BA7795LS Datasheet, PDF (1/12 Pages) Rohm – VCR standard audio signal processor

Video ICs
VCR standard audio signal processor
BA7795LS / BA7795FS
The BA7795LS and BA7795FS are standard audio signal processor ICs. They contain a playback preamplifier, line
amplifier, recoeding amplifier, ALC circuit, EQ switch circuit and high-voltage head switch, and provide all of the functions
required for normal-audio signal processing on a single IC with a minimum number of external components required.
•^Applications
Video cassette recorders and tape decks
•^Features
1) Available in compact SZIP and SSOP-A24-pin pack-
ages.
2) High-with standing-voltage head switch (AC with
standing voltage: Min. 80VP-P (f = 70kHz) ).
3) Simple, three-mode EQ switch built-in (BA7795LS).
4) Built-in LINE / TUNER selector switch.
5) High-performance low-noise playback amplifier.
Input conversion noise figure – 122dBV
(Typ. Rg = 680, DIN AUDIO).
6) ALC level can be varied.
7) ALC loop external mute eliminates audible noise at
power on, and ALC attack noise.
8) Signal processing circuit can be constructed with the
addition of just a few external components.
•^{Block diagram}
HEAD EQ 1
REC HSW 3
RIPPLE FILTER 5
VCC 7
EQ CTRL 9
PB / TU / EE CTRL ¹¹
ALC LEVEL 13
BIAS ¹⁵
MUTE CTRL 17
REC NFB 19
REC OUT 21
REC EQ ²³
REC
ALC
+ 20dB
LINE
– 20dB
BA7795LS
2 PB IN
4 GND
6 PB NFB
8 PB EQ
10 PB OUT
12 PB LINE IN
14 ALC FILTER
16 LINE IN
18 TUNER IN
20 GND
22 LINE OUT
24 REC / EE CTRL
∗ The BA7795FS has a different pin
layout to the BA7795LS.
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