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Receiver with -110dBm sensitivity for high-volume, low-cost apps

Posted: 07 Jun 2005 ?? ?Print Version ?Bookmark and Share

Keywords:maxim integrated products? maxim? max7042? frequency shift keying receiver? fsk receiver?

maxim integrated products introduced the MAX7042 VHF/UHF phase locked loop (PLL)-based frequency shift keying (FSK) receiver. Housed in a small, 5-by-5mm, 32-pin thin QFN package, this receiver is well suited for low-cost, high-volume applications where range is critical. Typical applications include car-alarm key fobs, RF modules, security products, remote controls, and remote sensors operating at 308MHz, 315MHz, 418MHz, and 433.92MHz.

The receiver achieves better than -110dBm of FSK sensitivity, making an external low-noise amplifier (LNA) unnecessary. The device features an on-chip, 44dB (typical) image rejection (IR) mixer which eliminates the need for SAW filters in many applications. The part operates off 3.3Vdc or 5Vdc supplies and down to 2.4Vdc.

The device integrates all of the active components required in a superheterodyne receiver, including an LNA, an IR mixer, a fully integrated PLL, a local oscillator (LO), a 10.7MHz IF limiting amplifier with receive-signal-strength indicator (RSSI), a low-noise FM demodulator, and a 3V regulator. A differential peak detecting data demodulator is also included for analog base band, data-recovery circuitry.

The receiver draws approximately 20nA in shutdown mode and only 6.4mA in receive mode. Depending on the components selected, it can receive up to 66kbps data rates (NRZ) and transitions from shutdown to valid data out in less than 250?s.

It operates over the automotive temperature range (-40C to 125C). The MAX7042 is priced at $1.65 (10,000-up, FOB USA). Evaluation kits are available.

- Janine Love


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