MAX9981:825MHz to 915MHz, Dual SiGe High-Linearity Active Mixer

Industry's First Dual SiGe Mixer Reduces Cost, Space, and Component Count for 2.5G and 3G BTS Designs

The MAX9981 dual high-linearity mixer integrates a local oscillator (LO) switch, LO buffer, LO splitter, and two active mixers. On-chip baluns allow for single-ended RF and LO inputs. The active mixers eliminate the need for an additional IF amplifier because the mixer provides a typical overall conversion gain of 2.1dB. The MAX9981 active mixers are optimized to meet the demanding requirements of GSM850, GSM900, and CDMA850 base-station receivers. These mixers provide exceptional linearity with an input IP3 of greater than +27dBm. The integrated LO driver allows for a wide range of LO drive levels from -5dBm to +5dBm. In addition, the built-in high-isolation switch enables rapid LO selection of less than 250ns, as needed for GSM transceiver designs. The MAX9981 is available in a 36-pin QFN package (6mm x 6mm) with an exposed paddle, and is specified over the -40°C to +85°C extended temperature range.

Key Features
  • +27.3dBm Input IP3
  • +13.6dBm Input 1dB Compression Point
  • 825MHz to 915MHz RF Frequency Range
  • 70MHz to 170MHz IF Frequency Range
  • 725MHz to 1085MHz LO Frequency Range
  • 2.1dB Conversion Gain
  • 10.8dB Noise Figure
  • 42dB Channel-to-Channel Isolation
  • -5dBm to +5dBm LO Drive
  • +5V Single-Supply Operation
  • Built-In LO Switch with 52dB LO1 to LO2 Isolation
  • ESD Protection
  • Integrated RF and LO Baluns for Single-Ended Inputs
MAX9981: Pin Configuration
MAX9981: Pin Configuration
  • Cellular cdmaOne? and cdma2000? Base Station Receivers
  • Digital and Spread-Spectrum Communication Systems
  • GSM 850/GSM 900 2G and 2.5G EDGE Base Station Receivers
  • Microwave Point-to-Point Links
  • TDMA and Integrated Digital Enhanced Network (iDEN?) Base-Station Receivers
titleDownload file
MAX9981?Data SheetMAX9981.pdf
Part NumberChannelsRF Freq.
RF Freq.
LO Freq.
LO Freq.
IF Freq.
IF Freq.
Input IP3
Noise Figure
2RF-2LO/ 2LO-2RF
5V Supply Current
(mm x mm)
minmaxminmaxminmaxSee Notes
MAX998128259157251085701702.127.310.848.24.75 to 5.252916.0 x 6.0TQFN/36$12.25 @1k
Design kits & evaluation modules
Related Products
  • MAX9982:825MHz to 915MHz, SiGe High-Linearity Active Mixer
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX9981ETXNo Longer AvailableMAX9981ETX+TQFN,;36 pin;37.2 mm?-40°C to +85°CNo
MAX9981ETX+ActiveTQFN,;36 pin;37.2 mm?-40°C to +85°CLead Free
MAX9981ETX+DActiveQFN;36 pin-40°C to +85°CSee data sheet
MAX9981ETX+TActiveQFN;36 pin-40°C to +85°CSee data sheet
MAX9981ETX+TDActiveQFN;36 pin-40°C to +85°CSee data sheet
MAX9981ETX-TNo Longer AvailableMAX9981ETX+TQFN;36 pin-40°C to +85°CSee data sheet
MAX9981.pdf MAX9981
MAX9981.pdf MAX9981
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