LPC540xx
NXP Semiconductors
32-bit ARM Cortex-M4 microcontroller
11.5 USB PLL (PLL1)
Table 30. PLL1 lock times and current
amb = 40 C to +105 C, unless otherwise specified. VDD = 1.71 V to 3.6 V
T
Symbol Parameter Conditions
PLL1 configuration: input frequency 12 MHz; output frequency 48 MHz
Min
Typ Max
Unit
[1]
tlock(PLL1)
IDD(PLL1)
PLL1 lock time
PLL1 current
-
-
7.4
-
-
s
[1][2]
When locked
260
A
[1] Data based on characterization results, not tested in production.
[2] PLL current measured using lowest CCO frequency to obtain the desired output frequency.
Table 31. Dynamic characteristics of the PLL1[1]
Symbol
Parameter
Conditions
Min
Typ Max
Unit
Reference clock input
Fin
input frequency
1
-
25
MHz
Clock output
[2]
fo
output frequency
for PLL1 clkout
output
9.75
45
-
-
-
160
55
MHz
%
do
output duty cycle
CCO frequency
for PLL1 clkout
output
fCCO
156
320
MHz
Dynamic parameters at fout = fCCO = 320 MHz; standard bandwidth settings
[3][4]
Jpp-period
peak-to-peak, period fref = 4 MHz
jitter
-
-
300
ps
[1] Data based on simulation, not tested in production.
[2] Excluding under- and overshoot which may occur when the PLL is not in lock.
[3] Actual jitter dependent on amplitude and spectrum of substrate noise.
[4] Input clock coming from a crystal oscillator with less than 250 ps peak-to-peak period jitter.
11.6 Audio PLL (PLL2)
Table 32. PLL2 lock times and current
Tamb = 40 C to +105 C, unless otherwise specified. VDD = 1.71 V to 3.6 V
Symbol
Parameter
Conditions
Min Typ Max
Unit
PLL2 configuration: input frequency 12 MHz; output frequency 100 MHz
[1]
tlock(PLL2)
IDD(PLL2)
PLL2 lock time
PLL2 current
-
-
-
-
96
s
[1][2]
when locked
2.0
mA
PLL2 configuration: input frequency 12 MHz; output frequency 100 MHz
[1]
tlock(PLL2)
IDD(PLL2)
PLL2 lock time
PLL2 current
-
-
-
-
108
1.6
s
[1][2]
when locked
mA
[1] Data based on characterization results, not tested in production.
[2] PLL current measured using lowest CCO frequency to obtain the desired output frequency.
LPC540xx
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© NXP Semiconductors N.V. 2018. All rights reserved.
Product data sheet
Rev. 1.8 — 22 June 2018
114 of 168
NXP [ NXP ]
