XR-2211A Ver la hoja de datos (PDF) - Exar Corporation

Número de pieza

componentes Descripción

Fabricante

XR-2211A

FSK Demodulator/ Tone Decoder

Exar Corporation 

XR-2211A

DESIGN EQUATIONS

(All resistance in W, all frequency in Hz and all capacitance in farads, unless otherwise specified)

(See Figure 3 for definition of components)

1. VCO Center Frequency, fO:

fO

+

1

R0·C0

2. Internal Reference Voltage, VREF (measured at pin 10):

ǒ Ǔ VREF +

VCC

2

–650mV in volts

3. Loop Low-Pass Filter Time Constant, t:

t + C1·RPP (seconds)

where:

ǒ Ǔ RPP +

R1·RF

R1 ) RF

if RF is 1 or CF reactance is 1, then RPP = R1

4. Loop Damping, j:

Ǹǒ Ǔ z +

1250·C0

R1·C1

Note: For derivation/explanation of this equation, please see TAN-011.

5. Loop-tracking

bandwidth,

"+

Df

f0

Df

f0

+

R0

R1

Tracking

Bandwidth

Df

Df

fLL

f1

fO

f2

fLH

Rev. 1.04

8

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