MAX2820 Datasheet, PDF (1/23 Pages) Maxim Integrated Products – 2.4GHz 802.11b Zero-IF Transceivers

19-2493; Rev 2; 11/03
2.4GHz 802.11b Zero-IF Transceivers
General Description
The MAX2820/MAX2821 single-chip zero-IF transceivers
are designed for the 802.11b (11Mbps) applications
operating in the 2.4GHz to 2.5GHz ISM band. The trans-
ceivers are nearly identical, except the MAX2821 pro-
vides a low-power shutdown mode and an analog
voltage reference output feature and the MAX2820 does
not. The transceivers include all the circuitry required to
implement an 802.11b RF-to-baseband transceiver solu-
tion, providing a fully integrated receive path, transmit
path, VCO, frequency synthesis, and baseband/control
interface. Only a PA, RF switch, RF BPF, and a small
number of passive components are needed to form the
complete radio front-end solution.
The ICs eliminate the need for external IF and base-
band filters by utilizing a direct-conversion radio archi-
tecture and monolithic baseband filters for both
receiver and transmitter. They are specifically opti-
mized for 802.11b (11Mbps CCK) 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 devices are suitable for the full range of 802.11b
data rates (1Mbps, 2Mbps, 5.5Mbps, and 11Mbps) and
also the higher-rate 22Mbps PBCC^TM standard. The
MAX2820/MAX2821 are available in the very small 7mm
× 7mm 48-lead QFN package.
Applications
802.11b 11Mbps WLAN
802.11b⁺ 22Mbps PBCC High-Data-Rate WLAN
802.11a + b Dual-Band WLAN
2.4GHz ISM Band Radios
PBCC is a trademark of Texas Instruments, Inc.
Pin Configuration/Functional Diagram and Typical
Application Circuit appear at end of data sheet.
Features
o 2.4GHz to 2.5GHz ISM Band Operation
o 802.11b (11Mbps CCK and 22Mbps PBCC) PHY
Compatible
o Complete RF-to-Baseband Transceiver
Direct-Conversion Upconverters and
Downconverters
Monolithic Low-Phase-Noise VCO
Integrated Baseband Lowpass Filters
Integrated PLL with 3-Wire Serial Interface
Digital Bias Control for External PA
Transmit Power Control (Range > 25dB)
Receive Baseband AGC (Range > 65dB)
Complete Baseband Interface
Digital TX/RX Mode Control
Analog Receive Level Detection
o -97dBm RX Sensitivity at 1Mbps
o -87dBm RX Sensitivity at 11Mbps
o +2dBm Transmit Power (11Mbps CCK)
o Single +2.7V to +3.6V Supply
o Low-Current Shutdown Mode (MAX2821 only)
o Very Small 48-Pin QFN Package (s)
PART
MAX2820EGM-TD
MAX2820ETM+TD
MAX2821EGM-TD
MAX2821ETM+TD
Ordering Information
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
48 QFN
48 QFN Lead Free
48 QFN
48 QFN Lead Free
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.