LPC1786 datasheet(98/117 Pages) NXP

98 / 117 page

LPC178X_7X

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Objective data sheet

Rev. 2 — 27 May 2011

98 of 117

NXP Semiconductors

LPC178x/7x

32-bit ARM Cortex-M3 microcontroller

13. DAC electrical characteristics

The values of resistor components Ri1 and Ri2 vary with temperature and input voltage and are

process-dependent.

Fig 32. ADC interface to pins ADC0_IN[n]

Table 30.

ADC interface components

Component

Range

Description

Ri1

2 k

 to 5.2 k

Switch-on resistance for channel selection switch. Varies with

temperature, input voltage, and process.

Ri2

100

 to 600 

Switch-on resistance for the comparator input switch. Varies

with temperature, input voltage, and process.

750 fF

Parasitic capacitance from the ADC block level.

65 fF

Parasitic capacitance from the ADC block level.

2.2 pF

Sampling capacitor.

LPC17xx

AD0[n]

750 fF

65 fF

Cia

2.2 pF

Rvsi

Ri2

100

Ω - 600 Ω

Ri1

2 k

Ω - 5.2 kΩ

VSS

VEXT

002aaf197

ADC

COMPARATOR

BLOCK

Table 31.

DAC electrical characteristics

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

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

differential linearity

error

1-

LSB

EL(adj)

integral non-linearity

1.5

LSB

offset error

0.6

gain error

0.6

load capacitance

200

load resistance



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