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

• 16-Bit Noise-Free Resolution at 20 SPS

• 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:

50 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 Controls

3 Description

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 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 ADS1120 ideallysuited

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.