MAX9981

825MHz to 915MHz, Dual SiGe High-Linearity Active Mixer

Industry's First Dual SiGe Mixer Reduces Cost, Space, and Component Count for 2.5G and 3G BTS Designs

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Overview

+27.3dBm Input IP3
+13.6dBm Input 1dB Compression Point
825MHz to 915MHz RF Frequency Range
70MHz to 170MHz IF Frequency Range
725MHz to 1085MHz LO Frequency Range
2.1dB Conversion Gain
10.8dB Noise Figure
42dB Channel-to-Channel Isolation
-5dBm to +5dBm LO Drive
+5V Single-Supply Operation
Built-In LO Switch with 52dB LO1 to LO2 Isolation
ESD Protection
Integrated RF and LO Baluns for Single-Ended Inputs

The MAX9981 dual high-linearity mixer integrates a local oscillator (LO) switch, LO buffer, LO splitter, and two active mixers. On-chip baluns allow for single-ended RF and LO inputs. The active mixers eliminate the need for an additional IF amplifier because the mixer provides a typical overall conversion gain of 2.1dB.

The MAX9981 active mixers are optimized to meet the demanding requirements of GSM850, GSM900, and CDMA850 base-station receivers. These mixers provide exceptional linearity with an input IP3 of greater than +27dBm. The integrated LO driver allows for a wide range of LO drive levels from -5dBm to +5dBm. In addition, the built-in high-isolation switch enables rapid LO selection of less than 250ns, as needed for GSM transceiver designs.

The MAX9981 is available in a 36-pin QFN package (6mm x 6mm) with an exposed paddle, and is specified over the -40°C to +85°C extended temperature range.

Applications