LPC1785 datasheet(96/117 Pages) NXP

96 / 117 page

LPC178X_7X

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Objective data sheet

Rev. 2 — 27 May 2011

96 of 117

NXP Semiconductors

LPC178x/7x

32-bit ARM Cortex-M3 microcontroller

[1]

Conditions: VSSA =0V, VDDA =3.3 V.

[2]

The ADC is monotonic, there are no missing codes.

[3]

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

See Figure 31.

[4]

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 31.

[5]

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 31.

[6]

The gain error (EG) is the relative difference in percent 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 31.

[7]

The absolute error (ET) is the maximum difference between the center of the steps of the actual transfer

curve of the non-calibrated ADC and the ideal transfer curve. See Figure 31.

[8]

See Figure 32.

[9]

8-bit resolution is achieved by ignoring the lower four bits of the ADC conversion result.

fc(ADC)

ADC conversion

frequency

--400

kHz

8-bit resolution[9]; 1.16 MSamples/sec

differential linearity

error

[1][2][3] -

1-

LSB

EL(adj)

integral non-linearity

[1][4] -

1-

LSB

offset error

[1][5] -

1-

LSB

gain error

[1][6] -

1-

LSB

absolute error

[1][7] --<tbd>

LSB

fclk(ADC)

ADC clock frequency

MHz

fc(ADC)

ADC conversion

frequency

--1.16

MHz

Table 29.

ADC characteristics …continued

VDDA = 2.7 V to 3.6 V; Tamb =25 C.

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

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