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BA7357S Datasheet

  • BA7357S

  • VIF / SIF signal processor

  • 178.97KB

  • 15頁

  • ROHM

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Video ICs
VIF / SIF signal processor
BA7357S
The BA7357S is a multi-format (M, B / G, D / K, and I) VIF / SIF signal processor for television and VCR applications.
It features a built-in sound-trap and band-pass filters, and employs a pulse-count audio detector that does not require
adjustment. This IC reduces external component requirements, and allows space savings.
鈥?/div>
Applications
TVs and VCRs
鈥?/div>
Features
1) Separate-carrier PLL with full synchronous detec-
2)
3)
tion. Excellent DG / DP, CS beat (920kHz) and
cross color. In addition, by pulling down the SIF
input (pin 9) it can be used as an intercarrier.
The IF AGC time constant is dual-layered to allow
faster speeds.
The variable-gain amplifier has excellent linearity to
ensure low distortion, and AGC variance and tem-
perature drift have been minimized.
Significant improvement in image quality through
use of a filter that reduces CS beat.
Built-in SOUND filter (4.5MHz SOUND Trap and
4.5MHz SOUND BPF).
The MODE switch can be used to switch the
SOUND filter frequency band to match the transmis-
sion format (M: 4.5, B / G: 5.5, I: 6.0, D / K:
6.5MHz).
6) The audio detector uses a pulse-counter detector
that does not require adjustment, eliminating the
need for a detector coil. Broad S-curve for multiplex
broadcast compatibility.
7) Use of pulse-counter detection and the built-in
SOUND filter means fewer pins, external compo-
nents and adjustment locations are required. The IC
is available in a 22-pin SDIP package and will
enable cost and space savings.
4)
5)
鈥?/div>
Absolute maximum ratings (Ta = 25擄C)
Parameter
Applied voltage
Power dissipation
Operating temperature
Storage temperature
Pin 2 applied voltage
Symbol
V
CCMax.
Pd
Max.
Topr
Limits
10.5
鈭?/div>
1
1250
鈭?/div>
2
鈥?15 ~ + 70
鈥?40 ~ + 150
10.5
Unit
V
mW
擄C
擄C
V
Tstg
V
P2Max.
鈭?/div>
1 24鈩?resistor connected between V
CC
and V
reg
.
鈭?/div>
2 Reduced by 10mW for each increase in Ta 1擄C over 25擄C.
鈥?/div>
Recommended operating conditions (Ta = 25擄C)
Parameter
Power supply voltage (9V)
Power supply voltage (12V)
Guaranteed operating power
supply voltage
Symbol
V
CC9V
V
CC12V
V
CC
Limits
8.8 ~ 9.2
鈭?/div>
1
11.7 ~ 12.3
鈭?/div>
2
8.5 ~ 9.5
鈭?/div>
1
Unit
V
V
V
鈭?/div>
1 24鈩?resistor connected between V
CC
and V
reg.
鈭?/div>
2 56鈩?resistor connected between V
CC
and V
reg.
1

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