Preliminary Data

This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to

change without notice.

May 2007

Rev 1

1/14

14

TSH345

Triple video buffer with selectable filter

for HD and SD video applications

Features

18 MHz and 9 MHz

Ω loads

production

Applications

Description

The TSH345 is a triple single-supply video buffer

featuring an internal gain of 6 dB and selectable

filtering for HD and SD video outputs on 75

Ω

video lines. The TSH345 is ideal to drive either

Y-C, CVBS, Y-U-V, Y-Pb-Pr or R-G-B signals from

video DAC outputs.

The main advantage of this circuit is its input DC

level shifter. It allows you to drive video signals on

75

Ω video lines without damage to the

synchronization tip, and without either input or

output capacitor while using a single 5 V power

supply. The DC level shifter is internally fixed and

optimized to keep the output video signals

between low and high output rails in the best

position for the greatest linearity.

The TSH345 is available in the SO14 plastic

package for optimum space-saving.

12

G out

1

R2 in

R out

+VCC

2

3

13

14

B out

R1 in

7

G1 in

GND

8

DC Shifter

6dB

6dB

+

36MHz

18MHz

9MHz

LPF

6dB

36MHz

18MHz

9MHz

LPF

36MHz

18MHz

9MHz

LPF

+

+

4

B1 in 5

6

G2 in

B2 in

11

10

9

Fs1

Mux

Fs0

SO14

TSSOP14

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