Texas Instruments ADS8675IPWR

Overview

ADS8675IPWR from Texas Instruments is a 14-bit, 500 kSPS successive approximation register (SAR) analog-to-digital converter with integrated analog front-end, programmable bipolar/unipolar input ranges (±12.288 V to ±2.56 V or 0–12.288 V), on-chip 4.096-V low-drift reference, and multiSPI™ interface. It operates from a single 5-V analog supply with 1.65–5-V I/O compatibility and delivers ±0.4 LSB INL, 84.5 dB SNR, and ±20 V input overvoltage protection - deployed in industrial trackside signaling and high-precision data acquisition systems.

For engineers reviewing the ADS8675IPWR datasheet, ADS8675IPWR pinout, ADS8675IPWR application, or ADS8675IPWR equivalent, this page provides verified technical context, package mapping, real-world use-value per application, and two confirmed alternative parts - all grounded in TI's SBAS779B production datasheet and validated TSSOP-16 implementation details.

Technical Context

The ADS8675IPWR implements a true single-supply SAR ADC architecture with integrated PGA, second-order LPF, and overvoltage protection circuitry rated for ±20 V (AVDD = 5 V). Its software-programmable input range selection is executed via internal register writes, enabling dynamic reconfiguration of full-scale spans without external hardware changes.

It supports three serial interface modes: standard SPI (CPOL/CPHA configurable), multiSPI daisy-chain (dual SDO), and source-synchronous modes (internal or external clock). The RVS pin provides real-time conversion status, while ALARM/SDO-1/GPO enables threshold-triggered system alerts - all operating across –40°C to +125°C.

Key Specifications

Pinout & Package

Packaged in a 16-pin TSSOP (PW) with 5.00 mm × 4.40 mm body size, the ADS8675IPWR features separate analog/digital/reference ground planes and decoupling pins (REFCAP, REFGND) to maintain signal integrity in mixed-signal layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-precision, programmable-input-range SAR ADC applications.

Compared with ADS8675IPWR, ADS8685IPWR offers higher resolution but lower AC performance, while AD7606C-16BSTZ provides channel simultaneity and speed at the cost of supply complexity and missing on-chip reference - making ADS8675IPWR optimal for single-channel, single-supply, field-deployable DAQ.

Availability

ADS8675IPWR is available at Aetrix Electronics and suitable for trackside signaling interfaces, modular analog input units, and industrial data acquisition systems requiring stable component supply, extended temperature support, and long-term obsolescence management.

Supply support for ADS8675IPWR 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, embedded processing, and connectivity technologies - with over 50 years of precision data converter innovation.

The ADS867x family was designed for ruggedized industrial data acquisition where programmable input ranges, single-supply operation, and integrated protection reduce system-level design risk in railway, energy, and factory automation.

FAQ

What is the maximum sampling rate of the ADS8675IPWR?

The ADS8675IPWR has a fixed maximum sampling rate of 500 kSPS, corresponding to a 2-µs conversion cycle time (1000 ns acquisition + 1000 ns conversion). This rate is guaranteed across the full –40°C to +125°C operating range and does not vary with input range selection or reference configuration. The ADS8675IPWR achieves this performance using an integrated SAR architecture with optimized internal timing control.

Does the ADS8675IPWR require an external reference voltage?

No, the ADS8675IPWR does not require an external reference voltage - it integrates a precision 4.096-V reference with 4 ppm/°C drift, accessible on the REFIO pin. The device can also accept an external reference (4.046 V to 4.146 V) via REFIO if higher accuracy or custom scaling is needed, but internal reference operation is fully functional and commonly used in field-deployed ADS8675IPWR designs.

How does the programmable input range work on the ADS8675IPWR?

The ADS8675IPWR supports eight software-programmable input ranges (five bipolar, three unipolar) via SPI register writes to its internal configuration registers. Range selection automatically adjusts gain and offset calibration coefficients stored in factory-trimmed memory - no external components or hardware changes are needed. Each range maintains ≤±0.4 LSB INL and ≥1 MΩ input impedance, ensuring consistent DC accuracy across all modes.

What protection features does the ADS8675IPWR include for field wiring faults?

The ADS8675IPWR includes integrated input overvoltage protection rated for ±20 V on AIN_P and AIN_GND when AVDD = 5 V, and ±15 V when AVDD is floating. This protection operates independently of the selected input range and remains active during power-up, power-down, and standby modes. Combined with its –40°C to +125°C rating and 4.096-V internal reference, this makes the ADS8675IPWR robust for trackside, substation, and factory-floor deployments.

Is the ADS8675IPWR pin-compatible with other devices in the ADS867x family?

Yes, the ADS8675IPWR is pin-compatible with ADS8671IPWR and ADS8685IPWR in the TSSOP-16 (PW) package - sharing identical pin functions, power domains, and interface protocols. This allows drop-in replacement between speed grades (ADS8671 = 1 MSPS, ADS8675 = 500 kSPS) and resolution grades (ADS8675 = 14-bit, ADS8685 = 16-bit) without PCB redesign, provided system firmware accounts for timing and register differences.