FSK Demodulator/Tone Decoder


  • Wide Frequency Range, 0.01Hz to 300kHz
  • Wide Supply Voltage Range, 4.5V to 20V
  • HCMOS/TTL/Logic Compatibility
  • FSK Demodulation, with Carrier Detection
  • Wide Dynamic Range, 10mV to 3V rms
  • Adjustable Tracking Range (+1% to 80%)
  • Excellent Temp. Stability, 100 ppm/°C, typ.
  • Pb-Free, RoHS Compliant Versions Offered

  • Caller Identification Delivery
  • FSK Demodulation
  • Data Synchronization
  • Tone Decoding
  • FM Detection
  • Carrier Detection

The XR2211A is a monolithic phase-locked loop (PLL) system especially designed for data communications applications. It is particularly suited for FSK modem applications. It operates over a wide supply voltage range of 4.5 to 20V and a wide frequency range of 0.01Hz to 300KHz. It can accommodate analog signals between 10mV and 3V, and can interface with conventional DTL, TTL and ECL logic families.

The circuit consists of a basic PLL for tracking an input signal within the pass band, a uadrature phase detector which provides carrier detection, and an FSK voltage comparator which provides FSK demodulation. External components are used to independently set center frequency, bandwidth and output delay. An internal voltage reference proportional to the power supply is provided at an output pin.

The XR2211A is available in 14 pin packages specified for commercial temperature ranges.

Part NumberPkg CodeRoHSMin
StatusBuy NowOrder Samples

Part Status Legend
Active - the part is released for sale, standard product.
EOL (End of Life) - the part is no longer being manufactured, there may or may not be inventory still in stock.
CF (Contact Factory) - the part is still active but customers should check with the factory for availability. Longer lead-times may apply.
PRE (Pre-introduction) - the part has not been introduced or the part number is an early version available for sample only.
OBS (Obsolete) - the part is no longer being manufactured and may not be ordered.
NRND (Not Recommended for New Designs) - the part is not recommended for new designs.