Texas Instruments ADS8699IPW

Overview

ADS8699IPW from Texas Instruments is an 18-bit, single-supply 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), 100 kSPS throughput, and on-chip 4.096-V reference. It delivers ±1.75 LSB INL, 92.5 dB SNR, and ±20 V input overvoltage protection, targeting precision industrial data acquisition systems requiring high dc accuracy and robust signal conditioning.

For engineers reviewing the ADS8699IPW datasheet, ADS8699IPW pinout, ADS8699IPW application, or ADS8699IPW equivalent, this page provides verified specifications, TSSOP-16 pin mapping, real-world use cases in analog input modules and semiconductor test equipment, and two validated alternative parts for design flexibility under extended temperature (–40°C to +125°C) and single 5-V supply constraints.

Technical Context

The ADS8699IPW implements a successive approximation register (SAR) ADC architecture with integrated PGA, second-order LPF, and overvoltage protection circuitry enabling direct connection to ±20 V field signals. Its software-programmable input ranges are calibrated per range for <±0.2 mV offset error and <±0.01% FSR gain error at 25°C.

It uses a multiSPI™ interface supporting daisy-chain configuration, backward-compatible with standard SPI, and offers three clocking modes: asynchronous CS-driven, source-synchronous external clock, and source-synchronous internal clock (15 ns period). The device maintains ≥1 MΩ constant resistive input impedance across all ranges and operates from a single 5-V AVDD with 1.65–3.3-V DVDD I/O compatibility.

Key Specifications

Pinout & Package

TSSOP-16 package (5.00 mm × 4.40 mm), thermally enhanced for industrial ambient operation up to +125°C; pin-compatible within ADS869x family.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8689IPW and AD7606C-18BSTZ, the ADS8699IPW uniquely combines 18-bit precision, integrated 4.096-V reference, ±20 V OVP, and software-programmable ranges in a compact TSSOP-16 footprint-making it optimal for space-constrained, single-channel industrial DAQ where self-contained accuracy and ruggedness are prioritized over channel count or speed.

Availability

ADS8699IPW is available at Aetrix Electronics and suitable for analog input modules, semiconductor test equipment, and LCD panel testing requiring stable component supply across extended temperature and high-precision signal acquisition.

Supply support for ADS8699IPW 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 ADS869x product line targets high-accuracy industrial data acquisition systems, integrating signal conditioning, protection, and conversion in a single IC to simplify front-end design for harsh-environment applications.

FAQ

What is the maximum sample rate of the ADS8699IPW?

The ADS8699IPW achieves a maximum throughput rate of 100 kSPS under recommended operating conditions (AVDD = 5 V, DVDD = 3.3 V). This corresponds to a 10-µs conversion cycle time, including both acquisition (5 µs) and conversion (5 µs) phases. The device maintains full 18-bit performance and specified INL/SNR across this rate, making it suitable for medium-speed precision applications such as motor current sensing and power quality monitoring.

Does the ADS8699IPW require an external reference voltage?

No, the ADS8699IPW includes an integrated 4.096-V reference with 4–7 ppm/°C temperature drift, eliminating the need for an external reference in most applications. However, the REFIO pin can accept an external reference (4.046–4.146 V) if higher initial accuracy or custom reference voltage is required. When using the internal reference, a 10-µF capacitor must be placed on the REFCAP pin for stable ADC operation.

How does the programmable input range work on the ADS8699IPW?

The ADS8699IPW supports nine software-configurable input ranges-five bipolar (±12.288 V, ±10.24 V, ±6.144 V, ±5.12 V, ±2.56 V) and four unipolar (0–12.288 V, 0–10.24 V, 0–6.144 V, 0–5.12 V)-selected by writing to the RANGE register. Each range is factory-calibrated for offset and gain error, ensuring ≤±0.2 mV and ≤±0.01% FSR accuracy at 25°C without user calibration. Range changes take effect after the next CONVST pulse.

What protection features does the ADS8699IPW offer against input overvoltage?

ADS8699IPW provides integrated input overvoltage protection up to ±20 V on AIN_P and AIN_GND pins when AVDD = 5 V, and up to ±15 V when AVDD is floating. This is achieved through internal clamping circuitry that prevents damage or latch-up during transient events. The device also guarantees no missing codes (NMC) and maintains specified INL/DNL performance even when subjected to overvoltage conditions within these limits.

Is the ADS8699IPW compatible with standard SPI interfaces?

Yes, the ADS8699IPW's multiSPI™ interface is fully backward-compatible with standard SPI protocols (CPOL = 0/1, CPHA = 0/1), supporting both rising- and falling-edge clocking. It also extends functionality with daisy-chain capability (via SDO-0/SDO-1), ALARM output as interrupt, and RVS status signaling. Timing parameters-including tSU_CSCK (7.5 ns), tD_CKDO (12 ns), and fCLK (up to 66.67 MHz)-meet or exceed conventional SPI requirements.