TSH345IDT(2007) 查看數據表（PDF） - STMicroelectronics

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TSH345IDT
(Rev.:2007)

Triple video buffer with selectable filter for HD and SD video applications

STMicroelectronics 

TSH345

Using the TSH345 to drive Y-C, CVBS, Y-U-V, Y-Pb-Pr and R-G-B video components

4

Using the TSH345 to drive Y-C, CVBS, Y-U-V, Y-Pb-Pr

and R-G-B video components

Figure 2. Implementation of the video driver on output video DACs

Y

Video

DAC

1Vpp

Reconstruction

Filtering

LPF +

+5V

+6dB

75Ω

2Vpp

Pb

Video

DAC

Reconstruction

Filtering

LPF +

0.7Vpp

+6dB

75Ω

1.4Vpp

Video

DAC

Pr

Reconstruction

Filtering

LPF + +6dB

0.7Vpp

TSH345

-5V GND

75Ω

1.4Vpp

75Ω Cable

75Ω Cable

75Ω Cable

1Vpp

TV

75Ω

0.7Vpp

75Ω

0.7Vpp

75Ω

Figure 3. Shapes of video signals coming from DACs (example for a black picture)

HD

27ns

(2t)

54ns 27ns

(4t) (2t)

590ns

(44t)

300mV

•Fclock=74.25MHz

•t=1/Fclock=13.5ns

Black (30IRE)

300mV

GND

590ns

(44t)

14.8us (1100t): 1920/1080i

24.3us (1800t): 1280/720i

sync.tip

SD

160ns 150ns

300mV

GND

4.6us

sync.tip

64us

Black (30IRE)

7/14

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