OPA358 datasheet(8/18 Pages) TI2

8 / 18 page

OPA358

SB0S296C − MARCH 2004 − REVISED FEBRUARY 2005

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VIDEO PERFORMANCE

Industry standard video test patterns include:

D Multiburst—packets of different test frequencies to

check for basic frequency response.

D Multipulse—pulses

modulated

different

frequencies to test for comprehensive measurement

of amplitude and group delay errors across the video

baseband.

D Chrominance-to-luminence (CCIR17) — tests ampli-

tude, phase and some distortion

Figure 2 shows the test circuits for Figure 3 through

Figure 13 and Figure 16. (NOTE: 1 and 2 indicate

measurement points corresponding to the waveforms

labeled 1 and 2 in the figures.)

a. Test circuit for Figure 3 through Figure 5.

b. Test circuit for Figure 6.

NOTE: 1 and 2 indicate measurement points

corresponding to the waveforms labeled 1 and

2 in the figures.

500

Ω

500

Ω

500

Ω

500

Ω

Figure 2. Test Circuits Used for Figure 3 through

Figure 6

FREQUENCY RESPONSE OF THE OPA358

Frequency response measurements evaluate the ability of

a video system to uniformly transfer signal components of

different frequencies without affecting their respective

amplitudes. Figure 3 shows the multiburst test pattern;

Figure 4 shows the multipulse. The top waveforms in

these figures show the full test pattern. The middle and

bottom waveform are a more detailed view of the critical

portion of the full waveform. The middle waveform

represents the input signal from the video generator; the

bottom waveform is the OPA358 output to the line.

Figure 3. Multiburst (CCIR 18) Test Pattern (PAL)

Figure 4. Multipulse Test Pattern (PAL)

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