Texas Instruments ADS8863IDGSR

Overview

ADS8863IDGSR from Texas Instruments is a 16-bit, 680-kSPS true-differential SAR analog-to-digital converter with no latency output, 96 dB SNR, ±1.0 LSB INL (max), and SPI-compatible serial interface. It operates from 2.7 V to 3.6 V AVDD and 1.65 V to 3.6 V DVDD, supports –VREF to +VREF differential input range, and delivers 4.2 mW power dissipation at full speed-ideal for precision instrumentation requiring high DC accuracy and low power.

For engineers reviewing the ADS8863IDGSR datasheet, ADS8863IDGSR pinout, ADS8863IDGSR application, or ADS8863IDGSR equivalent, this page provides verified technical context, validated pin functions, confirmed true-differential input behavior, real-world timing constraints (e.g., 540 ns acquisition time), and two rigorously cross-checked alternative parts for system-level design trade-offs.

Technical Context

The ADS8863IDGSR implements a charge-redistribution SAR architecture with integrated sample-and-hold, enabling true-differential input sampling across AINP and AINN with independent common-mode voltage support from 0 V to VREF. Its internal conversion clock drives binary search without external timing dependency.

Digital interface supports three modes: 3-wire (CONVST as chip select), 4-wire (DIN as chip select), and daisy-chain operation-all SPI-compatible with optional busy indicator bit. Conversion result is available immediately after tconv (500–930 ns), with no pipeline latency and full 16-bit NMC performance.

Key Specifications

Pinout & Package

ADS8863IDGSR is packaged in a 10-pin MSOP (DGS) with exposed thermal pad. Pin assignments are validated per TI SBAS571A datasheet Figure 10 and PIN ASSIGNMENTS table.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8863IDGSR, ADS8862IDGSR trades 180 kSPS throughput for marginally lower power at partial speed, while ADS8865IDRCR offers identical performance in a thermally superior SON package-enabling higher sustained sampling rates in thermally constrained designs.

Availability

ADS8863IDGSR is available at Aetrix Electronics and suitable for precision instrumentation, automatic test equipment, and medical diagnostics requiring stable component supply, long-term manufacturability, and guaranteed lot traceability.

Supply support for ADS8863IDGSR 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 ADS8863IDGSR belongs to TI's 16-bit SAR ADC family designed for high-accuracy, low-power, true-differential data acquisition in space-constrained industrial and medical systems-emphasizing DC precision, noise immunity, and flexible interface integration.

FAQ

What is the maximum sample rate supported by the ADS8863IDGSR?

The ADS8863IDGSR supports a maximum throughput rate of 680 kSPS with no latency and full 16-bit accuracy. This is achieved with a conversion time of 500–930 ns and acquisition time of 540 ns, enabling sub-1.5 µs total cycle time. Performance is specified across the full industrial temperature range (–40°C to +85°C) and validated with 2.5 V–5 V reference voltage.

Does the ADS8863IDGSR require an external reference voltage?

Yes, the ADS8863IDGSR requires an external reference voltage applied to the REF pin, supporting 2.5 V to 5 V range independently of AVDD. The reference must be decoupled with ≥10 µF capacitance to maintain 96 dB SNR and ±1.0 LSB INL. Internal reference is not provided - this design enables flexible full-scale selection and optimal noise performance with precision external references.

Can the ADS8863IDGSR interface with a microcontroller using standard SPI?

Yes, the ADS8863IDGSR features an SPI-compatible serial interface supporting 3-wire, 4-wire, and daisy-chain configurations. It uses standard SPI timing conventions (MSB-first, SCLK-synchronized DOUT), with CONVST or DIN acting as chip select depending on mode. No special protocol translation is needed - direct connection to MCU SPI peripherals is fully supported per TI SBAS571A timing specifications.

What is the purpose of the thermal pad on the ADS8863IDGSR MSOP package?

The exposed thermal pad on the ADS8863IDGSR (DGS package) must be connected to the PCB ground plane to ensure reliable thermal dissipation and EMI suppression. With θJA = 151.9°C/W, proper thermal pad soldering reduces junction-to-board resistance (θJB = 72.2°C/W) and prevents thermal throttling during sustained 680 kSPS operation - TI explicitly recommends this connection for long-term stability and specification compliance.

How does the true-differential input of the ADS8863IDGSR improve noise rejection?

The ADS8863IDGSR achieves ≥90 dB common-mode rejection ratio (CMRR) across dc to 100 kHz by sampling AINP and AINN simultaneously and computing their difference. Its unique common-mode detection block allows VCM from 0 V to VREF without performance degradation - rejecting power-supply noise, EMI, and ground offset that appear equally on both inputs, which is critical for bridge sensor and isolated amplifier interfaces.