The XR2211M is a monolithic phase-locked loop (PLL) tone decoder manufactured by Xicor Inc. (later acquired by Intersil and now Renesas). This versatile chip is designed for a variety of tone decoding applications, offering high stability and adjustable bandwidth.

Applications:

• FSK Demodulation: Used in Frequency-Shift Keying (FSK) demodulators for data transmission and reception.
• Tone Decoding: Employed in tone-activated switches and remote control systems.
• Carrier Current Remote Controls: Utilized in systems that transmit control signals over power lines.
• Telemetry Receivers: Applied in telemetry systems to decode data transmitted from remote sensors.
• Burglar Alarms: Can be used to detect specific audio tones as part of an alarm system

Features:

• Wide Operating Voltage Range: Operates from 4.5V to 20V.
• Adjustable Bandwidth: Allows for customization of the detection bandwidth.
• High Stability: Provides reliable performance over a wide range of operating conditions.
• Excellent Temperature Stability: Maintains consistent performance across temperature variations.
• TTL/CMOS Compatible Outputs: Can be easily interfaced with digital logic circuits.

Benefits:

• Versatile Tone Decoding: Suitable for a wide range of applications requiring tone detection.
• Improved System Performance: High stability and adjustable bandwidth enhance system reliability.
• Simplified Circuit Design: Monolithic design reduces the number of external components required.
• Reduced System Costs: Integrated functions and wide operating voltage range minimize overall system costs.
• Enhanced Noise Immunity: Provides reliable detection even in noisy environments.

Additional Details:

The XR2211M requires external resistors and capacitors to set the center frequency, bandwidth, and output delay. The chip includes a voltage-controlled oscillator (VCO), a phase detector, and a loop filter. The datasheet provides detailed formulas and guidelines for selecting external components to achieve the desired performance characteristics. The XR2211M is typically packaged in an 8-pin DIP or SOIC package. Detailed component selection and example circuit designs can be found in the XR2211 datasheet available from Renesas.