MAX9985

PRODUCTION

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

Data Sheet (Rev. 1) Product Selection Table
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Overview

  • 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

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.

Applications

  • 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
MAX9985
Dual, SiGe, High-Linearity, 700MHz to 1000MHz Downconversion Mixer with LO Buffer/Switch
MAX9985: Pin Configuration
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Documentation

Data Sheet 1

Reliability Data 1

Technical Articles 1

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Modulators & Demodulators 2
MAX2021
PRODUCTION High-Dynamic-Range, Direct Up-/Downconversion 650MHz to 1200MHz Quadrature Mod/Demod
MAX2022
PRODUCTION High-Dynamic-Range, Direct Up/Downconversion 1500MHz to 3000MHz Quadrature Modulator/Demodulator
Oscillators 4
MAX9987
+14dBm to +20dBm LO Buffers/Splitters with ±1dB Variation
MAX9988
Obsolete +14dBm to +20dBm LO Buffers/Splitters with ±1dB Variation
MAX9989
PRODUCTION +14dBm to +20dBm LO Buffers with ±1dB Variation
MAX9990
+14dBm to +20dBm LO Buffers with ±1dB Variation
RF Mixers 14
MAX9981
825MHz to 915MHz, Dual SiGe High-Linearity Active Mixer
MAX9982
825MHz to 915MHz, SiGe High-Linearity Active Mixer
MAX9984
PRODUCTION SiGe High-Linearity, 400MHz to 1000MHz Downconversion Mixer with LO Buffer/Switch
MAX9986
LAST TIME BUY SiGe High-Linearity, 815MHz to 995MHz Downconversion Mixer with LO Buffer/Switch
MAX9986A
PRODUCTION SiGe High-Linearity, 815MHz to 1000MHz Downconversion Mixer with LO Buffer/Switch
MAX9993
LAST TIME BUY High-Linearity 1700MHz to 2200MHz Down-Conversion Mixer with LO Buffer/Switch
MAX9994
PRODUCTION SiGe High-Linearity, 1400MHz to 2200MHz Downconversion Mixer with LO Buffer/Switch
MAX9995
LAST TIME BUY Dual, SiGe, High-Linearity, 1700MHz to 2700MHz Downconversion Mixer with LO Buffer/Switch
MAX9996
PRODUCTION SiGe High-Linearity, 1700MHz to 2200MHz Downconversion Mixer with LO Buffer/Switch
MAX2029
PRODUCTION High-Linearity, 815MHz to 1000MHz Upconversion/Downconversion Mixer with LO Buffer/Switch
MAX2031
PRODUCTION High-Linearity, 650MHz to 1000MHz Upconversion/Downconversion Mixer with LO Buffer/Switch
MAX2039
Obsolete High-Linearity, 1700MHz to 2200MHz Upconversion/Downconversion Mixer with LO Buffer/Switch
MAX2041
PRODUCTION High-Linearity, 1700MHz to 3000MHz Upconversion/Downconversion Mixer with LO Buffer/Switch
MAX2043
1700MHz to 3000MHz High-Linearity, Low LO Leakage Base-Station Rx/Tx Mixer
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