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

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

* Cellular cdmaOne™ and cdma2000® Base Station Receivers * Digital and Spread-Spectrum Communication Systems * GSM 850/GSM 900 2G and 2.5G EDGE Base Station Receivers * Microwave Point-to-Point Links * TDMA and Integrated Digital Enhanced Network (iDEN®) Base-Station Receivers

* +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