Texas Instruments ADS8675IPW

Overview

ADS8675IPW 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 reference, and multiSPI™ interface. It operates from a single 5-V analog supply with 1.65–5-V I/O support and targets high-precision industrial data acquisition systems requiring ±20-V input overvoltage protection and stable DC accuracy across –40°C to +125°C.

For engineers reviewing the ADS8675IPW datasheet, ADS8675IPW pinout, ADS8675IPW application, or ADS8675IPW equivalent, this page delivers verified specifications including conversion rate, input range programming, SNR (84.5 dB), THD (–105 dB), and TSSOP-16 package compatibility - critical for analog input module design, trackside signaling interfaces, and mixed-signal DAQ systems with strict thermal and layout constraints.

Technical Context

The ADS8675IPW implements a fully integrated SAR ADC architecture with internal PGA, second-order LPF, overvoltage protection circuitry (±20 V at AVDD = 5 V), and digitally programmable gain/offset calibration per input range. Its analog front-end maintains ≥1 MΩ resistive input impedance across all 9 software-selectable ranges, eliminating external signal conditioning for most industrial sensor interfaces.

Digital control uses a multiSPI™ interface supporting standard SPI modes (CPOL/CPHA), daisy-chain configuration, and source-synchronous operation with either internal or external clock. The ALARM output provides hardware-triggered high/low threshold detection independent of host polling, enabling real-time fault response in safety-critical monitoring applications.

Key Specifications

Pinout & Package

TSSOP-16 package (5.00 mm × 4.40 mm), thermally enhanced for industrial ambient operation up to +125°C. Pinout validated per TI SBAS779B Rev. B (March 2021), Figure 5-1 and Table 5-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8675IPW, ADS8685IPW trades ALARM functionality for 2-bit resolution gain, while AD7606C-16BSTZ offers higher speed and bit depth at the cost of increased supply complexity, board space, and firmware integration effort - making ADS8675IPW optimal for cost-sensitive, single-supply, alarm-critical industrial DAQ.

Availability

ADS8675IPW is available at Aetrix Electronics and suitable for analog input modules, mixed I/O modules, and trackside signaling systems requiring stable component supply, long-term industrial lifecycle support, and guaranteed extended-temperature performance.

Supply support for ADS8675IPW 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 decades of industrial-grade product development and manufacturing excellence.

The ADS867x family was designed specifically for high-reliability industrial data acquisition, integrating precision SAR conversion, robust input protection, and flexible digital interfacing to simplify modular analog input design in harsh environments.

FAQ

What is the maximum input voltage range supported by the ADS8675IPW?

The ADS8675IPW supports nine software-programmable input ranges: bipolar options of ±12.288 V, ±10.24 V, ±6.144 V, ±5.12 V, and ±2.56 V; and unipolar options of 0–12.288 V, 0–10.24 V, 0–6.144 V, and 0–5.12 V. All ranges are internally calibrated for gain and offset, and the device maintains ≥1 MΩ input impedance regardless of selected range. The ADS8675IPW tolerates up to ±20 V on AIN_P/AIN_GND when AVDD = 5 V, providing robust field-wiring protection.

Does the ADS8675IPW require an external reference voltage?

No, the ADS8675IPW includes a highly stable on-chip 4.096-V reference with 4 ppm/°C temperature drift and 20-ms turn-on time. REFIO and REFCAP pins are used to connect decoupling capacitors (4.7 µF and 10 µF respectively) to maintain specified performance. An external reference can be applied to REFIO if higher initial accuracy or different voltage is needed, but it is not required for standard operation of the ADS8675IPW.

How does the multiSPI™ interface of the ADS8675IPW differ from standard SPI?

The multiSPI™ interface of the ADS8675IPW is backward-compatible with standard SPI (supporting CPOL/CPHA modes) but adds daisy-chain capability using SDO-0 and SDO-1 pins, and source-synchronous operation with either internal or external clock. Unlike basic SPI, multiSPI™ enables simultaneous readout of multiple ADS867x devices on one bus and provides RVS pin status signaling for precise timing alignment - features not available in conventional SPI peripherals used with the ADS8675IPW.

What is the purpose of the ALARM pin on the ADS8675IPW?

The ALARM pin on the ADS8675IPW is a hardware interrupt output that asserts high or low when the converted input voltage crosses user-programmable high or low thresholds. It operates independently of host SPI communication, enabling real-time fault detection without CPU polling. This feature is critical in safety-critical applications such as trackside signaling, where immediate response to out-of-range rail voltage is required - a key differentiator of the ADS8675IPW versus generic SAR ADCs.

What package type and thermal characteristics does the ADS8675IPW use?

The ADS8675IPW is housed in a 16-pin TSSOP package (5.00 mm × 4.40 mm) with a junction-to-ambient thermal resistance (RθJA) of 95.7°C/W. It is rated for operation from –40°C to +125°C and includes thermal metrics such as junction-to-board (RθJB = 41.5°C/W) and junction-to-case (top) (RθJC(top) = 29.3°C/W). These values are validated per JEDEC JESD51 standards and confirm suitability for convection-cooled industrial enclosures without forced airflow - a core specification for the ADS8675IPW in extended-temperature deployments.