TSH345(2007) View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

TSH345
(Rev.:2007)

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

STMicroelectronics 

TSH345

Triple video buffer with selectable filter

for HD and SD video applications

Preliminary Data

Features

■ Selectable 6th order filtering of 36 MHz,

18 MHz and 9 MHz

■ 5 V single-supply operation

■ Internal input DC level shifter

■ No input capacitor required

■ 3 matched 6 dB amplifiers

■ AC or DC output-coupled

■ Very low harmonic distortion

■ Specified for 150 Ω loads

■ Data min. and max. are tested during

production

Applications

■ High-end video systems

■ High definition TV (HDTV)

■ Broadcast and graphic video

■ Multimedia products

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.

SO14

TSSOP14

R1 in 1

R2 in 2

G1 in 3

G2 in 4

B1 in 5

B2 in 6

+VCC 7

36MHz

18MHz

9MHz

LPF

+ 6dB

14 Fs0

13 Fs1

36MHz

18MHz

9MHz

LPF

+ 6dB

12 R out

11 G out

36MHz

18MHz

9MHz

LPF

+ 6dB

DC Shifter

10 B out

9 Mux

8 GND

The TSH345 is available in the SO14 plastic

package for optimum space-saving.

May 2007

Rev 1

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

change without notice.

1/14

www.st.com

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