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
Applications/Uses
  • 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
DataSheet
titleDownload file
MAX9981?Data SheetMAX9981.pdf
Parametrics
Part NumberChannelsRF Freq.
(MHz)
RF Freq.
(MHz)
LO Freq.
(MHz)
LO Freq.
(MHz)
IF Freq.
(MHz)
IF Freq.
(MHz)
Gain
(dB)
Input IP3
(dBm)
Noise Figure
(dB)
2RF-2LO/ 2LO-2RF
(dBc)
VCC
(V)
5V Supply Current
(mA)
Footprint
(mm x mm)
Package/PinsBudgetary
Price
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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