DESCRIPTION

The TSH690 is a wide band RF amplifier, designed in advanced bipolar process. At 450 MHz, it features 28dB gain and +13.5dBm (20 mW) output power at 3V. At 900 MHz, it features 23 dB gain and +15.5 dBm (35 mW) output power at 3V.

The pin 8 allows a bias current adjust, setting the RF output level and the amplifier behaviour. It allows using the TSH690 from the linear A-class trough the AB-class to power-down mode.

The TSH690 is suited to drive power amplifiers in cellular phones (GSM, TDMA) for which the ’turn-on time’ is controlled by a voltage ramp. The more than 20 mW output power makes the TSH690 dedicated as output stage for 433MHz and 868 MHz ISM transmitters.

■ Supply voltage: 1.5V to 5V

■ >20 mW adjustable output power

■ 28 dB gain at 450 MHz

■ 21 dB gain at 900 MHz

■ 50 Ω matched input and output

■ Bias pin to adjust the amplification class

■ Power down

APPLICATIONS

■ 433 MHz and 868 MHz ISM transmitters

■ Telemetering systems

■ Remote controls

■ Cordless Telephones

■ Driver for cellular phones

■ Wide band applications