The MAX9987 and MAX9988 LO buffers/splitters each integrate a passive two-way power splitter with highisolation input and output buffer amplifiers. These buffers are designed to provide the high output (+14dBm to +20dBm) necessary to drive the LO inputs of high-linearity passive mixers, while offering 40dB reverse isolation to prevent LO pulling. The MAX9987 is internally matched for the cellular/GSM bands, and the MAX9988 is matched for the DCS/PCS/UMTS bands. The typical application circuit provides a nominal +17dBm output power with ±1dB variation over supply, temperature, and input power. With two optional resistors, the output power can be precision set from +14dBm to +20dBm. The devices offer more than 30dB output-to-output port isolation, and are offered in 5mm x 5mm 20-pin thin QFN packages with exposed paddle.
title | Download file |
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MAX9987-MAX9988 Data Sheet | MAX9987-MAX9988.pdf |
Part Number | LO Driver Outputs | PLL Driver Outputs | RF Freq. (MHz) | RF Freq. (MHz) | POUT (dBm) | POUT (dBm) | VCC (V) | ISUPPLY (mA) | Footprint (mm x mm) | Package/Pins |
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min | max | min | max | |||||||
MAX9987 | Yes | Yes | 700 | 1100 | 14.3 | 19.7 | 4.75 to 5.25 | 155 | 5.0 x 5.0 | TQFN/20 |
MAX9988 | 1500 | 2200 | 14.2 | 19.5 | 162 | TQFN/20 | ||||
Part Number | Status | Recommended Replacement | Package | Temp | RoHS |
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MAX9987ETP | No Longer Available | MAX9987ETP+ | TQFN,;20 pin;26 mm² | -40°C to +85°C | No |
MAX9987ETP+ | Active | TQFN,;20 pin;26 mm² | -40°C to +85°C | Lead Free | |
MAX9987ETP+T | Active | TQFN,;20 pin;26 mm² | -40°C to +85°C | Lead Free | |
MAX9987ETP-T | No Longer Available | MAX9987ETP+T | QFN;20 pin | -40°C to +85°C | See data sheet |