December 2008 Rev 2 1/18
18
TSH346
Triple video buffer/filter for HD video applications
Features
■ 6th order filtering of 36 MHz
■ 5 V single-supply operation
■ Internal input DC level shifter
■ No input capacitor required
■ Three matched 6 dB amplifiers
■ AC or DC output-coupled
■ Very low harmonic distortion
■ Specified for 150 Ω loads
■ Minimum and maximum data is tested during
production
Applications
■ High-end video systems
■ High definition TV (HDTV)
■ Broadcast and graphic video
■ Multimedia products
Description
The TSH346 is a triple single-supply video buffer
featuring an internal gain of 6 dB and a 36 MHz
filtering for HD video outputs on 75-Ω video lines.
The TSH346 is ideal to drive either YUV, YPbPr or
RGB signals from video DAC outputs. The main
advantage of this circuit is that its input DC level
shifter allows for video signals on 75-Ω video lines
without damaging the synchronization tip of the
video signal, and with no input 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. This level is as low as possible to minimize
the output DC level in the video line.
The TSH346 is available in an SO-8 plastic
package for optimum space saving.
Top View
1
R out
2
3
7
8
G out
R in
6
G in
+VCC
Pin1 identification
DC Shifter
6dB
6dB
6dB
36MHz
LPF
+
+
+
+
+
+
4
B in
5
B out
GND
36MHz
LPF
36MHz
LPF
SO-8
(plastic package)
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