BA7181
| Model | BA7181 |
| Description | 2-channel PRE / REC amplifier with auto-tracking interface |
| PDF file | Total 8 pages (File size: 97K) |
| Chip Manufacturer | ROHM |
Video ICs
2-channel PRE / REC amplifier with
auto-tracking interface
BA7181FS
The BA7181FS is a PRE / REC amplifier developed for use in video cassette recorders. It has been designed for use
in two-head decks and features built-in FB damping, two preamplifiers, a chroma output amplifier, an FM output
amplifier (with AGC), an envelope detector, a constant-current BTL-drive REC amplifier (with AGC)and built-in chan-
nel and REC / PB switches on a single monolithic IC.
•
Applications
VCRs
•
Features amplifier has a total gain of 57dB
1) The playback
(Typ.), and has a low-noise preamplifier. Designed
for VHS-band operation with low external parts
count. The IC has two circuits for two-head VCR
applications.
2) Two playback output systems (through output and
AGC output). The AGC output level is 300mV
P-P
(Typ.);
suitable for FM brightness signal output.
3) Auto-tracking interface is provided for automated
tracking adjustment. The detector characteristic is
linear, and the sensitivity can be adjusted using
external components.
4) The recording amplifier uses constant-current BLT
drive that handles load variations (i.e. head imped-
ance)well, and gives stable recording characteris-
tics. A single circuit is provided for two-head VCR
use.
5) Built-in recording level AGC means adjustment of
FM recording current is not necessary.
6) Head switches for two-channel PRE / REC system
provided.
7) Operates off a single 5V power supply, with low
power dissipation.
•
Absolute maximum ratings (Ta = 25°C)
Parameter
Applied voltage
Power dissipation
Operating temperature
Storage temperature
Symbol
V
CC
Pd
Topr
Tstg
Limits
7.0
937.5
∗
– 20 ~ + 65
– 55 ~ + 150
Unit
V
mW
°C
°C
∗
When mounted on a 90mm
×
50mm, t = 1.6mm glass epoxy board.
Reduced by 7.5mW for each increase in Ta of 1°C over 25°C.
•
Recommended operating (Ta = 25°C)
Parameter
Playback / recording (voltage range)
Not designed for radiation resistance.
Symbol
V
CC
Min.
4.5
Typ.
5.0
Max.
5.5
Unit
V
Conditions
11pin
1
