BA7180AS Rohm, BA7180AS Datasheet

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BA7180AS

Manufacturer Part Number
BA7180AS
Description
2-channel PRE/REC amplifier with auto-tracing interface
Manufacturer
Rohm
Datasheet
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.
VCRs
1) The playback amplifier has a total gain of 57dB (Typ.),
2) Two playback output systems (through output and
3) Auto-tracking interface for automated tracking
1 Reduced by 10.0mW for each increase in Ta of 1 C over 25 C (free air).
2 When mounted on a 90mm
Applications
Features
Absolute maximum ratings (Ta = 25°C)
Power supply voltage
Power dissipation
Operating temperature
Storage temperature
Recommended operating conditions (Ta = 25°C)
Playback / recording
2-channel PRE / REC amplifier with
auto-tracking interface
BA7180AS / BA7180AFS
Video ICs
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.
AGC output). The AGC output level is 300mV
(Typ.); suitable for FM brightness signal output.
adjustment. The detector characteristic is non-linear
to improve tracking accuracy during playback of low
signal levels.
increase in Ta of 1 C over 25 C.
Parameter
Parameter
BA7180AFS
BA7180AS
90mm, t = 1.6mm glass epoxy board, reduced by 7.5mW for each
Symbol
V
CC
Symbol
Topr
Tstg
V
Pd
CC
Min.
4.5
– 20 ~ + 65
– 55 ~ + 150
Typ.
5.0
Limits
937.5
1000
P-P
7.0
1
2
Max.
5.5
4) The recording amplifier uses constant-current BLT
5) Built-in recording level AGC means adjustment of
6) Head switches for 2-channel PRE / REC system
7) Operates off a sigle 5V power supply, with low
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.
FM recording current is not necessary.
provided.
power dissipation.
Unit
mW
Unit
V
C
C
V
1

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BA7180AS Summary of contents

Page 1

... 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 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. • ...

Page 2

... PRE IN 1 – OUT 1) GND 1 PRE IN 2 – OUT 2) N.C. + OUT DFF IN OUT 1) GND OUT 2) + OUT N.C. BA7180AS / BA7180AFS GND 2 REC LEVEL ADJ N.C. PB AGC OUT PB AGC FILTER H SYNC OUT AT ENVE OUT N.C. REC GND 2 REC LEVEL ADJ N.C. PB AGC OUT ...

Page 3

... Pin 11 DC voltage for PB mode CC 2.2 — 2.8 V Pin 11 DC voltage for REC MUTE mode 0 — 1.2 V Pin 11 DC voltage for REC mode BA7180AS / BA7180AFS = 5.0V and f = 4.0MHz) Conditions (BA7180AS) , pin 1: L, P-P , pin 1: L, P-P – G VP1 VP2 = 0.3mV IN P ...

Page 4

... V Pin 17 DC voltage to maintain recording AGC stopped TH15L = 4.8V and f = 4.0MHz) CC Min. Typ. Max. 1.8 2.3 2.8 3.35 3.6 3.85 BA7180AS / BA7180AFS Conditions (BA7180AS) , pin 9 P-P ~ 250mV P-P P-P guaranteed design value. P-P, 8MHz spurious P-P 12MHz spurious, P-P Unit Conditions (BA7180AS) ...

Page 5

... Video ICs • Measurement circuits BA7180AS (playback system DET AGC HPF RF – PRE PRE Fig.1 BA7180AS / BA7180AFS + MUTE DET REC HPF AGC PRE / REC – + LOGIC DET Units [F] L [H] 5 ...

Page 6

... Video ICs BA7180AS (recording system DET AGC HPF RF – PRE PRE Fig.2 BA7180AS / BA7180AFS + MUTE DET REC HPF AGC PRE / REC + – LOGIC DET Units [F] L [H] ...

Page 7

... Video ICs BA7180AFS (playback system DET AGC HPF RF – – PRE PRE Fig.3 BA7180AS / BA7180AFS + MUTE DET REC HPF AGC PRE / REC + LOGIC DET Units [F] L [H] 7 ...

Page 8

... Video ICs BA7180AFS (recording system DET AGC HPF RF – – PRE PRE Fig.4 BA7180AS / BA7180AFS + MUTE DET REC HPF AGC PRE / REC + LOGIC DET Units [F] L [H] ...

Page 9

... Channel 1 (PRE IN1) (2) H SYNC IN (BA7180AS: pin 17, BA7180AFS: pin 15) • Controls recording AGC detector block operation. Control pin Function H SYNC AGC detector REC CTRL (BA7180AS: pin 11, BA7180AFS: pin 10) • Playback / recording mute / recording mode switching Control pin Mode REC REC MUTE ...

Page 10

... Video ICs • Application examples BA7180AS DET DET AGC HPF HPF RF – – PRE PRE Fig.5 BA7180AS / BA7180AFS + MUTE REC AGC PRE / REC + LOGIC DET Units [F] L [H] ...

Page 11

... Video ICs BA7180AFS DET AGC HPF RF – – PRE PRE Fig.6 BA7180AS / BA7180AFS + MUTE DET REC HPF AGC PRE / REC + LOGIC DET Units [F] L [H] 11 ...

Page 12

... Video ICs • External dimensions (Units: mm) BA7180AS 19.4 0 1.778 0.5 SDIP22 12 BA7180AFS 7. 0.1 BA7180AS / BA7180AFS 8.7 0 0.8 0.36 0.1 0.3Min. SSOP-A20 0.15 ...

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