16-bit, 2-kSPS, 4-ch, low-power, small-size delta-sigma ADC with PGA, VREF, 2x IDACs & SPI interface

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

20SPS,

the digital filter offers simultaneous

50Hz

and

60Hz

rejection for noisy industrial applications. The internal PGA offers gains up to

128.

This PGA makes the ADS1120

designed

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,

allowing for single-ended measurements.

Power consumption is as low as

120µA

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.