BA7180AFS
| Model | BA7180AFS |
| Description | 2-channel PRE / REC amplifier with auto-tracking interface |
| PDF file | Total 12 pages (File size: 150K) |
| Chip Manufacturer | ROHM |
Video ICs
2-channel PRE / REC amplifier with
auto-tracking interface
BA7180AS / BA7180AFS
The BA7180AS and BA7180AFS are PRE / REC amplifiers developed for use in video cassette recorders. They
have been designed for use in two-head decks and feature 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 channel and REC / PB switches on a single monolithic IC.
•
Applications
VCRs
•
Features amplifier has a total gain of 57dB (Typ.),
1) The playback
and has a low-noise preamplifier. Designed for VHS-
band operation with low external parts count.The ICs
have 2 circuits for 2-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 for automated tracking
adjustment. The detector characteristic is non-linear
to improve tracking accuracy during playback of low
signal levels.
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 2-head VCR use.
5) Built-in recording level AGC means adjustment of
FM recording current is not necessary.
6) Head switches for 2-channel PRE / REC system
provided.
7) Operates off a sigle 5V power supply, with low
power dissipation.
•
Absolute maximum ratings (Ta = 25°C)
Parameter
Power supply voltage
Power dissipation
BA7180AS
BA7180AFS
Symbol
V
CC
Pd
Topr
Tstg
Limits
7.0
1000
∗
1
937.5
∗
2
– 20 ~ + 65
– 55 ~ + 150
Unit
V
mW
°C
°C
Operating temperature
Storage temperature
∗
1 Reduced by 10.0mW for each increase in Ta of 1°C over 25°C (free air).
∗
2 When mounted on a 90mm
×
90mm, t = 1.6mm glass epoxy board, reduced by 7.5mW for each
increase in Ta of 1°C over 25°C.
•
Recommended operating conditions (Ta = 25°C)
Parameter
Playback / recording
Symbol
V
CC
Min.
4.5
Typ.
5.0
Max.
5.5
Unit
V
1
