AD720 View Datasheet(PDF) - Analog Devices
Part Name
Description
Manufacturer
AD720 Datasheet PDF : 8 Pages
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AD720/AD721
ABSOLUTE MAXIMUM RATINGS*
Supply Voltage ± VS . . . . . . . . . . . . . . . . . . . . . . . . . . . . .± 6 V
Internal Power Dissipation . . . . . . . . . . . . . . . . . . . . . . 600 mW
Operating Temperature Range . . . . . . . . . . . . . . 0°C to +70°C
Storage Temperature Range . . . . . . . . . . . . –65°C to +150°C
Lead Temperature, Soldering 60 sec . . . . . . . . . . . . . . +300°C
NOTE
*Stresses above those listed under “Absolute Maximum Ratings” may cause
permanent damage to the device. This is a stress rating only, and functional
operation of the device at these or any other conditions above those indicated in the
operational section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended rating conditions for extended periods
may affect device reliability.
Thermal characteristics: 28-pin plastic package: θJA = 100°C.
Model
AD720JP
AD721JP
ORDERING GUIDE
Temperature
Range
Package
0°C to +70°C
0°C to +70°C
28-Pin PLCC
28-Pin PLCC
Package
Option
P-28A
P-28A
PIN CONNECTIONS
28-Lead Plastic Leaded Chip Carrier (PLCC) Package
P-28A
4 3 2 1 28 27 26
ENCD 5
RDIN 6
AGND 7
GRIN 8
AGND 9
BLIN 10
STND 11
AD720/AD721
RGB TO NTSC/PAL
ENCODER
25 DGND
24 SYNC
23 DPOS
22 ASNC
21 DPOS
20 4FSC
19 DGND
12 13 14 15 16 17 18
NOTE:
CONNECTIONS IN ( ) PERTAIN ONLY TO AD720
PIN DESCRIPTIONS
Pin Mnemonic* Description*
1 (NC) GOUT (No Connection) Green Bypass Buffer
2 (NC) APOS (No Connection) Analog Positive Supply; +5 V ± 5%
3 (NC) ROUT (No Connection) Red Bypass Buffer
4 AGND
Analog Ground Connection
5 ENCD
A Logical High Enables the NTSC/PAL Encode
Mode (A Logical Low Powers Down the Chip)
A Logical Low Enables the RGB Bypass Mode
6 RDIN
Red Component Video Input
0 mV to 714 mV for NTSC
0 mV to 700 mV for PAL
7 AGND
Analog Ground Connection
8 GRIN
Green Component Video Input
0 mV to 714 mV for NTSC
0 mV to 700 mV for PAL
9 AGND
Analog Ground Connection
10 BLIN
Blue Component Video Input
0 mV to 714 mV for NTSC
0 mV to 700 mV for PAL
11 STND
A Logical High Input Selects NTSC Encoding
A Logical Low Input Selects PAL Encoding
CMOS Logic Levels
12 AGND
Analog Ground Connection
13 CRMA
Chrominance Output; Subcarrier Only**
572 mV Peak-to-Peak for NTSC
600 mV Peak-to-Peak for PAL
14 APOS
Analog Positive Supply; +5 V ± 5%
15 CMPS
Composite Video Output**
–572 mV to 2 V for NTSC
–600 mV to 2 V for PAL
16 APOS
Analog Positive Supply; +5 V ± 5%
17 LUMA
Luminance Plus SYNC Output**
–572 mV to 1.43 V for NTSC
–600 mV to 1.4 V for PAL
18 VNEG
System Negative Supply; –5 V ± 5%
19 DGND
Digital Ground Connection
20 4FSC
Clock Input at Four Times the Subcarrier Frequency
14.318 180 MHz for NTSC
17.734 480 MHz for PAL
CMOS Logic Levels
21 DPOS
Digital Positive Supply; +5 V ± 5%
22 ASNC
A Logical High Input Resets the Subcarrier Phase
Every Frame
A Logical Low Input Resets the Subcarrier Phase
Every Fourth Frame
CMOS Logic Levels
23 DPOS
Digital Positive Supply; +5 V ± 5%
24 SYNC
Input for Composite Television
Synchronization Pulses
Negative Sync Pulses
CMOS Logic Levels
25 DGND
Digital Ground Connections (One of Two)
26 VNEG
System Negative Supply; –5 V ± 5%
27 (NC) BOUT (No Connection) Blue Bypass Buffer
28 APOS
Analog Positive Supply; +5 V ± 5%
*( ) pertain only to AD720.
**The luminance, chrominance, and composite outputs are at twice normal
levels for driving 75 Ω reverse-terminated lines.
CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection.
Although the AD720/AD721 features proprietary ESD protection circuitry, permanent damage
may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD
precautions are recommended to avoid performance degradation or loss of functionality.
WARNING!
ESD SENSITIVE DEVICE
REV. 0
–3–
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