LPC1110FD20,529 NXP Semiconductors, LPC1110FD20,529 Datasheet - Page 92
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LPC1110FD20,529
Manufacturer Part Number
LPC1110FD20,529
Description
ARM Microcontrollers - MCU CortexM0 32bit 4KB
Manufacturer
NXP Semiconductors
Datasheet
1.LPC1114FN2810212.pdf
(114 pages)
Specifications of LPC1110FD20,529
Rohs
yes
Core
ARM Cortex M0
Processor Series
LPC1110
Data Bus Width
32 bit
Maximum Clock Frequency
50 MHz
Program Memory Size
4 KB
Data Ram Size
1 KB
On-chip Adc
Yes
Operating Supply Voltage
1.8 V to 3.6 V
Package / Case
SO-20
Mounting Style
SMD/SMT
Factory Pack Quantity
38
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LPC111X
Product data sheet
11.8 ADC effective input impedance
A simplified diagram of the ADC input channels can be used to determine the effective
input impedance seen from an external voltage source. See
The effective input impedance, R
parallel impedance of ((1/f
using
Under nominal operating condition V
frequency fs = 400 kHz, the parameters assume the following values:
The effective input impedance with these parameters is R
Fig 49. ADC input channel
f
C
R
R
C
C
R
R
C
s
ia
mux
sw
io
ia
mux
sw
io
= sampling frequency
= ADC analog input capacitance
= pin capacitance
= 1 pF (max)
= 7.1 pF (max)
Equation 1
= switch resistance
= 1.3 kΩ (max)
= analog mux resistance
= 2 kΩ (max)
COMPARATOR
ADC
All information provided in this document is subject to legal disclaimers.
with
Rev. 8 — 20 February 2013
ADC Block
R
C ia
s
V
in
SS
x C
=
<2 kΩ
R mux
ia
) + R
----------------- -
f
in
s
, seen by the external voltage source, V
1
C
DD
mux
ia
<1.3 kΩ
R sw
LPC1110/11/12/13/14/15
= 3.3 V and with the maximum sampling
+
+ R
R
mux
sw
) and (1/f
+
32-bit ARM Cortex-M0 microcontroller
R
sw
s
----------------- -
f
C io
s
x C
in
1
= 308 kΩ.
C
R in
Figure
io
io
), and can be calculated
R s
49.
Source
© NXP B.V. 2013. All rights reserved.
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