LPC4370 datasheet(136/150 Pages) NXP

Part #	LPC4370

Description	32-bit ARM Cortex-M4 2 x M0 MCU 282 kB SRAM Ethernet two HS USBs 80 Msps 12-bit ADC configurable peripherals

PDF	150 Pages

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Manufacturer	NXP [NXP Semiconductors]

Direct Link	http://www.nxp.com

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136 / 150 page

LPC4370

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Product data sheet

Rev. 2 — 21 October 2013

136 of 150

NXP Semiconductors

LPC4370

32-bit ARM Cortex-M4/M0 microcontroller

13.8.1 Inverting single-ended circuit

For the inverting single-ended circuit only one op-amp is needed. A 1.24 V shunt voltage

reference is used for creating an offset voltage of 450 mV. The disadvantage is that the

signal output of the circuit is inverted. However, this can be easily solved in software by

subtracting the ADC output from 4095, which is the maximum value of the 12-bit result.

(2)

Fig 46. Inverting single-ended circuit for 12-bit ADCHS input

Vout

Vcom

--------------------

-------







Vin_pos

-------

–

100 mV - 900 mV

Vcom

Vout

5 V

1.24 V

Vin_pos

0 V - 800 mV (R1 = R2)

0 V - 3.3 V (R1 = 10 x R2)

to ADCHS_n

aaa-009655

LPC4370 Datasheet(PDF) 136 Page - NXP Semiconductors