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ADS1015-Q1 Arkusz danych(PDF) 8 Page - Texas Instruments

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Numer części ADS1015-Q1
Szczegółowy opis  Low-Power 12-Bit Analog-to-Digital Converter With Internal Reference
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Producent  TI1 [Texas Instruments]
Strona internetowa  http://www.ti.com
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ADS1015-Q1 Arkusz danych(HTML) 8 Page - Texas Instruments

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12-Bit
ADC
Σ
I C
Interface
2
Voltage
Reference
Oscillator
ALERT/RDY
SCL
SDA
ADDR
Gain = 2/3, 1,
2, 4, 8, or 16
PGA
Comparator
ADS1015-Q1
AIN1
AIN2
GND
AIN0
AIN3
VDD
MUX
8
ADS1015-Q1
SBAS511A – JULY 2010 – REVISED MARCH 2016
www.ti.com
Product Folder Links: ADS1015-Q1
Submit Documentation Feedback
Copyright © 2010–2016, Texas Instruments Incorporated
8 Detailed Description
8.1 Overview
The ADS1015-Q1 device is a very small, low-power, 12-bit, delta-sigma (
ΔΣ) analog-to-digital converter (ADC).
The ADS1015-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 ADS1015QDGSRQ1 package option is automotive
qualified, and the ADS1015AQDGSRQ1 package option is AEC-Q100 qualified.
The ADS1015-Q1 device consists of a
ΔΣ ADC core with adjustable gain, an internal voltage reference, a clock
oscillator, and an I2C interface. Another feature available on the ADS1015-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. Figure 8 shows the ADS1015-Q1 device functional block diagram.
The ADS1015-Q1 device ADC core measures a differential signal, VIN, that is the difference of AINP and AINN. A
MUX is available on the ADS1015-Q1 device. This architecture results in a strong attenuation of 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 ADS1015-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.
8.2 Functional Block Diagram
Figure 8. Functional Block Diagram
8.3 Feature Description
8.3.1 Multiplexer
The ADS1015-Q1 device contains an input multiplexer, as shown in Figure 9. Either four single-ended or two
differential signals can be measured. Additionally, AIN0 and AIN1 may be measured differentially to AIN3. The
multiplexer is configured by three bits in the Config register. When single-ended signals are measured, the
negative input of the ADC is internally connected to GND by a switch within the multiplexer.


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