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ADS1115-Q1 Datasheet(PDF) 11 Page - Texas Instruments

Part # ADS1115-Q1
Description  Analog-to-Digital Converter With Internal Reference
Download  39 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

ADS1115-Q1 Datasheet(HTML) 11 Page - Texas Instruments

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16-Bit
Σ
ADC
I C
Interface
2
Voltage
Reference
Oscillator
ALERT/RDY
SCL
SDA
ADDR
Gain = 2/3, 1,
2, 4, 8, or 16
PGA
Comparator
ADS1115-Q1
AIN1
AIN2
GND
AIN0
AIN3
VDD
MUX
ADS1115-Q1
www.ti.com
SBAS563B – DECEMBER 2011 – REVISED DECEMBER 2015
7 Detailed Description
7.1 Overview
The ADS1115-Q1 device is a small, low-power, 16-bit, delta-sigma (
ΔΣ) analog-to-digital converter (ADC). The
ADS1115-Q1 device is easy to configure and design into a wide variety of applications, and allows precise
measurements to be obtained with very little effort.
The ADS1115-Q1 device consists of a
ΔΣ ADC core with adjustable gain, an internal voltage reference, a clock
oscillator, and an I2C interface. An additional feature available on the ADS1115-Q1 device is a programmable
digital comparator that provides an alert on a dedicated pin. All of these features are intended to reduce required
external circuitry and improve performance.
The ADS1115-Q1 ADC core measures a differential signal, VIN, that is the difference between AINP and AINN. A
MUX is available on the ADS1115-Q1 device to route the four input channels to AINP and AINN. This architecture
results in a strong attenuation in any common-mode signals. The converter core consists of a differential,
switched-capacitor
ΔΣ modulator followed by a digital filter. Input signals are compared to the internal voltage
reference. The digital filter receives a high-speed bitstream from the modulator and outputs a code proportional
to the input voltage.
The ADS1115-Q1 device has two available conversion modes: single-shot mode and continuous conversion
mode. In single-shot mode, the ADC performs one conversion of the input signal upon request and stores the
value to an internal result register. The device then enters a low-power shutdown mode. This mode is intended to
provide significant power savings in systems that only require periodic conversions or when there are long idle
periods between conversions. In continuous conversion mode, the ADC automatically begins a conversion of the
input signal as soon as the previous conversion is completed. The rate of continuous conversion is equal to the
programmed data rate. Data can be read at any time and always reflect the most recent completed conversion.
7.2 Functional Block Diagram
7.3 Feature Description
7.3.1 Multiplexer
The ADS1115-Q1 device contains an input multiplexer, as shown in Figure 22. 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 three bits in the Config register (see the Config Register section). When the single-
ended signals are measured, the negative input of the ADC is internally connected to GND by a switch within the
multiplexer.
Copyright © 2011–2015, Texas Instruments Incorporated
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