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BD0

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FEATURES DESCRIPTION

APPLICATIONS

ADS1000

Clock

Oscillator

I C

Interface

A/D

Converter

PGA

A=1,2,4,or8

IN+

IN-

GND

SDA

SCL

ADS1000

SBAS357A – SEPTEMBER 2006 – REVISED OCTOBER 2007

LOW-POWER, 12-Bit ANALOG-TO-DIGITAL CONVERTER

with I

C™ INTERFACE

• Complete 12-Bit Data Acquisition System in

The ADS1000 is an I

C-compatible serial interface

a Tiny SOT-23 Package

Analog-to-Digital (A/D) converter with differential

inputs and 12 bits of resolution in a tiny SOT23-6

• Low Current Consumption: Only 90 μ A

package. Conversions are performed ratiometrically,

• Integral Nonlinearity: 1LSB Max

using the power supply as the reference voltage. The

• Single-Cycle Conversion

ADS1000 operates from a single power supply

ranging from 2.7V to 5.5V.

• Programmable Gain Amplifier

Gain = 1, 2, 4, or 8

The ADS1000 performs conversions at a rate of 128

• 128SPS Data Rate

samples per second (SPS). The onboard

programmable gain amplifier (PGA), which offers

• I

C Interface with Two Available Addresses

gains of up to 8, allows smaller signals to be

• Power Supply: 2.7V to 5.5V

measured with high resolution. In single-conversion

• Pin- and Software-Compatible with 16-Bit

mode, the ADS1000 automatically powers down after

ADS1100

a conversion, greatly reducing current consumption

during idle periods.

The ADS1000 is designed for applications where

• Voltage Monitors

space and power consumption are major

considerations. Typical applications include portable

• Battery Management

instrumentation, consumer goods, and voltage

• Industrial Process Control

monitoring.

• Consumer Goods

• Temperature Measurement

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2 I2C is a trademark of NXP Semiconductors, Inc.

3 All other trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

Summary of content (22 pages)

PAGE 1
BD0 ADS1000 SBAS357A – SEPTEMBER 2006 – REVISED OCTOBER 2007 LOW-POWER, 12-Bit ANALOG-TO-DIGITAL CONVERTER with I2C™ INTERFACE FEATURES DESCRIPTION • Complete 12-Bit Data Acquisition System in a Tiny SOT-23 Package • Low Current Consumption: Only 90μA • Integral Nonlinearity: 1LSB Max • Single-Cycle Conversion • Programmable Gain Amplifier Gain = 1, 2, 4, or 8 • 128SPS Data Rate • I2C Interface with Two Available Addresses • Power Supply: 2.7V to 5.
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ADS1000 www.ti.com SBAS357A – SEPTEMBER 2006 – REVISED OCTOBER 2007 This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage. ESD damage can range from subtle performance degradation to complete device failure.
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ADS1000 www.ti.com SBAS357A – SEPTEMBER 2006 – REVISED OCTOBER 2007 ELECTRICAL CHARACTERISTICS All specifications at –40°C to +85°C, VDD = 5V, GND = 0V, and all PGAs, unless otherwise noted. ADS1000 PARAMETER CONDITIONS MIN TYP MAX UNIT ANALOG INPUT Full-Scale Input Voltage Analog Input Voltage ±VDD/PGA (1) (VIN+) – (VIN–) VIN+, VIN– to GND GND – 0.2 Differential Input Impedance Common-Mode Input Impedance V VDD + 0.2 V 2.
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ADS1000 www.ti.com SBAS357A – SEPTEMBER 2006 – REVISED OCTOBER 2007 TYPICAL CHARACTERISTICS At TA = 25°C and VDD = 5V, unless otherwise indicated. SUPPLY CURRENT vs I2C BUS FREQUENCY SUPPLY CURRENT vs TEMPERATURE 120 250 225 VDD = 5V 200 IVDD (µA) I VDD (µA) 100 80 25_C 175 125_C 150 125 60 100 VDD = 2.7V −40_C 75 40 50 −60 −40 −20 0 20 40 60 80 100 120 10 140 100 1k I2C Bus Frequency (kHz) Temperature (_C) Figure 1. 10k Figure 2.
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ADS1000 www.ti.com SBAS357A – SEPTEMBER 2006 – REVISED OCTOBER 2007 THEORY OF OPERATION The ADS1000 is a fully differential, 12-bit A/D converter. The ADS1000 allows users to obtain precise measurements with a minimum of effort, and the device is extremely easy to design with and configure. The ADS1000 consists of an A/D converter core with adjustable gain, a clock generator, and an I2C interface. Each of these blocks are described in detail in the sections that follow.
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ADS1000 www.ti.com SBAS357A – SEPTEMBER 2006 – REVISED OCTOBER 2007 An I2C bus consists of two lines, SDA and SCL. SDA carries data; SCL provides the clock. All data is transmitted across the I2C bus in groups of eight bits. To send a bit on the I2C bus, the SDA line is driven to the bit level while SCL is low (a Low on SDA indicates the bit is '0'; a High indicates the bit is '1'). Once the SDA line has settled, the SCL line is brought high, then low.
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ADS1000 www.ti.com SBAS357A – SEPTEMBER 2006 – REVISED OCTOBER 2007 t(LOW) tR t(HDSTA) tF SCL t(HDSTA) t(HIGH) t(HDDAT) t(SUSTO) t(SUSTA) t(SUDAT) SDA t(BUF) P S S P Figure 6. I2C Timing Diagram Table 1. Timing Diagram Definitions FAST MODE PARAMETER SCLK Operating Frequency Bus Free Time Between STOP and START Condition MIN f(SCLK) HIGH-SPEED MODE MAX MIN 0.4 MAX UNITS 3.
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ADS1000 www.ti.com SBAS357A – SEPTEMBER 2006 – REVISED OCTOBER 2007 ADS1000 I2C ADDRESSES mode must be activated. To activate High-speed mode, send a special address byte of 00001XXX following the start condition, where the XXX bits are unique to the Hs-capable master. This byte is called the Hs master code. (Note that this is different from normal address bytes; the low bit does not indicate read/write status.
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ADS1000 www.ti.com SBAS357A – SEPTEMBER 2006 – REVISED OCTOBER 2007 CONFIGURATION REGISTER A user controls the ADS1000 operating mode and PGA settings via the 8-bit configuration register. The configuration register format is shown in Table 3. The default setting is 80H. Bits 1 - 0: PGA Bits 1 and 0 control the ADS1000 gain setting; see Table 4. Table 4. PGA Bits Table 3.
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ADS1000 www.ti.
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ADS1000 www.ti.com SBAS357A – SEPTEMBER 2006 – REVISED OCTOBER 2007 APPLICATION INFORMATION The ADS1000 interfaces directly to standard mode, fast mode, and high-speed mode I2C controllers. Any microcontroller I2C peripheral, including master-only and non-multiple-master I2C peripherals, will work with the ADS1000. The ADS1000 does not perform clock-stretching (that is, it never pulls the clock line low), so it is not necessary to provide for this unless other devices are on the same I2C bus.
PAGE 12
ADS1000 www.ti.com SBAS357A – SEPTEMBER 2006 – REVISED OCTOBER 2007 CONNECTING MULTIPLE DEVICES VDD ADS1000 Connecting two ADS1000s to a single bus is almost trivial. An example showing two ADS1000s and one ADS1100 connected on a single bus is shown in Figure 10. Multiple devices can be connected to a single bus (provided that their addresses are different).
PAGE 13
ADS1000 www.ti.com SBAS357A – SEPTEMBER 2006 – REVISED OCTOBER 2007 SINGLE-ENDED INPUTS Although the ADS1000 has a fully differential input, it can easily measure single-ended signals. A simple single-ended connection scheme is shown in Figure 12. The ADS1000 is configured for single-ended measurement by grounding either of its input pins, usually VIN–, and applying the input signal to VIN+. The single-ended signal can range from –0.2V to VDD + 0.3V.
PAGE 14
ADS1000 www.ti.com SBAS357A – SEPTEMBER 2006 – REVISED OCTOBER 2007 ADDITIONAL RECOMMENDATIONS The ADS1000 is fabricated in a small-geometry low-voltage process. The analog inputs feature protection diodes to the supply rails. However, the current-handling ability of these diodes is limited, and the ADS1000 can be permanently damaged by analog input voltages that remain more than approximately 300mV beyond the rails for extended periods.
PAGE 15
ADS1000 www.ti.com SBAS357A – SEPTEMBER 2006 – REVISED OCTOBER 2007 Revision History NOTE: Page numbers for previous revisions may differ from page numbers in the current version. Changes from Original (September 2006) to Revision A ............................................................................................... Page • Changed logic level min value from (0.7GND) to (0.7VDD) ..................................................................................................
PAGE 16
PACKAGE OPTION ADDENDUM www.ti.
PAGE 17
PACKAGE OPTION ADDENDUM www.ti.com (4) 24-Jan-2013 Only one of markings shown within the brackets will appear on the physical device. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information.
PAGE 18
PACKAGE MATERIALS INFORMATION www.ti.com 17-Sep-2011 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) ADS1000A0IDBVR SOT-23 DBV 6 3000 178.0 9.0 B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant 3.23 3.17 1.37 4.0 8.0 Q3 ADS1000A0IDBVT SOT-23 DBV 6 250 178.0 9.0 3.23 3.17 1.37 4.0 8.0 Q3 ADS1000A1IDBVR SOT-23 DBV 6 3000 178.0 9.0 3.23 3.17 1.37 4.0 8.
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PACKAGE MATERIALS INFORMATION www.ti.com 17-Sep-2011 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) ADS1000A0IDBVR SOT-23 DBV 6 3000 180.0 180.0 18.0 ADS1000A0IDBVT SOT-23 DBV 6 250 180.0 180.0 18.0 ADS1000A1IDBVR SOT-23 DBV 6 3000 180.0 180.0 18.0 ADS1000A1IDBVT SOT-23 DBV 6 250 180.0 180.0 18.
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IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.