Datasheet
LPC15XX All information provided in this document is subject to legal disclaimers. © NXP B.V. 2014. All rights reserved.
Product data sheet Rev. 1 — 19 February 2014 77 of 99
NXP Semiconductors
LPC15xx
32-bit ARM Cortex-M3 microcontroller
[1] The input resistance of ADC channel 0 is higher than for all other channels.
[2] The differential linearity error (E
D
) is the difference between the actual step width and the ideal step width.
See Figure 40
.
[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 40
.
[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 40
.
[5] The full-scale error voltage or gain error (E
G
) 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 40
.
[6] T
amb
= 25 C; maximum sampling frequency f
s
= 2 Msamples/s and analog input capacitance C
ia
= 0.1 pF.
[7] Input impedance Z
i
is inversely proportional to the sampling frequency and the total input capacity including
C
ia
and C
io
: Z
i
1 / (f
s
C
i
). See Table 11 for C
io
.
Table 24. 12-bit ADC static characteristics
T
amb
=
40
C to +105
C; V
DD
= 2.4 V to 3.6 V; VREFP = V
DDA
; V
SSA
= 0; VREFN = V
SSA
.
Symbol Parameter Conditions Min Max Unit
V
IA
analog input voltage
[1]
0V
DDA
V
C
ia
analog input
capacitance
-0.32pF
f
clk(ADC)
ADC clock frequency V
DDA
2.7 V 50 MHz
V
DDA
2.4 V 25 MHz
f
s
sampling frequency V
DDA
2.7 V - 2 Msamples/s
V
DDA
2.4 V - 1 Msamples/s
E
D
differential linearity
error
[2]
-+/- 2LSB
E
L(adj)
integral non-linearity
[3]
-+/- 2LSB
E
O
offset error
[4]
-+/- 3LSB
V
err(fs)
full-scale error voltage 2 Msamples/s
[5]
- +/- 0.12 %
1 Msamples/s +/- 0.07 %
Z
i
input impedance f
s
= 2 Msamples/s
[6][7]
0.1 - M
Fig 39. ADC input impedance
DAC
ADC
R
sw
= 5 Ω...25 Ω
R
1
= 0.25 kΩ...2.5 kΩ
C
ia
C
DAC
ADCn_0
ADCn_[1:11]
aaa-011748
C
io
C
io