ADS1119 datasheet(16/51 Pages) TI1

Part #	ADS1119

Description	4-Channel, 1-kSPS, 16-Bit, Delta-Sigma ADC With I2C Interface

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Manufacturer	TI1 [Texas Instruments]

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To ADC

AINP

AINN

AIN0

AIN1

AGND

AVDD

AGND

AVDD

AGND

AIN2

AIN3

AVDD

AGND

AVDD

AGND

AVDD / 2

Rail-to Rail

Buffers

16

ADS1119

SBAS925 – AUGUST 2018

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8.3 Feature Description

8.3.1 Multiplexer

Figure 27 shows the flexible input multiplexer of the device. Either four single-ended signals, two differential

signals, or a combination of two single-ended signals and one differential signal can be measured. The positive

(AINP) and negative (AINN) inputs selected for measurement are configured by three bits (MUX[2:0]) in the

configuration register. When single-ended signals need to be measured, the negative ADC input (AINN) can

internally be connected to AGND by a switch within the multiplexer.

Figure 27. Analog Input Multiplexer

Electrostatic discharge (ESD) diodes to AVDD and AGND protect the inputs. The absolute voltage on any input

must stay within the range provided by Equation 3 to prevent the ESD diodes from turning on:

AGND – 0.3 V < V(AINx) < AVDD + 0.3 V

(3)

If the voltages on the input pins have any potential to violate these conditions, external Schottky clamp diodes or

series resistors may be required to limit the input current to safe values (see the Absolute Maximum Ratings

table). Overdriving an unused input on the device can affect conversions taking place on other input pins.

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ADS1119 Datasheet(PDF) 16 Page - Texas Instruments

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