BA7184
| Model | BA7184 |
| Description | 4-channel PRE / REC amplifier with auto-tracking interface |
| PDF file | Total 8 pages (File size: 122K) |
| Chip Manufacturer | ROHM |
Video ICs
4-channel PRE / REC amplifier with
auto-tracking interface
BA7184S
The BA7184S is a PRE / REC amplifier developed for use in video cassette recorders. It is compatible with four-head
decks and features built-in FB damping, four preamplifiers, a chroma output amplifier, an FM output amplifier (with
AGC), an envelope detector and envelope comparator, a constant-current BTL-drive REC amplifier (with AGC) and
channel switching, EP / SP switching, and mode switching integrated onto a single monolithic IC.
•
Applications
VCRs
•
Features amplifier has a total gain of 56dB
1) The playback
(Typ.), and has a low-noise preamplifier. Designed
for VHS band operation with low external parts
count. The IC has 4 circuits for 4-head VCR applica-
tions.
2) Two playback output systems (through output and
AGC output). The AGC output level is 315mV
P-P
(Typ.); suitable for FM brightness signal output.
3) Auto-tracking interface for automated tracking
adjustment. Linear detector characteristic with sen-
sitivity that can be set using external components.
4) The recording amplifier uses constant-current BLT
drive that handles load variations (i.e. headimped-
ance) well, and gives stable recording characteris-
tics. 2 circuits are provided for 4-head VCR use.
5) Built-in recording level AGC means adjustment of
FM recording current is not necessary.
6) Head switches for 4-channel PRE / REC system
provided.
7) Operates off a single 5V power supply, with low
power dissipation.
•
Absolute maximum ratings (Ta = 25°C)
Parameter
Applied voltage
Power dissipation
Operating temperature
Storage temperature
Symbol
V
CC
Pd
Topr
Tstg
Limits
7.0
1050
∗
1
– 20 ~ + 65
– 55 ~ + 125
Unit
V
mW
°C
°C
∗
1 Reduced by 10.5mW for each increase in Ta of 1°C over 25°C (free air).
•
Recommended operating conditions (Ta = 25°C)
Parameter
Playback / recording
Symbol
V
CC
Min.
4.5
Typ.
5.0
Max.
5.5
Unit
V
Conditions
13pin
Not designed for radiation resistance.
1
