PGA309AIPWRG4 - Texas Instruments - Datasheet.Technology

Monitoring and maintaining process variables at the appropriate levels is extremely critical in

industrial auto ma tion and process control. A sensor in the industrial environment is either

continuously or periodically measuring vital parameters such as temperature, pressure, ﬂ ow,

etc. The primary challenge of sensing in industrial environments is conditioning low signal

levels in the presence of high noise and high surge voltage.

This warrants for extremely low noise, low drift, precision programmable gain ampliﬁ ers

and instrumentation ampliﬁ ers with an appropriate common-mode voltage. The rate of change

of the measured signal is usually not very rapid and hence high-resolution precision delta-

sigma converters are widely used in industrial sensors. Low power consumption is another key

requirement for industrial sensors as many of them are powered off the traditional 4–20 mA

loop. Digital connectivity features such as PROFIBUS, IO-Link, and wireless connectivity are

increasing in popularity as they provide continuous monitoring, fault diagnostics and reduce

start up times, greatly improving productivity and efﬁ ciency of the automation loop.

Texas Instruments (TI) has a broad portfolio of products catering to industrial sensing,

ranging from best-in-class precision ampliﬁ ers and data converters to interface products,

power products and high-performance microprocessors. TI’s cutting-edge semiconductor

manufacturing processes provide industrial designers with products that meet the highest

standards and that are optimized for industrial environments and extended product life cycles.

Industrial Automation Solutions

Sensors and Field Transmitters

TI’s sensor solutions speed the design cycle with the

right devices, software, tools and support.

What’s inside:

Field Transmitter:

Temperature Sensor

Field Transmitter:

Pressure Sensor

Flowmeters:

• Electromagnetic

• Coriolis

Electronic Weigh Scale

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Temperature sensors are used to measure temp-

erature and have a wide range of uses in industrial

and com mer cial applications. Temperature

measure ments are commonly made by using a

resistance temperature detector (RTD), thermistor

or thermocouple.

RTDs have wire winding or thin-ﬁ lm serpentine

elements that exhibit changes in resistance with

changes in temperature. Thermistors, typically

made of ceramic or polymer material, also exhibit

signiﬁ cant changes in resistance with changes

in temperature. Thermocouples consist of two

dissimilar metal wires welded together to form

two junctions. Temperature differences between

the junctions cause a thermoelectric potential (i.e.,

a voltage) between the two wires. Holding the

reference junction at a known temperature and

measuring this voltage permits the temperature

of the sensing junction to be deduced. A constant

and linear excitation source is a critical aspect

of RTD/thermistor sensing, while cold junction

compensation is the key to a good temperature

measurement with thermocouples.

With its high integration, excellent resolution

and accuracy, the ADS1248 offers a single-chip

solution to all of these types of temperature

measurements. The ADS1118 is a lower-cost

solution which has the basic core needed for

any temperature measurement and an extremely

accurate on-chip temperature sensor that is

perfect for accurate cold junction compensation.

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Pressure sensors convert a physical value –

weight, tire pressure, level, force or ﬂ ow – into a

differential signal in the range of millivolts per volt

and use metal thick-ﬁ lm, ceramic thin-ﬁ lm, or

piezoresistive technologies, to name a few. The

majority of designers use the cost-effective

piezosensors that can sense 25 mbar to 25 bar.

However, these sensors are very nonlinear and

temperature-dependent and have a large offset

and large offset drift. They also require attention

to electronic calibration and compensation.

TI’s PGA309 sensor conditioner is an ideal

choice in combination with low-cost piezoresistive

or ceramic thin-ﬁ lm pressure sensors. It is a

complete signal conditioner for bridge sensors

with versatile features that enable linearization,

temperature compensation and digital calibration.

Features and Beneﬁ ts

• Bridge excitation and sensor signal

conditioning

• Sensor error compensation: span, offset

and temperature drifts

• Sensor linearization circuitry

• Digital calibration via one- or two-wire

serial interface

• Low, time-stable total adjusted error

Field Transmitter: Pressure Sensor

Keypad

On/Off

LCD

Display

ADC

Integrated Solution

MCU

4-20mA

4-20

DAC

Power Management

Battery

Powered

Line

Powered

Loop

Powered

Battery

Current

Source

MUX

egrated So

AMP Isolation

Wireless

Antenna

RS-232/RS-485

PROFIBUS

IO-Link

LCD

Backlight

Filtering

Thermocouple

Filtering

RTD

Thermistor

V/I

HART

Field Transmitter: Temperature Sensor

Features and Beneﬁ ts

• Highly integrated solution

– Dual matched-current DACs

– Low-drift internal reference

– Low-noise PGA, temperature sensor,

burnout detection

• 24 bits, no missing codes, single-cycle

settling, up to 2 kSPS

• 50-/60-Hz rejection

+125ºC

+40ºC

Nonlinear

Bridge

Transducer

Pressure

Power Management

Battery

Powered

Line

Powered

Loop

Powered

Battery

Wireless

Antenna

Integrated Solution

Linearization

Circuit VREF

DAC

MUX AMP ADC

TMP

ADC

Cum Cubic Feet

MCU

4-20mA

RS-232/RS-485

PROFIBUS

IO-Link

DAC

HART

Isolation

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Electronic weigh scales, which are found in many

industrial applications, use a load cell as the

primary transducer. Load-cell designs can be

distinguished according to the type of output

signal they generate – pneumatic, hydraulic or

electric. Strain-gauge load cells convert the load

acting on them into electrical signals in the range

of millivolts per volt. A major challenge in

designing weigh scales is that they must sample

multiple load cells while producing extremely low

input referred noise.

Another important factor is the analog circuitry’s

long-term stability with regard to offset drift and

gain. Here the accuracy of the ampliﬁ ed input

signal, either single-ended or differential, must

be guaranteed over years of operation. Hence

the signal chain has to handle the small signals

accurately in the presence of noise in addition

to conditioning for offset, drift, temperature

dependency and other factors.

TI’s ADS1232 is designed as a highly integrated

delta-sigma ADC for low-level, high-precision

measurements, especially for weigh-scale

applications. The device consists of a low-drift,

low-noise instrumentation ampliﬁ er (selectable

gain) and a high-order, chopper-stabilized

modulator followed by a digital ﬁ lter in a

monolithic device. This is a single-chip solution

that can be directly interfaced as a front end to a

load-cell bridge output.

Features and Beneﬁ ts

• Complete front-end solution for weigh

scales

• Very low-noise PGA

• Only 17-nV input-referred noise with gain

of 128

• 23.5 effective bits with gain of 1

• Excellent 50-/60-Hz rejection:

100 dB (min)

Electronic Weigh Scale

Load Cell

LCD

Backlight

RS-232

RS-485

Ethernet

Filtering

ADC

AMP

Battery

Powered

Line

Powered

Power Management

Adapter

AC Line

Plug

Integrated ADC

Solution MCU

VREF

Wireless

The electromagnetic ﬂ owmeter consists of a

nonferromagnetic tube wrapped with a magnetic

coil. Electrodes in the tube’s inner isolated surface

are in contact with a conductive liquid that ﬂ ows

through the tube. The coils around the pipe

generate a magnetic ﬁ eld within the tube. The

magnetic ﬁ eld inducts a voltage in the liquid that

is proportional to the speed of the liquid in the

tube. This voltage is measured via the electrodes.

Because the measured voltage is very low, precise

low-noise signal conditioning is required.

Coriolis ﬂ owmeter is a popular ﬂ owmeter

that directly measures mass ﬂ ow rate. Applying a

strong magnetic ﬁ eld to a pipe through which ﬂ uid

is ﬂ owing makes the pipe oscillate at a particular

resonant frequency. When the ﬂ uid starts ﬂ owing

through the pipe, it is subject to Coriolis force.

The oscillatory motion of the pipe superimposes

on the linear motion of the ﬂ uid, exerting twisting

forces on the pipe. This twisting is due to Coriolis

acceleration acting in opposite directions on either

side of the pipe and to the ﬂ uid’s resistance to

the vertical motion. Sensor electrodes placed on

both the inlet and outlet sides pick up the phase

difference caused by this motion. This phase shift

due to the twisting forces is a direct measurement

of mass ﬂ ow rate.

Low-noise instrumentation ampliﬁ ers followed

by precision ADCs is typical of the signal-chain

path. Precision DACs or PWM drivers are used to

excite the ﬁ eld coils. Multiple-channel ADCs with

simultaneous sampling architectures make it

possible to take multiple measurements such as

temperature, phase, density, etc. at the same time.

TI’s ADS1274, which is a 24-bit, 4-channel,

simultaneous-sampling delta-sigma converter

with up to 144 kSPS, is the perfect front end for

ﬂ owmeters requiring multiple measurements

(Coriolis). The ADS1259 is a high-linearity, low-

drift, 24-bit, delta-sigma converter commonly used

in electromagnetic ﬂ owmeters.

Features and Beneﬁ ts

• Multiple channels and simultaneous

sampling for measuring multiple process

variables at the same time

• Excellent AC and DC performance

• Selectable operating modes: High speed,

high resolution, low power

Flowmeters: Electromagnetic/Coriolis

IO-Link

Processor

Power Management

ADC

Driver

The Magnetic-Inductive Flowmeter

Driver

The Coriolis Flowmeter

Isolation

PROFIBUS

RS-232/RS-485

Wireless

4-20mA

DAC

HART

Isolation

Line

Powered

Loop

Powered

IO-Link

PROFIBUS

RS-232/RS-485

Wireless

4-20mA

DAC

HART

Flow

SLYB177B

Important Notice: The products and services of Texas Instruments Incorporated and its subsidiaries described herein are sold subject to TI’s standard terms and conditions of sale. Customers

are advised to obtain the most current and complete information about TI products and services before placing orders. TI assumes no liability for applications assistance, customer’s applications

or product designs, software performance, or infringement of patents. The publication of information regarding any other company’s products or services does not constitute TI’s approval,

warranty or endorsement thereof.

The platform bar, C5000 and MSP430 are trademarks of Texas Instruments. ZigBee is a registered trademark of the ZigBee Alliance. All other trademarks are the property of their respective owners.

Function Features Part Number EVM/Demo

High-Precision

Instrumentation Ampliﬁ er

Micropower (50 A), zero drift, low offset voltage (25 µV max), low offset drift 0.1 µV/°C),

rail-to-rail output instrumentation ampliﬁ er

INA333

Complete Pressure/

Bridge Sensor Conditioner

Ampliﬁ cation, bridge excitation, digital calibration (for span, offset and temperature drift),

linearization, temperature compensation

PGA309 PGA309EVM-USB

Single-Chip Temperature-

Measurement Front End

High integration, low-noise PGA, 24-bit ADC, internal reference, dual-current DACs, temperature

sensor, burnout detection

ADS1248 ADS1248EVM/

ADS1248EVM-PDK

Integrated Single-Chip

Temperature Measurement

Front End

High accuracy on-chip temp sensor for CJC.

World’s smallest 16-bit ADC as of 2011Q3.

Integrated PGA for better utilization of dynamic range. Low power.

ADS1118 ADS1118EVM

Weigh-Scale Front End High integration, 24-bit precision ADC, on-board PGA, temperature sensor ADS1232 ADS1232EVM

Flowmeter Signal

Acquisition

Quad-channel simultaneous sampling, 144 kSPS, 24-bit ADC ADS1274 ADS1274EVM/

ADS1274EVM-PDK

DAC 12-bit, single-channel, 80 µA, 1.8-V to 5.5-V DAC in SC-70 package, can be used to drive HART signal DAC7311 DAC7311EVM

Ultra-Low Power MCU Ultra-low power, industrial feature set, 5V tol. I/O, high-resolution timer, stand-by in LPM3: 1.1 µA MSP430F51x2 MSP-TS430RSB40

Ultra-Low Power MCU Ultra-low power, universal memory, ADC10, active mode: 107 µA/MHz at 8 MHz MSP430FR5739 MSP-EXP430FR5739

IO-Link MCU Ultra-low power, 32-KB Flash, 1-KB RAM, IO-Link stack V1.1 (TMG) MSP430F2274 MSP-FET430U38

Low-Power DSP Industry’s lowest-powered DSP, energy-efﬁ cient FFT hardware accelerator,

standby mode <0.15 mW, active mode < 0.15 mW/MHz, dynamic voltage a frequency scaling

TMS320C5515 TMDXEVM5515

4–20-mA Transmitter Low Iq, Vregulator, Vref for sensor excitation, low span and non-linearity error XTR115 XTR115EVM

PROFIBUS 4-KV peak-isolated PROFIBUS transceiver with low bus capacitance and bus-pin ESD protection IS01176 ISO1176EVM

IO-Link PHY IO-Link device node PHY with overcurrent/overvoltage/overtemperature protection, small footprint

4 mm × 4 mm QFN-20 package, internal voltage regulator

SN65HVD101

RS-485 4-KV peak-isolated, 5-V, full-duplex RS-485 transceiver ISO3080 ISO485EVM

Wireless Transceiver 2.4-GHz 802.15.4/ZigBee® RF transceiver, excellent link budget (103 dBm), 400-m line of sight,

extended temperature (–40 to +125°C)

CC2520 CC2520DK

Linear Regulator -3-V to -36-V input, -200-mA, ultra-low noise, high PSRR, low-dropout linear regulator TPS7A3001 TPS7A30-49EVM-567

Linear Regulator 100-V input, 50-mA, single-output low-dropout linear regulator TPS7A4001 TPS7A4001EVM-709

Isolated Regulator 0.95-V to 6-V Input, 2-W isolated DC/DC converter with integrated FETs TPS55010 TPS55010EVM-009

Isolated Regulator 5-/12-/24-V input, 1-W isolated regulated DC/DC converter modules DCR01

DC/DC Converter 4.5- to 60-V input, 50-mA synchronous buck converter TPS54062 TPS54062EVM-695

DC/DC Converter 3.5- to 60-V input, 1.5-A DC/DC converter with light load efﬁ ciency and low IqTPS54160 TPS54160EVM-230

Power Management

Industrial ﬁ eld transmitters could be powered in

one of three ways: loop, line or battery.

Texas Instruments (TI) offers a complete line of

high-performance power management products

designed for industrial applications. The devices

shown are well-suited for powering sensors that

may require low noise and high efﬁ ciency in both

line- and loop-powered (4–20 mA) topologies. Many

TI DC/DC converters feature current-mode control

with fast dynamic response and a pulse skipping

eco-mode with low quiescent current which

saves energy at light loads. Battery-powered

transmitters can be designed using TI’s low-power

Buck and Buck-Boost converters.

Processor and Connectivity

The MSP430™ MCU, with its integrated analog

peripherals, is the perfect platform for designers

looking to implement calibration routines,

compensation algorithms, etc. The computing

power and rich peripherals set accented by ultra-

low power consumption, makes the MSP430

MCU the universal choice for sensor design.

For ﬂ owmeter applications which require more

signal processing than offered by a standard MCU,

the C5000™ platform of DSPs is the optimal

solution. The C5000 DSP has an FFT accelerator

core that enables computing FFTs in a matter

of seconds while drawing very little current. The

ultra-low-power architecture of the C5000 DSP

offers superior signal-processing power while still

being able to be powered off the 4–20-mA loop.

Traditional analog (4–20 mA) interface remains

the popular choice for industrial control and

sensor applications. The other popular protocols

include HART, PROFIBUS and IO-Link. TI’s IO-Link

interface products have integrated regulators

and diagnostic outputs. In addition, wireless

options based on IEEE 802.15.4 protocols are

becoming more prevalent. TI is committed to

provide solutions for both traditional and emerging

industrial interfaces.

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Industrial Automation Solutions

Sensors and Field Transmitters portfolio at a glance