Datasheet

LPC4370 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2013. All rights reserved.
Product data sheet Rev. 2 — 21 October 2013 138 of 150
NXP Semiconductors
LPC4370
32-bit ARM Cortex-M4/M0 microcontroller
13.8.3 Non-inverting single-ended circuit for input 0 V to 3.3 V
The advantage of having a non-inverting circuit comes at the cost of adding an additional
op-amp for a high-impedance voltage reference to prevent the reference level being
influenced by the input signal. This circuit is recommended for an input voltage from 0 V to
3.3 V using the internal negative reference voltage.
(4)
(5)
Fig 48. Non-inverting single-ended circuit for input 0 V to 3.3 V for 12-bit ADCHS input
Vout Vcom
R1
R1 R2+
--------------------
=
Vcom 1.24 V
R3
R3 R4+
--------------------
=
0 V - 3.3 V
100 mV - 900 mV
V
com
Vin_pos
V
out
5 V
R2
R1
R3
R4
to ADCHS_n
1.24 V
aaa-009657