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PDF BA7180AFS Data sheet ( Hoja de datos )

Número de pieza BA7180AFS
Descripción 2-channel PRE / REC amplifier with auto-tracking interface
Fabricantes ROHM Semiconductor 
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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
1) The playback amplifier has a total gain of 57dB (Typ.),
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 300mVP-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
Symbol
Limits
Unit
Power supply voltage
BA7180AS
Power dissipation
BA7180AFS
VCC
Pd
7.0
10001
937.52
V
mW
Operating temperature
Topr
– 20 ~ + 65
°C
Storage temperature
Tstg – 55 ~ + 150 °C
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
Symbol Min. Typ.
Playback / recording
VCC 4.5 5.0
Max.
5.5
Unit
V
1

1 page




BA7180AFS pdf
Video ICs
Measurement circuits
BA7180AS (playback system)
BA7180AS / BA7180AFS
+
22 21 20 19 18 17 16 15 14 13 12
AGC
DET
HPF
DET
HPF
MUTE
VCC
REC
RF
PRE
PRE
AGC
+
PRE / REC
LOGIC
DET
1 2 3 4 5 6 7 8 9 10 11
Fig.1
Units: R []
C [F]
L [H]
5

5 Page





BA7180AFS arduino
Video ICs
BA7180AFS
BA7180AS / BA7180AFS
+
20 19 18 17 16 15 14 13 12 11
AGC
DET
HPF
DET
HPF
MUTE
REC
VCC
RF
PRE
PRE
AGC
+
PRE / REC
LOGIC
DET
1 2 3 4 5 6 7 8 9 10
Fig.6
Units: R []
C [F]
L [H]
11

11 Page







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