Datasheet
LPC408X_7X All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2014. All rights reserved.
Product data sheet Rev. 3.1 — 1 September 2014 105 of 138
NXP Semiconductors
LPC408x/7x
32-bit ARM Cortex-M4 microcontroller
[1] V
DDA
and VREFP should be tied to V
DD(3V3)
if the ADC and DAC are not used.
[2] Conditions: V
SSA
=0V, V
DDA
=3.3V.
[3] The ADC is monotonic, there are no missing codes.
[4] The differential linearity error (E
D
) is the difference between the actual step width and the ideal step width.
See Figure 32
.
[5] 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 32
.
[6] 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 32
.
[7] 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 32
.
[8] 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 32
.
[9] In single-conversion mode.
[10] See Figure 33
.
[11] 8-bit resolution is achieved by ignoring the lower four bits of the ADC conversion result.
E
L(adj)
integral
non-linearity
[2][5]
- 1- LSB
E
O
offset error
[2][6]
- 1- LSB
E
G
gain error
[2][7]
- 1- LSB
E
T
absolute error
[2][8]
--<1.5 LSB
f
clk(ADC)
ADC clock
frequency
--36MHz
f
c(ADC)
ADC conversion
frequency
[9]
- - 1.16 MSamples/s
C
ia
analog input
capacitance
--5pF
R
vsi
voltage source
interface resistance
[10]
--1k
Table 28. 12-bit ADC characteristics
…continued
V
DDA
= 2.7 V to 3.6 V; T
amb
=
40
C to +85
C unless otherwise specified.
[1]
Symbol Parameter Conditions Min Typ Max Unit