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RF transceivers handle 470-510MHz short-range apps

Posted: 22 Mar 2010 ?? ?Print Version ?Bookmark and Share

Keywords:RF transceiver? short-range? power amplifier? LNA?

MICRF507 RF transceiver

Micrel Inc. has released the latest member of its family of low-cost, low-power, 410 to 950MHz FSK RF transceivers. The MICRF507 is specifically targeted at the growing market of Automated Meter Reading (AMR) applications that utilize the 470MHz to 510MHz Short-Range Device Communications (SRD) band in China.

The device supports data rates up to 200Kbit/s and achieves a sensitivity of -113dBm at 2.4Kbit/s, while only consuming 12mA of supply current from a 2.5V supply. An integrated power amplifier (PA) delivers +10dBm of output power while only consuming 21.5mA of supply current.

"The MICRF507 is ideally suited to the growing AMR market in China," noted Doyle Slack, director of mixed-signal and RF products, Micrel. "The device consumes just 12mA of supply current from a 2.5V supply and offers an integrated +10dBm power amplifier and transmit/receive switch."

The receiver of the MICRF507 utilizes a Zero IF I/Q architecture, integrating a LNA with bypass mode, I/Q quadrature mixers, three-pole Sallen-Key IF pre-filters, and six-pole elliptic switched capacitor IF filters, providing excellent selectivity, adjacent channel rejection and blocking performance. FSK demodulation is implemented digitally and a synchronizer recovers the received bit clock. A received signal strength indicator indicates the received signal level over a 50dB range. An integrated Frequency Error Estimator and crystal tuning capability allow fine tuning of the RF. The transmitter of the MICRF507 consists of an FSK modulator and power amplifier with output power adjustable from +10dBm to -3.5dBm in seven steps. The device also features a low power down supply current of 0.2?A while retaining register information and a low 280?A in standby mode where only the crystal oscillator is enabled. The MICRF507 requires a 2V to 2.5V supply voltage, operates over the -40C to +85C temperature range, and is available in a 32-pin MLF package.

The MICRF507 is currently available in volume quantities with pricing starting at $1.95 for 1K.





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