PE3282A PEREGRINE [Peregrine Semiconductor Corp.], PE3282A Datasheet - Page 11

• Manufacturer Part Number: PE3282A
• Description: 1.1 GHz/510 MHz Dual Fractional-N PLL IC for Frequency Synthesis
• Manufacturer: PEREGRINE [Peregrine Semiconductor Corp.]

Figure 7. Typical Application Example
Note 1: VCO output assumed to be AC coupled.
Note 2: R1 and R3 are chosen to set the input drive to pins f
delivered to the load and attenuate reflected energy from the PLL inputs.
Note 3: The f
driving the f
Note 4: The unity gain bandwidth is recommended to be less than or equal to 10 percent of the step size.
Document 70/0002~07B
PLL1 (RF)
OUT
Table 11. PLL1 (RF)
Operating
Conditions
f
f
f
Fractionality =
Step Size = 25 kHz
Phase Margin
N = 1,185 + 3/32
(M = 37, A = 1, F = 3)
K
Kpd = 70 µA/2 ¼ rad
out
ref
comp
VCO
n
r
220 pF
r
pin from an external 50 ohm signal source.
input may be DC coupled if driven by an appropriate CMOS level signal. A 50 ohm terminating resistor can be used when
= 14.4 MHz
= 3.0 kHz
= 948.075 MHz
= 13 MHz/V
= 800 kHz
(Note 1)
VCO
=
32
45°
Reference
Input
Output
f
Loop Filter
Values (Note 4)
R2 = 30 k ohm
C2 =.0043 µF
C1 = 900 pF
o
LD
.01 µF
R2
C2
Peregrine Semiconductor Corporation
(Note 2)
220 pF
C1
1000 pF
R1
V
DD
(Note 3)
220 pF
V
DD
220 pF
in
1 and f
Gnd
V
V
CP1
f
f
Gnd
f
Gnd
f
in
in
r
o
.01 µF
DD
DD
LD
1
1
in
2. R1 and R3 also allow a larger proportion of the VCO output to be
.01 µF
Clock
Data
Gnd
CP2
Gnd
V
V
f
f
in
in
DD
LE
DD
2
2
220 pF
V
1000 pF
DD
51K
V
DD
R3
Table 12. PLL2 (IF)
220 pF
(Note 2)
Operating
Conditions
f
f
f
Fractionality =
Step Size = 50 kHz
Phase Margin
N = 163 + 1/16
(M = 10, A = 3, F = 2)
K
Kpd = 70 µA/2 ¼ rad
out
ref
comp
VCO
n
51K
= 14.4 MHZ
= 2.0 kHz
= 130.45 MHz
®
= 5 MHz/V
= 800 kHz
.01 µF
C3
51K
1.1 GHz/510 MHz Dual PLL IC
R4
=
C4
16
45°
Controller
From
Loop Filter
Values (Note 4)
R4 = 7.1 k ohm
C4 =.027 µF
C3 =.0056 µF
(Note 1)
VCO
1000 pF
PLL2 (IF)
OUT