Texas Instruments ADS114S08BIPBS

Overview

ADS114S08BIPBS from Texas Instruments is a 16-bit, delta-sigma analog-to-digital converter with integrated programmable gain amplifier (PGA), 12-channel analog multiplexer, dual matched excitation current sources (10–2000 µA), internal 2.5-V reference (8 ppm/°C drift), and 4.096-MHz oscillator. It operates from –40°C to +125°C with supply ranges of AVDD/AVSS = ±2.5 V or 2.7–5.25 V and DVDD/IOVDD = 2.7–3.6 V. Used in industrial field transmitters for RTD, thermocouple, and bridge sensor signal conditioning.

For engineers reviewing the ADS114S08BIPBS datasheet, ADS114S08BIPBS pinout, ADS114S08BIPBS application, or ADS114S08BIPBS equivalent, this page delivers verified technical context, real-world timing and noise performance at ≤20 SPS, confirmed GPIO functionality, calibrated burn-out detection, and precise SPI interface timing - all specific to the PBS (TQFP-32) package variant.

Technical Context

The ADS114S08BIPBS implements a low-latency digital filter enabling simultaneous 50-Hz and 60-Hz rejection at data rates ≤20 SPS, critical for noisy industrial environments. Its PGA supports gains of 1–128 with input offset voltage as low as 20 µV (bypassed) and <2 µV (calibrated, gain ≥16), directly supporting high-accuracy resistive bridge and thermocouple measurements.

It integrates two independently programmable IDACs with 0.2% matching drift and four GPIOs referenced to AVDD logic levels. The device supports both internal reference (2.5 V, ±0.2% accuracy at 25°C) and dual buffered external reference inputs (REFP0/REFN0, REFP1/REFN1), with built-in reference monitoring detecting voltages below 0.3 V.

Key Specifications

Pinout & Package

The ADS114S08BIPBS is packaged in a 32-pin TQFP (PBS) with 5.0 mm × 5.0 mm body size and exposed thermal pad connected to AVSS. Pin functions are validated per TI SBAS852A Rev. FEBRUARY 2020.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar precision delta-sigma ADC applications.

Compared with ADS124S08IPBS and AD7124-8BCPZ, the ADS114S08BIPBS uniquely balances 12-channel flexibility, integrated VBIAS, and 0.2-µA input bias in a TQFP-32 package - making it the most compact, self-contained solution for 4–6 wire RTD and thermocouple transmitters requiring ≤0.1°C accuracy.

Availability

ADS114S08BIPBS is available at Aetrix Electronics and suitable for field transmitters, PLC analog input modules, and temperature controllers requiring stable component supply across extended industrial temperature ranges and long production lifecycles.

Supply support for ADS114S08BIPBS includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of expertise in precision data acquisition and industrial signal chain solutions.

The ADS114S0xB family was designed specifically for high-integration, low-power industrial sensor front-ends - targeting field transmitters, distributed control systems, and process automation equipment where PCB area, power, and calibration complexity must be minimized.

FAQ

What is the maximum data rate supported by the ADS114S08BIPBS?

The ADS114S08BIPBS supports a maximum data rate of 4000 SPS (samples per second), with 14 selectable rates ranging from 2.5 SPS to 4 kSPS. At 4 kSPS, the device maintains 16-bit resolution with no missing codes, though 50/60-Hz rejection is only guaranteed at ≤20 SPS. This makes ADS114S08BIPBS suitable for both high-speed diagnostics and ultra-stable low-noise measurements.

Does the ADS114S08BIPBS require an external crystal or oscillator?

No, the ADS114S08BIPBS includes an internal 4.096-MHz oscillator with ±2% accuracy, eliminating the need for external timing components. The CLK pin can be tied to DGND to enable the internal oscillator. An external clock (2–4.5 MHz) may be used for tighter timing control, but it is optional - the internal oscillator is fully functional for all specified data rates and calibration sequences in ADS114S08BIPBS.

How many analog input channels does the ADS114S08BIPBS support?

The ADS114S08BIPBS supports 12 independently selectable analog input channels: AIN0 through AIN5, AIN6 through AIN11 (mapped to pins 32, 31, 22, 21, 20, 19). This includes dedicated inputs for REFP1/AIN6 and REFN1/AIN7, enabling flexible configurations such as 4-wire RTD, 3-wire RTD with compensation, or multi-sensor thermocouple arrays - all within a single ADS114S08BIPBS device.

Can the ADS114S08BIPBS perform self-calibration without host processor intervention?

Yes, the ADS114S08BIPBS supports autonomous self-offset and system-gain calibration. Calibration commands (e.g., SYOCAL, SGCAL) execute entirely on-chip, requiring only SPI initiation and completion polling. The internal reference settles in 5.9 ms and IDACs stabilize in 22 µs, allowing full calibration cycles in under 10 ms. This capability enables unattended recalibration during maintenance windows or power-up sequences in ADS114S08BIPBS-based field devices.

What is the function of the VBIAS pin on the ADS114S08BIPBS?

The VBIAS pin on the ADS114S08BIPBS outputs a buffered mid-supply voltage equal to (AVDD + AVSS)/2, with 350-Ω output impedance and 2.8-ms startup time. It is used to bias thermocouple inputs, establish common-mode voltage for differential sensors, or drive remote sensor excitation - eliminating the need for external resistive dividers or op-amp buffers in ADS114S08BIPBS-based designs.