HVAC System Technology
Today’s sophisticated buildings require HVAC systems technologies with unprecedented levels of energy efficiency, safety, and comfort. To obtain peak operating performance in all these areas simultaneously requires a complex, reliable network of monitoring/control systems and accurate sensors. Analog Devices can meet these sophisticated HVAC system technology requirements by delivering proven, high-performance, reliable, signal processing solutions.
Data created in HVAC systems needs to connect securely into building management systems to optimize its utilization efficiency. Sensors in HVAC systems can measure the flow and temperatures of air to enhance the system performance. Additional insights on operation efficiencies can be derived using condition-based monitoring solutions that provide information on operation and predictive maintenance.
Value and Benefits
Single-pair Ethernet lets you securely collect more data than legacy communications while using existing installed wiring, allowing for faster unlocking of advanced building control algorithms. Efficient actuator controls work silently while providing real-time feedback to flag small issues before they turn into large ones.
Secure data collection
Enable real-time feedback
Unlocking algorithms quickly
Featured Products
AD5700
The AD5700/AD5700-1 are single-chip solutions, designed and specified to operate as a HART® FSK half-duplex modem, complying with the HART physical layer requirements. The AD5700/AD5700-1 integrate all of the necessary filtering, signal detection, modulating, demodulating and signal generation functions, thus requiring few external components. The 0.5% precision internal oscillator on the AD5700-1 greatly reduces the board space requirements, making it ideal for line-powered applications in both master and slave configurations. The maximum supply current consumption is 115µA, making theAD5700/AD5700-1 an optimal choice for low power loop-powered applications. Transmit waveforms are phase continuous 1200 Hz and 2200 Hz sinusoids. The AD5700/AD5700-1 contain accurate carrier detect circuitry and use a standard UART interface.
Applications
- Field transmitters
- HART multiplexers
- PLC and DCS analog I/O modules
- HART network connectivity
Applications
Wireless Communication Solutions
- E-Band Radio
Intelligent Building Solutions
- Smart Building Automation Systems
- Building Automation Controllers and Network Solutions
- Environmental Building Monitoring Solutions
- HVAC System Technology
Industrial Automation Technology (IAT)
- Programmable Logic Controllers (PLC) and Distributed Control Systems (DCS)
- Temperature Controllers
- Field Instrument Systems
ADSW4000
The ADSW4000 ADI EagleEye™ PeopleCount algorithm enables a people counting function within internal spaces, such as meeting rooms or office spaces. The system edge node analytics unlocks informed insights and analytics with an accurate and secure people counting capability. This data can provide the insight to improve asset and people management, social distancing, security, employee engagement, space utilization, labor productivity, and energy efficiency.
The ADSW4000 is designed to operate solely with the Analog Devices, Inc., ADSP-BF707 Blackfin+® core embedded processor (ADSPBF707BBCZ4-EGE) and is optimized for a CMOS 2D video graphics array (VGA) sensor and lens (the recommended Chicony CYFI013 module incorporates an ON Semiconductor® ASX340AT3C00XPED0-DPBR CMOS image sensor, Chicony YT70005 lens, and lens holder with infrared (IR) filter).
The ADSW4000 ADI EagleEye™ PeopleCount algorithm provides up to a 90% accurate people count within the target area.
The following are the accuracies achieved for tested radii from 3 m to 5 m:
- 90% accuracy in 3 m radius
- 85% accuracy in 4 m radius
- 80% accuracy in 5 m radius
APPLICATIONS
- Building technology solutions
- Intelligent buildings
- Occupancy analytics
- Building management systems
Applications
Intelligent Building Solutions
- Building Lighting Technology Solutions
- HVAC System Technology
- Building Fire Safety and Surveillance Solutions
ADT7320
The ADT7320 is a high accuracy digital temperature sensor that offers breakthrough performance over a wide industrial temperature range, housed in a 4 mm × 4 mm LFCSP package. It contains an internal band gap reference, a temperature sensor, and a 16-bit analog-to-digital converter (ADC) to monitor and digitize the temperature to a resolution of 0.0078°C. The ADC resolution, by default, is set to 13 bits (0.0625°C). The ADC resolution is a user programmable mode that can be changed through the serial interface.
The ADT7320 is guaranteed to operate over supply voltages from 2.7 V to 5.5 V. Operating at 3.3 V, the average supply current is typically 210 μA. The ADT7320 has a shutdown mode that powers down the device and offers a shutdown current of typically 2.0 μA at 3.3 V. The ADT7320 is rated for operation over the −40°C to +150°C temperature range.
The CT pin is an open-drain output that becomes active when the temperature exceeds a programmable critical temperature limit. The INT pin is also an open-drain output that becomes active when the temperature exceeds a programmable limit. The INT pin and CT pin can operate in either comparator or interrupt mode.
PRODUCT HIGHLIGHTS
- Ease of use, no calibration or correction required by the user.
- Low power consumption.
- Excellent long term stability and reliability.
- High accuracy for industrial, instrumentation, and medical applications.
- Packaged in a 16-lead RoHS-compliant, 4 mm x 4 mm LFCSP package.
APPLICATIONS
- RTD and thermistor replacement
- Thermocouple cold junction compensation
- Medical equipment
- Industrial controls and test
- Food transportation and storage
- Environmental monitoring and HVAC
- Laser diode temperature controls
Applications
Industrial Automation Technology (IAT)
- Position Encoder Systems
- Programmable Logic Controllers (PLC) and Distributed Control Systems (DCS)
- Temperature Controllers
- Field Instrument Systems
Wireless Communication Solutions
- E-Band Radio
Intelligent Building Solutions
- Building Automation Controllers and Network Solutions
- Smart Building Automation Systems
- Smart Building Sustainability Solutions
- Environmental Building Monitoring Solutions
- Smart Building Utilities Solutions
- HVAC System Technology
Healthcare Solutions
- In Vitro Diagnostic Solutions
- Life Sciences & Medical Instrumentation
- Therapy Device Solutions for Healthcare
- Computed Tomography Solutions
- Vital Signs Monitoring Solutions
- Electrocardiogram (ECG) Measurement Solutions
- Electroencephalogram (EEG) Measurement Solutions
- Non-Invasive Blood Pressure (NIBP) Solutions
- Respiration Rate Measurement Solutions
- Oxygen Saturation (SpO2) Measurement Solutions
- Body Composition, Hydration, and Bioimpedance Analysis Solutions
- Insulin Pump Solutions
- Activity Tracking and Fall Detection Solutions
- Wearable Health Monitor Solutions
- Body Temperature Measurement Solutions
Instrumentation and Measurement Solutions
- Analytical Instruments
Sensor Interface Solutions
- Temperature Sensing Solutions
Temperature Sensing Solutions
- Thermocouple
- Silicon-Based
ADuCM4050
The ADuCM4050 microcontroller unit (MCU) is an ultra low power integrated microcontroller system with integrated power management for processing, control, and connectivity. The MCU system is based on the ARM® Cortex®-M4F processor. The MCU also has a collection of digital peripherals, embedded static random access memory (SRAM) and embedded flash memory, and an analog subsystem that provides clocking, reset, and power management capabilities in addition to an analog-to-digital converter (ADC) subsystem.
This data sheet describes the ARM Cortex-M4F core and memory architecture used on the ADuCM4050 MCU. It does not provide detailed programming information about the ARM processor.
The system features include an up to 52 MHz ARM Cortex-M4F processor, 512 kB of embedded flash memory with error correction code (ECC), an optional 4 kB cache for lower active power, and 128 kB system SRAM with parity. The ADuCM4050 features a power management unit (PMU), multilayer advanced microcontroller bus architecture (AMBA) bus matrix, central direct memory access (DMA) controller, and beeper interface.
The ADuCM4050 features cryptographic hardware supporting advanced encryption standard (AES)-128 and AES-256 with secure hash algorithm (SHA)-256 and the following modes: electronic code book (ECB), cipher block chaining (CBC), counter (CTR), and cipher block chaining-message authentication code (CCM/CCM*) modes.
The ADuCM4050 has protected key storage with key wrap/ unwrap, and keyed hashed message authentication code (HMAC) with key unwrap.
The ADuCM4050 supports serial port (SPORT), serial peripheral interface (SPI), I2C, and universal asynchronous receiver/ transmitter (UART) peripheral interfaces.
The ADuCM4050 features a real-time clock (RTC), general-purpose and watchdog timers, and programmable general-purpose input/output (GPIO) pins. There is a hardware cyclic redundancy check (CRC) calculator with programmable generator polynomial. The device also features a power on reset (POR) and power supply monitor (PSM), a 12-bit successive approximation register (SAR) ADC, a red/green/blue (RGB) timer for driving RGB LED, and a true random number generator (TRNG).
To support low dynamic and hibernate power management, the ADuCM4050 MCU provides a collection of power modes and features such as dynamic- and software-controlled clock gating and power gating.
For full details on the ADuCM4050 MCU, refer to the ADuCM4050 Ultra Low Power ARM Cortex-M4F MCU with Integrated Power Management Hardware Reference.
Product Highlights
- Ultra low power consumption.
- Robust operation.
- Full voltage monitoring in deep sleep modes.
- ECC support on flash.
- Parity error detection on SRAM memory.
- Leading edge security.
- Fast encryption provides read protection to user algorithms.
- Write protection prevents device reprogramming by unauthorized code.
- Failure detection of 32 kHz low frequency external crystal oscillator (LFXTAL) via interrupt.
- SensorStrobe™ for precise time synchronized sampling of external sensors. Works in hibernate mode, resulting in drastic current reduction in system solutions. Current consumption reduces by 10 times when using, for example, the ADXL363 accelerometer. Software intervention is not required after setup. No pulse drift due to software execution.
Applications
- Internet of Things (IoT)
- Smart agriculture, smart building, smart metering, smart city, smart machine, and sensor network
- Wearables
- Fitness and clinical
- Machine learning and neural networks
Applications
Industrial Automation Technology (IAT)
- Field Instrument Systems
- Predictive Maintenance Solutions
- Intelligent Motion Control Solutions
Healthcare Solutions
- Point of Care (PoC) Diagnostic Solutions
- Vital Signs Monitoring Solutions
- Electrocardiogram (ECG) Measurement Solutions
- Electroencephalogram (EEG) Measurement Solutions
- Non-Invasive Blood Pressure (NIBP) Solutions
- Respiration Rate Measurement Solutions
- Oxygen Saturation (SpO2) Measurement Solutions
- Body Composition, Hydration, and Bioimpedance Analysis Solutions
- Insulin Pump Solutions
- Activity Tracking and Fall Detection Solutions
- Wearable Health Monitor Solutions
- Life Sciences & Medical Instrumentation
Intelligent Building Solutions
- Smart Building Automation Systems
- Building Automation Controllers and Network Solutions
- Smart Building Sustainability Solutions
- Environmental Building Monitoring Solutions
- HVAC System Technology
Energy Solutions
- Energy Storage Systems
Internet of Things (IoT)
Signal Chains
(2)
Interactive Signal Chains
Evaluation Boards
EVAL-AD7606B-FMCZ
The EVAL-AD7606BFMCZ is a full featured evaluation board that allows users to easily evaluate the features of the AD7606B analog-to-digital converter (ADC). The EVAL-AD7606BFMCZ can be controlled by the system demonstration platform controller board (EVAL-SDP-CH1Z (SDP-H1)). The EVAL-SDP-CH1Z (SDP-H1) allows the EVAL-AD7606BFMCZ to be controlled through the USB port of a PC using the AD7606B evaluation software. The software is available for download from the AD7606B product page.
On-board components include an ADP7118 5 V, low noise low dropout regulator (LDO) and an ADR4525 high precision, band gap voltage reference.
Full data on the AD7606B is available in the AD7606B data sheet, which must be consulted in conjunction with this user guide. Full details on the EVAL-SDP-CH1Z are available on the SDP-H1 product page.
Applicable Parts
AD7606B
8-Channel DAS with 16-Bit, 800 kSPS Bipolar Input, Simultaneous Sampling ADC
Applications
Wireless Communication Solutions
- E-Band Radio
Instrumentation and Measurement Solutions
- EV High Voltage Drivetrain Test Solutions
- Protocol Analyzer Solutions
- Data Acquisition Solutions
Intelligent Building Solutions
- Smart Building Utilities Solutions
- Building Fire Safety and Surveillance Solutions
- HVAC System Technology
Industrial Automation Technology (IAT)
- Field Instrument Systems
- Temperature Controllers
- Programmable Logic Controllers (PLC) and Distributed Control Systems (DCS)
EVAL-AD7768-1
The EV-AD7768-1FMCZ evaluation kit features the AD7768-1 24-bit, 256 kSPS analog-to-digital converter (ADC). The EVAD7768-1FMCZ board connects to the USB port of the PC via the EVAL-SDP-CH1Z motherboard. By default, power is supplied from the EVAL-SDP-CH1Z supply, which is regulated to 5 V and 3.3 V to supply the AD7768-1 and support components.
The EV-AD7768-1FMCZ software fully configures the AD7768-1 device register functionality and provides dc and ac time domain analysis in the form of waveform graphs, histograms, and associated noise analysis for ADC performance evaluation.
The EV-AD7768-1FMCZ is an evaluation board that allows the user to evaluate the features of the ADC. The user PC software executable controls the AD7768-1 over USB through the system demonstration platform (EVAL-SDP-CH1Z).
Applicable Parts
ADP7182
–28 V, −200 mA, Low Noise, Linear Regulator
ADP7118
20 V, 200 mA, Low Noise, CMOS LDO Linear Regulator
ADA4940-1
Ultralow Power, Low Distortion ADC Driver
ADR4540
Ultra-Low-Noise, High-Accuracy 4.096V Voltage Reference
AD7768-1
DC to 204 kHz, Dynamic Signal Analysis, Precision 24-Bit ADC with Power Scaling
Applications
Automotive Solutions
- Rear Seat Entertainment and Cluster Display Solutions
- Premium Audio Amplifier Solutions
- Advanced Driver Assistance Systems (ADAS) Sensor Fusion ECU Solutions
- Advanced Driver Assistance Systems (ADAS) Camera Solutions
Wireless Communication Solutions
- E-Band Radio
Intelligent Building Solutions
- Surveillance Camera Solutions
- Smart Building Utilities Solutions
- Building Lighting Technology Solutions
- HVAC System Technology
- Smart Building Automation Systems
- Building Automation Controllers and Network Solutions
- Environmental Building Monitoring Solutions
- Building Energy Technology Solutions
- Building Fire Safety and Surveillance Solutions
Instrumentation and Measurement Solutions
- Noise, Vibration, and Harshness (NVH) Automotive Solutions
- Protocol Analyzer Solutions
- Power Circuit Solutions for Instrumentation
- Radio Frequency (RF) and Power Measurement Solutions
- Impedance Measurement and Analysis Solutions
- Parametric Measurement Solutions
- DC Sources and Power Supply Solutions
- Precision Measurement Solutions
- Data Acquisition Solutions
- Analytical Instruments
Industrial Automation Technology (IAT)
- Temperature Controllers
- Programmable Logic Controllers (PLC) and Distributed Control Systems (DCS)
- Predictive Maintenance Solutions
- Field Instrument Systems
Healthcare Solutions
- In Vitro Diagnostic Solutions
- Digital X-Ray Solutions
- Electrocardiogram (ECG) Measurement Solutions
Energy Solutions
- Energy Transmission and Distribution Solutions
- Wind Turbine Solutions
- Power Quality Monitoring Solutions
- Smart Meter Technology
Aerospace and Defense Systems
- Avionic Systems
- Unmanned Aerial Vehicles (UAV)
- Aerospace and Defense Radar Systems
EVAL-ADF7030-1 EZ-KIT
Each ADF7030-1 EZ-KIT allows fast and thorough evaluation of the ADF7030-1 radio and provides a platform for host processor code development using the ADuCM3029 EZ-KIT mother board (ADZS-UCM3029EZLITE).
The ADF7030-1 EZ-KIT consists of the following:
- RF daughter boards.
- Antennae for over the air packet error rate testing.
- ADuCM3029 EZ-KIT mother board and LCD shield for evaluation and development with the ADF7030-1. The ADF7030-1 daughter boards plug into this mother board.
- ADF7030-1 Design Center, a graphical user interface (GUI) for evaluation of the ADF7030-1. The GUI can be used for configuring the ADF7030-1, evaluating transmit and receive operation, and transmitting and receiving packets.
Applicable Parts
ADF7030-1
High Performance, Sub GHz Radio Transceiver IC
Applications
Wireless Communication Solutions
- E-Band Radio
Aerospace and Defense Systems
- Avionic Systems
Intelligent Building Solutions
- Building Automation Controllers and Network Solutions
- Smart Building Utilities Solutions
- Building Lighting Technology Solutions
- HVAC System Technology
- Environmental Building Monitoring Solutions
- Building Energy Technology Solutions
- Building Fire Safety and Surveillance Solutions
Industrial Automation Technology (IAT)
- Temperature Controllers
- Field Instrument Systems
EVAL-ADuCM355
The ADuCM355 on-chip system provides the features needed to bias and to measure a range of different electrochemical sensors. The EVAL-ADuCM355QSPZ allows users to evaluate the performance of the ADuCM355 when implementing a range of different electrochemical techniques, including chronoamperometry, voltammetry, and electrochemical impedance spectroscopy (EIS).
Complete specifications for the ADuCM355 are available in the ADuCM355 data sheet, which must be consulted in conjunction with the EVAL-ADuCM355QSPZ user guide when using the EVAL-ADuCM355QSPZ.
Applicable Parts
Applications
Intelligent Building Solutions
- Building Automation Controllers and Network Solutions
- Environmental Building Monitoring Solutions
- HVAC System Technology
Healthcare Solutions
- Therapy Device Solutions for Healthcare
- Point of Care (PoC) Diagnostic Solutions
- In Vitro Diagnostic Solutions
- Life Sciences & Medical Instrumentation
- Wearable Health Monitor Solutions
- Respiration Rate Measurement Solutions
- Vital Signs Monitoring Solutions
Aerospace and Defense Systems
- Military Communication Solutions
Industrial Automation Technology (IAT)
- Field Instrument Systems
- Temperature Controllers
Instrumentation and Measurement Solutions
- Impedance Measurement and Analysis Solutions
- Precision Measurement Solutions
- Analytical Instruments
- Science Lab Equipment Solutions
- Water and Air Quality Monitoring Solutions
Reference Designs
CN0338
The circuit shown in Figure 1 is a complete thermopile-based gas sensor using the nondispersive infrared (NDIR) principle. This circuit is optimized for CO2 sensing, but can also accurately measure the concentration of a large number of gases by using thermopiles with different optical filters.
The printed circuit board (PCB) is designed in an Arduino shield form factor and interfaces to the EVAL-ADICUP360 Arduino-compatible platform board. The signal conditioning is implemented with the AD8629 and the ADA4528-1 low noise amplifiers and the ADuCM360 precision analog microcontroller, which contains programmable gain amplifiers, dual 24-bit Σ-Δ analog-to-digital converters (ADCs), and an ARM Cortex-M3 processor.
Applicable Parts
AD8629
Zero-Drift, Single-Supply, Rail-to-Rail Input/Output Operational Amplifier
ADA4528-1
Precision, Ultralow Noise, RRIO, Zero-Drift Single Op Amp
ADP7105
20 V, 500 mA, Low Noise LDO Regulator with Soft Start
ADuCM362
Low Power, Precision Analog Microcontroller with Dual Sigma-Delta ADCs, ARM Cortex-M3
ADuCM363
Low Power, Precision Analog Microcontroller with Single Sigma-Delta ADC, ARM Cortex-M3
Applications
Intelligent Building Solutions
- HVAC System Technology
- Environmental Building Monitoring Solutions
Energy Solutions
- Wind Turbine Solutions
- Power Quality Monitoring Solutions
Industrial Automation Technology (IAT)
- Programmable Logic Controllers (PLC) and Distributed Control Systems (DCS)
- Temperature Controllers
- Field Instrument Systems
Instrumentation and Measurement Solutions
- DC Sources and Power Supply Solutions
- Precision Measurement Solutions
- Analytical Instruments
Healthcare Solutions
- Body Temperature Measurement Solutions
- Therapy Device Solutions for Healthcare
- Digital X-Ray Solutions
- Computed Tomography Solutions
- Wearable Health Monitor Solutions
- Insulin Pump Solutions
- Oxygen Saturation (SpO2) Measurement Solutions
- Non-Invasive Blood Pressure (NIBP) Solutions
- Electrocardiogram (ECG) Measurement Solutions
- Life Sciences & Medical Instrumentation
CN0391
The circuit shown in Figure 1 is a flexible, integrated, 4-channel thermocouple measurement system based on the AD7124-8 low power, low noise, precision 24-bit, Σ-Δ analog-to-digital converter (ADC).
The circuit can process up to four independent thermocouple channels, and the software linearization algorithms support eight different types of thermocouples (B, E, J, K, N, R, S, and T). The four thermocouples can be connected in any combination, and resistance temperature detectors (RTDs) on each thermocouple channel provide cold junction compensation (CJC). No extra compensation is needed. Thermocouple measurements using this system cover the full operating range of the various types of thermocouples.
The circuit has a standard serial peripheral interface (SPI) connection to Arduino-compatible platform boards for rapid prototyping. With a USB to UART interface and open source firmware, the EVAL-CN0391-ARDZ can be easily adapted to a variety of thermocouple applications.
Applicable Parts
Applications
Intelligent Building Solutions
- HVAC System Technology
- Environmental Building Monitoring Solutions
Energy Solutions
- Energy Transmission and Distribution Solutions
- Wind Turbine Solutions
- Power Quality Monitoring Solutions
- Smart Meter Technology
Aerospace and Defense Systems
- Aerospace and Defense Radar Systems
- Avionic Systems
Instrumentation and Measurement Solutions
- Impedance Measurement and Analysis Solutions
- Parametric Measurement Solutions
- DC Sources and Power Supply Solutions
- Precision Measurement Solutions
- Analytical Instruments
- Data Acquisition Solutions
- Electronic Test and Measurement Solutions
Industrial Automation Technology (IAT)
- Programmable Logic Controllers (PLC) and Distributed Control Systems (DCS)
- Predictive Maintenance Solutions
- Field Instrument Systems
- Temperature Controllers
CN0395
The circuit shown in Figure 1 measures indoor air quality by using a metal-oxide sensor to detect gases composed of volatile organic compounds. The sensor is composed of a heating resistor and a sensing resistor. When the sense resistor is heated, its value changes as a function of the concentrations of different gases.
The circuit uses a 12-bit, current output digital-to-analog converter (DAC) for precision control of the heater current, and the flexible software allows the heater to operate in one of the following four modes: constant current, constant voltage, constant resistance, and constant temperature.
The circuit is able measure a wide range of sense resistance values by using a software-selectable, five range resistor divider. The board also includes a temperature and humidity sensor that is used for compensating the gas concentration value.
Applicable Parts
AD7988-1
16-Bit Lower Power PulSAR ADCs in MSOP/LFCSP
ADN8810
12-Bit High Output Current Source
AD8628
Zero-Drift, Single-Supply, Rail-to-Rail Input/Output Operational Amplifier
ADG884
0.5 Ω CMOS Dual 2:1 MUX/SPDT Audio Switch
ADG758
CMOS Low Voltage, 3 Ω 8-Channel Multiplexer
ADP196
5 V, 3 A Logic Controlled High-Side Power Switch
ADP124
5.5V Input, 500 mA, Low Quiescent Current, CMOS Linear Regulator with 31 Fixed-output Voltages
ADR4540
Ultra-Low-Noise, High-Accuracy 4.096V Voltage Reference
Applications
Intelligent Building Solutions
- HVAC System Technology
- Environmental Building Monitoring Solutions
Instrumentation and Measurement Solutions
- Impedance Measurement and Analysis Solutions
- Data Acquisition Solutions
- Analytical Instruments
Healthcare Solutions
- Body Temperature Measurement Solutions
- Therapy Device Solutions for Healthcare
- Digital X-Ray Solutions
- Respiration Rate Measurement Solutions
- Electrocardiogram (ECG) Measurement Solutions
- Life Sciences & Medical Instrumentation
Industrial Automation Technology (IAT)
- Programmable Logic Controllers (PLC) and Distributed Control Systems (DCS)
- Temperature Controllers
- Field Instrument Systems
CN0396
The circuit shown in Figure 1 is a portable gas detector, using a 4-electrode electrochemical sensor, for simultaneous detection of two distinct gases. The potentiostatic circuit uses an optimum combination of components designed to provide single-supply, low power, and low noise performance, while offering a high degree of programmability to accommodate a variety of sensors for different types of gases.
Electrochemical sensors offer several advantages for instruments that detect or measure the concentration of many toxic gases. Most sensors are gas specific and have usable resolutions under one part per million (ppm) of gas concentration.
The Alphasense COH-A2 sensor, which detects carbon monoxide (CO) and hydrogen sulfide (H2S), is used in this example.
The EVAL-CN0396-ARDZ printed circuit board (PCB) is designed in an Arduino-compatible shield form factor and interfaces to the EVAL-ADICUP360 Arduino-compatible platform board for rapid prototyping.
Applicable Parts
AD7798
3-Channel, Low Noise, Low Power, 16-Bit, Sigma Delta ADC with On-Chip In-Amp
ADA4528-1
Precision, Ultralow Noise, RRIO, Zero-Drift Single Op Amp
ADA4528-2
Precision, Ultralow Noise, RRIO, Zero-Drift Dual Op Amp
AD5270
1024-Position, 1% Resistor Tolerance Error, SPI Interface and 50-TP Memory Digital Rheostat
ADT7310
±0.5°C Accurate, 16-Bit Digital SPI Temperature Sensor
ADP7102
20 V, 300 mA, Low Noise, CMOS LDO
ADR3412
Micro-Power, High-Accuracy 1.2V Voltage Reference.
Applications
Intelligent Building Solutions
- HVAC System Technology
- Environmental Building Monitoring Solutions
Energy Solutions
- Wind Turbine Solutions
Instrumentation and Measurement Solutions
- Precision Measurement Solutions
- Analytical Instruments
- Electronic Test and Measurement Solutions
Healthcare Solutions
- Body Temperature Measurement Solutions
- Therapy Device Solutions for Healthcare
- Computed Tomography Solutions
- Insulin Pump Solutions
- Life Sciences & Medical Instrumentation
Industrial Automation Technology (IAT)
- Programmable Logic Controllers (PLC) and Distributed Control Systems (DCS)
- Field Instrument Systems
- Temperature Controllers
Aerospace and Defense Systems
- Avionic Systems
- Unmanned Aerial Vehicles (UAV)
CN0425
Toxic gas detection instruments are widely used to alert people of elevated levels of dangerous gases. Many of these instruments use electrochemical gas sensors that contain multiple metal plates, metal pins, and internal metal-based bond wires. These metal components can make the sensor susceptible to picking up energy from nearby RF communication networks, which may result in the instrument reporting an incorrect gas level or even a false gas alarm. An unnecessary workplace evacuation or factory shutdown due to a false alarm can be very costly to an end user.
The European standard EN 50270: 2015, “Electrochemical compatibility – Electrical apparatus for the detection and measurement of combustible gases, toxic gases or Oxygen” specifies the RF frequency range and power levels that a toxic gas detection instrument must be capable of operating in.
The CN-0425 circuit was extensively tested with a number of sensors in an anechoic chamber to prove compliance with the EN 50270 radiated immunity specifications. Additional tests were performed in close proximity to a high power radio transmitter to prove its robustness to near-field RF interference.
Figure 1 shows an electrochemical gas sensor (M1) connected and how to bias and measure the electrochemical toxic gas sensor. This circuit note also shows and explains the filters used to improve radiated immunity of the whole circuit.
Applicable Parts
Applications
Intelligent Building Solutions
- HVAC System Technology
- Environmental Building Monitoring Solutions
- Smart Building Automation Systems
Instrumentation and Measurement Solutions
- Analytical Instruments
- Impedance Measurement and Analysis Solutions
Temperature Sensing Solutions
- Digital Temperature Sensors
Sensor Interface Solutions
- Temperature Sensing Solutions
Training and Support
Trainings and Tutorials
Video
Jan 29, 2021
02:43CN0549 - CbM Development Platform
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