TSH120 STMICROELECTRONICS | Alldatasheet

Document overview

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Technical content

Features

■ Very low consumption ■ Standby mode available ■ Internal reconstruction filter ■ Internal gain of 6dB ■ Rail-to-rail output ■ Tested with +2.5V and +3.3V single supply ■ Operation supply from +2.2V to +5.5V ■ SAG correction ■ Excellent video performance – Differential gain 0.5% – Differential phase 0.5° – Group delay=10ns ■ Specified for 150Ω load ■ Input DC level shifter ■ Min. and max. limits are tested in full production

Applications

■ Camera phones ■ Digital still camera ■ Digital video camera ■ Set-top box and DVD video outputs

Description

The TSH120 is a video buffer that includes a voltage feedback amplifier with an internal gain of 6dB, rail-to-rail output, internal input biasing and SAG correction. A power down function offers a sleep mode with ultra low consumption. The TSH120 also features an internal reconstruction filter in order to attenuate the parasitic 27MHz frequency from the clock of the video DAC. The TSH120 is a single operator available in a tiny SC70 plastic package for space saving. Pin connections (top view) TSH120 TSH120 OUTSAG IN GND VCC EN (Enable) OUTSAG IN GND VCC EN (Enable)

1 Absolute maximum ratings

Table 1. Absolute maximum ratings

  1. All voltage values are measur ed with respect to the ground pin.
  2. The magnitude of input and output voltage must never exceed V CC +0.3V.
  3. Short-circuits can caus e excessive heating. Destructive dissipation can result from short-circuits on
  4. Human body model: A 100pF capacitor is charged to the specified voltage, then discharged through a

while the other pins are floating.

  1. Machine model: A 200pF capacitor is charged to the specified voltage, then discharged directly between

connected pin combinations while the other pins are floating. This is a minimum value. Table 2. Operating conditions

  1. Tested in full production at +2.5V and +3.3V single supply voltage.

2 Electrical characteristics

Table 3. Electrical characteristics for V CC = +2.5V and +3.3V, Tamb = 25°C (unless otherwise

  1. Guaranteed by design. The parameter is not tested.

3 Implementation in the application

This section explains how the TSH120 video buffer operates in a typical application. gain of the buffer remains 6dB (see Figure 19). Figure 18. Schematic diagram with output capacitor Figure 19. Schematic diagram without output capacitor

5 Shutdown

4 Power supply considerations

Figure 20. Circuit for power supply bypassing Figure 21. Noise supply rejection

5 Package information

Figure 22. SC70-6 (or SOT323-6) package footprint (in millimeters)

Figure 23. SC70-6 (or SOT323-6) package mechanical data

6 Ordering information

7 Revision history

Table 4. Order codes Table 5. Document revision history 29-May-2007 1 Initial version, preliminary data. 20-Jun-2007 2 First complete datasheet. 21-Aug-2007 3 Corrected pinout diagram on cover page (SAG missing).