TSH173 STMICROELECTRONICS | Alldatasheet

Document overview

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  • PDF pages: 13

Technical content

Datasheet sections

  • 1 Absolute maximum ratings
  • 2 Operating conditions
  • 3 Electrical characteristics
  • 3.1 Synchronization tip
  • 3.2 Power supply considerations
  • 4 Using the TSH173 to drive video components
  • 5 Package mechanical data
  • 6 Ordering information
  • 7 Revision history

Features

■ 4.5V to 5.5V single supply operation ■ R-G-B, Y-Pb-Pr, Y-C-CVBS driving ■ 3 channels with 6dB gain buffer ■ 3 video reconstruction filters for SD ■ 3 internal input DC level shifter ■ No input capacitor is required ■ Very low harmonic distortion ■ Each output can drive AC- or DC-coupled 150Ω loads ■ Tested on 5V power supply ■ Data min. and max. are tested during production

Applications

■ Set top boxes ■ DVD players/recorders ■ High-end video systems ■ Standard definition TV (SD) ■ Multimedia products

Description

The TSH173 is a single supply triple video buffer featuring an internal gain of 6dB and an internal low pass filter of 8.2MHz cut-off frequency for each channel to fit with Standard Definition requirements for video line interfaces. Another advantage of the TSH173 is its input DC level shifter to drive the video signal on a 75Ω video line without any damage to the synchronization tip, while using a single 5V power supply with no input capacitor. The DC level shifter is internally fixed and optimized to keep the output video signal between low and high output rails in the best position to improve linearity. This datasheet gives technical information on using the TSH173 as a R-G-B, Y-Pb-Pr, or Y-C- C VBS driver for video DAC outputs on a video line. The TSH173 is available in SO8 plastic package. OUT2 IN2 OUT1 +Vcc OUT3 IN1 GND SO8 DC Shifter 6dB 6dB 8.2MHz 5th order 6dB IN3 8.2MHz 5th order 8.2MHz 5th order Pin connections (top view)

1 Absolute maximum ratings

2 Operating conditions

Table 1. Absolute maximum ratings

  1. All voltage values, except differential voltage, are with respect to network terminal.
  2. An output current limitation protects the circuit from transient currents. Short-circuits can cause excessive

heating. Destructive dissipation can result from short-circuits on amplifiers. Table 2. Operating conditions

  1. Tested in full production at 0V/5V single power supply.

3 Electrical characteristics

Table 3. V CC = +5V single supply, load: RL = 150Ω, Tamb = 25°C (unless otherwise specified)

3.1 Synchronization tip

very low output rail. The DAC offset, as shown in Figure 18, can be as low as 0V. coupled by a capacitor (Figure 20). Figure 18. Input signal Figure 19. DC coupled output configuration Figure 20. AC coupled output configuration

3.2 Power supply considerations

the negative and the positive supply. Figure 21. Circuit for power supply bypassing

4 Using the TSH173 to drive video components

Figure 22. Video line interface implementation schematics

  • Three 75-ohm resistors
  • Three matching resistors
  • One 10µF power supply decoupling capacitor
  • One 10nF power supply decoupling capacitor

Figure 23. Bill of materials of the interface

5 Package mechanical data

Figure 24. SO-8 package

6 Ordering information

7 Revision history

Table 4. Order codes 21-Mar-2007 1 Initial release.