Texas Instruments ADS8695IPW

Overview

ADS8695IPW from Texas Instruments is an 18-bit, single-supply SAR analog-to-digital converter with integrated analog front-end, 500 kSPS throughput, ±12.288 V to ±2.56 V software-programmable bipolar input ranges, on-chip 4.096-V reference (7 ppm/°C drift), and multiSPI™ interface. It serves as a precision data acquisition channel in industrial PLC analog input modules requiring high DC accuracy and overvoltage robustness.

For engineers reviewing the ADS8695IPW datasheet, ADS8695IPW pinout, ADS8695IPW application, or ADS8695IPW equivalent, this page delivers verified specifications, TSSOP-16 pin mapping, real-world use cases in semiconductor test and LCD panel validation, and two confirmed alternative parts with documented functional and application differences.

Technical Context

The ADS8695IPW implements a successive approximation register (SAR) ADC core with integrated PGA, second-order LPF, overvoltage protection (±20 V), and programmable gain/offset calibration per input range. Its analog front-end maintains ≥1 MΩ resistive input impedance across all 9 software-selectable ranges.

It operates from a single 5-V analog supply (AVDD = 4.75–5.25 V) while supporting 1.65–3.3-V I/O logic (DVDD), features ALARM output for high/low threshold monitoring, and uses a multiSPI™ interface compatible with standard SPI protocols and daisy-chain topologies.

Key Specifications

Pinout & Package

TSSOP-16 package (5.00 mm × 4.40 mm), thermally enhanced for industrial ambient operation up to +125°C; JEDEC MS-012AC compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8691IPW and ADS8699IPW, the ADS8695IPW delivers the optimal balance of speed (500 kSPS), precision (±1.5 LSB INL), and robustness (±20 V OVP) for industrial analog input modules and semiconductor test fixtures where mid-range throughput and guaranteed DC performance are prioritized.

Availability

ADS8695IPW is available at Aetrix Electronics and suitable for industrial analog input modules, semiconductor parametric test systems, and LCD panel validation equipment requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for ADS8695IPW 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 signal chain solutions.

The ADS869x family was designed specifically for high-reliability industrial data acquisition, integrating SAR ADC, programmable AFE, overvoltage protection, and flexible digital interface into a single TSSOP package for simplified system design.

FAQ

What is the maximum sampling rate of the ADS8695IPW?

The ADS8695IPW has a fixed maximum sampling rate of 500 kSPS, corresponding to a 1000-ns conversion time and 1000-ns acquisition time. This rate is guaranteed across the full operating temperature range (–40°C to +125°C) and does not vary with input range selection or reference configuration. The ADS8695IPW achieves this performance using its integrated SAR core and optimized analog front-end without requiring external clock multiplication or oversampling.

Does the ADS8695IPW require an external reference voltage?

No, the ADS8695IPW includes a fully integrated 4.096-V reference with 4–7 ppm/°C temperature drift and requires only a 10-μF capacitor on the REFCAP pin. The REFIO pin can be configured as either reference output (default) or external reference input (4.046–4.146 V), but external reference use is optional and trades off drift performance for flexibility. Internal reference operation is the default and recommended configuration for highest DC accuracy.

How does the input overvoltage protection work on the ADS8695IPW?

The ADS8695IPW provides ±20 V input overvoltage protection on AIN_P and AIN_GND pins when AVDD = 5 V, and ±15 V protection when AVDD is floating. This is implemented via integrated clamping circuitry that activates before damage thresholds are reached, eliminating the need for external TVS diodes in most industrial field applications. Protection remains active across all software-programmed input ranges and does not degrade input impedance or linearity.

Can the ADS8695IPW interface with a microcontroller using standard SPI?

Yes, the ADS8695IPW's multiSPI™ interface is fully backward-compatible with standard SPI protocols (CPOL = 0/1, CPHA = 0/1). It supports all four SPI modes, uses standard SCLK/SDI/SDO-0 pins, and requires no special initialization sequence. The ALARM and RVS pins provide additional status signaling, and daisy-chain capability allows multiple ADS8695IPW devices to share a single SPI bus with minimal GPIO overhead.

What is the input impedance of the ADS8695IPW across its programmable ranges?

The ADS8695IPW maintains a minimum input impedance of ≥1 MΩ across all 9 programmable input ranges (bipolar and unipolar), with typical values between 1.02 MΩ and 1.38 MΩ depending on range selection. This constant, high-impedance characteristic is achieved through its integrated analog front-end architecture and ensures consistent loading on sensor sources regardless of software-configured span - critical for maintaining signal integrity in high-impedance sensor interfaces.