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Video ICs
Two-channel VCR PRE / REC
amplifier for Digital VCRs
BH7272KV
The BH7272KV is a head amplifier developed for use in digital video cassette recorders. Both PB and REC have
excellent frequency characteristics making this IC an ideal choice for digital recording and playback. The small
VQFP48 package facilitates compact design of portable equipment such as video cameras.
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Applications
Digital video cassette recorders
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Features
1) The playback amplifier is a differential amplifier with
an overall gain of 54dB (Typ.), and has low-noise
transistors as the first stage. The feedback circuit is
not included, so provide negative feedback for head
peak damping, and positive feedback to cancel the
input capacitance using external components.
2) The playback AGC amplifier has ± 10dB of control
range.
3) The recording current amplifier is a BLT current
amplifier. Use external components to construct the
head peak damping circuit.
4) Recording limit amplifier is included. Recording AGC
amplifier not included.
5) The signal system VCC is 4.9V, and the control sys-
tem VCC is 3.0V.
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Absolute maximum ratings (Ta = 25°C)
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Recommended operating conditions (Ta = 25°C)
Parameter Symbol Limits Unit
Applied voltage
Power dissipation
Operating temperature
Storage temperature
VCC
Pd
Topr
Tstg
7.0
– 20 ~ + 65
– 55 ~ + 125
V
mW
°C
°C
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When mounted on a 70mm · 70mm · 1.6mm glass epoxy board.
*
Reduced by 9.0mW for each increase in Ta of 1°C over 25° .
*
900
Parameter Symbol Min. Typ. Max. Unit Conditions
Signal system
Control system
VCC 5V
VCC 3V
4.6
2.8
4.9
3.0
5.2
3.2
V
V
14, 19, 38, 47pin
16pin
sNot designed for radiation resistance.