BH7801BK Datasheet

IC型號(hào)：
BH7801BK
PDF描述：
Single chip Hi-Fi audio signal processor
文件大小：
184.62KB
PDF頁數(shù)：
14頁
芯片廠家：
ROHM

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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.

鈥?/div>

Applications

VCRs

鈥?/div>

Features off dual 鹵 power supply which allows a

1) Operates

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 I

C 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

(NTSC: 3.579545MHz, PAL: 4.433619MHz) and

auto-adjusting BPF circuit ensure stable adjustment

with no fluctuation due to mounting stress or time.

鈥?/div>

Absolute maximum ratings (Ta = 25擄C)

Parameter

Symbol

Applied voltage

Power dissipation

Operating temperature

Storage temperature

Topr

Tstg

Limits

18, 36pin

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6.0

39pin

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鈥?6.0

Unit

擄C

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6.5

Pins other than the above

路路路

6.0

5, 6, 32pin

850

鈭?/div>

鈥?10 ~ + 70

鈥?55 ~ + 125

鈭?/div>

Reduced by 8.5mW for each increase in Ta of 1擄C over 25擄C when mounted on a 70mm

脳

70mm, t = 1.6mm glass epoxy board.

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