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

Please check latest availability status for a specific part variant.


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.

MAX2021: Typical Operating Circuit MAX2021: Typical Operating Circuit Enlarge+

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
Modulator Operation:
  • 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
Demodulator Operation:
  • +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


  • 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
Part NumberBand/ Freq.
(mm x mm)
See Notes
MAX2021 750 to 12006.0 x 6.0
$6.73 @1k
See All I/Q Demodulators (3)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Part NumberFreq.
MAX2021 7501200
See All I/Q Modulators (3)

MAX2021EVKIT: Evaluation Kit for the MAX2021

Technical Documents

Tutorial 5100 General Layout Guidelines for RF and Mixed-Signal PCBs

Quality and Environmental Data

Product Reliability Reports: MAX2021.pdf 
Lead-Free Package Tin (Sn) Whisker Reports
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

Quality Management System >
Environmental Management System >


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