MC145181 Datasheet, PDF (39/71 Pages) Motorola, Inc – Dual 550/60 MHz PLL Frequency Synthesizer with DACs and Voltage Multiplier

Freescale S_Me_Cm₁₄i₅c₁o₈n₁ ductor, Inc.
Figure 38. Charge Pump Model
If [V(In1)>=1 j V(In2)<1, 1 x 10–3, 0]
R_φ
In1
V_φ
In2
0
PDout
idrive
Parameters:
tw
fc
k1
6.283
250 x 106
525 x 106
Parameters:
N 5000
Qc 1 x 10–6
ctrl
If [V(In2)>=1 j V(In1)<1, 1 x 10–3, 0]
0
If [V(idrive) > 0, 0, 1]
S1
++
––
Sbreak
If [V(idrive) < 5, 0, 1]
0
0
S2
++
––
Sbreak
0
+ V1
5
–
0
Figure 39. VCO Behavioral Model
1
VCOout
sin {tw [fc time + N v(int)]}
E1
In+
Out+
In–
Out–
evalue
sin ^ƪ tw
fc
N
time + v(int)^Æ«
5V
1 x 103
Out
0V
G1
ctrl
In+
In–
gvalue
k1
tw N ^{v(ctrl) Qc}
0
+ _{IC = 0}
int
C1
1 x 10–6
R1 1 x 1099
MOTOROLA RF/IF DEVICE DATA For More Information On This Product,
39
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