74HCT9046AD NXP Semiconductors, 74HCT9046AD Datasheet - Page 29

• Manufacturer Part Number: 74HCT9046AD
• Description: Phase Locked Loops (PLL) PHASE LOCKED LOOP W/VCO
• Manufacturer: NXP Semiconductors
• Type: PLLr

Specifications of 74HCT9046AD

• Number Of Circuits: 1
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 4.5 V
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Operating Supply Voltage: 5 V
• Package / Case: SOIC-16
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 74HCT9046AD,112

NXP Semiconductors
Table 9.
Table 10.
74HCT9046A_6
Product data sheet
Phase
comparator
PC1
PC2
Subject
PLL locks on harmonics at
center frequency
Noise rejection at signal input
AC ripple content when PLL is
locked
Transfer functions of phase comparators and filters
General design considerations
13.1 Filter design considerations for PC1 and PC2 of the 74HCT9046A
Explanation
A = 10
amplitude
R3' = R
R
K
K
1
2
3
1
2
3
bias
PC1
PC
= R3
= R4
= R4
= R3’
= R4
= R4
+
= 25 k to 250 k
=
Figure 30
comparators of the 74HCT9046A. Transfer functions of phase comparators and filters are
given in
5
----- -V /r
4
5
bias
= DC gain
V
---------- - V /r
C2;
C2;
C3;
C2;
C3;
C2;
CC
/17;
Phase comparator
PC1
PC2
PC1
PC2
PC1
PC2
Table
shows some examples of passive and active filters to be used with the phase
9.
Figure
Figure
Figure
Figure
Figure
Figure
Rev. 06 — 15 September 2009
30a
30b
30c
30d
30e
Filter type
passive filter without
damping
passive filter with
damping
active filter with
damping
passive filter with
damping
active filter with
damping
Design consideration
yes
no
high
low
f
f
r
r
= 2f
= f
i
; small ripple content at
i
; large ripple content at
PLL with band gap controlled VCO
Transfer function
A = 10
A = 10
F
F
F
F
F
j
j
j
j
j
=
=
=
=
=
5
5
PC_IN
PC_IN
= DC gain amplitude
= DC gain amplitude
---------------------
1
------------------------------------- -
1
--------------------------- -
1/ A
---------------------------- -
1 A
--------------------------- -
1/ A
74HCT9046A
1
1
1
+
+
+
+
1
+
1
= 0
j
j
+
+
= 90
+
+
j
j
j
j
j
j
j
1
1
2
2
2
+
1
1
1
2
© NXP B.V. 2009. All rights reserved.
2
1
---------------------
1
---------------------
1
---------------------
+
+
j
j
+
j
j
j
j
1
1
1
2
2
2
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