Texas Instruments ADS8167IRHBR

Overview

ADS8167IRHBR from Texas Instruments is a 16-bit, 8-channel SAR ADC with integrated 4.096V reference, programmable window comparator per channel, and enhanced-SPI interface. It delivers 500kSPS throughput, ±0.35LSB INL, 93.5dB SNR, and operates from –40°C to +125°C with AVDD = 3–5.5V and DVDD = 1.65–5.5V. It enables compact sensor data acquisition in anesthesia delivery systems and mixed-signal modules.

For engineers reviewing the ADS8167IRHBR datasheet, ADS8167IRHBR pinout, ADS8167IRHBR application, or ADS8167IRHBR equivalent, key selection considerations include its on-the-fly channel sequencing, REFby2 DC bias output, per-channel alarm thresholds, and low-power operation at industrial temperature range - all verified for direct sensor interface use cases.

Technical Context

The ADS8167IRHBR implements a successive approximation register architecture with internal sampling capacitor array disconnected during conversion and reconnected during acquisition. Its analog multiplexer supports single-ended and pseudo-differential inputs with extended settling time, enabling use of a single external op-amp driver across all eight channels.

It integrates a low-drift 4.096V reference (±18 ppm/°C drift), REFby2 buffer (VREFP/2), reference buffer, LDO, and digital window comparator with programmable hysteresis. The enhanced-SPI interface supports both SDR (70MHz) and DDR (35MHz) modes with configurable data rates and CS-triggered conversion initiation.

Key Specifications

Pinout & Package

RHB package: 32-pin VQFN, 5mm × 5mm, exposed thermal pad (connected to GND). Pin count and layout optimized for high-density PCBs with minimal routing complexity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8168IRHBR and ADS8166IRHBR, the ADS8167IRHBR delivers optimal balance of speed (500kSPS), precision (±0.35LSB INL), and power (19.5mW), making it the preferred choice for medical and industrial data loggers requiring deterministic timing and thermal robustness.

Availability

ADS8167IRHBR is available at Aetrix Electronics and suitable for chemistry analyzers, anesthesia delivery systems, and mixed-signal I/O modules requiring stable component supply across extended temperature and long production lifecycles.

Supply support for ADS8167IRHBR 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 IC design.

The ADS816x product line was engineered specifically for high-accuracy, low-power, multi-channel sensor interfacing in medical, test equipment, and industrial automation - emphasizing integration, reliability, and ease of system-level implementation.

FAQ

What is the maximum sample rate of the ADS8167IRHBR?

The ADS8167IRHBR has a fixed maximum throughput of 500kSPS, as defined by its device variant within the ADS816x family. This rate is guaranteed across the full operating temperature range (–40°C to +125°C) and does not require external clocking - the internal oscillator ensures deterministic timing. The ADS8167IRHBR achieves this while maintaining 93.5dB SNR and ±0.35LSB INL, distinguishing it from lower-speed variants like ADS8166IRHBR (250kSPS) and higher-speed ADS8168IRHBR (1MSPS).

Does the ADS8167IRHBR require an external reference voltage?

No, the ADS8167IRHBR includes an integrated 4.096V low-drift reference (±18 ppm/°C) accessible at the REFIO pin, eliminating the need for an external reference in most applications. However, it also supports external reference inputs from 2.5V to 5V via the same REFIO pin when higher flexibility or custom scaling is required. In either mode, a 1µF decoupling capacitor to GND is mandatory for stability - a requirement explicitly specified in the datasheet for both internal and external reference configurations.

How does the REFby2 pin function in the ADS8167IRHBR?

The REFby2 pin on the ADS8167IRHBR outputs a precise 2.048V signal (exactly half of the internal 4.096V reference), intended for DC biasing of pseudo-differential or bipolar sensor inputs. This allows users to shift sensor common-mode voltage into the optimal range of the ADC's input stage, maximizing dynamic range utilization without adding external resistive dividers or op-amps. The REFby2 buffer can source up to 2mA and requires a 1µF decoupling capacitor to GND, as confirmed in Section 5.5 of the ADS8167IRHBR datasheet.

Can the ADS8167IRHBR perform autonomous channel monitoring without MCU intervention?

Yes, the ADS8167IRHBR features a per-channel programmable digital window comparator with independently set high/low thresholds and adjustable hysteresis. When enabled, it continuously monitors each analog input and asserts the ALERT pin (active-high) whenever any configured channel exceeds its bounds - all without host processor involvement. This autonomous behavior is validated in the device's functional description (Section 6.3) and timing diagrams, making it suitable for safety-critical applications such as anesthesia delivery where immediate fault detection is mandatory.

What package type and thermal characteristics does the ADS8167IRHBR use?

The ADS8167IRHBR uses the RHB package: a 32-pin VQFN measuring 5mm × 5mm with an exposed thermal pad connected to GND. Its thermal metrics include RθJA = 29.5°C/W and RθJB = 10.2°C/W, enabling reliable operation at full load up to +125°C ambient when mounted on a standard 2-layer PCB with adequate copper pour. The thermal pad must be soldered to a GND plane - a requirement emphasized in the Mechanical, Packaging, and Orderable Information section (Page 77) of the official datasheet.