Texas Instruments ADS8166IRHBR

Overview

ADS8166IRHBR from Texas Instruments is a 16-bit, 8-channel SAR ADC with integrated 4.096V reference, REFby2 buffer, and programmable window comparator per channel. It delivers 250kSPS total throughput, ±0.3LSB INL, 92dB SNR, and operates from –40°C to +125°C with AVDD = 3–5.5V and DVDD = 1.65–5.5V. It enables compact sensor interface designs in anesthesia delivery systems and mixed-signal modules.

For engineers reviewing the ADS8166IRHBR datasheet, ADS8166IRHBR pinout, ADS8166IRHBR application, or ADS8166IRHBR equivalent, this page provides verified specifications, VQFN-32 pin mapping, real-world use scenarios, and two confirmed alternative parts for industrial-grade data acquisition where low power, high DC accuracy, and on-chip monitoring are required.

Technical Context

The ADS8166IRHBR implements a successive approximation register architecture with internal sampling capacitor array and asynchronous conversion control. Its analog multiplexer supports single-ended and pseudo-differential input configurations, with extended settling time enabled by MUXOUT-P/MUXOUT-M breakout pins for external op-amp driving.

Digital interface uses enhanced-SPI with configurable SDR/DDR modes up to 50MHz, supporting manual, on-the-fly, auto-sequence, and custom channel sequencing. Per-channel digital window comparators include programmable hysteresis to prevent false triggers in noisy environments.

Key Specifications

Pinout & Package

ADS8166IRHBR is housed in a 32-pin VQFN package (RHB), 5mm × 5mm, with exposed thermal pad connected to GND. The package supports high-density PCB layouts and efficient heat dissipation in industrial modules.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit multichannel SAR ADC applications.

Compared with ADS8167IRHBR and ADS8168IRHBR, the ADS8166IRHBR trades raw speed for lowest power and thermal footprint-making it optimal for always-on, battery-assisted, or convection-cooled industrial sensors where 250kSPS meets control loop requirements.

Availability

ADS8166IRHBR is available at Aetrix Electronics and suitable for chemistry analyzers, anesthesia delivery systems, mixed-signal I/O modules, and intra-DC interconnect monitoring requiring stable component supply, long-term lifecycle support, and guaranteed traceability.

Supply support for ADS8166IRHBR 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 converters and industrial-grade ICs.

The ADS816x family was designed specifically for high-accuracy, low-power, multichannel sensor interface applications in medical, test & measurement, and industrial automation-integrating reference, buffer, comparator, and flexible sequencing into a single VQFN package.

FAQ

What is the maximum sample rate of the ADS8166IRHBR?

The ADS8166IRHBR has a fixed total throughput of 250kSPS across all eight channels. This is its maximum sustained sampling rate-verified in the datasheet's Recommended Operating Conditions table (Section 5.4) and Timing Requirements (Section 5.6). Unlike the ADS8167IRHBR (500kSPS) or ADS8168IRHBR (1MSPS), the ADS8166IRHBR does not support higher rates even with reduced channel count.

Does the ADS8166IRHBR require an external reference voltage?

No-the ADS8166IRHBR includes an integrated 4.096V reference with ±4ppm/°C drift, and REFIO can be configured as an output. An external reference (2.5V–5V) is optional and only needed when higher accuracy or custom full-scale range is required. When using the internal reference, REFP and REFM must be shorted externally per the datasheet.

How does the REFby2 pin function in the ADS8166IRHBR?

The REFby2 pin delivers a precise 2.048V output (exactly half of REFP) and is used to DC-bias AC-coupled analog inputs-such as those from piezoelectric accelerometers or capacitive humidity sensors. It eliminates external resistor dividers and maintains matching with the main reference, reducing gain error and thermal drift in bias networks.

Can the ADS8166IRHBR perform true differential measurements?

No-the ADS8166IRHBR supports only pseudo-differential input mode (e.g., AIN0–AIN1 pair referenced to AIN-COM), not fully differential (AINx–AINy) as seen in delta-sigma or dedicated differential SAR ADCs. Its architecture uses a single-ended ADC core with multiplexer-based channel selection, limiting common-mode rejection to ~70dB per the datasheet's crosstalk specification.

What is the purpose of the MUXOUT-P and MUXOUT-M pins on the ADS8166IRHBR?

MUXOUT-P and MUXOUT-M provide access to the multiplexer's differential output nodes before the ADC core. This breakout enables a single external op-amp to drive all eight analog inputs with matched gain, phase, and settling-reducing component count, board area, and inter-channel mismatch compared to individual driver amplifiers per channel.