Technical summary
The main technical data are:
- Analog supply : 2.3 to 5.5 volts at AVDD / AVSS (AGND).
- Digital supply : 2.3 to 5.5 volts on DVDD / DGND.
- Bipolar supply option : for example AVSS to DGND = -2.5 volts, AVDD to DGND = +2.5 volts.
- Power consumption : 120 microamperes in duty-cycle mode.
- Communication : via SPI.
- Reference voltages :
- Internal: 2.048 volts.
- External: VREFP x – VREFN x = min. 0.75 volts, max. AVDD.
- Gain : 1 – 128 (with PGA = Programmable Gain Amplifier), 1 – 4 (without PGA).
- Data rate : 5 – 2000 SPS (Samples per second)
- Conversion modes : Continuous mode and "single-shot" mode.
- Voltage inputs : 4 single-ended inputs (referred to AVSS) or 2 differential inputs.
- Measurement in multiplex mode .
- Two programmable IDACs (current digital-to-analog converters) : 10 microamperes to 1.5 milliamperes (also called "excitation current source" in the datasheet).
- Digital filter : 50 and/or 60 Hz.
- Temperature sensor built in.
ADS1220 module pinout
The labels of the module inputs and outputs differ in part from those of the datasheet (in parentheses where applicable):
- MISO (DOUT/DRDY), MOSI (DIN), SCLK , CS : SPI connectors
- AVDD , AGND (AVSS): Analog voltage supply
- DVDD , DGND : Digital voltage
- CLK : external clock (optional)
- DRDY : Data-ready pin, is LOW when data is available.
- REFP0, REFN0 : external reference voltage; "P" = positive, "N" = negative.
- AIN0 (AIN0/REFP1), AIN1 , AIN2 , AIN3 (AIN3/REFN1): Inputs for the voltages to be measured.
- AIN0/AIN3 can also be used as an input for an additional external reference voltage.
