Description：

The ADS1220 is a precision, 24-bit, analog-to-digitalconverter (ADC) that offers many integrated featuresto reduce system cost and component count inapplications measuring small sensor signals. Thedevice features two differential or four single-endedinputs through a flexible input multiplexer (MUX), alow-noise, programmable gain amplifier (PGA), twoprogrammable excitation current sources, a voltagereference, an oscillator, a low-side switch, and aprecision temperature sensor.The device can perform conversions at data rates upto 2000 samples-per-second (SPS) with single-cyclesettling. At 20 SPS, the digital filter offerssimultaneous 50-Hz and 60-Hz rejection for noisyindustrial applications. The internal PGA offers gainsup to 128 V/V. This PGA makes the ADS1220 ideallysuited for applications measuring small sensorsignals, such as resistance temperature detectors(RTDs), thermocouples, thermistors, and resistivebridge sensors. The device supports measurementsof pseudo- or fully-differential signals when using thePGA. Alternatively, the device can be configured tobypass the internal PGA while still providing highinput impedance and gains up to 4 V/V, allowing forsingle-ended measurements.Power consumption is as low as 120 µA whenoperating in duty-cycle mode with the PGA disabled.The ADS1220 is offered in a leadless VQFN-16 or aTSSOP-16 package and is specified over atemperature range of –40°C to +125°C.

 Features：

• Low Current Consumption:As Low as 120 μA (typ) in Duty-Cycle Mode

• Wide Supply Range: 2.3 V to 5.5 V

• Programmable Gain: 1 V/V to 128 V/V

• Programmable Data Rates: Up to 2 kSPS

• Up to 20-Bits Effective Resolution

• Simultaneous 50-Hz and 60-Hz Rejection at20 SPS with Single-Cycle Settling Digital Filter

• Two Differential or Four Single-Ended Inputs

• Dual Matched Programmable Current Sources:10 μA to 1.5 mA

• Internal 2.048-V Reference: 5 ppm/°C (typ) Drift

• Internal 2% Accurate Oscillator

• Internal Temperature Sensor:0.5°C (typ) Accuracy

• SPI-Compatible Interface (Mode 1)

• Package: 3.5-mm × 3.5-mm × 0.9-mm VQFN

Applications：

• Temperature Sensor Measurements:

– Thermistors

– Thermocouples

– Resistance Temperature Detectors (RTDs):2-, 3-, or 4-Wire Types

• Resistive Bridge Sensor Measurements:

– Pressure Sensors

– Strain Gauges

– Weigh Scales

• Portable Instrumentation

• Factory Automation and Process Control