TSH341 Ver la hoja de datos (PDF) - STMicroelectronics

Número de pieza

componentes Descripción

Fabricante

TSH341

300MHz Single Supply Video Amplifier with Low In/Out Rail

STMicroelectronics 

TSH341

Using the TSH341 to Drive Video Signals

5 Using the TSH341 to Drive Video Signals

Figure 25. Implementation of the video driver on output video DACs

Video

DAC

Volt

Reconstruction

Filtering

LPF

1Vpp

+5V

+

_

Rg Rfb

Video

Signal

2.250V

250mV

time

Volt

Video

Signal

1.125V

125mV

time

75Ω 75Ω Cable

1Vpp

75Ω

2Vpp

VOL(50MHz) = 150mV (Figure 8)

To drive the video signal properly, the output of the driver must be at least equal to

250mV (assuming Vio and VOL variations).

z 1st solution:

Set the video DAC 0-IRE output level to 125mV.

100 IRE

White Level

Black Level 30 IRE

0 IRE

Image Content

300mV

150mV

0V

Synchronization Tip

1Vp-p

z 2nd solution:

Implementation of a DC component in the input of the driver.

Volt

Video

DAC

33uF

Reconstruction

Filtering

LPF

1Vpp

1k

+5V

+

_

DC component

=125mV

Rg Rfb

Video

Signal

2.250V

Volt

250mV

time

Video

Signal

1.125V

125mV

time

75Ω 75Ω Cable

1Vpp

75Ω

2Vpp

10/13

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