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A840 Schematic ( PDF Datasheet ) - ROHM Semiconductor

Teilenummer A840
Beschreibung CTL recording / playback amplifier for VHS VCRs
Hersteller ROHM Semiconductor
Logo ROHM Semiconductor Logo 




Gesamt 9 Seiten
A840 Datasheet, Funktion
Video ICs
CTL recording / playback amplifier
for VHS VCRs
BA8400FV
The BA8400FV is a CTL recording / playback amplifier developed for VHS VCRs. The playback amplifier has an
AGC circuit that can handle large input signal fluctuations, and a recording / playback switching circuit is provided to
allow high-speed switching.
Applications
VHS-format VCRs
Features
1) Can be operated off low power supply voltage (2.7V
to 3.5V).
2) Playback amplifier with AGC.
3) Fast switching between recording and playback.
Block diagram
1






A840 Datasheet, Funktion
Video ICs
Measurement circuit
SW1
abc
Is1
V
Vm1
1
A Am2
SW2
abc
V
Is2
VCC
A Am3
SW3
abcd
V
Vm3 Vs3
VCC
2
3
4
SW5
abc
+
Is5 10µ
OSC
400
A Am56
5
V
Vm5
6
V
Vm6
7
BA8400FV
VCC
A
P 14 Am14
R
SW
+–
REC
AMP
+–
DET
R AGC
P
R AMP
+–
P
Ref
Fig.9
13
1000p
12
11
+
1µ
SW13a
SW13b
V
Vm13
270k
Vs13
4.7k SW12
1M V
+
10µ
10
9
8
+
1µ
a
330k
SW10
b
12k
V
Vm10
910
a
V
Vm8
820
b
SW9
+
10µ
6

6 Page







SeitenGesamt 9 Seiten
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