LPC2921 datasheet(58/83 Pages) NXP

58 / 83 page

LPC2921_23_25_1

Preliminary data sheet

Rev. 01 — 15 June 2009

58 of 83

NXP Semiconductors

LPC2921/2923/2925

ARM9 microcontroller with CAN, LIN, and USB

[1]

Conditions: VSS(IO) =0V, VDDA(ADC3V3) = 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 14.

[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 14.

[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 14.

[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 14.

[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 14.

[8]

See Figure 13.

Table 32.

ADC static characteristics

VDDA(ADC3V3) = 3.0 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

VVREFN

voltage on pin VREFN

VVREFP − 2V

VVREFP

voltage on pin VREFP

VVREFN +2 -

VDDA(ADC3V3)

VIA

analog input voltage

VVREFN

-VVREFP

input impedance

between VVREFN and

VVREFP

4.4

Ω

Cia

analog input capacitance

differential linearity error

[1][2][3] --

±1

LSB

EL(adj)

integral non-linearity

[1][4] --

±2

LSB

offset error

[1][5] --

±3

LSB

gain error

[1][6] --

±0.5

absolute error

[1][7] --

±4

LSB

Rvsi

voltage source interface

resistance

[8] -

Ω

FSR

full scale range

bit

Fig 13. Suggested ADC interface - LPC2921/2923/2925 ADC1/2 IN[y] pin

LPC2XXX

ADC IN[y]SAMPLE

ADC IN[y]

20 k

Ω

3 pF

5 pF

Rvsi

VSS(IO), VSS(CORE)

VEXT

002aae280

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