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BA7181FS Datasheet(Fiches technique) 1 Page - Rohm

Numéro de pièce BA7181FS
Description  2-channel PRE / REC amplifier with auto-tracking interface
Télécharger  8 Pages
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Fabricant  ROHM [Rohm]
Site Internet  http://www.rohm.com
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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
Unit
Applied voltage
Power dissipation
Operating temperature
Storage temperature
VCC
7.0
V
Pd
937.5
mW
Topr
°C
Tstg
°C
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.
– 20 ~ + 65
– 55 ~ + 150
Recommended operating (Ta = 25°C)
Parameter
Symbol
Min.
Typ.
Max.
Unit
Conditions
Playback / recording (voltage range)
VCC
4.5
5.0
5.5
V
11pin
Not designed for radiation resistance.




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