The MAX7044 is a crystal-referenced phase-locked loop (PLL) VHF/UHF transmitter designed to transmit OOK/ASK data in the 300MHz to 450MHz frequency range. It supports data rates up to 100kbps, and provides output power up to +13dBm into a 50Ω load while only drawing 7.7mA at 2.7V. The MAX7044's crystal-based architecture eliminates many of the common problems with SAW-based transmitters by providing greater modulation depth, faster frequency settling, higher tolerance of the transmit frequency, and reduced temperature dependence. The MAX7044 also features a low supply voltage of +2.1V to +3.6V. These improvements enable better overall receiver performance when using the MAX7044 together with a superheterodyne receiver such as the MAX1470 or MAX1473. A simple, single-input data interface and a buffered clock-out signal at 1/16th the crystal frequency make the MAX7044 compatible with almost any microcontroller or code-hopping generator. The MAX7044 is available in an 8-pin SOT23 package and is specified over the -40°C to +125°C automotive temperature range.
The MAX7044 is a highly integrated ASK transmitter designed for 300 MHz to 450 MHz operation. It provides up to +13 dBm output power into a 50 Ω load while drawing only 7.7 mA typical supply current at 2.7 V. The device uses a crystal‑based PLL, a low‑voltage supply (2.1 V‑3.6 V), and includes a buffered clock output for easy MCU interfacing.
The datasheet includes electrical characteristics, pin descriptions, typical application circuits, layout guidelines, and package information for the 8‑pin SOT‑23 package. It also lists automotive temperature range, ordering details, and revision history.
| Supply Voltage | 2.1 V – 3.6 V |
|---|---|
| Output Power (PA On) | +13 dBm |
| Data Rate | up to 100 kbps |
| Typical Supply Current | 7.7 mA |
| Frequency Range | 300 MHz – 450 MHz |
| Operating Temperature Range | -40 °C – +125 °C |
| Package | 8‑pin SOT‑23 |
It operates from 2.1 V to 3.6 V single‑supply.
The transmitter can deliver up to +13 dBm into a 50 Ω load.
Typical supply current is 7.7 mA at 2.7 V.
It is packaged in an 8‑pin SOT‑23 package.