MICRF002YM データシートの表示（PDF） - Micrel

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MICRF002YM

300-440MHz QwikRadio® ASK Receiver

Micrel 

Micrel, Inc.

for the vast majority of applications. If adjustment is

required the constant may be varied by adding a resistor in

parallel with the CAGC capacitor. The value of the resistor

must be determined on a case by case basis.

Step 5: Selecting The Demod Filter Bandwidth

The inputs SEL0 and SEL1 control the demodulator filter

bandwidth in four binary steps (625Hz to 5000Hz in sweep,

1250Hz to 10000Hz in fixed-mode), see Table 3.

Bandwidth must be selected according to the application.

The demodulator bandwidth should be set according to

Equation 8:

MICRF002/RF022

(8) Demoulator bandwidth =

0.65

Shortest pulse − width

It should be noted that the values indicated in Table 1 are

nominal values. The filter bandwidth scales linearly with

frequency so the exact value will depend on the operating

frequency. Refer to the “Electrical Characteristics” for the

exact filter bandwidth at a chosen frequency.

SEL0 SEL1

1

1

0

1

1

0

0

0

Demodulator Bandwidth

Sweep-Mode

Fixed-Mode

5000Hz

10000Hz

2500Hz

5000Hz

1250Hz

2500Hz

625Hz

1250Hz

Table 1. Nominal Demodulator Filter Bandwidth vs.

SEL0, SEL1 and Operating Mode

July 2008

10

M9999-070808

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