NRF52811-QCAA-R7 datasheet(282/444 Pages) NORDIC

282 / 444 page

Peripherals

Symbol

Description

Min.

Typ.

Max.

Units

tACQ,400k

Acquisition time (configurable), source Resistance <=

400kOhm

µs

tACQ,800k

Acquisition time (configurable), source Resistance <=

800kOhm

µs

tCONV

Conversion time

µs

EG1/6

Errorb for Gain = 1/6

-3

EG1/4

Errorb for Gain = 1/4

-3

EG1/2

Errorb for Gain = 1/2

-3

EG1

Errorb for Gain = 1

-3

CSAMPLE

Sample and hold capacitance at maximum gain21

2.5

RINPUT

Input resistance

MΩ

ENOB

Effective number of bits, differential mode, 12-bit

resolution, 1/1 gain, 3 µs acquisition time, crystal HFCLK,

200 ksps

Bit

SNDR

Peak signal to noise and distortion ratio, differential mode,

12-bit resolution, 1/1 gain, 3 µs acquisition time, crystal

HFCLK, 200 ksps

SFDR

Spurious free dynamic range, differential mode, 12-bit

resolution, 1/1 gain, 3 µs acquisition time, crystal HFCLK,

200 ksps

dBc

RLADDER

Ladder resistance

160

kΩ

6.17.13 Performance factors

Clock jitter, affecting sample timing accuracy, and circuit noise can affect ADC performance.

Jitter can be between START tasks or from START task to acquisition. START timer accuracy and startup

times of regulators and references will contribute to variability. Sources of circuit noise may include CPU

activity and the DC/DC regulator. Best ADC performance is achieved using START timing based on the

TIMER module, HFXO clock source, and Constant Latency mode.

6.18 SPI — Serial peripheral interface master

The SPI master provides a simple CPU interface which includes a TXD register for sending data and an RXD

b Does not include temperature drift

21 Maximum gain corresponds to highest capacitance.

4454_140 v1.0

282

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