LPC2141_42_44_46_48 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2011. All rights reserved.
Product data sheet Rev. 5 — 12 August 2011 32 of 45
NXP Semiconductors
LPC2141/42/44/46/48
Single-chip 16-bit/32-bit microcontrollers
10. ADC electrical characteristics
[1] The ADC is monotonic, there are no missing codes.
[2] The differential linearity error (E
D
) is the difference between the actual step width and the ideal step width. See Figure 8.
[3] The integral non-linearity (E
L(adj)
) is the peak difference between the center of the steps of the actual and the ideal transfer curve after
appropriate adjustment of gain and offset errors. See Figure 8
.
[4] The offset error (E
O
) is the absolute difference between the straight line which fits the actual curve and the straight line which fits the
ideal curve. See Figure 8
.
[5] The gain error (E
G
) is the relative difference in percent 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 8
.
[6] The absolute error (E
T
) is the maximum difference between the center of the steps of the actual transfer curve of the non-calibrated
ADC and the ideal transfer curve. See Figure 8
.
[7] See Figure 9
.
Table 8. ADC static characteristics
V
DDA
= 2.5 V to 3.6 V; T
amb
=
40
C to +85
C unless otherwise specified; ADC frequency 4.5 MHz.
Symbol Parameter Conditions Min Typ Max Unit
V
IA
analog input voltage 0 - V
DDA
V
C
ia
analog input capacitance - - 1 pF
E
D
differential linearity error V
SSA
=0V, V
DDA
=3.3V
[1][2]
--1LSB
E
L(adj)
integral non-linearity V
SSA
=0V, V
DDA
=3.3V
[3]
--2LSB
E
O
offset error V
SSA
=0V, V
DDA
=3.3V
[4]
--3LSB
E
G
gain error V
SSA
=0V, V
DDA
=3.3V
[5]
--0.5 %
E
T
absolute error V
SSA
=0V, V
DDA
=3.3V
[6]
--4LSB
R
vsi
voltage source interface
resistance
[7]
--40 k
