1 Features
1• 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 at
20 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

2 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

3 Description
The ADS1220 is a precision, 24-bit, analog-to-digital
converter (ADC) that offers many integrated features
to reduce system cost and component count in
applications measuring small sensor signals. The
device features two differential or four single-ended
inputs through a flexible input multiplexer (MUX), a
low-noise, programmable gain amplifier (PGA), two
programmable excitation current sources, a voltage
reference, an oscillator, a low-side switch, and a
precision temperature sensor.
The device can perform conversions at data rates up
to 2000 samples-per-second (SPS) with single-cycle
settling. At 20 SPS, the digital filter offers
simultaneous 50-Hz and 60-Hz rejection for noisy
industrial applications. The internal PGA offers gains
up to 128 V/V. This PGA makes the ADS1220 ideallysuited
for applications measuring small sensor
signals, such as resistance temperature detectors
(RTDs), thermocouples, thermistors, and resistive
bridge sensors. The device supports measurements
of pseudo- or fully-differential signals when using the
PGA. Alternatively, the device can be configured to
bypass the internal PGA while still providing high
input impedance and gains up to 4 V/V, allowing for
single-ended measurements.
Power consumption is as low as 120 μA when
operating in duty-cycle mode with the PGA disabled.
The ADS1220 is offered in a leadless VQFN-16 or a
TSSOP-16 package and is specified over a
temperature range of –40°C to +125°C.