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PDF BA7182AS Data sheet ( Hoja de datos )
| Número de pieza | BA7182AS | |
| Descripción | 2-channel PRE / REC amplifier with auto-tracking interface | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
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Video ICs
2-channel PRE / REC amplifier with
auto-tracking interface
BA7182AS
The BA7182AS is a PRE / REC amplifier developed for use in video cassette recorders. It has been designed for use
in two-head decks and features built-in FB damping, two preamplifiers, a chroma output amplifier, an FM output
amplifier (with AGC), an envelope detector, a constant-current BTL-drive REC amplifier (with AGC) and built-in chan-
nel and REC / PB switches on a single monolithic IC.
•Applications
VCRs
•Features
1) The playback amplifier has a total gain of 59dB
(Typ.), and has a low-noise preamplifier. Designed
for VHS-band operation with low external parts
count. The IC has 2 circuits for 2-head VCR applica-
tions.
2) Two playback output systems (throgh output and
AGC output). The AGC output level is 270mVP-P
(Typ.) ; suitable for FM brightness signal output.
3) Auto-tracking interface for automated tracking
adjustment. An integrate and hold detector is used
to reduce the load on the microcontroller.
4) The recording amplifier uses constant-current BLT
drive that handles load variations (i.e. headimped-
ance) well, and gives stable recording characteris-
tics. A single circuit is provided for 2-head VCR use.
5) Built-in recording level AGC means adjustment of
FM recording current is not necessary.
6) Head switches for 2-channel PRE / REC system
provided.
7) Operates off a single 5V power supply, with low
power dissipation.
•Absolute maximum ratings (Ta = 25°C)
Parameter
Symbol
Limits
Applied voltage
Power dissipation
VCC 7.0
Pd 1100∗
Operating temperature
Topr
– 20 ~ + 75
Storage temperature
Tstg – 55 ~ + 125
∗ Reduced by 11mW for each increase in Ta of 1°C over 25°C (free air).
Unit
V
mW
°C
°C
•Recommended operating conditions (Ta = 25°C)
Parameter
Symbol Min. Typ. Max.
Playback / recording VCC
4.5 5.0 5.5
᭺Not designed for radiation resistance.
Unit Conditions
V 12pin
1
1 page  
Video ICs
•Measurement circuits
(Playback system)
DFF IN
PRE IN 1
1k
10
1
0.1µ
2
0.1µ
3
0.1µ
4
0.1µ
5
6
10
PRE IN 2
1k
7
0.1µ
8
0.1µ
0.01µ
REC LEVEL ADJ
36k
H SYNC IN
390k
9
10
11
BA7182AS
22
21 EP / SP CTRL
L: SP
20 AT ENVE HOLD OUT
Fig. 1
19 AT ENVE DET ADJ
2.0V
18
0.1µ
PB RF OUT
17
0.1µ
16 REC IN
0.1µ
33k PB / EE / REC CTRL
15 L: REC MUTE
L: REC START
14 PB AGC OUT
0.1µ
3k
13
0.022µ
12
+
68p 300
VCC 5V
Units: R [Ω]
C [F]
L [H]
5
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet BA7182AS.PDF ] | |
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