MAX2685

19-1493; Rev 0; 7/99 L MANUA ION KIT HEET T A U L EVA TA S WS DA FOLLO Low-Cost, 900MHz, Low-Noise Amplifier and Downconverter Mixer General Description Features o 800MHz to 1000MHz RF Frequency Range o +2.7V to +5.5V Single-Supply Operation o Integrated LNA + Mixer + LO Buffer o Logic-Controlled LNA Bypass Switch Reduces Supply Current o LNA Performance (High/Low Gain) Gain: +15dB/-12dB NF: 1.4dB/12dB Input IP3: -4dBm/+16dBm o Mixer Performance (High/Low Gain) Gain: 6dB/4.6dB NF: 13dB/12dB Input IP3: +7dBm/-1.5dBm o Supply Current 8.5mA (High Gain) 3.8mA (Low Gain) o <0.1µA Supply Current in Shutdown Mode o 0.8µs Receiver Enable Time MAX2685 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. The MAX2685 includes an LNA, LNA bypass switch, downconverter mixer, and local-oscillator (LO) buffer. The LNA has a low noise figure of 1.4dB, a high gain of 15dB, and an input third-order intercept point (IP3) of -4dBm. The mixer has a noise f...