MAX2685 Datasheet | Maxim Integrated

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: +15d B/-12d B NF: 1.4d B/12d B Input IP3: -4d Bm/+16d Bm o Mixer Performance (High/Low Gain) Gain: 6d B/4.6d B NF: 13d B/12d B Input IP3: +7d Bm/-1.5d Bm o Supply Current 8.5m A (High Gain) 3.8m A (Low Gain) o <0.1µA Supply Current in Shutdown Mode o 0.8µs Receiver Enable Time The MAX2685’s low-noise amplifier (LNA) and downconverter mixer prise 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 8.5m A (high-gain mode) and 3.8m A (low-gain mode) plus a low operating supply voltage range of +2.7V to +5.5V make it suitable for use in 3-cell Ni Cd 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 1.4d B, a high gain of 15d B, and an input third-order intercept point (IP3) of -4d Bm. The mixer has a noise figure of 13d B, a gain of 6d B, and an input IP3 of +7d Bm. In addition, an LNA bypass switch allows two levels of gain, reducing power consumption when high gain is not needed. The downconverter mixer has a single-ended RF input port and differential IF output ports. Differential operation of the IF ports offers improved even-order harmonic rejection and increased immunity to noise. An LO buffer allows the LO port to be driven with only -8d Bm of LO power. The MAX2685 is offered in a space-saving 16pin QSOP package. Ordering Information PART MAX2685EEE TEMP. RANGE -40°C to +85°C PIN-PACKAGE 16 QSOP Applications Cellular/Cordless Phones...