LPC2131 datasheet(32/45 Pages) PHILIPS

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LPC2131_32_34_36_38

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Product data sheet

Rev. 5.1 — 29 July 2011

32 of 45

NXP Semiconductors

LPC2131/32/34/36/38

Single-chip 16/32-bit microcontrollers

10. ADC electrical characteristics

[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 11.

[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 11.

[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 11.

[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 11.

[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 11.

[8]

See Figure 11.

Table 8.

ADC static characteristics

VDDA = 2.5 V to 3.6 V; Tamb = 40 C to +85 C unless otherwise specified; ADC frequency 4.5 MHz.

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VIA

analog input voltage

VDDA

Cia

analog input capacitance

differential linearity error

[1][2][3] --

1LSB

EL(adj)

integral non-linearity

[1][4] --

2LSB

offset error

[1][5] --

3LSB

gain error

[1][6] --

0.5

absolute error

[1][7] --

4LSB

Rvsi

voltage source interface

resistance

[8] --40

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