Dual, SiGe, High-Linearity, 700MHz to 1000MHz Downconversion Mixer with LO Buffer/Switch

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

* 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