RFHCS362F datasheet(30/54 Pages) MICROCHIP

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rfHCS362G/362F

DS41189B-page 30

FIGURE 6-4:

EXAMPLE LOOP FILTER

CIRCUIT

TABLE 6-4:

EXAMPLE LOOP FILTER VALUES FOR TRANSMIT FREQUENCY = 433.92 MHz (1)

TABLE 6-5:

EXAMPLE LOOP FILTER VALUES FOR TRANSMIT FREQUENCY = 315 MHz (1)

rfHCS362G/362F

Loop BW

Fn (natural

freq in Hz)

Phase Margin

(not counting

sampling delay)

2nd Order

damping

factor

Calculated

Lock Time

0.01 uF

390 pF

680

165 kHz

64 kHz

65 deg

1.37

μs

3900 pF

100 pF

1.5K

360 kHz

103 kHz

63 deg

1.89

μs

1500 pF

47 pF

2.7K

610 kHz

166 kHz

55 deg

2.10

μs

1000 pF

18 pF

4.7K

1.05 MHz

203 kHz

50 deg

3.0

μs

Note 1: Standard Operating Conditions (unless otherwise stated) TA = 25°C, RFEN = 1, VDDRF = 3V.

Loop BW

Fn (natural

freq in Hz)

Phase Margin

(not counting

sampling delay)

2nd Order

damping

factor

Calculated

Lock Time

3900 pF

390 pF

680

190 kHz

112 kHz

55 deg

0.94

μs

3900 pF

680 pF

680

175 kHz

112 kHz

47 deg

0.94

μs

3900 pF

1000 pF

680

155 kHz

112 kHz

39 deg

0.94

μs

Note 1: Standard Operating Conditions (unless otherwise stated) TA = 25°C, RFEN = 1, VDDRF = 3V.

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