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PDF BA7181 Data sheet ( Hoja de datos )
| Número de pieza | BA7181 | |
| 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
BA7181FS
The BA7181FS 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 57dB
(Typ.), and has a low-noise preamplifier. Designed
for VHS-band operation with low external parts
count. The IC has two circuits for two-head VCR
applications.
2) Two playback output systems (through output and
AGC output). The AGC output level is 300mVP-P(Typ.);
suitable for FM brightness signal output.
3) Auto-tracking interface is provided for automated
tracking adjustment. The detector characteristic is
linear, and the sensitivity can be adjusted using
external components.
4) The recording amplifier uses constant-current BLT
drive that handles load variations (i.e. head imped-
ance)well, and gives stable recording characteris-
tics. A single circuit is provided for two-head VCR
use.
5) Built-in recording level AGC means adjustment of
FM recording current is not necessary.
6) Head switches for two-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 937.5∗
Operating temperature
Topr
– 20 ~ + 65
Storage temperature
Tstg – 55 ~ + 150
∗ When mounted on a 90mm × 50mm, t = 1.6mm glass epoxy board.
Reduced by 7.5mW for each increase in Ta of 1°C over 25°C.
Unit
V
mW
°C
°C
•Recommended operating (Ta = 25°C)
Parameter
Symbol
Playback / recording (voltage range)
VCC
᭺Not designed for radiation resistance.
Min.
4.5
Typ.
5.0
Max.
5.5
Unit Conditions
V 11pin
1
1 page  
Video ICs
(Recording system)
BA7181FS
VCC 5V
+
20 19 18 17 16 15 14 13 12 11
DET
AGC
HPF
ENVE MUTE VCC
PEAK
REC
RF
AGC
–
PRE
–
PRE
+
DET
LOGIC
1 2 3 4 5 6 7 8 9 10
AT ENVE GAIN
EP “H”
Fig.2
Units: R [Ω]
C [F]
L [H]
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet BA7181.PDF ] | |
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