Datasheet

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SBAS276A − MARCH 2003 − REVISED NOVEMBER 2003

16-Bit ANALOG-TO-DIGITAL CONVERTER

with Onboard Reference

ADS1110

FEATURES

D COMPLETE DATA ACQUISITION SYSTEM IN

A TINY SOT23-6 PACKAGE

D ONBOARD REFERENCE:

Accuracy: 2.048V ±0.05%

Drift: 5ppm/°C

D ONBOARD PGA

D ONBOARD OSCILLATOR

D 16-BITS NO MISSING CODES

D INL: 0.01% of FSR max

D CONTINUOUS SELF-CALIBRATION

D SINGLE-CYCLE CONVERSION

D PROGRAMMABLE DATA RATE: 15SPS TO

240SPS

D I

CINTERFACE—EIGHT AVAILABLE

ADDRESSES

D POWER SUPPLY: 2.7V to 5.5V

D LOW CURRENT CONSUMPTION: 240µA

APPLICATIONS

D PORTABLE INSTRUMENTATION

D INDUSTRIAL PROCESS CONTROL

D SMART TRANSMITTERS

D CONSUMER GOODS

D FACTORY AUTOMATION

D TEMPERATURE MEASUREMENT

DESCRIPTION

The ADS1110 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. The

onboard 2.048V reference provides an input range of

±2.048V differentially. The ADS1110 uses an I

C-compatible

serial interface and operates from a single power supply

ranging from 2.7V to 5.5V.

The ADS1110 can perform conversions at rates of 15, 30, 60,

or 240 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 ADS1110 automatically powers

down after a conversion, greatly reducing current

consumption during idle periods.

The ADS1110 is designed for applications requiring

high-resolution measurement, where space and power

consumption are major considerations. Typical applications

include portable instrumentation, industrial process control,

and smart transmitters.

www.ti.com

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.

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Summary of content (23 pages)

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ADS1110 SBAS276A − MARCH 2003 − REVISED NOVEMBER 2003 16-Bit ANALOG-TO-DIGITAL CONVERTER with Onboard Reference FEATURES DESCRIPTION D COMPLETE DATA ACQUISITION SYSTEM IN The ADS1110 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. The onboard 2.048V reference provides an input range of ±2.048V differentially.
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ADS1110 www.ti.com SBAS276A − MARCH 2003 − REVISED NOVEMBER 2003 ABSOLUTE MAXIMUM RATINGS(1) VDD to GND Input Current 100mA, Momentary −0.3V to +6V Input Current 10mA, Continuous Voltage to GND, VIN+, VIN− −0.3V to VDD + 0.3V Voltage to GND, SDA, SCL −0.5V to 6V Maximum Junction Temperature +150°C Operating Temperature Range −40°C to +125°C Storage Temperature Range −60°C to +150°C This integrated circuit can be damaged by ESD.
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ADS1110 www.ti.com SBAS276A − MARCH 2003 − REVISED NOVEMBER 2003 ELECTRICAL CHARACTERISTICS All specifications at −40°C to +85°C, VDD = 5V, and all PGAs, unless otherwise noted. ADS1110 PARAMETER CONDITIONS MIN TYP MAX UNIT ANALOG INPUT Full-Scale Input Voltage Analog Input Voltage (VIN+) − (VIN−) VIN+ to GND or VIN− to GND ±2.048/PGA GND − 0.2 Differential Input Impedance Common-Mode Input Impedance PGA = 1 PGA = 2 PGA = 4 PGA = 8 V VDD + 0.2 V 2.8/PGA MΩ 3.5 3.5 1.8 0.
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ADS1110 www.ti.com SBAS276A − MARCH 2003 − REVISED NOVEMBER 2003 TYPICAL CHARACTERISTICS At TA = 25°C and VDD = 5V, unless otherwise noted.
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ADS1110 www.ti.com SBAS276A − MARCH 2003 − REVISED NOVEMBER 2003 TYPICAL CHARACTERISTICS (continued) At TA = 25°C and VDD = 5V, unless otherwise noted.
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ADS1110 www.ti.com SBAS276A − MARCH 2003 − REVISED NOVEMBER 2003 TYPICAL CHARACTERISTICS (continued) At TA = 25°C and VDD = 5V, unless otherwise noted. THEORY OF OPERATION The ADS1110 is a fully differential, 16-bit, self-calibrating, delta-sigma A/D converter. Extremely easy to design with and configure, the ADS1110 allows precise measurements to be obtained with a minimum of effort. mance of the onboard reference as well as the performance of the A/D converter core.
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ADS1110 www.ti.com SBAS276A − MARCH 2003 − REVISED NOVEMBER 2003 For example, the ideal expression for output codes with a data rate of 16SPS and PGA = 2 is: Output Code + 16384 2 (VIN)) * (VIN*) 2.048V The ADS1110 outputs all codes right-justified and sign-extended. This makes it possible to perform averaging on the higher data rate codes using only a 16-bit accumulator. Table 2 shows the output codes for various input levels.
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ADS1110 www.ti.com SBAS276A − MARCH 2003 − REVISED NOVEMBER 2003 USING THE ADS1110 OPERATING MODES The ADS1110 operates in one of two modes: continuous conversion or single conversion. In continuous conversion mode, the ADS1110 continuously performs conversions. Once a conversion has been completed, the ADS1110 places the result in the output register and immediately begins another conversion. In single conversion mode, the ADS1110 waits until the ST/DRDY bit in the conversion register is set to 1.
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ADS1110 www.ti.com SBAS276A − MARCH 2003 − REVISED NOVEMBER 2003 When a master has finished communicating with a slave, it may issue a STOP condition. When a STOP condition is issued, the bus becomes idle again. A master may also issue another START condition. When a START condition is issued while the bus is active, it is called a repeated START condition. Each variant of the ADS1110 is marked with EDx, where x identifies the address variant.
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ADS1110 www.ti.com SBAS276A − MARCH 2003 − REVISED NOVEMBER 2003 I2C DATA RATES For more information on High-speed mode, consult the I2C specification. The I2C bus operates in one of three speed modes: Standard, which allows a clock frequency of up to 100kHz; Fast, which allows a clock frequency of up to 400kHz; and High-speed mode (also called Hs mode), which allows a clock frequency of up to 3.4MHz. The ADS1110 is fully compatible with all three modes.
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ADS1110 www.ti.com SBAS276A − MARCH 2003 − REVISED NOVEMBER 2003 CONFIGURATION REGISTER The 8-bit configuration register can be used to control the ADS1110’s operating mode, data rate, and PGA settings. The configuration register format is shown in Table 5. The default setting is 8CH. BIT 7 6 5 4 3 2 1 0 NAME ST/DRDY 0 0 SC DR1 DR0 PGA1 PGA0 DEFAULT 1 0 0 0 1 1 0 0 Table 5.
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ADS1110 www.ti.com SBAS276A − MARCH 2003 − REVISED NOVEMBER 2003 READING FROM THE ADS1110 To read the output register and the configuration register from the ADS1110, address the ADS1110 for reading, then read three bytes. The first two bytes will be the output register’s contents, and the third will be the configuration register’s contents. It is not required to read the configuration register byte. It is permissible to read fewer than three bytes during a read operation.
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ADS1110 www.ti.com SBAS276A − MARCH 2003 − REVISED NOVEMBER 2003 APPLICATIONS INFORMATION The sections that follow give example circuits and tips for using the ADS1110 in various situations. BASIC CONNECTIONS For many applications, connecting the ADS1110 is extremely simple. A basic connection diagram for the ADS1110 is shown in Figure 4. Pull-up resistors are necessary on both the SDA and SCL lines because I2C bus drivers are open-drain.
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ADS1110 www.ti.com SBAS276A − MARCH 2003 − REVISED NOVEMBER 2003 Figure 6 shows a circuit with several different devices connected to a single I2C bus. A Texas Instruments TMP100 temperature sensor and a Texas Instruments DAC8574 4-channel 16-bit digital-to-analog converter share the bus with two ADS1110s. Figure 7. Using GPIO with a Single ADS1110 Bit-banging I2C with GPIO pins can be done by setting the GPIO line to zero and toggling it between input and output modes to apply the proper bus states.
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ADS1110 www.ti.com SBAS276A − MARCH 2003 − REVISED NOVEMBER 2003 SINGLE-ENDED INPUTS Although the ADS1110 has a fully differential input, it can easily measure single-ended signals. A simple single-ended connection scheme is shown in Figure 8. The ADS1110 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 0V to 2.048V. The ADS1110 loses no linearity anywhere in its input range.
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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 24-Jan-2013 Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material) (3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature. (4) Only one of markings shown within the brackets will appear on the physical device.
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PACKAGE MATERIALS INFORMATION www.ti.com 26-Jan-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) ADS1110A0IDBVR 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 ADS1110A0IDBVT SOT-23 DBV 6 250 178.0 9.0 3.23 3.17 1.37 4.0 8.0 Q3 ADS1110A1IDBVR 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 26-Jan-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) ADS1110A0IDBVR SOT-23 DBV 6 3000 180.0 180.0 18.0 ADS1110A0IDBVT SOT-23 DBV 6 250 180.0 180.0 18.0 ADS1110A1IDBVR SOT-23 DBV 6 3000 180.0 180.0 18.0 ADS1110A1IDBVT SOT-23 DBV 6 250 180.0 180.0 18.0 ADS1110A2IDBVR SOT-23 DBV 6 3000 180.0 180.0 18.0 ADS1110A2IDBVT SOT-23 DBV 6 250 180.0 180.
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