MAX2420

19-1234; Rev 2; 2/99 UAL IT MAN TION K A ET U E L H A S EV TA WS DA FOLLO 900MHz Image-Reject Transceivers Features o Receive/Transmit Mixers with 35dB Image Rejection o Adjustable-Gain LNA o Up to +2dBm Combined Receiver Input IP3 o 4dB Combined Receiver Noise Figure o >35dB of Transmit Power Control Range o PA Predriver Provides up to +2dBm o Low Current Consumption: 23mA Receive 26mA Transmit 9.5mA Oscillator o 0.5µA Shutdown Mode o Operates from Single +2.7V to +4.8V Supply General Description The MAX2420/MAX2421/MAX2422/MAX2460/MAX2463 are highly integrated front-end ICs that provide the lowest cost solution for cordless phones and ISM-band radios operating in the 900MHz band. All devices incorporate transmit and receive image-reject mixers to reduce filter cost. They operate with a +2.7V to +4.8V power supply, allowing direct connection to a 3-cell battery stack. The receive path incorporates an adjustable-gain LNA and an image-reject downconverter with 35dB image suppression. These features yield excellent combined downconverter noise figure (4dB) and high linearity with an input third-order intercept point (IP3) of up to +2dBm. The transmitter consists of a variable-gain IF amplifier with more than 35dB control range, an image-reject upconverter with 35dB image rejection, and a poweramplifier (PA) predriver that produces up to +2dBm (in some applications serving as the final power stage). All devices include an on-chip local oscillator (LO), requiring only an exter...