EM357-RTR datasheet(172/241 Pages) SILABS

172 / 241 page

Rev 1.3

172

10. ADC (Analog to Digital Converter)

The EM35x ADC is a first-order sigma-delta converter with the following features:



Resolution of up to 14 bits



Sample times as fast as 5.33 µs (188 kHz)



Differential and single-ended conversions from six external and four internal sources



One voltage range (differential): -VREF to +VREF



Choice of internal or external VREF



Internal VREF may be output to PB0 or external VREF may be derived from PB0



Digital offset and gain correction



Dedicated DMA channel with one-shot and continuous operating modes

Figure 10.1 shows the basic ADC structure.

Figure 10.1. ADC Block Diagram

While the ADC Module supports both single-ended and differential inputs, the ADC input stage always operates in

differential mode. Single-ended conversions are performed by connecting one of the differential inputs to VREF/2

while fully differential operation uses two external inputs.

Note:

The regulator input voltage, VDD_PADS, cannot be measured using the ADC, but it can be measured through Ember

software.

Delta

Sigma

ADC

Decimator

Sample clock

1MHz

6MHz

VREF

VREF/2

GND

VDD_PADSA/2

GPIO

P input

MUX

VREF

VREF/2

GND

VDD_PADSA/2

GPIO

N input

MUX

ADC_DATA

or DMA

Offset and

Gain

Correction

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