AD722 View Datasheet(PDF) - Analog Devices

Part Name

Description

Manufacturer

AD722

RGB to NTSC/PAL Encoder

Analog Devices 

AD722–SPECIFICATIONS (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

SIGNAL INPUTS (RDIN, GRIN, BLIN)

Input Amplitude

Black Level

Input Resistance1

Input Capacitance

LOGIC INPUTS (SYNC, FSC, ENCD, NTSC)

Logic LO Input Voltage

Logic HI Input Voltage

Logic LO Input Current (DC)

Logic HI Input Current (DC)

VIDEO OUTPUTS2

Luminance (LUMA)

Roll-off @ 5 MHz

Gain Error

Linearity

Sync Level

DC Black Level

Conditions

NTSC

PAL

Red, Green, Blue

CMOS Logic Levels

NTSC

PAL

NTSC

PAL

Min Typ Max

714

700

0

3

1

5

1

4

<1

<1

–10

–7

–15 –5

+15

± 0.6

243 286 329

300

1.3

Chrominance (CRMA)

Bandwidth

Color Burst Amplitude

Color Signal to Burst Ratio Error

Color Burst Width

Phase Error3

DC Black Level

NTSC

PAL

NTSC

PAL

NTSC

PAL

3.6

4.4

170 240 330

252

–15 ± 3

15

2.51

2.28

±3

2.1

Chroma Feedthrough

Chroma/Luma Time Alignment

R, G, B = 0

10

40

–140

Composite (COMP)

Absolute Gain Error

Differential Gain

Differential Phase

DC Black Level

With Respect to Chroma

With Respect to Chroma

–5

±1

0.5

2.0

1.6

POWER SUPPLIES

Recommended Supply Range

Quiescent Current—Encode Mode

Quiescent Current—Power Down

Single Supply

+4.75

30

1

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.

5

+5.25

40

Units

mV p-p

mV p-p

V

MΩ

pF

V

V

µA

µA

dB

dB

%

%

mV

mV

V

MHz

MHz

mV p-p

mV

%

µs

µs

Degrees

V

mV p-p

ns

%

%

%

V

V

mA

mA

–2–

REV. 0

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