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AD724 Arkusz danych(PDF) 4 Page - Analog Devices

Numer części AD724
Szczegółowy opis  RGB to NTSC/PAL Encoder
Download  15 Pages
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Producent  AD [Analog Devices]
Strona internetowa  http://www.analog.com
Logo AD - Analog Devices

AD724 Arkusz danych(HTML) 4 Page - Analog Devices

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REV. B
–4–
AD724
PIN FUNCTION DESCRIPTIONS
Pin
Mnemonic
Description
Equivalent Circuit
1
STND
A Logical HIGH input selects NTSC encoding.
Circuit A
A Logical LOW input selects PAL encoding.
CMOS/TTL Logic Levels.
2
AGND
Analog Ground Connection.
3
FIN
FSC clock or parallel-resonant crystal, or 4FSC clock input.
Circuit B
For NTSC: 3.579 545 MHz or 14.318 180 MHz.
For PAL: 4.433 619 MHz or 17.734 480 MHz.
CMOS/TTL Logic Levels for subcarrier clocks.
4
APOS
Analog Positive Supply (+5 V
± 5%).
5
ENCD
A Logical HIGH input enables the encode function.
Circuit A
A Logical LOW input powers down chip when not in use.
CMOS/TTL Logic Levels.
6
RIN
Red Component Video Input.
Circuit C
0 to 714 mV AC-Coupled.
7
GIN
Green Component Video Input.
Circuit C
0 to 714 mV AC-Coupled.
8
BIN
Blue Component Video Input.
Circuit C
0 to 714 mV AC-Coupled.
9
CRMA
Chrominance Output.*
Circuit D
Approximately 1.8 V peak-to-peak for both NTSC and PAL.
10
COMP
Composite Video Output.*
Circuit D
Approximately 2.5 V peak-to-peak for both NTSC and PAL.
11
LUMA
Luminance plus SYNC Output.*
Circuit D
Approximately 2 V peak-to-peak for both NTSC and PAL.
12
SELECT
A Logical LOW input selects the FSC operating mode.
Circuit A
A Logical HIGH input selects the 4FSC operating mode.
CMOS/TTL Logic Levels.
13
DGND
Digital Ground Connections.
14
DPOS
Digital Positive Supply (+5 V
± 5%).
15
VSYNC
Vertical Sync Signal (if using external CSYNC set at > +2 V). CMOS/TTL Logic Levels.
Circuit A
16
HSYNC
Horizontal Sync Signal (or CSYNC signal). CMOS/TTL Logic Levels.
Circuit A
*The Luminance, Chrominance and Composite Outputs are at twice normal levels for driving 75
Ω reverse-terminated lines.
5
1
12
15
16
DPOS
DGND
3
VBIAS
DPOS
DGND
7
VCLAMP
6
8
DPOS
DGND
10
9
11
APOS
AGND
DGND
DPOS
Circuit B
Circuit D
Equivalent Circuits
Circuit A
Circuit C


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