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BH7800K Datasheet

  • BH7800K

  • Single chip Hi-Fi audio signal processor

  • 13頁

  • ROHM

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Video ICs
Single chip Hi-Fi audio signal
processor
BH7800K
The BH7800K 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 SSB (Synchronized Serial 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 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
f
SC
(NTSC: 3.59545MHz, 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)
Parameter
Symbol
V
CC
Applied voltage
V
EE
V
IN
V
IN
Power dissipation
Operating temperature
Storage temperature
Pd
Topr
Tstg
Limits
18, 36pin 路路路路路路路路路路路路路路路路路路路路路路路路路路路 6.0
39pin 路路路路路路路路路路路路路路路路路路路路路路路路路路路路路路 鈥?6.0
5, 6, 32pin 路路路路路路路路路路路路路路路路路路路路路路路路 6.5
Pins other than the above 路路路 6.0
850
鈭?/div>
鈥?10 ~ + 70
鈥?55 ~ + 125
Unit
V
V
V
V
mW
擄C
擄C
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.
1

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