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

• I2C-Compatible Interface

• Supported I2C Bus Speed Modes:

Standard-Mode, Fast-Mode, Fast-Mode Plus

• 16 Pin-Configurable I2C Addresses

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

2 Applications

• Field Transmitters:

Temperature, Pressure, Strain, Flow

• PLC and DCS Analog Input Modules

• Temperature Controllers

• Heat Meters

• Patient Monitoring Systems:

Body Temperature, Blood Pressure

3 Description

The ADS122C04 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 ADS122C04 ideally

suited for applications measuring small sensor

signals, such as resistance temperature detectors

(RTDs), thermocouples, thermistors, and resistive

bridge sensors.

The ADS122C04 features a 2-wire, I2C-compatible

interface that supports I2C bus speeds up to 1 Mbps.

Two address pins allow selection of 16 different I2C

addresses for the device.

The ADS122C04 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.