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