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ADC Pi

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  • AB Electronics
  • EXP-R72-009
  • ADCPI
  • 2
  • UK
  • 85423190
  • 0.005
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The ADC Pi is an 8 channel 17 bit analogue to digital converter designed to work with the... more

The ADC Pi is an 8 channel 17 bit analogue to digital converter designed to work with the Raspberry Pi. The ADC Pi is based on two Microchip MCP3424 A/D converters each containing 4 analogue inputs.  The MCP3424 is a delta-sigma A/D converter with low noise differential inputs.

The ADC Pi works as a single ended A/D converter using the internal 2.048V reference voltage with the -V pins tied to ground. A voltage divider on the ADC Pi board brings the input voltage range to a much more useful 0 – 5.06V. In this configuration the sample size is 17 bits for each channel.

The I2C address bits are selectable using the on-board 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 giving you 32 ADC inputs.

Features:

 

  • 8 x 17-bit 0 to 5V Single Ended Inputs
  • Control via the Raspberry Pi I2C port
  • Stack up to 4 ADC Pi boards on a single Raspberry Pi
  • Jumper selectable I2C addresses
  • Buffered 5V I2C port
  • Based on the MCP3424 from Microchip Technologies Inc
  • Single Ended full-scale range of 5.0V
  • On-board 2.048V reference voltage (Accuracy  ± 0.05%, Drift: 15 ppm/°C)
  • On-Board Programmable Gain Amplifier (PGA): Gains of 1, 2, 4 or 8
  • Programmable Data Rate Options:

 

            3.75 SPS (17 bits)
            15 SPS (15 bits)
            60 SPS (13 bits)
            240 SPS (11 bits)

 

  • One-Shot or Continuous Conversion Options

 

Specifications:

  • Vdd (5V pin on I2C bus)5.0V
  • ADC Input Voltage: 0V to +5.06V
  • Maximum ADC Input voltage: VSS–0.4V to VDD+0.4 V
  • Current at Input Pins: ±2 mA
  • I2C SDA/SCL voltage: 5.0 V
  • I2C port current: 100 mA
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