GENERAL DESCRIPTION

The ML2721 can be used as a single chip digital cordless telephone transceiver or general purpose Frequency Shift Keying (FSK) radio transceiver. It is designed to work in the 902 to 928MHz ISM band under FCC Part 15 regulations. The device integrates all the frequency generation, receive and transmit functions for data rates up to 1.5Mbps. A complete radio only requires the addition of an antenna switch. Micro Linear’s ML2751 is an integrated 100mW power amplifier and receive LNA with transmit/receive PIN diode drivers, and it can be used with the ML2721 for extended range capability.

FEATURES

■ Single chip 900MHz Radio Transceiver

■ Fully integrated filters for all IF, FM discriminator and data filtering

■ Image reject mixer & proprietary Low IF architecture reduce the need for RF filtering

■ Integrated 1.83GHz frequency synthesizer with internal VCO resonator

■ TX/RX calibration for max power transmission

■ Modulation compensation for improved sensitivity performance

■ PLL Programmed via 3-wire interface

■ DC regulation for 2.7V to 5.0V operation (IC performance is reduced from 2.7V to 3.2V)

■ PLL lock detect output

■ Analog Received Signal Strength Indication (RSSI) output to baseband IC

■ Easily upgradable for extended range with ML2751

APPLICATIONS

■ 900MHz DSSS cordless phones

■ 900 to 930MHz radio transceivers with ranges from 10 feet to 1000 feet and data rates to 1.5Mbps

■ Single IC 900MHz low power radio

■ FCC Part 15 compliant radio links

■ Portable computer/PDA

■ TDD and TDMA radios