EVAL-CN0209-SDPZ Analog Devices Inc, EVAL-CN0209-SDPZ Datasheet

EVAL-CN0209-SDPZ

Manufacturer Part Number

EVAL-CN0209-SDPZ

Description

EVAL CIRCUIT BOARD

Manufacturer

Analog Devices Inc

Series

-r

Datasheet

1.EVAL-CN0209-SDPZ.pdf (5 pages)

Specifications of EVAL-CN0209-SDPZ

Main Purpose

Interface, Analog Front End (AFE)

Embedded

Utilized Ic / Part

AD7193, AD8275, AD8617, AD8676, ADG1414, ADG442, ADP1720, ADT7310, ADuM1400, ADuM1401, REF194

Primary Attributes

Secondary Attributes

Lead Free Status / Rohs Status

Lead free / RoHS Compliant

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EVALUATION AND DESIGN SUPPORT

Circuit Evaluation Boards

Design and Integration Files

CIRCUIT FUNCTION AND BENEFITS

The circuit shown in Figure 1 provides a fully programmable

universal analog front end (AFE) for process control

applications. The following inputs are supported: 2-, 3-, and 4-

wire RTD configurations, thermocouple inputs with cold

junction compensation, unipolar and bipolar input voltages,

and 4 mA-to-20 mA inputs.

Today, many analog input modules use wire links (jumpers) to

configure the customer input requirements. This requires time,

knowledge, and manual intervention to configure and

reconfigure the input. This circuit provides a software

controllable switch to configure the modes along with a

constant current source to excite the RTD. The circuit is also

reconfigurable to set common-mode voltages for the

condition the analog input voltage range to the Σ-Δ ADC. The

thermocouple configuration. A differential amplifier is used to

circuit provides industry-leading performance and cost.

Because of the voltage gain provided by the

AD8275, the design is particularly suitable for small signal

inputs, all types of RTDs, or thermocouples.

The

have four differential inputs or eight pseudo differential inputs.

The

signal isolation between the microcontroller and the ADC.

The circuit also includes standard external protection and

is compliant with the IEC 61000 specifications.

Rev.0

Circuits from the Lab™ circuits from Analog Devices have been designed and built by Analog Devices

engineers. Standard engineering practices have been employed in the design and construction of

each circuit, and their function and performance have been tested and verified in a lab environment at

room temperature. However, you are solely responsible for testing the circuit and determining its

suitability and applicability for your use and application. Accordingly, in no event shall Analog Devices

be liable for direct, indirect, special, incidental, consequential or punitive damages due to any cause

whatsoever connected to the use of any Circuits from the Lab circuits. (Continued on last page)

CN-0209 Circuit Evaluation Board (EVAL-CN0209-SDPZ)

System Demonstration Platform (EVAL-SDP-CB1Z)

Schematics, Layout Files, Bill of Materials

AD7193

ADuM1400

is a 24-bit Σ-Δ ADC that can be configured to

and

ADuM1401

Circuits from the Lab™ reference

circuits are engineered and tested

for quick and easy system

integration to help solve today’s

analog, mixed-signal, and RF

design challenges. For more

information and/or support, visit

www.analog.com/CN0209.

Fully Programmable Universal Analog Front End

provide all the necessary

for Process Control Applications

AD8676

and

ADP1720

AD8275

REF194

AD8617

ADT7310

ADG1414

Devices Connected/Referenced

High Voltage, Low Dropout Linear Regulator

G = 0.2, Level Translation ADC Driver

Precision, 4.5 V Voltage Reference

Low Noise, Rail-to-Rail Input/Output Amp

16-Bit Digital Temperature Sensor

Serially-Controlled Octal SPST Switches

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

Fax: 781.461.3113

CIRCUIT DESCRIPTION

This circuit provides a fully programmable universal analog

front end (AFE) for process control applications supporting

2-, 3-, and 4-wire RTD configurations, thermocouple inputs

with cold junction compensation, unipolar and bipolar input

voltages, and 4 mA-to-20 mA inputs as shown in the

configuration diagram of Figure 2.

The ADG1414, a serially controlled octal SPST switch, is used

to configure the selected measurement mode.

Voltage Measurement

This circuit supports the measurement of unipolar and bipolar

signal ranges up to ±10 V. The input signal goes through a

signal conditioning stage before conversion by the AD7193

ADC. The AD8676 amplifier buffers the inputs before the gain

stage. The AD8275 is used to level shift the input signal and

provides gain so that it matches the input range of the AD7193.

The AD8275 output is biased with a common-mode voltage

connected to its REF pin. This voltage is generated by the

REF194

RTD Measurement

As shown in the connection table, this circuit supports 2-, 3-, and

4-wire RTD configurations. In this case, the transducer is a

1000 Ω platinum (Pt) RTD (resistive temperature device). The

most accurate arrangement is a 4-lead RTD configuration. In

the application shown, an external 200 µA current source

provides the excitation current for the RTD, and the AD7193 is

operated at gain of 16 to maximize the dynamic range in the

circuit. The

when the RTD measurement mode is selected. It is reconfigured

in closed-loop to set the common-mode voltage when the

thermocouple measurement is selected. The AD8617 is a dual

low noise amplifier so that it can drive both input channels

precision 4.5 V reference.

AD8617

amplifier is configured as a current source

ADG442

AD8676

AD7193

ADuM1400

ADuM1401

Circuit Note

Quad-Channel Digital Isolator

Dual, Rail-to-Rail Output Op Amp

24-Bit Σ-Δ ADC

Quad-Channel Digital Isolator

MOS Quad SPST Switches

www.analog.com

CN-0209

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EVAL-CN0209-SDPZ Summary of contents

Page 1

... Fully Programmable Universal Analog Front End EVALUATION AND DESIGN SUPPORT Circuit Evaluation Boards CN-0209 Circuit Evaluation Board (EVAL-CN0209-SDPZ) System Demonstration Platform (EVAL-SDP-CB1Z) Design and Integration Files Schematics, Layout Files, Bill of Materials CIRCUIT FUNCTION AND BENEFITS The circuit shown in Figure 1 provides a fully programmable universal analog front end (AFE) for process control applications ...

Page 2

CN-0209 0.1uF 10uF 0.1uF 10uF 1&2 CURRENT 0.1uF 0.1uF 10uF 10uF SUPPLY Figure 1. Universal Programmable Analog Front End for Process Control Applications (Simplified Schematic: All Connections and Decoupling Not Shown) MICROCONTROLLER 0.1uF L CHANNE 11.5k 11. CHANNE ...

Page 3

Circuit Note RTD 2 WIRES RTD JX-1 JX-2 JX-3 JX JX-2 JX-3 JX-3 JX-4 available on the board. The resistor configuring the current source must have a low temperature coefficient to avoid drift errors in the measurement circuit. ...

Page 4

... Figure 3. Noise Distribution Histogram,1000 Samples AD7193 50 Hz Data Rate, Gain = 1, Input = 4.5 V Reference CIRCUIT EVALUATION AND TEST This circuit uses the EVAL-CN0209-SDPZ circuit board and the EVAL-SDP-CB1Z System Demonstration Platform (SDP) evaluation board. The two boards have 120-pin mating connectors, allowing for the quick setup and evaluation of the circuit’ ...

Page 5

... MT-031 Tutorial, Grounding Data Converters and Solving the Mystery of “AGND” and “DGND”, Analog Devices. MT-101 Tutorial, Decoupling Techniques, Analog Devices. Sensor Signal Conditioning, Analog Devices, 1999, Section 7. Data Sheets and Evaluation Boards ADuM1400 Data Sheet ADuM1401 Data Sheet AD7193 Data Sheet ...

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