1 Features

1• Low power consumption: as low as 280 μA

• Programmable gain: 1 to 128

• Programmable data rates: 2.5 SPS to 4 kSPS

• Simultaneous 50-Hz and 60-Hz rejection at

≤ 20 SPS with low-latency digital filter

• Analog multiplexer with 12 (ADS114S08B) or 6

(ADS114S06B) independently selectable inputs

• Dual-matched programmable current sources for

sensor excitation: 10 μA to 2000 μA

• Internal reference: 2.5 V, 8 ppm/°C (typ) drift

• Internal oscillator: 4.096 MHz, 2% accuracy

• Internal temperature sensor

• Self offset and system calibration

• Four general-purpose i/os

• SPI-compatible interface

• Analog supply: unipolar (2.7 V to 5.25 V) or

bipolar (±2.5 V)

• Digital supply: 2.7 V to 3.6 V

• Operating temperature: –40°C to +125°C

• Pin-compatible with the ADS114S0x

2 Applications

• Field transmitters:

temperature, pressure, strain, flow

• PLC and DCS analog input modules

• Temperature controllers

• Climate chambers, industrial ovens

3 Description

The ADS114S06B and ADS114S08B are precision,

16-bit, delta-sigma (ΔΣ), analog-to-digital converters

(ADCs) that offer low power consumption and many

integrated features to reduce system cost and

component count in applications measuring smallsignal

sensors.

These ADCs feature a digital filter that offers lowlatency

conversion results and 50-Hz or 60-Hz

rejection for noisy industrial environments. A lownoise,

programmable gain amplifier (PGA) provides

gains ranging from 1 to 128 to amplify low-level

signals for resistive bridge or thermocouple

applications. Additionally, these devices integrate a

low-drift, 2.5-V reference that reduces printed circuit

board (PCB) area. Finally, two programmable

excitation current sources (IDACs) allow for easy and

accurate RTD biasing.

An input multiplexer supports 12 inputs for the

ADS114S08B and six inputs for the ADS114S06B

that can be connected to the ADC in any combination

for design flexibility. In addition, these devices include

features such as sensor burn-out detection, voltage

bias for thermocouples, system monitoring, and four

general-purpose I/Os (GPIOs).

The devices are offered in a leadless VQFN-32 or a

TQFP-32 package.