AD6411

a FEATURES Fully Compliant with DECT Specifications Single IC DECT Radio Integrated UHF VCO (External Resonator) Integrated Synthesizer Supporting Extended Frequency Allocation Built-In Supply Regulation Direct VCO Modulation for DECT Transmit Path PLL-Based Demodulator Use with Low Cost Plastic Packaged SAW Filters Ultralow Power Design Operates from +3.0 V to +5.5 V Battery User-Selectable Power-Down Modes Small 48-Lead LQFP Package APPLICATIONS DECT Cordless Telephones DECT-Based Wireless Local Loop Systems DECT-Based Wireless Data Systems DESCRIPTION DECT RF Transceiver AD6411 FUNCTIONAL BLOCK DIAGRAM PLL DEMODULATOR LNA RX DATA RSSI PLL VCO PA PFD TX DATA AD6411 CONTROL INTERFACE The AD6411 provides the complete transmit and receive RF signal processing necessary to implement a digital wireless transceiver based on the Digital Enhanced Cordless Telecommunications (DECT) standard. The AD6411’s receive signal path consists of a mixer, IF amplifiers and PLL demodulator. The low noise, high intercept mixer is a development of the doubly-balanced Gilbert-Cell type. It has a nominal –16 dBm input-referred 1 dB compression point and a –8 dBm input referred third-order intercept. The limiter amplifier provides sufficient gain to drive the PLL demodulator, which provides selectable analog or sliced outputs. The RSSI output provides a voltage proportional to the receive signal strength. It measures nearly 100 dB IF signal strength range with 14 mV/dB gain scaling. The tr...