12-Bit

ADC

DS

I C

Interface

2

Voltage

Reference

Oscillator

ALERT/RDY

SCL

SDA

ADDR

Gain=2/3, 1,

2,4,8,or16

PGA

Comparator

ADS1015

AIN1

AIN2

GND

AIN0

AIN3

VDD

MUX

ADS1015-Q1

www.ti.com

SBAS511 – JULY 2010

OVERVIEW

The ADS1015 is very small, low-power, 12-bit, delta-sigma (

ΔΣ) analog-to-digital converters (ADCs). The

ADS1015 is extremely easy to configure and design into a wide variety of applications, and allow precise

measurements to be obtained with very little effort. Both experienced and novice users of data converters find

designing with the ADS1015 to be intuitive and problem-free.

The ADS1015 consist of a

ΔΣ analog-to-digital (A/D) core with adjustable gain, an internal voltage reference, a

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 functional block diagram.

available on the ADS1015. This architecture results in a very 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 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.

Figure 8. Functional Block Diagram

QUICKSTART GUIDE

This section provides a brief example of ADS1015 communications. Refer to subsequent sections of this data

components such as resistors, capacitors, and serial connectors; and a 2V to 5V power supply. Figure 9 shows

the basic hardware configuration.

clock signal on the SCL pin and data are transferred via the SDA pin. The ADS1015 never drives the SCL pin.

For information on programming and debugging the microcontroller being used, refer to the device-specific

product data sheet.

The first byte sent by the master should be the ADS1015 address followed by a bit that instructs the ADS1015 to

listen for a subsequent byte. The second byte is the register pointer. Refer to Table 6 for a register map. The

third and fourth bytes sent from the master are written to the register indicated in the second byte. Refer to

Figure 16 and Figure 17 for read and write operation timing diagrams, respectively. All read and write

transactions with the ADS1015 must be preceded by a start condition and followed by a stop condition.

Copyright © 2010, Texas Instruments Incorporated

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Product Folder Link(s): ADS1015-Q1