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ADS1100

SBAS239B – MAY 2002 – REVISED NOVEMBER 2003

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DESCRIPTION

The ADS1100 is a precision, continuously self-calibrating

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

up to 16 bits of resolution in a small SOT23-6 package.

Conversions are performed ratiometrically, using the power

supply as the reference voltage. The ADS1100 uses an

C-compatible serial interface and operates from a single

power supply ranging from 2.7V to 5.5V.

The ADS1100 can perform conversions at rates of 8, 16, 32,

or 128 samples per second. The onboard Programmable

Gain Amplifier (PGA), which offers gains of up to 8, allows

smaller signals to be measured with high resolution. In

single-conversion mode, the ADS1100 automatically powers

down after a conversion, greatly reducing current consump-

tion during idle periods.

The ADS1100 is designed for applications requiring high-

resolution measurement, where space and power consump-

tion are major considerations. Typical applications include

portable instrumentation, industrial process control, and smart

transmitters.

FEATURES

● COMPLETE DATA ACQUISITION SYSTEM IN A

TINY SOT23-6 PACKAGE

● 16-BITS NO MISSING CODES

● INL: 0.0125% of FSR MAX

● CONTINUOUS SELF-CALIBRATION

● SINGLE-CYCLE CONVERSION

● PROGRAMMABLE GAIN AMPLIFIER

GAIN = 1, 2, 4, OR 8

● LOW NOISE: 4

µVp-p

● PROGRAMMABLE DATA RATE: 8SPS to 128SPS

● INTERNAL SYSTEM CLOCK

● I

INTERFACE

● POWER SUPPLY: 2.7V to 5.5V

● LOW CURRENT CONSUMPTION: 90µA

● AVAILABLE IN EIGHT DIFFERENT ADDRESSES

APPLICATIONS

● PORTABLE INSTRUMENTATION

● INDUSTRIAL PROCESS CONTROL

● SMART TRANSMITTERS

● CONSUMER GOODS

● FACTORY AUTOMATION

● TEMPERATURE MEASUREMENT

C is a registered trademark of Philips Incorporated.

Self-Calibrating, 16-Bit

ANALOG-TO-DIGITAL CONVERTER

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.

∆Σ A/D

Converter

Interface

Clock

Oscillator

IN+

IN–

SCL

SDA

GND

A = 1, 2, 4, or 8

PGA

AD0

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

All trademarks are the property of their respective owners.

Summary of content (23 pages)

PAGE 1
ADS1100 AD0 SBAS239B – MAY 2002 – REVISED NOVEMBER 2003 Self-Calibrating, 16-Bit ANALOG-TO-DIGITAL CONVERTER FEATURES DESCRIPTION ● COMPLETE DATA ACQUISITION SYSTEM IN A TINY SOT23-6 PACKAGE The ADS1100 is a precision, continuously self-calibrating Analog-to-Digital (A/D) converter with differential inputs and up to 16 bits of resolution in a small SOT23-6 package. Conversions are performed ratiometrically, using the power supply as the reference voltage.
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ELECTROSTATIC DISCHARGE SENSITIVITY ABSOLUTE MAXIMUM RATINGS VDD to GND ........................................................................... –0.3V to +6V Input Current ............................................................... 100mA, Momentary Input Current ................................................................. 10mA, Continuous Voltage to GND, VIN+, VIN– .......................................................... –0.3V to VDD + 0.3V Voltage to GND, SDA, SCL ...........................
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ELECTRICAL CHARACTERISTICS All specifications at –40°C to +85°C, VDD = 5V, GND = 0V, and all PGAs, unless otherwise noted.
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TYPICAL CHARACTERISTICS At TA = 25°C and VDD = 5V, unless otherwise noted. SUPPLY CURRENT vs I2C BUS FREQUENCY SUPPLY CURRENT vs TEMPERATURE 250 120 225 VDD = 5V 200 IVDD (µA) IVDD (µA) 100 80 25°C 175 125°C 150 125 100 60 VDD = 2.7V –40°C 75 50 40 –60 –40 –20 0 20 40 60 80 100 120 10 140 100 OFFSET ERROR vs TEMPERATURE 2.0 VDD = 2.7V VDD = 5V 1.0 PGA = 8 PGA = 4 PGA = 2 Offset Error (mV) Offset Error (mV) 1.0 PGA = 1 0.0 –1.
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TYPICAL CHARACTERISTICS (Cont.) At TA = 25°C and VDD = 5V, unless otherwise noted. TOTAL ERROR vs INPUT SIGNAL INTEGRAL NONLINEARITY vs SUPPLY VOLTAGE 0.016 0.0 –0.5 Total Error (mV) PGA = 4 –1.0 PGA = 2 –1.5 –2.0 –2.5 –100 0.012 0.010 0.008 0.006 0.004 0.002 Data Rate = 8SPS PGA = 1 PGA = 8 PGA = 4 PGA = 2 PGA = 1 0.014 Integral Nonlinearity (% of FSR) PGA = 8 0.000 –75 –50 –25 0 25 50 75 2.5 100 3.0 3.5 4.0 5.0 5.
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TYPICAL CHARACTERISTICS (Cont.) At TA = 25°C and VDD = 5V, unless otherwise noted. DATA RATE vs TEMPERATURE FREQUENCY RESPONSE 0 10 Data Rate = 8SPS VDD = 2.7V –20 Gain (dB) Data Rate (SPS) 9 8 VDD = 5V –40 –60 7 –80 Data Rate = 8SPS 6 –60 –100 –40 –20 0 20 40 60 80 100 120 0.1 140 1 Temperature (°C) THEORY OF OPERATION The ADS1100 is a fully differential, 16-bit, self-calibrating, delta-sigma A/D converter.
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INPUT SIGNAL DATA RATE NEGATIVE FULL-SCALE –1LSB ZERO +1LSB POSITIVE FULL-SCALE 8SPS 16SPS 32SPS 128SPS 8000H C000H E000H F800H FFFFH FFFFH FFFFH FFFFH 0000H 0000H 0000H 0000H 0001H 0001H 0001H 0001H 7FFFH 3FFFH 1FFFH 07FFH TABLE II. Output Codes for Different Input Signals. CLOCK GENERATOR The ADS1100 features an onboard clock generator, which drives the operation of the modulator and digital filter. The Typical Characteristics show varieties in data rate over supply voltage and temperature.
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Communication on the I2C bus always takes place between two devices, one acting as the master and the other acting as the slave. Both masters and slaves can read and write, but slaves can only do so under the direction of the master. Some I2C devices can act as masters or slaves, but the ADS1100 can only act as a slave device. 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.
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FAST MODE PARAMETER MIN SCLK Operating Frequency HIGH-SPEED MODE MAX f(SCLK) Bus Free Time Between STOP and START Condition MIN 0.4 MAX UNITS 3.
PAGE 10
When read in single conversion mode, ST/BSY indicates whether the A/D converter is busy taking a conversion. If ST/BSY is read as 1, the A/D converter is busy, and a conversion is taking place; if 0, no conversion is taking place, and the result of the last conversion is available in the output register. In continuous mode, ST/BSY is always read as 1. READING FROM THE ADS1100 You can read the output register and the contents of the configuration register from the ADS1100.
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1 9 1 9 … SCL SDA 1 0 0 1 A2 A1 A0 D15 R/W Start By Master D14 D13 ACK By ADS1100 SDA (Continued) … 9 D7 D6 D5 D4 D3 D2 D9 … D8 ACK By Master Frame 2: Output Register Upper Byte 1 … D10 From ADS1100 Frame 1: I2C Slave Address Byte SCL (Continued) D12 D11 D1 1 ST/ BSY D0 From ADS1100 9 0 0 SC ACK By Master DR1 DR0 PGA1 PGA0 ACK By Master From ADS1100 Frame 3: Output Register Lower Byte Stop By Master Frame 4: Configuration Register (Optional) FIGURE 2.
PAGE 12
APPLICATIONS INFORMATION non-multiiple-master I2C peripherals, will work with the ADS1100. The ADS1100 does not perform clock-stretching (i.e., 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. The sections that follow give example circuits and tips for using the ADS1100 in various situations. An evaluation board, the ADS1100EVM, is available. This small, simple board connects to an RS-232 serial port on almost any PC.
PAGE 13
I2C Pull-Up Resistors 1kΩ to 10kΩ (typ.) Note that no pull-up resistor is shown on the SCL line. In this simple case, the resistor is not needed; the microcontroller can simply leave the line on output, and set it to one or zero as appropriate. It can do this because the ADS1100 never drives its clock line low. This technique can also be used with multiple devices, and has the advantage of lower current consumption due to the absence of a resistive pull-up.
PAGE 14
Negative input voltages must be level-shifted. A good candidate for this function is the Texas Instruments THS4130 differential amplifier, which can output fully differential signals. This device can also help recover the lost bit noted previously for single-ended positive signals. Level shifting can also be performed using the DRV134.
PAGE 15
Many resistive bridge sensors, such as strain gauges, have very small full-scale output ranges. For these sensors, the measurement resolution obtainable without additional amplification can be low. For example, if the bridge sensor output is ±20mV, the ADS1100 outputs codes from approximately –873 to +873, resulting in a best-case resolution of around 11 bits. If higher resolution is required, it is best to supply an external instrumentation amplifier to bring the signal to full scale.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com (4) 31-Oct-2013 There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device. (5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation of the previous line and the two combined represent the entire Device Marking for that device.
PAGE 19
PACKAGE MATERIALS INFORMATION www.ti.com 12-Aug-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) ADS1100A0IDBVR 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 ADS1100A0IDBVT SOT-23 DBV 6 250 178.0 9.0 3.23 3.17 1.37 4.0 8.0 Q3 ADS1100A1IDBVR 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 12-Aug-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) ADS1100A0IDBVR SOT-23 DBV 6 3000 180.0 180.0 18.0 ADS1100A0IDBVT SOT-23 DBV 6 250 180.0 180.0 18.0 ADS1100A1IDBVR SOT-23 DBV 6 3000 180.0 180.0 18.0 ADS1100A1IDBVT SOT-23 DBV 6 250 180.0 180.0 18.0 ADS1100A2IDBVR SOT-23 DBV 6 3000 180.0 180.0 18.0 ADS1100A2IDBVT SOT-23 DBV 6 250 180.0 180.
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