300 to 450 MHz transmitter claimed to be world's smallest
2 July 2003Telecoms, Datacoms, Wireless, IoT
Products & Solutions
Claimed to be the world's smallest VHF/UHF PLL-based ASK transmitter, the MAX1472 is housed in a tiny 3 x 3 mm 8-pin SOT23 package. The transmitter is targeted at low-cost, high-volume applications where space is critical such as key fobs, security products, garage-door openers, and remote sensors operating in the 300 to 450 MHz band. Maxim's MAX1472 is designed to run directly from a lithium cell as it operates down to 2,1 V, consuming only 100 nA of current in standby mode. During transmission, it can output from -10 to +10 dBm of power into a 50 Ω load. For a +10 dBm power level, the MAX1472 consumes 5,5 mA of current at 315 MHz when using a 50% duty-cycle encoding scheme, such as Manchester. Current consumption drops to 3 mA at 0 dBm output. It can accept data rates up to 100 Kbps.
Since the part is targeted at small, portable applications, the MAX1472 is designed to accept crystal frequencies between 9 to 15 MHz which are widely available in inexpensive, surface-mount packages. Once the device's enable pin is activated, it takes only 250 µs for the device's PLL and crystal to settle, so the device is available to transmit.
Using a crystal-based PLL also means that most of the problems of an LC- or SAW-based transmitter are eliminated. The inherent accuracy of the crystal frequency allows for a narrower IF bandwidth in the receiver to improve system sensitivity. With a receiver like Maxim's MAX1470 or MAX1473, 9 dB improvement in sensitivity is possible by narrowing the IF bandwidth from 600 to 50 kHz. Improved sensitivity translates directly to greater range or more reliable transmissions for the product.
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