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Maxim superhet receiver offers -114dBm sensitivity

Posted: 06 Feb 2003 ?? ?Print Version ?Bookmark and Share

Keywords:maxim integrated products? max1473? superheterodyne receiver? superhet receiver? ask receiver?

The MAX1473 300MHz to 450MHz superheterodyne ASK receiver from Maxim Integrated Products Inc. features -114dBm sensitivity, >50dB user-selectable center frequency image rejection, and the option of running from either a 3V or 5V supply.

The device also includes a one-step AGC circuit that drops the LNA gain by 35dB when the RF input signal is >-57dBm. It also uses a 10.7MHz IF filter with received signal strength indicator and has an on-chip PLL with VCO and analog baseband data recovery circuitry.

Packaged in a 28-pin SSOP, the MAX1473 operates in a wide variety of power-sensitive applications such as remote-keyless entry systems, car alarms, home security systems, remote controls, and garage-door openers.

The device draws <1.5?A in shutdown mode and 5.2mA in receive mode. The center frequency of the fully differential image-rejection mixer can be selected by the user at 315MHz, 375MHz, or 433MHz. Depending on the components selected, the MAX1473 can receive data rates up to 100Kbps and transitions from shutdown to valid data out in <250?s.

The on-chip PLL contains phase detector, charge pump/integrated loop filter, VCO, asynchronous 32x or 64x clock divider, and crystal oscillator, eliminating the need for external components. For an input RF frequency of 315MHz, the quadrature VCO is centered at the nominal LO frequency of 304.3MHz. A reference frequency of 9.5194MHz or 4.7547MHz is needed for a 10.7MHz IF frequency.

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