Datasheet

LPC178X_7X All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2014. All rights reserved.
Product data sheet Rev. 5 — 9 September 2014 94 of 122
NXP Semiconductors
LPC178x/7x
32-bit ARM Cortex-M3 microcontroller
12. ADC electrical characteristics
[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 28
.
[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 28
.
Table 29. 12-bit ADC characteristics
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
V
IA
analog input voltage 0 - V
DDA
V
12-bit resolution
E
D
differential linearity
error
[2][3][4]
--1LSB
E
L(adj)
integral non-linearity
[2][5]
--6LSB
E
O
offset error
[2][6]
--5LSB
E
G
gain error
[2][7]
--5LSB
E
T
absolute error
[2][8]
--<8LSB
f
clk(ADC)
ADC clock frequency - - 12.4 MHz
f
c(ADC)
ADC conversion
frequency
single conversion
mode
--400kSa
mple
s/s
burst mode - - 375 kSa
mple
s/s
C
ia
analog input
capacitance
--5pF
R
vsi
voltage source
interface resistance
[9]
--1k
8-bit resolution
[10]
E
D
differential linearity
error
[2][3][4]
- 1- LSB
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 - - 36 MHz
f
c(ADC)
ADC conversion
frequency
--1.16Msa
mple/
s
C
ia
analog input
capacitance
--5pF
R
vsi
voltage source
interface resistance
[9]
--1k