参数资料
| 型号： | EVAL-CN0271-SDPZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 1/5页 |
| 文件大小： | 0K |
| 描述： | EVAL SYSTEM FOR CN0271 |
| 设计资源： | EVAL-CN0271-SDPZ Assy Drawing EVAL-CN0271-SDPZ Pads Layout-Color EVAL-CN0271-SDPZ Pads Layout EVAL-CN0271-SDPZ Schematic |
| 标准包装： | 1 |
| 系列： | * |
Circuit Note
CN-0271
Devices Connected/Referenced
Circuits from the Lab? reference circuits are engineered and
tested for quick and easy system integration to help solve today’s AD8476
analog, mixed-signal, and RF design challenges. For more
Full K-Type Range 0°C to 50°C Thermocouple
Amplifier with Cold Junction Compensation
Low Power, Unity-Gain Fully Differential
Amplifier and ADC Driver
information and/or support, visit www.analog.com/CN0271 .
16-Bit, Single-Channel, Ultralow Power, Sigma-
Delta ADC
Ultralow Noise, 2.5 V, LDO, XFET Voltage
Reference with Current Sink and Source
Thermocouple Temperature Measurement System with Amplifier-Based Cold
Junction Compensation
EVALUATION AND DESIGN SUPPORT
Circuit Evaluation Boards
Design and Integration Files
CIRCUIT FUNCTION AND BENEFITS
The circuit shown in Figure 1 is a complete thermocouple signal
conditioning circuit with cold junction compensation followed
by a 16-bit sigma-delta (Σ-Δ) analog-to-digital converter (ADC).
The AD8495 thermocouple amplifier provides a simple, low cost
solution for measuring K type thermocouple temperatures,
including cold junction compensation.
A fixed gain instrumentation amplifier in the AD8495 amplifies
the small thermocouple voltage to provide a 5 mV/°C output. The
high common-mode rejection of the amplifier blocks common-
mode noise that the long thermocouple leads can pick up. For
additional protection, the high impedance inputs of the amplifier
make it easy to add extra filtering.
The AD8476 differential amplifier provides the correct signal levels
and common-mode voltage to drive the AD7790 16-bit, Σ-Δ ADC.
The circuit provides a compact low cost solution for thermocouple
signal conditioning and high resolution analog-to-digital
conversion.
+5V
+5V
+5V
+2.5V
ADR441
VIN VOUT
+2.5V
0.1μF
10μF
+5V
10μF
0.1μF
0.1μF
GND
+V S
+V S
COLD
JUNCTION
10k?
V DD
V DD
REFIN
INTERNAL
CLOCK
0.01μF
COMPENSATION
SENSE
INP 10k?
–OUT
0.01μF
100?
THERMO-
COUPLE
1.0μF
IN-AMP
OUT
+2.5V 10k?
AD8476
100?
1.0μF
BUF
16-BIT
ADC
DIGITAL
PGA
SERIAL
INTERFACE
1M?
100?
0.01μF
REF
AD8495
–V S
INN
49.9k?
+OUT
10k?
100?
0.01μF
GND
GND
AD7790
–V S
Figure 1. K-Type Thermocouple Measurement System with Integrated Cold Junction Compensation (Simplified Schematic: All Connections Not Shown)
Rev. B
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)
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 www.analog.com
Fax: 781.461.3113 ?2012–2013 Analog Devices, Inc. All rights reserved.
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