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PDF BA7357S Data sheet ( Hoja de datos )

Número de pieza BA7357S
Descripción VIF / SIF signal processor
Fabricantes ROHM Semiconductor 
Logotipo ROHM Semiconductor Logotipo



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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.
Applications
TVs and VCRs
Features
1) Separate-carrier PLL with full synchronous detec-
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.
2) The IF AGC time constant is dual-layered to allow
faster speeds.
3) The variable-gain amplifier has excellent linearity to
ensure low distortion, and AGC variance and tem-
perature drift have been minimized.
4) Significant improvement in image quality through
use of a filter that reduces CS beat.
5) 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.
Absolute maximum ratings (Ta = 25°C)
Parameter
Symbol
Applied voltage
VCCMax.
Power dissipation
PdMax.
Operating temperature
Topr
Limits
10.51
12502
– 15 ~ + 70
Storage temperature
Tstg – 40 ~ + 150
Pin 2 applied voltage
VP2Max.
1 24resistor connected between VCC and Vreg.
2 Reduced by 10mW for each increase in Ta 1°C over 25°C.
10.5
Recommended operating conditions (Ta = 25°C)
Parameter
Symbol
Limits
Power supply voltage (9V)
Power supply voltage (12V)
VCC9V
VCC12V
8.8 ~ 9.21
11.7 ~ 12.32
Guaranteed operating power
supply voltage
VCC 8.5 ~ 9.51
1 24resistor connected between VCC and Vreg.
2 56resistor connected between VCC and Vreg.
Unit
V
mW
°C
°C
V
Unit
V
V
V
1

1 page




BA7357S pdf
Video ICs
BA7357S
Pin No. Pin name IN / OUT Standard voltage
6 VIFB
IN
7 VIFA
4.2V
5
7
8
GND2
0V
9 SIF IN
6.6V
9
10 AFC —
2.7V
10
Equivalent circuit
VCC
1k 1k
Function
Video IF input.
Use with balanced input.
5.3k 5.3k
1k
GND
VCC
20k 15k
SIF and PLL GND.
Audio IF input.
Can set to intercarrier mode by
pulling down via a 2kresistor.
17pF
15k
GND
Terminal for holding the audio
VCC output DC level fixed.
Connect to GND via a 4.7µF
capacitor and to Vreg via a 10µF
3.5V capacitor to reduce BUZZ.
Set this pin to 0.3V or lower to
40k apply Audio / Video Mute.
GND
11 VO4.5M —
5.2V
11
VCC
Sound
Filter
8k
2nd SIF output.
Connect a Trap to this pin to vary
the Sound Filter characteristics.
The internal impedance is a high
(Approximately) 1k, so connect a
Buffer to output.
GND
5

5 Page





BA7357S arduino
Video ICs
Measurement circuit
220k
220k
5.1k
100k
AFTOUT
RFAGC
AGCADJ
AGCFLT
GND1
VIFB
VIFA
GND2
SIF
AFC
VO4.5M
BA7357S
EQFLT
VEQ0
39µH
47p 2k
4.7k
PLLFLT
0.68µ 150
1k
AFT COIL
0.033µ
Vreg
27
PLL COILA
PLL COILB
MODE
X5
AFOUT
IR
18p
18p
22p
1k
24.0k ( + – 1% )
0.01µ
Fig. 1
11

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