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MAX9985：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

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

MAX9985: Pin Configuration 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

DataSheet

Parametrics

Design kits & evaluation modules

• MAX9985EVKIT

Quality and Environmental Data

• MAX9985.pdf

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