BA7795FS View Datasheet(PDF) - ROHM Semiconductor
Part Name
Description
Manufacturer
BA7795FS Datasheet PDF : 12 Pages
| |||
Video ICs
BA7795LS / BA7795FS
(3) Playback operation
The signal applied to PB IN is amplified by playback
equalizer amplifier. At this time, the REC HEAD switch
is switched on by a control signal to REC / EE, and the
potential on one side of the head is fixed at GND . The
playback equalizer amplifier gain and equalizer charac-
teristics are set externally. The playback level is set by
the resistor divider between PB OUT and the playback
line input, The signal to the playback line input passes
though the input switch, is amplified by 20dB in the line
amplifier, and is output to the output buffer (the voltage
gain is different to that for the LINE input and TUNER
input).
It is possible to switch between the input block head
equalizer resonance point and playback equalizer char-
acteristic using the EQ CTRL control signal.
The line output can be stopped by setting muting mode
on using the MUTE CTRL signal. The ALC circuit and
recording amplifier are stopped in playback mode.
Signal flow for playback operation
1
3
22µ
33µ
5
VCC
7
EQ CTRL
9
PB / TU / EE
CTRL
11
39k
13
8.2k
15
MUTE
CTRL
17
1.5k
19
15k
+
21
10µ
23
BIAS
OSC
REC + B
3.3µ
+
2
22µ 330k
4
+
ALC
+ 28dB
LINE
REC
– 20dB
BA7795LS
6
330k
8
12k
8.2k
10
4.7k
0.1µ
12
+ 47µ
0.01µ
4.7k
14
2.2M
16
0.1µ
18
0.1µ
20
4.7k
22 +
10µ
24
LINE IN
TUNER IN
LINE OUT
REC / EE CTRL
Units: R [Ω]
C [F]
∗ The BA7795FS has a different pin layout to the BA7795LS.
Fig. 4 Signal flow for playback
7
Share Link: 