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 137 of 150
NXP Semiconductors
LPC4370
32-bit ARM Cortex-M4/M0 microcontroller
13.8.2 Non-inverting single-ended circuit with gain = 1
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
100 mV to 800 mV using the internal negative reference voltage.
(3)
Fig 47. Non-inverting single-ended circuit with gain = 1 for 12-bit ADCHS input
Vout Vin_pos Vcom (for R3 = R4 and R1 = R2)+=
0 V - 800 mV
100 mV - 900 mV
V
com
Vin_pos
V
out
5 V
R4
R3
R1
R7
R6
R5
R2
to ADCHS_n
1.24 V
aaa-009656