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| resources:eval:user-guides:eval-adicup360:hardware:cn0357 [15 Nov 2016 04:18] – formatting correction JB Chua | resources:eval:user-guides:eval-adicup360:hardware:cn0357 [03 Jan 2021 21:46] (current) – fix links Robin Getz |
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| [[ADI>CN0357]] single-supply, low noise, portable gas detector circuit using an electrochemical sensor. The Alphasense CO-AX carbon monoxide sensor is used in this example. 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. | [[ADI>CN0357]] single-supply, low noise, portable gas detector circuit using an electrochemical sensor. The Alphasense CO-AX carbon monoxide sensor is used in this example. 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. |
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| The circuit shown in below uses the [[http://www.analog.com/ADA4528-2|ADA4528-2]], dual auto zero amplifier, which has a maximum offset voltage of 2.5 µV at room temperature and an industry leading 5.6 µV/√Hz of voltage noise density. In addition, the [[http://www.analog.com/AD5270|AD5270-20]] programmable rheostat is used rather than a fixed transimpedance resistor, allowing for rapid prototyping of different gas sensor systems, without changing the bill of materials. | The circuit shown in below uses the [[adi>ADA4528-2|ADA4528-2]], dual auto zero amplifier, which has a maximum offset voltage of 2.5 µV at room temperature and an industry leading 5.6 µV/√Hz of voltage noise density. In addition, the [[adi>AD5270|AD5270-20]] programmable rheostat is used rather than a fixed transimpedance resistor, allowing for rapid prototyping of different gas sensor systems, without changing the bill of materials. |
| The [[http://www.analog.com/ADR3412|ADR3412]] precision, low noise, micropower reference establishes the 1.2 V common-mode, pseudo ground reference voltage with 0.1% accuracy and 8 ppm/°C drift. | The [[adi>ADR3412|ADR3412]] precision, low noise, micropower reference establishes the 1.2 V common-mode, pseudo ground reference voltage with 0.1% accuracy and 8 ppm/°C drift. |
| For applications where measuring fractions of ppm gas concentration is important, using the [[http://www.analog.com/ADA4528-2|ADA4528-2]] and the [[http://www.analog.com/ADR3412|ADR3412]] makes the circuit performance suitable for interfacing with a 16-bit ADC, such as the [[http://www.analog.com/AD7790|AD7790]]. | For applications where measuring fractions of ppm gas concentration is important, using the [[adi>ADA4528-2|ADA4528-2]] and the [[adi>ADR3412|ADR3412]] makes the circuit performance suitable for interfacing with a 16-bit ADC, such as the [[adi>AD7790|AD7790]]. |
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| CS connected to **Digital Pin 8** | CS connected to **Digital Pin 8** |
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| **AD7790 CS Selection** | **AD5270 CS Selection** |
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| {{:resources:eval:user-guides:eval-adicup360:hardware:cn0357:cn0357-hdr-02.png?nolink&100 |}} | {{:resources:eval:user-guides:eval-adicup360:hardware:cn0357:cn0357-hdr-02.png?nolink&100 |}} |
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| ---- | ---- |
| | ===== Software ===== |
| | * [[resources:eval:user-guides:eval-adicup360:reference_designs:demo_cn0357|ADICUP360 + CN0357 Demo]] |
| | * [[resources:eval:user-guides:eval-adicup3029:reference_designs:demo_cn0357|ADICUP3029 + CN0357 Bluetooth Demo]] |
| | * [[resources:eval:user-guides:arduino-uno:reference_designs:demo_cn0357|Arduino Uno + CN0357 Demo]] |
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| | ---- |
| ===== Schematic, Bill of Materials, Gerber Files, Layout Files ===== | ===== Schematic, Bill of Materials, Gerber Files, Layout Files ===== |
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| * {{:resources:eval:user-guides:eval-adicup360:hardware:cn0357:eval-cn0357-ardz-cadencelibrary-revb.zip|Cadence Files}} | * {{:resources:eval:user-guides:eval-adicup360:hardware:cn0357:eval-cn0357-ardz-cadencelibrary-revb.zip|Cadence Files}} |
| * {{:resources:eval:user-guides:eval-adicup360:hardware:cn0357:eval-cn0357-ardz-gbr-revb.zip|Gerber Files}} | * {{:resources:eval:user-guides:eval-adicup360:hardware:cn0357:eval-cn0357-ardz-gbr-revb.zip|Gerber Files}} |
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| [[http://www.analog.com/media/en/reference-design-documentation/design-integration-files/cn0357-shield-DesignSupport.zip|EVAL-CN0357-ARDZ Design & Integration Files]] | |
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| </WRAP> | </WRAP> |
| * Replaced R15,R16,R17,R19 and R20 to headers AD7790_CS and AD5270_CS for CS line selection | * Replaced R15,R16,R17,R19 and R20 to headers AD7790_CS and AD5270_CS for CS line selection |
| * Connected ICSP SPI lines MOSI,MISO and SCLK to DIGI1 headers(arduino pins D11,D12 and D13) respectively | * Connected ICSP SPI lines MOSI,MISO and SCLK to DIGI1 headers(arduino pins D11,D12 and D13) respectively |
| * Board Powered through 5V pin (Arduino POWER header) | * No longer need external 7V to 12V wall power supply |
| | * Board Powered through 5V pin (Arduino POWER header) |
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| ---- | |
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| ===== Software ===== | |
| * [[resources:eval:user-guides:eval-adicup360:reference_designs:demo_cn0357|CN0357 ADICUP360 Demo]] | |
| * Arduino Uno Example Code | |
| * [[https://github.com/analogdevicesinc/arduino/tree/master/Arduino%20Uno%20R3/examples|CN0357 Demo]] | |
| * [[https://github.com/analogdevicesinc/arduino/tree/master/Arduino%20Uno%20R3/libraries|AD7790 & AD5270 Libraries]] | |
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| {{navigation EVAL-ADICUP360#base_board|EVAL-ADICUP360 Base Board#.:|Hardware#none}} | // End of Document // |
