Using the TSH343 to Drive Y-Pb-Pr Video Components

TSH343

10/14

Rev. 2

4

Using the TSH343 to Drive Y-Pb-Pr Video

Components

Figure 27. Shapes of video signals coming from DACs

Figure 28. Implementation of the video driver on output video DACs

0 IRE

Black Level

Image Content

30 IRE

White Level

100 IRE

1Vp-p

300mV

GND

Video

DAC

Image Content

Y

Pb

Pr

Video

DAC

R

G

B

Y signal

(synchronization tip)

R,G,B,Pb,Pr signals

(no synchronization tip)

+5V

75

Ω

75

Ω Cable

75

Ω

1Vpp

1Vpp

2Vpp

1Vpp

1Vpp

Video

DAC

LPF

Reconstruction

Filtering

Y

75

Ω

75

Ω Cable

75

Ω

Video

DAC

Pb

75

Ω

Video

DAC

Pr

TV

600mV

TSH343

75

Ω Cable

75

Ω

+6dB

+

+

LPF

Reconstruction

Filtering

+6dB

+

+

LPF

Reconstruction

Filtering

+6dB

+

+

20mV

1Vp-p

Content of the

video signal+ tip synchro.

0V

620mV

1Vp-p

0V

620mV

1Vp-p

0V

(1) DAC output

(2) Amplifier input

(3) Amplifier output

(4) On the line

+600mV

0.7Vpp

0.7Vpp

1.4Vpp

1.4Vpp

0.7Vpp

0.7Vpp

0.7Vpp

0.7Vpp

1.4Vpp

1.4Vpp

0.7Vpp

0.7Vpp

600mV

600mV

-5V

GND

1,24V

2Vp-p

0V

Amplifier output rail

(70mV max.)

Amplifier output rail

(3.7V min.)

3,24V