XR2211 FSK Demodulator/Tone Decoder

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The XR-2211 is a monolithic phase-locked loop (PLL)system specially 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 to300kHz. It can accommodate analog signals between10mV 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 passband, a quadrature phase detector that provides carrier detection, and an FSK voltage comparator that 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.

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XR2211 Pinout

XR2211 Pin Configuration

Pin No	Pin Name	Description
1	VCC	Positive Power Supply
2	INP	Receive Analog Input
3	LDF	Lock Detect Filter
4	GND	Ground Pin
5	LDOQN	Lock Detect Output Not Pin
6	LDOQ	Lock Detect Output Pin
7	DO	Data Output Pin
8	COMP 1	FSK Comparator Input Pin
9	NC	No Connection
10	VREF	Internal Voltage Reference Pin
11	LDO	Loop Detect Output Pin
12	TIM R	Timing Resistor Input Pin
13	TIM C2	Timing Capacitor Input Pin
14	TIM C1	Timing Capacitor Input Pin