Dual, SiGe, High-Linearity, 700MHz to 1000MHz Downconversion Mixer with LO Buffer/Switch

Highest Linearity, Lowest Noise 700MHz to 1000MHz Downconverting SiGe Mixer for 2.5G and 3G Base Stations

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The MAX9985 high-linearity, dual-channel downconversion mixer is designed to provide approximately 6dB gain, +28.5dBm of IIP3, and 10.5dB of noise figure (NF) ideal for diversity receiver applications. With a 700MHz to 1000MHz RF frequency range and a 570MHz to 865MHz LO frequency range, this mixer is ideal for lowside LO injection architectures. In addition, the broad frequency range makes the MAX9985 ideal for GSM 850/950, 2G/2.5G EDGE, WCDMA, cdma2000®, and iDEN® base-station applications.

The MAX9985 dual-channel downconverter achieves a high level of component integration. The MAX9985 integrates two double-balanced active mixer cores, two LO buffers, a dual-input LO selectable switch, and a pair of differential IF output amplifiers. In addition, integrated on-chip baluns at the RF and LO ports allow for single-ended RF and single-ended LO inputs. The MAX9985 requires a typical 0dBm LO drive. Supply current is adjustable up to 400mA.

The MAX9985 is available in a 36-pin thin QFN package (6mm x 6mm) with an exposed paddle. Electrical performance is guaranteed over the extended temperature range, from TC = -40°C to +100°C.

MAX9985: Pin Configuration MAX9985: Pin Configuration Enlarge+

Key Features

  • 700MHz to 1000MHz RF Frequency Range
  • 570MHz to 865MHz LO Frequency Range
  • 50MHz to 250MHz IF Frequency Range
  • 6dB Typical Conversion Gain
  • 10.5dB Typical Noise Figure
  • +28.5dBm Typical Input IP3
  • +16.2dBm Typical Input 1dB Compression Point
  • 77dBc Typical 2RF-2LO Spurious Rejection at PRF = -10dBm
  • Dual Channels Ideal for Diversity Receiver Applications
  • 47dB Typical Channel-to-Channel Isolation
  • -3dBm to +3dBm LO Drive
  • Integrated LO Buffer
  • Internal RF and LO Baluns for Single-Ended Inputs
  • Built-In SPDT LO Switch with 43dB LO1-to-LO2 Isolation and 50ns Switching Time
  • Pin-Compatible with MAX9995 1700MHz to 2200MHz Mixer
  • Lead(Pb)-Free Package


  • 850MHz WCDMA Base Stations
  • cdmaOne™ and cdma2000® Base Stations
  • Digital and Spread-Spectrum Communication Systems
  • Fixed Broadband Wireless Access
  • GSM 850/GSM 950, 2G/2.5G EDGE Base Stations
  • iDEN® Base Stations
  • Microwave Links
  • Military Systems
  • Private Mobile Radios
  • Wireless Local Loop

See parametric specs for Downconverter Mixers (27)

Part NumberChannelsRF Freq.
RF Freq.
LO Frequency
LO Frequency
IF Frequency
IF Frequency
Input IP3
Noise Figure
2RF-2LO/ 2LO-2RF
5V Supply Current
(mm x mm)
minmaxminmaxminmaxSee Notes
MAX9985 2700100057086550250628.510.5774.75 to 5.254006.0 x 6.0
$12.58 @1k

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.

Technical Documents

Tutorial 5100 General Layout Guidelines for RF and Mixed-Signal PCBs
Product Reliability Reports: MAX9985.pdf 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

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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Type ID Title
Evaluation Board5560MAX9985EVKIT MAX9985 Evaluation Kit