Electrical characteristics

TSH173

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3.1

Synchronization tip

The TSH173, in single 0/5V supply, is designed to drive the video signal on the line without

any damage to the synchronization tip. This is achieved by a small internal DC shift and a

very low output rail. The DAC offset, as shown in Figure 18, can be as low as 0V.

Nevertheless, in order to minimize the DC component on the line, the output can be AC

coupled by a capacitor (Figure 20).

Figure 18.

Input signal

Figure 19.

DC coupled output configuration

Figure 20.

AC coupled output configuration

DAC offset

GND

4.6µs

160ns

300mV

Black (30 IRE)

64µs

150ns

Synchronization tip

(0 IRE)

75

Ω

75

Ω Cable

75

Ω

Video

DAC

TSH173

V

out

V

in

75

Ω

75

Ω Cable

75

Ω

Video

DAC

220µF

V

in

V

out

TSH173