LPC540xx
NXP Semiconductors
32-bit ARM Cortex-M4 microcontroller
[8] The full-scale error voltage or gain error (EG) is the difference between the straight-line fitting the actual
transfer curve after removing offset error, and the straight line which fits the ideal transfer curve. See
Figure 41.
[9] Tamb = 25 C; maximum sampling frequency fs = 5.0 Msamples/s and analog input capacitance Cia = 5 pF.
[10] Input impedance Zi is inversely proportional to the sampling frequency and the total input capacity including
Cia and Cio: Zi 1 / (fs Ci). See Table 20 for Cio. See Figure 42.
offset
error
O
gain
error
E
E
G
4095
4094
4093
4092
4091
4090
(2)
7
code
out
(1)
6
5
4
3
2
1
0
(5)
(4)
(3)
1 LSB
(ideal)
4090 4091 4092 4093 4094 4095 4096
1
2
3
4
5
6
7
V
IA
(LSB
)
ideal
offset error
E
O
VREFP - VREFN
1 LSB =
4096
aaa-016908
(1) Example of an actual transfer curve.
(2) The ideal transfer curve.
(3) Differential linearity error (ED).
(4) Integral non-linearity (EL(adj)).
(5) Center of a step of the actual transfer curve.
Fig 41. 12-bit ADC characteristics
LPC540xx
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© NXP Semiconductors N.V. 2018. All rights reserved.
Product data sheet
Rev. 1.8 — 22 June 2018
139 of 168
NXP [ NXP ]
