NJM2211M データシートの表示（PDF） - Japan Radio Corporation

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コンポーネント説明

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NJM2211M

FSK DEMODULATOR / TONE DECODER

Japan Radio Corporation  

NJM2211

■ DESIGN EQUATIONS

See Figure 1 for Definitions of Components.

1. VCO Center Frequency, f0 :

f0

(Hz)

=

1

R0C0

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

VR

=

 + VS

2





−

650mV

3. Loop Lowpass Filter Time Constant, τ :

τ=R1C1

4. Loop Damping, ξ :

ξ

=





C0

C1









1 

4

5. Loop Tracking Bandwidth, ±∆f/f0 :

∆f/f0 =R0 / R1

6. FSK Date Filter Time Constant, τF :

τF=RFCF

7. Loop Phase Detector Conversion Gain, Kφ :

(Kφ is the differential DC voltage across pins 10 and 11, per unit of phase error at phase-detector input) :

Kφ

(in

volts

per

radian)

=

(−

2)(VREF

π

)

8. VCO conversion Gain, K0, is the amount of change in VCO frequency per unit of DC voltage change at pin 11 :

K0

(in Hertz

per

volt)

=

−1

C0R1VREF

9. Total Loop Gain Kτ :

KT (in radians per second per volt =2πKφK0

=4 / C0R1

10. Peak Phase-Detector Current, IA :

IA (mA)

=

VREF

25

-6-

Ver.2003-12-09

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