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 SO-8 (plastic package) Three matched 6 dB amplifiers AC or DC output-coupled Pin1 identification Very low harmonic distortion Top View Specified for 150 loads 36MHz Minimum and maximum data is tested during 8 R out R in 1 6dB ++ LPF production 36MHz G in 2 7 G out 6dB ++ Applications LPF High-end video systems 36MHz B in 3 6dB 6 B out ++ LPF High definition TV (HDTV) Broadcast and graphic video +VCC 4 DC Shifter 5 GND 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- 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- 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. December 2008 Rev 2 1/18 www.st.com 18Absolute maximum ratings and operating conditions TSH346 1 Absolute maximum ratings and operating conditions Table 1. Absolute maximum ratings (AMR) Symbol Parameter Value Unit (1) V Supply voltage 6V CC (2) V Input voltage range 2.5 V in T Operating free air temperature range -40 to +85 C oper T Storage temperature -65 to +150 C std T Maximum junction temperature 150 C j R SO8 thermal resistance junction to case 28 C/W thjc R SO8 thermal resistance junction to ambient area 150 C/W thja P Maximum power dissipation (at T =25 C) for T = 150 C 1 W max. amb j CDM: charged device model 500 V ESD HBM: human body model 2 kV MM: machine model 100 V 1. All voltage values, except the differential voltage, are with respect to the network terminal. 2. The magnitude of the input and output voltages must never exceed V +0.3 V. CC Table 2. Operating conditions Symbol Parameter Value Unit (1) V Power supply voltage 4.5 to 5.5 V CC 1. Tested in full production with a +5 V single power supply. 2/18