MAX9981 Datasheet | Maxim Integrated

Description 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 2.1d B. 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 +27d Bm. The integrated LO driver allows for a wide range of LO drive levels from -5d Bm to +5d Bm. 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 ✕ 6mm) with an exposed paddle, and is specified over the -40°C to +85°C extended temperature range. Features o +27.3d Bm Input IP3 o +13.6d Bm Input 1d B pression Point o 825MHz to 915MHz RF Frequency Range o o o o o o o o 70MHz to 170MHz IF Frequency Range 725MHz to 1085MHz LO Frequency Range 2.1d B Conversion Gain 10.8d B Noise Figure 42d B Channel-to-Channel Isolation -5d Bm to +5d Bm LO Drive +5V Single-Supply Operation Built-In LO Switch with 52d B LO1 to LO2 Isolation MAX9981 o ESD Protection o Integrated RF and LO Baluns for Single-Ended Inputs Applications GSM850/GSM900 2G and 2.5G EDGE Base Station Receivers Cellular cdma One™ and cdma2000™ Base Station Receivers TDMA and Integrated Digital Enhanced Network (i DEN)™ Base-Station Receivers Digital and Spread-Spectrum munication Systems Microwave Point-to-Point Links RFMAIN TAPMAIN MAINBIAS GND GND GND DIVBIAS TAPDIV 1 2 3 4 5 6 7 8 9 Ordering Information PART MAX9981EGX-T TEMP RANGE PIN-PACKAGE -40°C to +85°C 36 QFN-EP- (6mm × 6mm) - EP = Exposed paddle. Pin Configuration/ Functional Diagram IFMAIN+ TOP VIEW VCC GND GND IFMAIN- GND 29 27 LO2 26 GND 25 GND 24...