The ADS1120 is a precision, 16-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
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
ADS1120 ideally-suited for applications measuring small sensor signals, such as resistance
temperature detectors (RTDs), thermocouples, thermistors, and 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 ADS1120 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.