ADS1015 datasheet(12/46 Pages) TI2

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8.3 Feature Description

8.3.1 Multiplexer

As shown in Figure 8-3, the ADS1115L contains an input multiplexer (MUX). Either four single-ended or two

differential signals can be measured. Additionally, AIN0 and AIN1 can be measured differentially to AIN3. The

multiplexer is configured by the MUX[2:0] bits in the Configuration register. When single-ended signals are

measured, the negative input of the ADC is internally connected to GND by a switch within the multiplexer.

VDD

GND

AIN0

VDD

GND

AIN1

VDD

GND

AIN2

VDD

GND

AIN3

AINP

AINN

GND

ADS1115L

Figure 8-3. Input Multiplexer

The ADS1114L does not have an input multiplexer and can measure either one differential signal or one

single-ended signal. For single-ended measurements, connect the AIN1 pin to GND externally. In subsequent

sections of this document, AINP refers to AIN0 and AINN refers to AIN1 for the ADS1114L.

Electrostatic discharge (ESD) diodes connected to VDD and GND protect the ADS111xL analog inputs. Keep the

absolute voltage of any input within the range shown in Equation 3 to prevent the ESD diodes from turning on.

GND – 0.3 V < V(AINX) < VDD + 0.3 V

(3)

If the voltages on the input pins can potentially violate these conditions, use external Schottky diodes and series

resistors to limit the input current to safe values (see the Absolute Maximum Ratings). Overdriving an input on

the ADS1115L can affect conversions taking place on other inputs. If overdriving an input is possible, clamp the

signal with external Schottky diodes.

ADS1114L, ADS1115L

SBASAV5 – DECEMBER 2023

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ADS1015 Datasheet(PDF) 12 Page - Texas Instruments