1 Features

1• Current Consumption as Low as 315 μA (typ)

• Wide Supply Range: 2.3 V to 5.5 V

• Programmable Gain: 1 to 128

• 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

• Three General-Purpose Inputs/Outputs

• 2-Wire UART Compatible Interface (8-N-1 Format)

With Baud Rates up to 120 kBaud and

Auto-Baud-Rate Detection

• Package: 3.0-mm × 3.0-mm × 0.75-mm WQFN

2 Applications

• Sensor Transducers and Transmitters:

Temperature, Pressure, Strain, Flow

• PLC and DCS Analog Input Modules

• Temperature Controllers

• Climate Chambers, Industrial Ovens

• Patient Monitoring Systems:

Body Temperature, Blood Pressure

3 Description

The ADS122U04 is a precision, 24-bit, analog-todigital

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, 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. This PGA makes the ADS122U04 ideally

suited for applications measuring small sensor

signals, such as resistance temperature detectors

(RTDs), thermocouples, thermistors, and resistive

bridge sensors.

The ADS122U04 features a 2-wire, UART-compatible

interface. In applications that require galvanic

isolation this universal asynchronous

receiver/transmitter (UART) interface minimizes the

number of digital isolation channels, thus saving cost,

board space, and power.

The ADS122U04 is offered in a leadless 16-pin

WQFN or a 16-pin TSSOP package and is specified

over a temperature range of –40°C to +125°C.