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MAX2021：High-Dynamic-Range, Direct Up-/Downconversion 650MHz to 1200MHz Quadrature Mod/Demod

Highest Linearity, Lowest Noise, 1GHz ZIF Modulator/Demodulator Enables Four-Carrier WCDMA Tx

The MAX2021 low-noise, high-linearity, direct upconversion/downconversion quadrature modulator/demodulator is designed for RFID handheld and portal readers, as well as single and multicarrier 650MHz to 1200MHz GSM/EDGE, cdma2000®, WCDMA, and iDEN® base-station applications. Direct conversion architectures are advantageous since they significantly reduce transmitter or receiver cost, part count, and power consumption as compared to traditional IF-based double conversion systems. In addition to offering excellent linearity and noise performance, the MAX2021 also yields a high level of component integration. This device includes two matched passive mixers for modulating or demodulating in-phase and quadrature signals, two LO mixer amplifier drivers, and an LO quadrature splitter. On-chip baluns are also integrated to allow for single-ended RF and LO connections. As an added feature, the baseband inputs have been matched to allow for direct interfacing to the transmit DAC, thereby eliminating the need for costly I/Q buffer amplifiers. The MAX2021 operates from a single +5V supply. It is available in a compact 36-pin TQFN package (6mm x 6mm) with an exposed pad. Electrical performance is guaranteed over the extended -40°C to +85°C temperature range.

Key Features 650MHz to 1200MHz RF Frequency Range Scalable Power: External Current-Setting Resistors Provide Option for Operating Device in Reduced-Power/Reduced-Performance Mode 36-Pin, 6mm x 6mm TQFN Provides High Isolation in a Small Package Meets 4-Carrier WCDMA 65dBc ACLR +21dBm Typical OIP3 +58dBm Typical OIP2 +16.7dBm Typical OP1dB -32dBm Typical LO Leakage 43.5dBc Typical Sideband Suppression -174dBm/Hz Output Noise Density DC to 550MHz Baseband Input Allows a Direct Launch DAC Interface, Eliminating the Need for Costly I/Q Buffer Amplifiers DC-Coupled Input Allows Ability for Customer Offset Voltage Control +35.2dBm Typical IIP3 +76dBm Typical IIP2 > 30dBm IP1dB 9.2dB Typical Conversion Loss 9.3dB Typical NF 0.06dB Typical I/Q Gain Imbalance 0.15° I/Q Typical Phase Imbalance

MAX2021: Typical Operating Circuit Applications/Uses Cable Modem Termination Systems (CMTS) Digital and Spread-Spectrum Communication Systems Fixed Broadband Wireless Access GSM 850/GSM 900 EDGE Base Stations Microwave Links Military Systems Predistortion Transmitters and Receivers RFID Handheld and Portal Readers Single and Multicarrier cdmaOne™ and cdma2000® Base Stations Single and Multicarrier WCDMA 850 Base Stations Video-on-Demand (VOD) and DOCSIS® Compliant Edge QAM Modulation WiMAX Transmitters and Receivers

DataSheet

Parametrics

Design kits & evaluation modules

• MAX2021EVKIT

Quality and Environmental Data

• MAX2021.pdf

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