来源：深圳市万佳业电子科技有限公司 发布时间：2009/4/16 15:47:15
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BH7775K的产品特征：
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 built-in 2-wire serial control decoder circuit allows serial control of the internal mode settings.
3) Automatic adjusting VCO and BPF circuits that use the color signal subcarrier frequency (NTSC: 3.579545MHz and PAL: 4.433619MHz) ensure stable adjustment that is not effected by stress when the chip is mounted, or variations over time.
4) 4-input switcher (turner, BS, and line 1 and 2). Output switch with built-in STEREO / LEFT / RIGHT switching, Hi-Fi / MIX / NORMAL switching, and BS monitor functions.
5) The PNR processor and FM modulation / demodulation circuit provide reverse characteristics at recording and playback. Also, carrier frequency adjustment and FM de-emphasis / playback level adjustment have been combined.
6) Built-in FM band-pass filter connects directly to the playback amplifier and excels at attenuation of the other channel. The FM recording output circuit has a high-performance high-frequency cutoff filter that produces a sine wave output.
7) Switching noise is reduced by a slope-control type differential compensation circuit.
8) Built-in envelope detector circuit and noise-detecting automatic FM detector circuit.
9) Built-in normal-audio signal processing circuit that allows SP / LP / EP equalizer switching. Control terminal provided for use with the BA7755AF high-voltage head switcher.
BH7775K的技术参数：
| Parameter |
Symbol |
Limits |
Unit |
| Applied voltage |
VCC |
23, 55 pin · · · · · · · · · · 6.0 |
V |
| VEE |
59 pin · · · · · · · · · · · · – 6.0 |
V |
| VIN |
7, 8, 22 pin · · · · · · · · · 6.5 |
V |
| VIN |
Pin other than above · · · · 6.0 |
V |
| Power dissipation |
Pd |
800∗ |
mW |
| Operating temperature |
Topr |
– 10 ~ + 70 |
°C |
| Storage temperature |
Tstg |
– 55 ~ + 125 |
°C |
BH7775K的产品描述：The BH7775K is an audio signal processing system IC that includes a peak-noise reduction (PNR) processor, an FM modulator / demodulator circuit, an input / output switcher, an automatic FM detector circuit, an FM band-pass filter,a normal-audio circuit, a regulator circuit, and automatic adjusting circuits (VCO and BPF).
