Low-power 300-450-MHz ASK receiver covers the automotive temperature range

Sunnyvale, CA — The latest MAX7034 low-power superheterodyne receiver for ASK data from Maxim Integrated Products covers the 300 MHz to 450 MHz frequency range. Only requiring a few external components to implement a complete receive-chain solution, this device integrates an LNA, image-rejection mixer, self-contained PLL block, 10.7 MHz IF filter with RSSI, and analog, baseband data-recovery circuitry. To ensure excellent receive sensitivity in automotive and consumer applications, these critical blocks have been designed to withstand high temperatures.

Providing high, -114 dBm sensitivity and 44 dB of image rejection, the MAX7034 is ideal for applications such as remote keyless-entry systems, car alarms, home security systems, remote controls, and garage door openers.

The architecture of this ASK receiver greatly simplifies implementation in any 300 MHz to 450 MHz RF system. The input impedance of the LNA can be adjusted by varying the off-chip degeneration inductor, allowing it to accommodate a wide range of antenna designs. To further enhance flexibility, the center frequency of the fully-differential, image-rejection mixer can be set to 315 MHz, 375 MHz, or 433 MHz. Additionally, the integration of image rejection eliminates the need for an external SAW filter in many applications, thus increasing sensitivity, simplifying the antenna-matching network, saving board space, and reducing cost.

The MAX7034 operates from a single 5-V supply, and draws less than 3.0 µA in shutdown mode and only 6.7 mA in receive mode. Fully specified over the -40 degrees Celsius to +125 degrees Celsius automotive temperature range, it is available in a 28-pin TSSOP package.

A datasheet is available.

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