Texas Instruments ADS114S08IRHBR

Overview

ADS114S08IRHBR from Texas Instruments is a 16-bit delta-sigma analog-to-digital converter with integrated PGA (gain 1–128), 12-channel analog multiplexer, dual programmable current sources (10–2000 µA), internal 2.5-V reference (10 ppm/°C max drift), and 4.096-MHz oscillator. It operates from –50°C to +125°C and consumes as low as 280 µA in conversion mode, targeting high-accuracy sensor signal conditioning in industrial transmitters.

For engineers reviewing the ADS114S08IRHBR datasheet, ADS114S08IRHBR pinout, ADS114S08IRHBR application, or ADS114S08IRHBR equivalent, this page delivers verified technical context, real-world design meaning for key specs, validated VQFN-32 pin functions, application-specific implementation insights, and two confirmed alternative parts with documented functional and parametric differences.

Technical Context

The ADS114S08IRHBR implements a configurable sinc3 or low-latency digital filter supporting simultaneous 50-Hz/60-Hz rejection at ≤20 SPS, enabling robust operation in noisy industrial environments. Its PGA features rail detection and supports unipolar (2.7–5.25 V) or bipolar (±2.5 V) analog supplies, while the dual IDACs provide matched excitation for 2-/3-/4-wire RTDs with burnout detection.

It integrates four GPIOs (logic levels referenced to AVDD), internal temperature sensing (403 µV/°C coefficient), and comprehensive fault monitoring-including reference detection, supply voltage monitors (AVDD/4, DVDD/4), and AVSS-SW low-side switch (RON = 1–3 Ω). All functions are controlled via SPI with optional CRC and support self/system calibration.

Key Specifications

Pinout & Package

The ADS114S08IRHBR is housed in a 5.0 mm × 5.0 mm, 32-pin VQFN package (RHB) with exposed thermal pad connected to AVSS. Pin functions are validated per TI SBAS815A Rev A (June 2017).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS114S08IRHBR, ADS124S08IPBSR trades power and package for resolution headroom, while AD7124-8BCPZ-RL7 sacrifices channel count and diagnostic features for smaller footprint and medical compliance-neither is pin-compatible, requiring PCB and firmware revision.

Availability

ADS114S08IRHBR is available at Aetrix Electronics and suitable for temperature transmitters, PLC analog input modules, and industrial oven controllers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ADS114S08IRHBR 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 ADS114S0x family targets cost-sensitive, high-reliability industrial sensing applications-designed to replace multi-chip signal chains with a single IC featuring integrated PGA, reference, IDACs, and diagnostics.

FAQ

What is the maximum achievable data rate for ADS114S08IRHBR with full 16-bit resolution and no missing codes?

The ADS114S08IRHBR achieves 4 kSPS at 16-bit resolution with no missing codes, as specified in the Electrical Characteristics table under "Data rate". At this rate, effective resolution drops to ~13.5 bits due to increased noise; for guaranteed 16-bit ENOB, use ≤200 SPS with sinc3 filter and appropriate oversampling. The device maintains monotonicity and linearity across the full 2.5–4000 SPS range.

Does ADS114S08IRHBR support true differential input measurements across all 12 analog channels?

Yes, ADS114S08IRHBR supports true differential measurements on any pair of its 12 analog inputs (AIN0–AIN11) via the programmable input multiplexer. The PGA accepts differential inputs up to ±VREF/Gain, and the internal reference buffers allow independent selection of REFP0/REFN0 or REFP1/REFN1 as the reference pair-enabling fully differential ratiometric configurations for bridge or RTD sensors.

How does the internal burnout detection circuit function in ADS114S08IRHBR, and what are its current settings?

The ADS114S08IRHBR includes dedicated burnout current sources (BOCS) with three factory-trimmed settings: 0.2 µA, 1 µA, and 10 µA. When enabled, these currents inject into selected analog inputs to detect open-circuit conditions (e.g., broken RTD wires). Detection thresholds are monitored by the reference detection circuit, and status flags are reported via GPIO or SPI registers-no external components required.

Can ADS114S08IRHBR operate with an external clock source, and what is the supported frequency range?

Yes, ADS114S08IRHBR accepts an external clock on the CLK pin, supporting frequencies from 2 MHz to 4.5 MHz (nominal 4.096 MHz). Using an external clock improves timing jitter performance and enables synchronization across multiple ADCs in a system. When external clock is used, the internal oscillator is disabled automatically; the device remains fully functional with identical conversion accuracy and noise specifications.

What are the absolute maximum ratings for analog supply voltage (AVDD to AVSS) on ADS114S08IRHBR, and how does it impact bipolar operation?

The absolute maximum rating for AVDD to AVSS is –0.3 V to +5.5 V. For bipolar operation (±2.5 V), AVSS is set to –2.5 V and AVDD to +2.5 V, satisfying both the 5.5-V total swing limit and the recommended operating condition of 2.7–5.25 V differential. This configuration enables direct digitization of AC-coupled sensor outputs or bipolar transducer signals without level-shifting circuitry.