2.4GHz 802.11b Zero-IF Transceiver with Integrated PA and Tx/Rx Switch

The MAX2822 single-chip transceiver is designed for 802.11b (11Mbps) applications operating in the 2.4GHz to 2.5GHz ISM band. The transceiver includes all the circuitry required to implement an 802.11b RF-to-baseband transceiver solution, including the power amplifier, transmit/receive switch, and 50Ω matching. The fully integrated receive path, transmit path, VCO, frequency synthesis, and baseband/control interface provide all the required active RF circuitry. Only a small number of passive components are needed to form the complete radio front-end solution.

The IC eliminates the need for external IF SAW and RF image-reject filters by utilizing a direct-conversion radio architecture and monolithic baseband filters for both receiver and transmitter. It is specifically optimized for 802.11b (11Mbps CCK) and 22Mbps PBCC™ applications. The baseband filtering and Rx and Tx signal paths support the CCK modulation scheme for BER = 10-5 at the required sensitivity levels.

The transceiver is suitable for the full range of 802.11b data rates (1Mbps, 2Mbps, 5.5Mbps, and 11Mbps) as well as the higher-rate 22Mbps PBCC standard. The MAX2822 is available in the very small 7mm x 7mm 48-lead QFN or thin QFN packages. The small solution size makes it ideal for small form-factor 802.11b applications such as PDAs, SmartPhones, and embedded modules.

Applications

* 802.11b Embedded Modules * 802.11b PC Cards, Mini-PCI Cards * 802.11b PDAs and Smartphones

* 2.4GHz to 2.5GHz ISM Band Operation

* 802.11b (11Mbps CCK and 22Mbps PBCC) PHY Compatible

* Integrated +17dBm PA

* Integrated PA Power Detector

* Integrated Transmit/Receive Switch

* Complete RF-to-Baseband Transceiver

* Direct Up/Down Conversion

* Monolithic Low-Phase-Noise VCO

* Integrated Baseband Lowpass Filters

* Integrated PLL with 3-Wire Serial Interface

* Digital Bias Control for PA

* Transmit Power Control

* Receive Baseband AGC

* Complete Baseband Interface

* Digital Tx/Rx Mode Control

* -95dBm Rx Sensitivity at 1Mbps

* -85dBm Rx Sensitivity at 11Mbps

* Single +2.7V to +3.0V Supply

* 2µA Shutdown Mode

* Very Small 48-Pin QFN Package