TSH344_07 STMICROELECTRONICS | Alldatasheet
Document overview
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- PDF pages: 17
Technical content
Datasheet sections
- 1 Absolute maximum ratings and operating conditions
- 2 Electrical characteristics
- 3 Application information
- 3.1 Using the TSH344 to drive R-G-B video components
- 3.2 Power supply considerations
- 3.3 Delay between channels
- 4 Package information
- 5 Ordering information
- 6 Revision history
Features
■ Bandwidth: 340MHz ■ 5V single-supply operation ■ Low output rail guaranteed at 60mV max ■ Internal gain of 6dB for a matching between 3 channels ■ Very low harmonic distortion ■ Slew rate: 740V/ms ■ Specified for 150Ω and 100Ω loads ■ Tested on 5V power supply ■ Min. and max. data tested during production
Applications
■ High-end video systems ■ High definition TV (HDTV) ■ Broadcast and graphic video ■ Multimedia products
Description
The TSH344 is a triple single-supply video buffer featuring an internal gain of 6dB and a large bandwidth of 340MHz. The main advantage of this buffer is its very low output rail very close to GND when supplied in single supply 0/5V. This output rail is guaranteed by test at 60mV from GND on 150Ω. This datasheet gives technical information on using the TSH344 as an RGB driver for video DAC output on a video line. See the TSH343 datasheet for Y -Pb-Pr signals. The TSH344 is available in the compact SO8 plastic package for optimum space-saving. Top View OUT2 IN2 OUT1 +Vcc OUT3 IN1 6IN3 GND SO8 Pin1 identification 6dB 6dB 6dB Pin connections (top view)
1 Absolute maximum ratings and operating conditions
Table 1. Absolute maximum ratings (AMR)
- All voltage values, except differential volt age, are with respect to network terminal.
- The magnitude of input and output voltage must never exceed V CC +0.3V.
Table 2. Operating conditions
- Tested in full production at 0V/5V single power supply.
2 Electrical characteristics
Table 3. V CC = +5V single supply, Tamb = 25°C (unless otherwise specified)
- Output offset voltage is determi ned by the following expression: VOUT =G.VIN+VOS.
- See Figure 28 and Figure 29.
- Non-tested value, guaranteed by design and evaluation. See Figure 12.
3 Application information
3.1 Using the TSH344 to dr ive R-G-B video components
Figure 25. Shapes of video signals coming from DACs Figure 26. TSH344 in single supply for HD video signal including a synchronization tip).
- Fclock=74.25MHz t=1/Fclock=13.5ns Synchronization tip (0 IRE) White (100 IRE) 0.030V 0.330V 1.030V 700mV time Frequency Amplitude 30MHz 1Vp-p Pb,B video outputs LPF LPF LPF Cable Cable Cable +5V 75Ω 75Ω 75Ω TSH344 SO8 Y,G(+synchro) DAC DAC DAC Pr,R G video outputs LPF LPF LPF Cable Cable Cable +5V 75Ω 75Ω 75Ω TSH343 SO8 R DAC DAC DAC B HDTV Digital synchro
Figure 27. Details on one channel of the TSH344 implement an output series capacitor).
3.2 Power supply considerations
Figure 28. Circuit for power supply bypassing on how carefully the power supply decoupling is achieved. Figure 29. Improvement of power supply noise rejection
3.3 Delay between channels
Figure 30. Measurement of the delay between each channel delay between the inputs and the outputs is equal to 4ns. Figure 31. Relative delay between each channel
4 Package information
In order to meet environmental requirements, STMicroelectronics offers these devices in ECOPACK® packages. These packages have a lead-free second level interconnect. The category of second level interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an STMicroelectronics trademark. ECOPACK specifications are available at: www.st.com
Figure 32. SO-8 package mechanical data
5 Ordering information
6 Revision history
Table 4. Order codes Dec-2005 1 First release of datasheet. Jan-2006 2 Capa-load option paragraph deleted on page 11. Jul-2006 3 Application information. 14-Mar-2007 4 Updated Section 3.2: Power supply considerations on page 12.