The MAX2850 is a single-chip, 4-channel RF transmitter IC designed for 5GHz wireless HDMI applications. It includes all circuitry required to implement the complete 4-channel MIMO RF transmitter function and crystal oscillator, providing a fully integrated transmit path, VCO, frequency synthesis, and baseband/control interface. It includes a fast-settling, sigma-delta RF fractional synthesizer with 76Hz frequency programming step size. The IC also integrates on-chip I/Q amplitude and phase-error calibration circuits. Dynamic on/off control of four external PAs is implemented with programmable precision voltages. A 4-to-1 analog mux routes external PA power-detect voltages to the RSSI pin. On-chip monolithic filters are included for transmitter I/Q baseband signal reconstruction to support both 20MHz and 40MHz RF channels. The baseband filtering and Tx signal paths are optimized to meet stringent WHDI requirements. The upconverter local oscillator is coherent among all the transmitter channels. The reverse-link control channel uses an on-chip 5GHz OFDM receiver. It shares the RF synthesizer and LO generation circuit with the MIMO transmitter.
The MAX2850 is a single‑chip, 4‑channel RF transmitter IC designed for 5 GHz wireless HDMI (WHDI) and Wi‑Max applications. It integrates a crystal oscillator, sigma‑delta fractional‑N PLL with 76 Hz step size, on‑chip I/Q calibration, and a 4‑to‑1 analog mux for PA power‑detect signals.
Typical applications include 5 GHz Wireless HDMI, 8 GHz FDD backhaul, and beam‑steering transmitters. The device offers programmable PA on/off control, 31 dB gain‑control range, and a small 68‑pin thin QFN package.
| Frequency range | 4900 MHz to 5900 MHz |
|---|---|
| Supply voltage (VCC) | 2.7 V to 3.6 V |
| Maximum transmit power | -5 dBm |
| Gain‑control range | 31 dB (0.5 dB step) |
| Package type | 68‑pin thin QFN (10 mm × 10 mm) |
| Programming step size (PLL) | 76 Hz |
| Operating temperature range | -25 °C to +85 °C |
The device operates from 2.7 V to 3.6 V supply voltage.
The maximum transmit power is –5 dBm.
It is housed in a 68‑pin thin QFN package measuring 10 mm × 10 mm.
The frequency programming step size of the sigma‑delta fractional‑N PLL is 76 Hz.