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BH7272KV Datasheet

  • BH7272KV

  • Two-channel VCR PRE / REC amplifier for Digital VCRs

  • 14頁

  • ROHM

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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.
鈥?/div>
Applications recorders
Digital video cassette
鈥?/div>
Features amplifier is a differential amplifier with
1) The playback
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 鹵 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 V
CC
is 4.9V, and the control sys-
tem V
CC
is 3.0V.
鈥?/div>
Absolute maximum ratings (Ta = 25擄C)
Parameter
Applied voltage
Power dissipation
Operating temperature
Storage temperature
Symbol
V
CC
Pd
Topr
Tstg
Limits
7.0
鈭?/div>
900
Unit
V
mW
擄C
擄C
鈥?20 ~ + 65
鈥?55 ~ + 125
鈭?/div>
When mounted on a 70mm
脳
70mm
脳
1.6mm glass epoxy board.
鈭?/div>
Reduced by 9.0mW for each increase in Ta of 1擄C over 25擄 .
鈥?/div>
Recommended operating conditions (Ta = 25擄C)
Parameter
Signal system
Control system
Symbol
V
CC
5V
V
CC
3V
Min.
4.6
2.8
Typ.
4.9
3.0
Max.
5.2
3.2
Unit
V
V
Conditions
14, 19, 38, 47pin
16pin
Not designed for radiation resistance.
1

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