AD720/AD721
ABSO LUTE MAXIMUM RATINGS*
P IN D ESCRIP TIO NS
Supply Voltage ±VS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±6 V
Internal Power Dissipation . . . . . . . . . . . . . . . . . . . . . . 600 mW
Operating T emperature Range . . . . . . . . . . . . . . 0°C to +70°C
Storage T emperature Range . . . . . . . . . . . . –65°C to +150°C
Lead T emperature, Soldering 60 sec . . . . . . . . . . . . . . +300°C
NOT E
*Stresses above those listed under “Absolute Maximum Ratings” may cause
permanent damage to the device. T his 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.
P in Mnem onic* D escription*
1
2
3
4
5
(NC) GOUT (No Connection) Green Bypass Buffer
(NC) APOS
(NC) ROUT
AGND
(No Connection) Analog Positive Supply; +5 V ± 5%
(No Connection) Red Bypass Buffer
Analog Ground Connection
ENCD
A Logical High Enables the NT SC/PAL Encode
Mode (A Logical Low Powers Down the Chip)
A Logical Low Enables the RGB Bypass Mode
Red Component Video Input
0 mV to 714 mV for NT SC
6
RDIN
0 mV to 700 mV for PAL
T hermal characteristics: 28-pin plastic package: θJA = 100°C.
7
8
AGND
GRIN
Analog Ground Connection
Green Component Video Input
0 mV to 714 mV for NT SC
O RD ERING GUID E
0 mV to 700 mV for PAL
9
AGND
Analog Ground Connection
Blue Component Video Input
0 mV to 714 mV for NT SC
Tem perature
Range
P ackage
O ption
10 BLIN
Model
P ackage
0 mV to 700 mV for PAL
AD720JP
AD721JP
0°C to +70°C
0°C to +70°C
28-Pin PLCC
28-Pin PLCC
P-28A
P-28A
11 ST ND
A Logical High Input Selects NT SC Encoding
A Logical Low Input Selects PAL Encoding
CMOS Logic Levels
12 AGND
13 CRMA
Analog Ground Connection
P IN CO NNECTIO NS
28-Lead P lastic Leaded Chip Car r ier (P LCC) P ackage
P -28A
Chrominance Output; Subcarrier Only**
572 mV Peak-to-Peak for NT SC
600 mV Peak-to-Peak for PAL
Analog Positive Supply; +5 V ± 5%
Composite Video Output**
14 APOS
15 CMPS
–572 mV to 2 V for NT SC
–600 mV to 2 V for PAL
16 APOS
17 LUMA
Analog Positive Supply; +5 V ± 5%
Luminance Plus SYNC Output**
–572 mV to 1.43 V for NT SC
–600 mV to 1.4 V for PAL
System Negative Supply; –5 V ± 5%
Digital Ground Connection
Clock Input at Four T imes the Subcarrier Frequency
14.318 180 MHz for NT SC
17.734 480 MHz for PAL
1
26
4
3
2
28 27
5
6
25
24
23
22
21
20
19
DGND
SYNC
DPOS
ASNC
DPOS
4FSC
ENCD
RDIN
18 VNEG
19 DGND
20 4FSC
7
AGND
GRIN
AGND
BLIN
AD720/AD721
RGB TO NTSC/PAL
ENCODER
8
CMOS Logic Levels
9
21 DPOS
22 ASNC
Digital Positive Supply; +5 V ± 5%
A Logical High Input Resets the Subcarrier Phase
Every Frame
10
STND 11
DGND
A Logical Low Input Resets the Subcarrier Phase
Every Fourth Frame
CMOS Logic Levels
12
13 14 15 16 17 18
23 DPOS
24 SYNC
Digital Positive Supply; +5 V ± 5%
Input for Composite T elevision
Synchronization Pulses
NOTE:
CONNECTIONS IN ( ) PERTAIN ONLY TO AD720
Negative Sync Pulses
CMOS Logic Levels
25 DGND
26 VNEG
27 (NC) BOUT
28 APOS
Digital Ground Connections (One of T wo)
System Negative Supply; –5 V ± 5%
(No Connection) Blue Bypass Buffer
Analog Positive Supply; +5 V ± 5%
*( ) pertain only to AD720.
**T he luminance, chrominance, and composite outputs are at twice normal
levels for driving 75 Ω reverse-terminated lines.
CAUTIO N
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. T herefore, proper ESD
precautions are recommended to avoid performance degradation or loss of functionality.
WARNING!
ESD SENSITIVE DEVICE
REV. 0
–3–
5秒后页面跳转
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