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XR-2211P

FSK Demodulator Tone Decoder

Exar Corporation 

XR-2211

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ ÎÎÎÎÎÎÎÎÎÎÎÎ φ Det

Loop

Filter

Data

Filter

FSK

Output

FSK

Comp

ÎÎÎÎÎÎ Input φ ÎÎÎÎVCOÎÎ

Preamp

ÎÎÎÎÎÎφφDeÎÎÎt ÎÎÎÎÎÎÎÎÎ

Lock Detect

Filter

ÎÎ Lock Detect

ÎÎÎÎÎ Outputs

Lock Detect

Comp

Figure 2. Functional Block Diagram of a Tone and FSK

Decoding System Using XR-2211

Input

Signal

2

0.1mF

Loop

11

RF

Phase

Detect

C1

14

Quad

Phase

Detect

12

VCO

13

C0

3

R1

0.1mF

R0

RD

CD

VCC

RB

Rl

8

7

+

CF

FSK

Comp.

10

Internal

Reference

6

+

Lock 5

Detect

Comp.

LDOQ

LDOQN

Rev. 3.01

Figure 3. Generalized Circuit Connection for

FSK and Tone Detection

7

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