TSH103 STMICROELECTRONICS | Alldatasheet

Document overview

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Technical content

Features

■ Triple channels ■ Internal 6MHz-reconstruction filter (4th order) ■ 6dB-gain buffer for 75Ω lines ■ 5V single supply ■ Bottom of video signal close to 0V ■ Data min. and max. are physically tested and guaranteed during production

Applications

■ Standard definition TV ■ Set-top box ■ DVD player/recorder

Description

The TSH103 is a low cost video buffer. It is dedicated to drive video signals from any video DACs output on 75Ω video lines in standard definition. With a real benefit in terms of integration and cost saving, this product is particularly efficient for the replacement of current discrete solutions using transistors, coil and capacitors for buffering and filtering. This triple channel is designed to drive either CVBS/Y -C or RGB or YPbPr or YUV formats. Each channel features an internal 6MHz reconstruction filter and a 6dB buffer (attenuation of 27MHz sampling and good output impedance matching with the video line). The TSH103 requires a single 5V power supply. It is available in SO-8 plastic package. OUT2 IN2 OUT1 +Vcc OUT3 IN1 6IN3 GND5 6MHz LPF 6dB 6MHz LPF 6dB 6MHz LPF 6dB+ DC shifter SO-8 plastic package Pin connections

1 Absolute maximum ratings

2 Operating conditions

Table 1. Absolute maximum ratings

  1. All voltage values 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. This range is guaranteed by design (the product is tested in full production at 5V single power supply).

3 Electrical characteristics

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

4 Power supply considerations

CMS 100nF capacitor, also placed as close as possible to the IC pins. Figure 7. Circuit for power supply bypassing Figure 8. Noise supply rejection

5 Using the TSH103 to drive video signals

Figure 9. Video line interface implementation schematics OL) is lower than 46mV (Ta ble 3). Figure 10. Details on Y or G or C VBS for synchronization tip

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

Figure 11. Implementation of the TSH103 (output DC and AC coupling)

  1. Note that the TSH103 is input DC coupling only. It is not AC coupling.

6 Package information

Figure 12. SO-8 package mechanical data

7 Ordering information

8 Revision history

Table 4. Order codes 19-Sep-2007 1 Initial release.