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BA7795FS Fiches technique(PDF) 6 Page - Rohm

No de pièce BA7795FS
Description  VCR standard audio signal processor
Download  12 Pages
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Fabricant  ROHM [Rohm]
Site Internet  http://www.rohm.com
Logo ROHM - Rohm

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6
Video ICs
BA7795LS / BA7795FS
Circuit operation
(1) EE oparation
The input switch is used to select the audio signal input
source (LINE or TUER). This signal is amplified by the
line amplifier (voltage gain: 20dB at 1kHz).
The ALC circuit controls the line amplifier output level.
The ALC level is set externally.
If mute mode is set in this state, the switch that con-
nects the output buffer will go off, but the ALC loop will
not be cut.
(2) Recoeding
In recording mode, the recording amplifier directly con-
nected to the line amplifier operates.
The PB HEAD switch in the playback equalizer amplifi-
er block switches on, and the signal is not input to the
playback equalizer amplifier.
The line amplifier output is attenuated by 20dB before it
is input to the recording amplifier, so if the feedback
components are chosen to given a gain of 20dB, the
same REC OUT output level as the line amplifier can
be obtained.
It is also possible to switch the REC equalizer charac-
teristic to suit the tape speed by switchig the control
signal to EQ CTRL. The recording amplifier gain and
equalizer characteristics are set externally.
Signal flow for EE and recording operation
C [F]
Units: R [
Ω ]
1
3
5
7
9
11
13
15
17
19
21
23
24
22
20
18
16
14
12
10
8
6
4
2
– 20dB
REC
LINE
+ 28dB
EP
22
µ
33
µ
VCC
EQ CTRL
PB / TU / EE
CTRL
39k
8.2k
MUTE
CTRL
1.5k
15k
BIAS
OSC
REC + B
3.3
µ
330
22
µ
0.01
µ
330k
12k
8.2k
4.7k
4.7k
0.1
µ
47
µ
2.2M
LINE IN
TUNER IN
RL
LINE OUT
10
µ
REC / EE
CTRL
BA7795LS
ALC
The BA7795FS has a different pin layout to the BA7795LS.
Fig. 3 Signal flow for EE / recording


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