The MAX9985 is a high-linearity, dual-channel downconversion mixer designed to provide approximately 6dB gain, +28.5dBm of IIP3 and 10.5dB of noise figure (NF) ideal for diversity receiver applications.
The MAX9985 is a high‑linearity, dual‑channel downconversion mixer designed for diversity receiver applications. It covers an RF range of 700 MHz to 1000 MHz and an LO range of 570 MHz to 865 MHz, making it suitable for GSM, WCDMA, CDMA, iDEN, and other broadband wireless base‑station systems.
Key features include approximately 6 dB conversion gain, +28.5 dBm IIP3, 10.5 dB typical noise figure, integrated LO buffers and SPDT switch, on‑chip baluns for single‑ended inputs, and a 36‑pin thin QFN package with exposed paddle. The datasheet provides absolute maximum ratings, DC/AC electrical characteristics, typical operating curves, and pin‑out diagrams.
| RF Frequency Range | 700 MHz to 1000 MHz |
|---|---|
| LO Frequency Range | 570 MHz to 865 MHz |
| IF Frequency Range | 50 MHz to 250 MHz |
| Typical Conversion Gain | 6 dB |
| Typical Noise Figure | 10.5 dB |
| Typical IIP3 | +28.5 dBm |
| LO Drive Requirement | -3 dBm to +3 dBm |
| Supply Voltage | 4.75 V to 5.25 V |
| Package | 36‑pin thin QFN (6 mm × 6 mm) with exposed paddle |
The MAX9985 provides a typical conversion gain of about 6 dB.
The device operates with an LO drive between –3 dBm and +3 dBm.
It is offered in a 36‑pin thin QFN package (6 mm × 6 mm) with an exposed paddle.
The recommended supply voltage is 4.75 V to 5.25 V.