AD8375

The AD8375 is a digitally controlled, variable gain wide bandwidth amplifier that provides precise gain control, high IP3 and low noise figure. The excellent distortion performance and high signal bandwidth makes the AD8375 an excellent gain control device for a variety of receiver applications.

For wide input dynamic range applications, the AD8375 pro-vides a broad 24dB gain range with 1 dB resolution. The  ain is adjusted through a 5-pin control interface and can be driven using standard TTL levels. The open-collector outputs  rovide a flexible interface, allowing the overall signal gain to be set by the loading resistance. The AD8375 offers a  aximum trans-conductance gain of 67 m-1's, resulting in a signal gain of 20dB when driving a 150-Ohm load. The maximum signal gain increases to ~24dB when driving a 250-Ohm differential load.Using a high speed SiGe process and incorporating proprietary distortion cancellation techniques, the AD8375 achieves 50 dBm output IP3 at 140 MHz.

The AD8375 is powered on by applying the appropriate logic level to the PWUP pin. The quiescent current of the AD8375 is typically 130mA. When powered down, the AD8375 consumes less than 5mA and offers excellent input to  output isolation. The gain setting is preserved when powered down.

Fabricated on an ADI's high speed SiGe process, the AD8375 provides precise gain adjustment capabilities with good distortion performance. The AD8375 amplifier comes in a compact, thermally enhanced 4 x 4mm 24-lead LFCSP package and operates over the temperature range of −40 to +85.