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TSH345ID 데이터시트(PDF) 1 Page - STMicroelectronics |
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TSH345ID 데이터시트(HTML) 1 Page - STMicroelectronics |
1 / 14 page 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 ■ 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. 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 www.st.com |
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