The MAX1472 is a crystal-referenced phase-locked loop (PLL) VHF/UHF transmitter designed to transmit OOK/ASK data in the 300MHz to 450MHz frequency range. The MAX1472 supports data rates up to 100kbps, and adjustable output power to more than +10dBm into a 50Ω load. The crystal-based architecture of the MAX1472 eliminates many of the common problems with SAW transmitters by providing greater modulation depth, faster frequency settling, higher tolerance of the transmit frequency, and reduced temperature dependence. Combined, these improvements enable better overall receiver performance when using a superheterodyne receiver such as the MAX1470 or MAX1473. The MAX1472 is available in a 3mm x 3mm 8-pin SOT23 package and is specified for the automotive (-40°C to +125°C) temperature range. An evaluation kit is available. Contact Maxim Integrated Products for more information.
The MAX1472 is a crystal‑referenced phase‑locked loop (PLL) VHF/UHF transmitter designed for 300 MHz to 450 MHz operation. It supports ASK/OOK modulation with data rates up to 100 kbps and delivers adjustable output power exceeding +10 dBm into a 50 Ω load. The device is targeted at remote keyless entry, tire‑pressure monitoring, security systems, wireless toys, game consoles, computer peripherals and sensors.
Key features include single‑supply operation from 2.1 V to 3.6 V, low 5.3 mA typical supply current, fast 220 µs turn‑on time, and a compact 8‑pin SOT‑23 package. The datasheet provides detailed pin descriptions, electrical characteristics, shutdown mode behavior, PLL operation, power‑amplifier design, output‑matching networks, layout guidelines and package information.
| Frequency Range | 300 MHz – 450 MHz |
|---|---|
| Supply Voltage | 2.1 V – 3.6 V |
| Maximum Output Power | > +10 dBm (into 50 Ω) |
| Data Rate | 0 – 100 kbps |
| Modulation Depth | 90 dB |
| Package | 8‑pin SOT‑23 |
| Shutdown Mode Current | < 5 nA |
The MAX1472 operates from 2.1 V up to 3.6 V supply voltage.
It can deliver more than +10 dBm of output power into a 50 Ω load.
When ENABLE is low, the MAX1472 enters shutdown and the supply current falls below 5 nA.