TSH345 Datasheet, PDF (1/14 Pages) STMicroelectronics – Triple video buffer with selectable filter for HD and SD video applications

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.
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