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AD722 Datasheet(PDF) 2 Page - Analog Devices

Part No. AD722
Description  RGB to NTSC/PAL Encoder
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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AD722–SPECIFICATIONS
REV. 0
–2–
(Unless otherwise noted, VS = +5, TA = +25
°C, using FSC synchronous clock. All loads are
150
Ω ± 5% at the IC pins. Outputs are measured at the 75 Ω reverse terminated load.)
Parameter
Conditions
Min
Typ
Max
Units
SIGNAL INPUTS (RDIN, GRIN, BLIN)
Input Amplitude
NTSC
714
mV p-p
PAL
700
mV p-p
Black Level
03
V
Input Resistance
1
Red, Green, Blue
1
M
Input Capacitance
5pF
LOGIC INPUTS (SYNC, FSC, ENCD, NTSC)
CMOS Logic Levels
Logic LO Input Voltage
1V
Logic HI Input Voltage
4
V
Logic LO Input Current (DC)
<1
µA
Logic HI Input Current (DC)
<1
µA
VIDEO OUTPUTS
2
Luminance (LUMA)
Roll-off @ 5 MHz
NTSC
–10
dB
PAL
–7
dB
Gain Error
–15
–5
+15
%
Linearity
±0.6
%
Sync Level
NTSC
243
286
329
mV
PAL
300
mV
DC Black Level
1.3
V
Chrominance (CRMA)
Bandwidth
NTSC
3.6
MHz
PAL
4.4
MHz
Color Burst Amplitude
NTSC
170
240
330
mV p-p
PAL
252
mV
Color Signal to Burst Ratio Error
–15
±315
%
Color Burst Width
NTSC
2.51
µs
PAL
2.28
µs
Phase Error
3
±3
Degrees
DC Black Level
2.1
V
Chroma Feedthrough
R, G, B = 0
10
40
mV p-p
Chroma/Luma Time Alignment
–140
ns
Composite (COMP)
Absolute Gain Error
–5
±15
%
Differential Gain
With Respect to Chroma
0.5
%
Differential Phase
With Respect to Chroma
2.0
%
DC Black Level
1.6
V
POWER SUPPLIES
Recommended Supply Range
Single Supply
+4.75
+5.25
V
Quiescent Current—Encode Mode
30
40
mA
Quiescent Current—Power Down
1
mA
NOTES
1R, G, and B signals are inputted to an on-chip AC coupling capacitor.
2All outputs measured at a 75
Ω reverse-terminated load; voltages at the IC output pins are twice those specified here.
3Difference between ideal color-bar phases and the actual values.
Specifications are subject to change without notice.




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