The MAX2021 is a low-noise, high-linearity, direct upconversion/downconversion quadrature modulator/demodulator designed for RFID handheld and portal readers, as well as single and multicarrier 750MHz to 1200MHz GSM/EDGE, cdma2000, WCDMA, and iDEN base-station applications. Direct conversion architectures are advantageous since they significantly reduce transmitter or receiver cost, part count, and power consumption as compared to traditional IF-based double conversion systems. In addition to offering excellent linearity and noise performance, the MAX2021 also yields a high level of component integration. This device includes two matched passive mixers for modulating or demodulating in-phase and quadrature signals, two LO mixer amplifier drivers, and an LO quadrature splitter. On-chip baluns are also integrated to allow for single-ended RF and LO connections. As an added feature, the baseband inputs have been matched to allow for direct interfacing to the transmit DAC, thereby eliminating the need for costly I/Q buffer amplifiers. The MAX2021 operates from a single +5V supply. It is available in a compact 36-pin thin QFN package (6mm x 6mm) with an exposed paddle. Electrical performance is guaranteed over the extended -40°C to +85°C temperature range.
The MAX2021 is a low‑noise, high‑linearity quadrature modulator/demodulator designed for RFID handheld and portal readers, as well as single‑ and multicarrier GSM/EDGE, cdma2000, WCDMA, and iDEN base‑station applications. It operates from a single +5 V supply and is offered in a compact 36‑pin thin QFN package (6 mm × 6 mm) with an exposed paddle.
Key features include integrated passive mixers, LO driver amplifiers, on‑chip baluns, and a DC‑coupled baseband input that allows direct connection to a transmit DAC, eliminating the need for external I/Q buffer amplifiers. The device provides excellent linearity, ACLR, and side‑band suppression across the 750 MHz‑1200 MHz RF band.
| RF Frequency Range | 750 MHz – 1200 MHz |
|---|---|
| Supply Voltage | +5 V (4.75 V – 5.25 V) |
| Output Power (typical) | 0.7 dBm |
| Package | 36‑Pin thin QFN (6 mm × 6 mm) with exposed paddle |
The MAX2021 operates from a single +5 V supply (typical 4.75 V to 5.25 V).
It covers an RF frequency range from 750 MHz to 1200 MHz.
The device is offered in a 36‑pin thin QFN package (6 mm × 6 mm) with an exposed paddle.