FM modulator / demodula- tor circuit have reversed characteristics at recording and playback. In addition, the adjustment for carrier 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 compensa- tion 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. •Features •Applications VCRs •Absolute maximum ratings (Ta = 25°C) Parameter Applied voltage Storage temperature VCC VEE VIN Tstg 18, 36pin ······················· 6.0 39pin ························· – 6.0 5, 6, 32pin ···················· ··· 6.5 Pins other than the above 6.0 – 55 ~ + 125 V Symbol Limits Unit V V VIN V Power dissipation Pd 850∗ mW Operating temperature Topr – 10 ~ + 70 °C °C ∗ Reduced by 8.5mW for each increase in Ta of 1°C over 25°C when mounted on a 70mm × 70mm, t = 1.6mm glass epoxy board. |
Numéro de pièce similaire - BH7801BK |
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Description similaire - BH7801BK |
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