BA7242F View Datasheet(PDF) - ROHM Semiconductor
Part Name
Description
Manufacturer
BA7242F Datasheet PDF : 5 Pages
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Multimedia ICs
•Measurement circuit
BIN input
0.1µ
GIN input
0.1µ
RIN input
0.1µ
VCC
1
CLAMP
BFP
2
CLAMP
BFP
3
CLAMP
BFP
4
Composite SYNC
5
Burst flag pulse
6
(BFP)
7
BA7242F
VCC
14
75
13
220µ
75
75
12
220µ
75
11
YOUT
measurement point
VOUT
measurement point
75
10
0.47µ
75
9
COUT
measurement point
Vcc
0.1µ
8
560
4.7k
Color subcarrier
•Operation description
(1) The composite SYNC is input to the SYNCIN pin.
During Low level input, the SYNC signal is output to
the YOUT, VOUT, and SYNCOUT pins.
(2) The burst flag pulse is input to the BFPIN pin.
During Low level input, the burst signal is output to the
COUT and VOUT pins. For PAL, the phase inversion of
the chroma signal occurs according to this signal.
Furthermore, this signal also acts as the timing for the
pedestal clamp for the RIN, GIN, and BIN pins. By
using an external condenser for charging during Low
level input, the pedestal levels for the RIN, GIN, and
BIN pins are maintained at a uniform level.
(3) The NT / PAL pin is for selecting either NTSC or
PAL. For NTSC, this pin is connected to VCC and for
PAL, this pin is connected to GND.
(4) The SCIN pin is the color subcarrier input pin. Input
either a pulse wave or a sine wave of frequency
3.579545MHz for NTSC or of frequency 4.433619MHz
for PAL.
(5) The COUT pin is the output pin for the chroma sig-
nal, and the YOUT pin is the output pin for the lumi-
nance signal. This is compatible with the S pin because
the chroma signal and the luminance signal can be out-
put separately. Both pins have internal 75Ω drivers.
(6) The VOUT pin is the output pin for a color TV signal
and has an internal 75Ω driver.
4
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