75

Ω

75

Ω

TEKTRONIX TSG 300

COMPONENT VIDEO

WAVEFORM GENERATOR

AD720/AD721

RGB TO NTSC/PAL

ENCODER

SONY

MONITOR

MODEL 1342

TEKTRONIX 1910

COMPOSITE VIDEO

WAVEFORM GENERATOR

GENLOCK

RGB

3

COMPOSITE

SYNC

FSC

4FSC

PIXEL-CLOCK

GENERATOR

COMPOSITE VIDEO

TEKTRONIX VM700A

WAVEFORM MONITOR

Figure 1. AD720/AD721 Evaluation Setup

0.10

0.05

0.00

–0.05

–0.10

0.00

–0.04

0.00

–0.01

–0.04

–0.10

0.10

0.05

0.00

–0.05

–0.10

0.00

0.05

0.05

0.04

0.07

0.01

1ST

2ND

3RD

4TH

5TH

6TH

DG DP(NTSC) (SYNC = EXT)

FIELD = 1 LINE = 21

DIFFERENTIAL GAIN (%) MIN = –0.10; MAX = 0.00; p-p/MAX = 0.10

DIFFERENTIAL PHASE (

°) MIN = 0.00; MAX = 0.07; p-p = 0.07

Figure 2. Composite Output Differential Phase and Gain,

NTSC (Nulled to Chroma Output)

100.0

0.0

0.0

50.0

70.0

60.0

50.0

40.0

30.0

20.0

10.0

0.5

NOISE REDUCTION: 15.05dB

APL = 49.6%

525 LINE NTSC; NO FILTERING

SLOW CLAMP TO 0.00V AT 6.63

µs

SYNC = SOURCE

FRAMES SELECTED: 1 2

MICROSECONDS/PRECISION MODE OFF

VOLTS

IRE:FLT

Figure 3. Modulated Pulse and Bar, NTSC

0.0

70.0

60.0

50.0

40.0

30.0

20.0

10.0

MICROSECONDS

FRAMES SELECTED: 1 2; APL = 45.8%

525 LINE NTSC; NO FILTERING

SLOW CLAMP TO 0.00V AT 6.63

µs

PRECISION MODE OFF

SYNC = SOURCE

100.0

0.0

0.0

50.0

70.0

60.0

50.0

40.0

30.0

20.0

10.0

0.5

VOLTS

IRE:FLT

Figure 4. 100% Color Bars, NTSC

0.0

70.0

60.0

50.0

40.0

30.0

20.0

10.0

MICROSECONDS

FRAMES SELECTED: 1 2; APL = 11.3%

525 LINE NTSC; NO FILTERING

SLOW CLAMP TO 0.00V AT 6.63

µs

PRECISION MODE OFF

SYNC = SOURCE

100.0

0.0

0.0

50.0

70.0

60.0

50.0

40.0

30.0

20.0

10.0

0.5

VOLTS

IRE:FLT

Figure 5. Multipulse, NTSC

5.35

µs

4.82

µs

8.0

CYCLES

39.4 IRE

85ns

73ns

H TIMING MEASUREMENT RS-170A (NTSC)

FIELD = 1 LINE = 22

39.2 IRE

AVERAGE 32 TO 32

Figure 6. Horizontal Timing, NTSC

4.82

µs

1.98

µs

292.1mV

81ns

AVERAGE 32 TO 32

302.2mV

H TIMING (PAL)

LINE = 17

82ns

5.52

µs

Figure 7. Horizontal Timing, PAL

AD720/AD721–Typical Characteristics

–4–

REV. 0