RFPIC12C509AG Datasheet, PDF (40/104 Pages) Microchip Technology – 18/20-Pin 8-Bit CMOS Microcontroller with UHF ASK/FSK Transmitter

rfPIC12C509AG/509AF
FIGURE 7-5: EXAMPLE LOOP FILTER
CIRCUIT
rfPIC12C509AG
LF
R1
C2
C1
TABLE 7-4: EXAMPLE LOOP FILTER VALUES ⁽¹⁾
C1
C2
R1
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
3900 pF 100 pF 1.5K 360 kHz
103 kHz
63 deg
1.89
1500 pF 47 pF
2.7K 610 kHz
166 kHz
55 deg
2.10
1000 pF 18 pF
4.7K 1.05 MHz
203 kHz
50 deg
3.0
Note 1: Standard Operating Conditions (unless otherwise stated) TA = 25°C, RFEN = 1, VDDRF = 3V,
fTRANSMIT = 433.92 MHz
51 µS
16 µS
10 µS
8 µS
DS70031A-page 38
Preliminary
© 2001 Microchip Technology Inc.