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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

Product Details

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.

Key Features

  • 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

Applications/Uses

  • 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
Parametric specs for Downconverter Mixers
# Channels 2
RF Freq. (MHz) (min) 700
RF Freq. (MHz) (max) 1000
LO Frequency (MHz) (min) 570
LO Frequency (MHz) (max) 865
IF Frequency (MHz) (min) 50
IF Frequency (MHz) (max) 250
Gain (dB) 6
Input IP3 (dBm) 28.5
Noise Figure (dB) 10.5
2RF-2LO/ 2LO-2RF (dBc) 77
VCC (V) 4.75 to 5.25
5V Supply Current (mA) 400
Footprint (mm x mm) 6.0 x 6.0
Package/Pins TQFN/36
Budgetary
Price (See Notes)
$12.58 @1k
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Simplified Block Diagram

MAX9985: Pin Configuration MAX9985: Pin Configuration Zoom icon

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Parameters

Parametric specs for Downconverter Mixers
# Channels 2
RF Freq. (MHz) (min) 700
RF Freq. (MHz) (max) 1000
LO Frequency (MHz) (min) 570
LO Frequency (MHz) (max) 865
IF Frequency (MHz) (min) 50
IF Frequency (MHz) (max) 250
Gain (dB) 6
Input IP3 (dBm) 28.5
Noise Figure (dB) 10.5
2RF-2LO/ 2LO-2RF (dBc) 77
VCC (V) 4.75 to 5.25
5V Supply Current (mA) 400
Footprint (mm x mm) 6.0 x 6.0
Package/Pins TQFN/36
Budgetary
Price (See Notes)
$12.58 @1k

Key Features

  • 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

Applications/Uses

  • 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

Description

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.

Simplified Block Diagram

MAX9985: Pin Configuration MAX9985: Pin Configuration Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal