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PDF BH7272KV Data sheet ( Hoja de datos )

Número de pieza BH7272KV
Descripción Two-channel VCR PRE / REC amplifier for Digital VCRs
Fabricantes ROHM Semiconductor 
Logotipo ROHM Semiconductor Logotipo



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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.
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
Applied voltage
Power dissipation
VCC
Pd
7.0
900
Operating temperature
Topr
– 20 ~ + 65
Storage temperature
Tstg
– 55 ~ + 125
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° .
Unit
V
mW
°C
°C
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
Not designed for radiation resistance.
Max.
5.2
3.2
Unit Conditions
V 14, 19, 38, 47pin
V 16pin
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BH7272KV pdf
Video ICs
Measurement circuit (recording system)
BH7272KV
36 35 34 33 32 31 30 29 28 27 26 25
37
Vcc 4.9V
38
39
40
0.1µ
41
0.1µ
42
43
44
HEAD SW CTRL
45
PB “H”
46
Vcc 4.9V
47
I0adj
48
3rd
2nd
IAMP
IAMP
PRE
DET
AGC
LIMIT
VAMP
BH7272KV
Balance
Balance
BF
Bias
10k 10k
1k 1k
IAMP
IAMP
PRE
24 LIMIT LEVEL adj
23 LIMIT Vth adj
22
21
20
19 Vcc 4.9V
18 REC GATE
17 REC “H”
16 Vcc 3V
0.1µ
15
14 Vcc 4.9V
13 I0adj
1 2 3 4 5 6 7 8 9 10 11 12
10 10
REC OUT B
REC OUT A
Fig. 2
5

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BH7272KV arduino
Video ICs
BH7272KV
Pin No.
Pin name Pin voltage
32
PB AGC GATE
0.0
(0.0)
Equivalent internal circuit
15k
32
100k
Function
PB AGC detection control
33
MUTE
0.0
(0.0)
15k
33
100k
Playback system mute control
34 N.C. —
3.2
35 PB SW A OUT (–)
36 PB SW B OUT 3.2
(–)
37
GND
——
35 36
Playback system amplifier output
GND for PB amplifier, AGC, and peak
amplifier
38
VCC 5V
2.5
39 PB2nd OUT B (–)
40 PB2nd OUT A 2.5
(–)
380
39 40
The pin voltages in brackets are for REC mode, all others are for PB mode.
VCC for PB amplifier, AGC, and peak
amplifier
Playback system 2nd amplifier output
Playback system 2nd amplifier output
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