290MHz to 960MHz ASK/FSK Receiver with IC Interface

The MAX41473/MAX41474 are high-performance, low-power receivers ideal for amplitude shift-keyed (ASK) and frequency shift-keyed (FSK) data. The receivers can be configured for three popular sub-1GHz bands while using a single low-cost 16MHz crystal: 287MHz to 320MHz, 425MHz to 480MHz, and 860MHz to 960MHz.

The MAX41473/MAX41474 are capable of ASK or FSK reception, and are also fully programmable through the I2C interface. In addition to the programmable option, the MAX41473/MAX41474 provide a preset option where no programming is required for defined configurations. The design allows for single wire operation to an external microcontroller.

The receiver has excellent RF sensitivity and allows input signals up to 0dBm of power at the RF input. With an integrated IF filter, a few external components, and low operating/power-down currents, the MAX41473/MAX41474 receivers are ideal for cost- and power-sensitive applications. The chips also include a low-noise amplifier (LNA), fully differential image-rejection mixer, on-chip phase-locked loop (PLL) with integrated voltage-controlled oscillator (VCO), received signal strength indicator (RSSI), and digital demodulation.

The devices operate in the 1.8V to 3.6V supply voltage range and also feature a power-saving, fully programmable, self-polling (duty cycling) mode with preamble detection and interrupt output to wake up an external microcontroller unit (MCU).

The parts are available in a 12-pin thin QFN (TQFN) package and are specified for the -40°C to +105°C extended temperature range.

Applications

* Building Access Control * Garage Door Openers (GDO) * Home Automation and Security * Remote Keyless Entry (RKE) * Restaurant Pagers * Tire Pressure Monitoring Systems (TPMS)

* Low Bill of Materials (BOM)

* No External Balun, No External Filter, etc. * Single Low-Cost 16MHz External Crystal

* Long Range with High Sensitivity * Low Power Consumption

* ​9mA Operating Supply Current * 10nA Power-Down Current

* Self-Polling (Remote Wake-Up) for Reduced Power

* Preamble Detection with Interrupt Output * Average Current as Low as 350μA * Duty Cycle Less Than 1% Capable * Fast Startup Time

* Automatic Gain Control (AGC) Adjusted Digital RSSI * Automatic Frequency Control (AFC) * Fast Frequency Switching Frac-N Synthesizer * 33dB Calibrated Image Rejection * Passes ETSI Category 2 Blocking Requirements * ±2.5kV HBM ESD Protection, ±4kV on LNA Input * Up to 200kbps Data Rate (NRZ) * 1.8V to 3.6V Supply Voltage * -40°C to +105°C Operating Temperature Range * 4mm x 4mm, 12-TQFN with 0.8mm Pitch