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Description ADC Differential Pi
The ADC Differential Pi is an 8 channel 18 bit analog to digital converter designed to work with the Raspberry Pi . The ADC Pi is based on two Microchip MCP3424 A/D converters with 4 analog inputs each. The MCP3424 is a delta-sigma A/D converter with low-noise differential inputs.
The board can be used as a single-ended A/D converter. It uses the internal 2.048V reference voltage with the -V pins connected to Ground . A voltage divider on the ADC Pi board brings the input voltage range to a usable 0 - 5.06V . In this configuration the sample size is 17 bits for each channel.
The ADC Differential Pi is designed as a companion to the ADC Pi. Unlike the ADC Pi, the ADC Differential Pi does not include voltage dividers. This allows inputs to be used to measure a differential voltage range of ±2.048V . This is useful for measuring inputs below ±2.048V. It also allows you to use your own voltage divider to measure higher voltages . The ADC Differential Pi is powered from the Raspberry Pi using the GPIO pins or via the onboard power connector . The extended GPIO pins allow you to stack the ADC Pi with other expansion boards.
The two MCP3424 A/D converters communicate with the Raspberry Pi via I2C. This allows you to use 8 analog inputs. A logic level converter is built into the ADC Pi board. This gives you a buffered 5V I2C port. Thanks to the I2C port you can easily add other I2C devices that operate on 5V. The I2C buffer uses N-channel mosfets with a maximum drain current of 100mA .
The I2C address bits can be selected using the built-in jumpers. The MCP3424 supports up to 8 different I2C addresses. So with two A/D converters on each ADC Pi, you can stack up to 4 ADC Pi boards on a single Raspberry Pi . This gives you 32 ADC inputs.
The MCP3424 includes a built-in 2.048V reference voltage with an input range of ±2.048V differential (full scale range of 4.096V/PGA) . A programmable gain amplifier provides the user with a selectable gain of x1, x2, x4, or x8 before analog to digital conversion .
The data rate for analog to digital conversions is 3.75 (18 bit), 15 (16 bit), 60 (14 bit), or 240 (12 bit) samples per second . Data rate and resolution can be configured within software using the I2C interface.
ADC Differential Pi
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5151+ reviews
4.7 avg.
5151+ reviewsView allSKU: AB1018 Categories: Raspberry Pi Accessories
Description ADC Differential Pi
The ADC Differential Pi is an 8 channel 18 bit analog to digital converter designed to work with the Raspberry Pi . The ADC Pi is based on two Microchip MCP3424 A/D converters with 4 analog inputs each. The MCP3424 is a delta-sigma A/D converter with low-noise differential inputs.
The board can be used as a single-ended A/D converter. It uses the internal 2.048V reference voltage with the -V pins connected to Ground . A voltage divider on the ADC Pi board brings the input voltage range to a usable 0 - 5.06V . In this configuration the sample size is 17 bits for each channel.
The ADC Differential Pi is designed as a companion to the ADC Pi. Unlike the ADC Pi, the ADC Differential Pi does not include voltage dividers. This allows inputs to be used to measure a differential voltage range of ±2.048V . This is useful for measuring inputs below ±2.048V. It also allows you to use your own voltage divider to measure higher voltages . The ADC Differential Pi is powered from the Raspberry Pi using the GPIO pins or via the onboard power connector . The extended GPIO pins allow you to stack the ADC Pi with other expansion boards.
The two MCP3424 A/D converters communicate with the Raspberry Pi via I2C. This allows you to use 8 analog inputs. A logic level converter is built into the ADC Pi board. This gives you a buffered 5V I2C port. Thanks to the I2C port you can easily add other I2C devices that operate on 5V. The I2C buffer uses N-channel mosfets with a maximum drain current of 100mA .
The I2C address bits can be selected using the built-in jumpers. The MCP3424 supports up to 8 different I2C addresses. So with two A/D converters on each ADC Pi, you can stack up to 4 ADC Pi boards on a single Raspberry Pi . This gives you 32 ADC inputs.
The MCP3424 includes a built-in 2.048V reference voltage with an input range of ±2.048V differential (full scale range of 4.096V/PGA) . A programmable gain amplifier provides the user with a selectable gain of x1, x2, x4, or x8 before analog to digital conversion .
The data rate for analog to digital conversions is 3.75 (18 bit), 15 (16 bit), 60 (14 bit), or 240 (12 bit) samples per second . Data rate and resolution can be configured within software using the I2C interface.