General Description

The MAX2685’s low-noise amplifier (LNA) and downconverter mixer comprise the major blocks of an RF front-end receiver. Optimized for 900MHz operation, the device’s low noise figure, high gain, and high linearity make it ideal for cellular, cordless, and wireless data applications. A low supply current of 8.5mA (high-gain mode) and 3.8mA (low-gain mode) plus a low operating supply voltage range of +2.7V to +5.5V make it suitable for use in 3-cell NiCd or 1-cell lithium-ion (Li+) battery applications. A low-power shutdown mode further extends battery life by reducing supply current below 0.1µA.

Features

♦ 800MHz to 1000MHz RF Frequency Range

♦ +2.7V to +5.5V Single-Supply Operation

♦ Integrated LNA + Mixer + LO Buffer

♦ Logic-Controlled LNA Bypass Switch Reduces Supply Current

♦ LNA Performance (High/Low Gain)

Gain: +15dB/-12dB

NF: 1.4dB/12dB

Input IP3: -4dBm/+16dBm

♦ Mixer Performance (High/Low Gain)

Gain: 6dB/4.6dB

NF: 13dB/12dB

Input IP3: +7dBm/-1.5dBm

♦ Supply Current

8.5mA (High Gain)

3.8mA (Low Gain)

♦ <0.1µA Supply Current in Shutdown Mode

♦ 0.8µs Receiver Enable Time

Applications

Cellular/Cordless Phones

900MHz ISM-Band Radios

Wireless Data

868MHz European ISM Band