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PDF BA7795FS Data sheet ( Hoja de datos )
| Número de pieza | BA7795FS | |
| Descripción | VCR standard audio signal processor | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
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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.
1
1 page  
Video ICs
•Measurement circuit
BA7795LS
1
AC BIAS IN
3
5
VCC
7
EQ CTRL
PB / TU / EE
CTRL
R2
9
11
13
15
MUTE CTRL
ON: GVEREC
17
19
REC OUT
4.7k
21 REC
23
ALC
+ 28dB
LINE
– 20dB
BA7795LS / BA7795FS
2 PB IN
ON: GVOPB
4
+
6
8
10
4.7k
4.7k
12
47µ
2.2M
14
ON: ALC OFF
16 LINE IN
4.7k
18 TUNER IN
4.7k
20
4.7k
RL
22 LINE OUT
24 REC / EE CTRL
Fig. 2
Units: R [Ω]
C [F]
∗ The BA7795FS has a different pin layout to the BA7795LS.
5
5 Page 
Video ICs
BA7795LS / BA7795FS
•Electrical characteristic curves
40
VCC = 9V
ALC; OFF
30
20
10
0
10
VCC = 9V
f = 1kHz
0 13 15
R1 5.6kΩ
– 10
R1 = 12kΩ
R1 = 18kΩ
R1 = 39kΩ
– 20
100 1k
10k 100k
FREQUENCY: f (Hz)
1M
Fig. 8 Gain vs. frequency (PB amplifier)
– 30
– 40
– 30 – 20 – 10 0
INPUT LEVEL: VIN (dBV)
10
Fig. 9 Line amplifier ALC input / output
characteristics
20
10
0
VCC = 9V
(ALC; OFF)
– 10 f = 1kHz
THD = 1%
(0.4 ~ 30kHz)
– 20 +10µ
LINE RL
100 200 500 1k 2k
5k 10k
OUTPUT IMPEDANCE RL (Ω)
Fig. 10 Line amplifier load drive
characteristics
100
80
60
40
20
GVO
PB
SW
26
8 10
8.2k
330k 12k
∗33+0
0.01µ
22µ
BA7795LS
EP (SW: OFF)
SP (SW: ON)
0
100 1k 10k 100k 1M 10M
FREQUENCY: f (Hz)
Fig. 11 Playback amplifier frequency
characteristics
10
0
– 10 VCC = 9V
– 20 ALC; OFF
– 30 DIN AUDIO
– 40
– 50
– 60
– 70 TU→LINE
– 80
– 90
– 100
– 110
10
100
1k
LINE
PB→LINE
MUTE
10k 100k
FREQUENCY: f (Hz)
Fig. 12 Line amplifier crosstalk
– 70
– 80
– 90
– 100
100 200 500
DIN AUDIO
VCC = 9V
CIN = 4.7µF
1k 2k 5k 10k
INPUT IMPEDANCE: Rg (Ω)
Fig. 13 Playback amplifier output
noise characteristics
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet BA7795FS.PDF ] | |
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