BH7272KV Datasheet, PDF (1/14 Pages) Rohm – Two-channel VCR PRE / REC amplifier for Digital VCRs

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.
•^Applications
Digital video cassette recorders
•^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.
•^{Absolute maximum ratings (Ta = 25°C)}
Parameter
Symbol
Limits
Unit
Applied voltage
VCC
7.0
V
Power dissipation
Pd
∗₉₀₀
mW
Operating temperature
Topr
– 20 ~ + 65
°C
Storage temperature
Tstg
– 55 ~ + 125
°C
∗ 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° .
•^{Recommended operating conditions (Ta = 25°C)}
Parameter
Symbol Min. Typ.
Signal system
VCC 5V
4.6
4.9
Control system
VCC 3V
2.8
3.0
á­ºNot designed for radiation resistance.
Max.
5.2
3.2
Unit
Conditions
V 14, 19, 38, 47pin
V 16pin
1