TSH344 Просмотр технического описания (PDF) - STMicroelectronics

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производитель

TSH344

340MHz single-supply triple video buffer

STMicroelectronics 

Application information

3

Application information

TSH344

3.1

Using the TSH344 to drive R-G-B video components

Figure 25. Shapes of video signals coming from DACs

White (100 IRE)

1.030V

27ns

(2t)

54ns 27ns

(4t) (2t)

590ns

(44t)

300mV 700mV

Black (30 IRE)

0.330V

300mV

10mV

GND

590ns

(44t)

Synchronization tip

14.8µs (1100t): 1920*1080i

24.3µs (1800t): 1280*720i

(0 IRE) 0.030V

time

•Fclock=74.25MHz

•t=1/Fclock=13.5ns

Amplitude

1Vp-p

30MHz

Frequency

Figure 26. TSH344 in single supply for HD

video

outputs

R

DAC

G

DAC

B

DAC

+5V

75Ω

TSH344 75Ω

SO8

75Ω

LPF

LPF

LPF

Digital synchro

video

outputs

+5V

Y,G(+synchro)

75Ω

DAC

Pb,B

DAC

Pr,R

DAC

TSH343 75Ω

SO8

75Ω

LPF

LPF

LPF

Cable

Cable

Cable

Cable

Cable

Cable

HDTV

Note:

See the TSH343 datasheet on st.com for more information (the TSH343 is used to drive a

video signal including a synchronization tip).

10/17

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