74HCT9046AD NXP Semiconductors, 74HCT9046AD Datasheet - Page 35

• 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
74HCT9046A_6
Product data sheet
Rewriting the equation for natural frequency results in:
The maximum overshoot occurs at N
When C2 = 470 nF, it follows:
Hence the current source bias resistance
With
For extra ripple suppression a capacitor C3 can be connected in parallel with R4, with an
extra
For stability reasons
R3‘
R
R4
1
1
2
bias
n
=
=
=
=
=
=
K
-------------------------------- -
0.4 2.24 10
-------------------------------------- -
-------------------------
0.5 5000
=
5
-- -
------ -
C2
t
3
= 0.707 (0.5
------ -
C2
p
2
5000
0.707
= R4
17 2550
=
1
=
K
------------ -
0.001
=
n
v
2
5
------------------------- -
470 10
2
------------------------- -
470 10
0.00028
C3.
K
0.0012
30
=
=
n
=
0.00028
6
5 10
43 k
Rev. 06 — 15 September 2009
9 –
=
3
9 –
2
should be < 0.1
=
0.0012
=
3
600
r s
2550
n
) it follows:
max
2
= 30; hence K
, hence C3 < 0.1C2 or C3 = 39 nF.
PLL with band gap controlled VCO
n
=
1
30:
74HCT9046A
© NXP B.V. 2009. All rights reserved.
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