The MAX7044 crystal-referenced phase-locked-loop (PLL) VHF/UHF transmitter is designed to transmit OOK/ASK data in the 300MHz to 450MHz frequency range. The MAX7044 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 crystal-based architecture of the MAX7044 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 the 300MHz to 450MHz frequency range. It utilizes a crystal-based architecture to provide greater modulation depth, faster frequency settling, and reduced temperature dependence compared to SAW-based transmitters.
The device features a low supply voltage operation from +2.1V to +3.6V and draws only 7.7mA typical operating current at 2.7V. It includes an automatic shutdown mode that places the device in low-power mode if the data input has not toggled for a specific wait time.
| Frequency Range | 300MHz to 450MHz |
|---|---|
| Data Rate | Up to 100kbps |
| Output Power | +13dBm into 50Ω load |
| Supply Voltage | +2.1V to +3.6V |
| Operating Supply Current (Typ) | 7.7mA at 2.7V, PA off |
| Package Type | 8-pin SOT23 |
The fast-on oscillator has a startup time of 250 microseconds.
Yes, it enables better overall receiver performance when used together with a superheterodyne receiver such as the MAX1470 or MAX1473.