Texas Instruments ADS8863IDRCR

Overview

ADS8863IDRCR 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, 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, supporting unipolar differential input ranges from –VREF to +VREF with 90 dB CMRR - ideal for precision instrumentation signal acquisition.

For engineers reviewing the ADS8863IDRCR datasheet, ADS8863IDRCR pinout, ADS8863IDRCR application, or ADS8863IDRCR equivalent, key selection considerations include its true-differential input architecture, 540 ns full-scale settling time, daisy-chain capability, low 4.2 mW power at full speed, and SON-10 (DRC) package thermal performance.

Technical Context

The ADS8863IDRCR employs a charge-redistribution SAR architecture with integrated sample-and-hold, enabling zero-latency output and inherent rejection of common-mode noise across its full 0 V to VREF common-mode range. Its internal conversion clock drives binary search on a capacitor array, with sampling switches exhibiting 96 Ω on-resistance and 55 pF sampling capacitance per input.

Digital interface supports three modes: 3-wire (CONVST as CS), 4-wire (DIN as CS), and daisy-chain - all SPI-compatible with optional busy indicator bit. Conversion timing is deterministic: 500–930 ns conversion time, 540 ns acquisition time, and 1470 ns minimum inter-conversion interval at 680 kSPS.

Key Specifications

Pinout & Package

ADS8863IDRCR is packaged in a 10-pin SON (Small Outline No-Lead) package (DRC), featuring an exposed thermal pad for enhanced thermal dissipation. The package measures 3.0 mm × 3.0 mm × 0.9 mm and is RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8863IDRCR, ADS8862IDRCR trades 180 kSPS throughput for marginally lower power and cost, while ADS8865IDRCT offers identical resolution at reduced speed in a thermally less efficient package - making ADS8863IDRCR optimal for high-speed, thermally demanding, true-differential applications.

Availability

ADS8863IDRCR is available at Aetrix Electronics and suitable for precision instrumentation, medical diagnostics, process control, and battery-powered field sensors requiring stable component supply and long-term manufacturability.

Supply support for ADS8863IDRCR 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 ADS8863IDRCR belongs to TI's 16-bit true-differential SAR ADC family, engineered for high-accuracy, low-power, and noise-immune signal acquisition in instrumentation, medical, and industrial control systems.

FAQ

What is the maximum sample rate supported by the ADS8863IDRCR?

The ADS8863IDRCR supports a maximum throughput rate of 680 kSPS with no latency output. This is achieved using its internal conversion clock and deterministic timing - confirmed in the Electrical Characteristics table under "Maximum throughput rate" with tconv ≤ 930 ns and 1/fsample ≥ 1470 ns. The ADS8863IDRCR maintains full 16-bit performance at this rate, including 96 dB SNR and ±1.0 LSB INL.

Does the ADS8863IDRCR require an external reference voltage?

Yes, the ADS8863IDRCR requires an external reference voltage applied to the REF pin, which must be between 2.5 V and 5 V. The reference is independent of AVDD and directly defines the full-scale differential input range (–VREF to +VREF). A minimum 10 µF decoupling capacitor is mandatory at the REF pin to stabilize the reference during capacitor-switching events and preserve linearity.

Can the ADS8863IDRCR interface with a microcontroller using standard SPI?

Yes, the ADS8863IDRCR 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 - it interfaces directly with MCU SPI peripherals, including those on ARM Cortex-M and MSP430 families.

What is the purpose of the thermal pad on the ADS8863IDRCR SON-10 package?

The exposed thermal pad on the ADS8863IDRCR (DRC package) provides a low-thermal-resistance path from the die to the PCB ground plane, achieving θJA = 111.1°C/W. Texas Instruments explicitly recommends connecting it to PCB ground to maintain junction temperature within specification under continuous 680 kSPS operation - especially critical in compact, sealed enclosures with limited airflow.

How does the true-differential input of the ADS8863IDRCR improve noise rejection?

The ADS8863IDRCR's true-differential input achieves ≥90 dB common-mode rejection ratio (CMRR) across 0 V to VREF common-mode voltage, rejecting coupled noise (e.g., 50/60 Hz interference) without requiring matched external resistor networks. Its internal common-mode detection and rejection block allows VCM to vary freely - unlike conventional differential-input ADCs - preserving accuracy even with unbalanced sensor cabling or floating sources.