LPC802 datasheet(58/83 Pages) NXP

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LPC802

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Product data sheet

Rev. 1.6 — 27 April 2018

58 of 83

NXP Semiconductors

LPC802

32-bit ARM Cortex-M0+ microcontroller

14.2 ADC

[1]

The input resistance of ADC channel 0 is higher than for all other channels. See Figure 30.

[2]

In the ADC TRM register, set VRANGE = 0 (default).

[3]

In the ADC TRM register, set VRANGE = 1 (default).

[4]

Based on characterization. Not tested in production.

[5]

The differential linearity error (ED) is the difference between the actual step width and the ideal step width. See Figure 30.

[6]

The integral non-linearity (EL(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 30.

[7]

The offset error (EO) is the absolute difference between the straight line which fits the actual curve and the straight line which fits the

ideal curve. See Figure 30.

[8]

The full-scale error voltage or gain error (EG) 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 30.

[9]

Tamb = 25 C; maximum sampling frequency fs = 480 Ksamples/s and analog input capacitance Cia = 26 pF.

[10] Input impedance Zi (see Section 14.2.1) is inversely proportional to the sampling frequency and the total input capacity including Cia and

Cio: Zi  1 / (fs  Ci). See Table 12 for Cio.

Table 25.

12-bit ADC static characteristics

Tamb = 40 C to +105 C unless noted otherwise; VDD = 2.5 V to 3.6 V; VREFP = VDD; VREFN = VSS.

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VIA

analog input voltage

VDD

Vref

reference voltage

on pin VREFP

2.5

VDD

Cia

analog input

capacitance

fclk(ADC)

ADC clock frequency

[2] --

MHz

sampling frequency

[2] -

480

Ksamples/s

differential linearity

error

[5][4] -

1-

LSB

EL(adj)

integral non-linearity

[6][4] -

4-

LSB

offset error

[7][4] -

3-

LSB

Verr(fs)

full-scale error voltage

[8][4] -0.1

input impedance

fs = 480 Ksamples/s

[1][9]

[10]

0.1



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