MAX9990:+14dBm to +20dBm LO Buffers with ±1dB Variation

The MAX9989 and MAX9990 LO buffers provide the high output (+14dBm to +20dBm) necessary to drive the LO inputs of high-linearity passive mixers, while offering 40dB reverse isolation to prevent LO pulling. The MAX9989 is internally matched for the cellular/GSM bands, and the MAX9990 is matched for the DCS/PCS/UMTS bands. The Typical Application Circuit provides a nominal +17dBm output power with ±1dB variation over supply, temperature, and input power. With two optional resistors, the output power can be precision set from +14dBm to +20dBm. The devices offer more than 35dB main driver output to PLL amp output isolation. Each device is offered in a 5mm x 5mm 20-pin thin QFN package with exposed paddle.

Key Features
  • ±1dB Output Power Variation
  • +14dBm to +20dBm Adjustable Output Power
  • 40dB Reverse Isolation
  • Better Than 35dB Main Driver Output to PLL Amp Output Isolation
  • Low Output Noise: -170dBc/Hz at +17dBm
  • 110mA Supply Current at +17dBm
  • ESD Protection
  • Isolated PLL Output (+3dBm)
MAX9989, MAX9990: Typical Operating Circuit
MAX9989, MAX9990: Typical Operating Circuit
  • Cellular/GSM/DCS/PCS/UMTS Base Station Tx/Rx LO Drive
  • Coherent Receivers
  • ISM Wireless LAN
  • Local Multipoint Distribution Service
  • Point-to-Point Systems
  • Wireless Local Loop (WLL)
titleDownload file
MAX9989-MAX9990?Data SheetMAX9989-MAX9990.pdf
Part NumberLO Driver OutputsPLL Driver OutputsRF Freq.
RF Freq.
(mm x mm)
minmaxminmaxSee Notes
MAX9989YesYes700110014.319.74.75 to 5.251055.0 x 5.0TQFN/20$3.60 @1k
MAX99901500220014.219.5111TQFN/20$3.53 @1k
Design kits & evaluation modules
Related Products
  • MAX9987:+14dBm to +20dBm LO Buffers/Splitters with ±1dB Variation
  • MAX9988:+14dBm to +20dBm LO Buffers/Splitters with ±1dB Variation
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX9990ETPNo Longer AvailableMAX9990ETP+TQFN,;20 pin;26 mm?-40°C to +85°CNo
MAX9990ETP+ActiveTQFN,;20 pin;26 mm?-40°C to +85°CLead Free
MAX9990ETP+TActiveQFN;20 pin-40°C to +85°CSee data sheet
MAX9990ETP-TNo Longer AvailableMAX9990ETP+TQFN;20 pin-40°C to +85°CSee data sheet
MAX9989-MAX9990.pdf MAX9990
Simplifying Tomorrow's LO Drive Designs with the MAX9987-90 Family of LO Buffers/Splitters MAX9990
MAX9989-MAX9990.pdf MAX9990
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