COMBOSMARTMETER datasheet(15/60 Pages) TI1

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MUX[2:0] = 101

TempP

MUX[2:0] = 100

MvddP

(1)

MUX[2:0] = 011

MUX[2:0] = 000

MUX[2:0] = 001

To PgaP

To PgaN

MUX[2:0] = 001

VINP

VINN

MUX[2:0] = 000

MvddN

(1)

TempN

MUX[2:0] = 100

MUX[2:0] = 101

Device

MUX

TestP

TestN

TESTP

INT_TEST

TESTN

INT_TEST

MUX[2:0] = 011

(VREFP + VREFN)

EMI

Filter

ADS131E04

ADS131E06

ADS131E08

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SBAS561A – JUNE 2012 – REVISED APRIL 2013

THEORY OF OPERATION

This section contains details of the ADS131E0x internal functional elements. The analog blocks are discussed

first, followed by the digital interface. Information on implementing power monitoring specific applications is

covered towards the end of this document.

Throughout this document, fCLK denotes the signal frequency at the CLK pin, tCLK denotes the signal period at the

CLK pin, fDR denotes the output data rate, tDR denotes the output data time period, and fMOD denotes the

frequency at which the modulator samples the input.

EMI FILTER

An RC filter at the input acts as an EMI filter on all channels. The –3-dB filter bandwidth is approximately

3 MHz.

INPUT MULTIPLEXER

The ADS131E0x input multiplexers are very flexible and provide many configurable signal switching options.

Figure 17 shows a diagram of the multiplexer on a single channel of the device. VINP and VINN are separate for

each of the eight blocks. This flexibility allows for significant device and sub-system diagnostics, calibration, and

configuration. Switch settings for each channel are selected by writing the appropriate values to the CHnSET

(1) MVDD monitor voltage supply depends on channel number; see the Supply Measurements (MVDDP, MVDDN) section.

Figure 17. Input Multiplexer Block for One Channel

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Product Folder Links: ADS131E04 ADS131E06 ADS131E08

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