SiGe, High-Linearity, 2300MHz to 4000MHz Downconversion Mixer with LO Buffer

Lowest Noise, Highest Linearity 2300MHz to 4000MHz SiGe Mixer for LTE, WiMAX and MMDS Base Stations, Featuring Superior IIP3, NF and 2 x 2 Performance

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The MAX19998 single, high-linearity downconversion mixer provides 8.7dB of conversion gain, +24.3dBm input IP3, +11.3dBm 1dB input compression point, and a noise figure of 9.7dB for 2300MHz to 4000MHz WiMAX™, LTE, and MMDS receiver applications. With an ultra-wide LO 2600MHz to 4300MHz frequency range, the MAX19998 can be used in either low-side or high-side LO injection architectures for virtually all 2.5GHz and 3.5GHz applications. For a 2.5GHz variant tuned specifically for high-side injection, refer to the MAX19996A.

In addition to offering excellent linearity and noise performance, the MAX19998 also yields a high level of component integration. This device includes a double-balanced passive mixer core, an IF amplifier, and an LO buffer. On-chip baluns are also integrated to allow for single-ended RF and LO inputs. The MAX19998 requires a nominal LO drive of 0dBm, and supply current is typically 230mA at VCC = 5.0V or 150mA at VCC = 3.3V.

The MAX19998 is pin compatible with the MAX19996/MAX19996A 2000MHz to 3900MHz mixer family. The device is also pin similar with the MAX9984/MAX9986/MAX9986A 400MHz to 1000MHz mixers and the MAX9993/MAX9994/MAX9996 1700MHz to 2200MHz mixers, making this entire family of downconverters ideal for applications where a common PCB layout is used for multiple frequency bands.

The MAX19998 is available in a compact, 5mm x 5mm, 20-pin thin QFN with an exposed pad. Electrical performance is guaranteed over the extended -40°C to +85°C temperature range.
MAX19998: Typical Application Circuit MAX19998: Typical Application Circuit Enlarge+

Key Features

  • 2300MHz to 4000MHz RF Frequency Range
  • 2600MHz to 4300MHz LO Frequency Range
  • 50MHz to 500MHz IF Frequency Range
  • 8.7dB Conversion Gain
  • 9.7dB Noise Figure
  • +24.3dBm Typical Input IP3
  • +11.3dBm Typical Input 1dB Compression Point
  • 67dBc Typical 2RF - 2LO Spurious Rejection at PRF = -10dBm
  • Integrated LO Buffer
  • Integrated RF and LO Baluns for Single-Ended Inputs
  • Low -3dBm to +3dBm LO Drive
  • Pin Compatible with the MAX19996/MAX19996A 2000MHz to 3900MHz Mixers
  • Pin Similar with the MAX9984/MAX9986/MAX9986A Series of 400MHz to 1000MHz Mixers and the MAX9993/MAX9994/MAX9996 Series of 1700MHz to 2200MHz Mixers
  • Single 5.0V or 3.3V Supply
  • External Current-Setting Resistors Provide Option for Operating Device in Reduced-Power/Reduced-Performance Mode


  • 2.5GHz WiMAX and LTE Base Stations
  • 2.7GHz MMDS Base Stations
  • 3.5GHz WiMAX and LTE Base Stations
  • Fixed Broadband Wireless Access
  • Military Systems
  • Private Mobile Radios
  • Wireless Local Loop

Technical Documents

Tutorial 5100 General Layout Guidelines for RF and Mixed-Signal PCBs
Request Reliability Report for: MAX19998 
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.

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