LPC4088 datasheet(95/123 Pages) NXP

95 / 123 page

LPC408X_7X

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Objective data sheet

Rev. 1 — 17 September 2012

95 of 123

NXP Semiconductors

LPC408x/7x

32-bit ARM Cortex-M4 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 29.

[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 29.

[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 29.

[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 29.

[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 29.

[8]

See Figure 30.

[9]

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

Cia

analog input

capacitance

--5

Rvsi

voltage source

interface resistance

[8] --1



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] --<

1.5

LSB

fclk(ADC)

ADC clock frequency

MHz

fc(ADC)

ADC conversion

frequency

--1.16

MHz

Cia

analog input

capacitance

--5

Rvsi

voltage source

interface resistance

[8] --1



Table 27.

12-bit ADC characteristics …continued

VDDA = 2.7 V to 3.6 V; Tamb = 40 C to +85 C unless otherwise specified.

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

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