Texas Instruments ADS8885IDRCT

Overview

ADS8885IDRCT from Texas Instruments is an 18-bit, 400-kSPS true-differential SAR analog-to-digital converter with SPI-compatible serial interface, 100 dB SNR, ±3.0 LSB max INL, and 2.6 mW power dissipation at full speed. It operates from 2.7 V to 3.6 V AVDD and supports external reference voltages from 2.5 V to 5 V. It is used in precision instrumentation where high resolution, low noise, and differential signal integrity are critical.

For engineers reviewing the ADS8885IDRCT datasheet, ADS8885IDRCT pinout, ADS8885IDRCT application, or ADS8885IDRCT equivalent, key selection considerations include its true-differential input range (–VREF to +VREF), 90 dB min CMRR over 0 V to VREF common-mode range, no-latency output architecture, and MSOP-10/SON-10 package compatibility for space-constrained PCB layouts.

Technical Context

The ADS8885IDRCT employs a charge-redistribution SAR architecture with integrated sample-and-hold, enabling single-cycle acquisition and conversion without pipeline latency. Its true-differential input structure allows independent common-mode voltage setting (0 V to VREF) while maintaining 90 dB CMRR - a feature enabled by an internal common-mode detection and rejection block.

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 up to 16 MHz SCLK. Power consumption scales linearly with throughput (65 µW at 10 kSPS, 2.6 mW at 400 kSPS), and automatic power-down occurs between conversions.

Key Specifications

Pinout & Package

ADS8885IDRCT is available in a 10-pin SON (DRC) package with exposed thermal pad, optimized for low-inductance grounding and thermal management in high-density layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8885IDRCT, ADS8865IDRCT trades 2 bits of resolution and 10 dB SNR for lower cost and identical layout, while ADS8881IDRCT delivers 2.5× higher throughput at the expense of supply flexibility and package size - making ADS8885IDRCT optimal for space- and power-constrained 18-bit applications.

Availability

ADS8885IDRCT is available at Aetrix Electronics and suitable for high-precision instrumentation, portable medical diagnostics, and industrial process control requiring stable component supply and long-term manufacturability.

Supply support for ADS8885IDRCT 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 high-performance signal chain solutions.

The ADS8885IDRCT belongs to TI's precision SAR ADC portfolio designed for applications demanding high DC accuracy, low power, and true-differential input flexibility - particularly in test & measurement, medical, and industrial sensing.

FAQ

What is the absolute maximum input voltage range for AINP and AINN on the ADS8885IDRCT?

The ADS8885IDRCT specifies an absolute maximum input voltage of –0.3 V to (REF + 0.3 V) for both AINP and AINN relative to GND. Exceeding this range risks ESD diode conduction and potential damage. The recommended operating input range is –0.1 V to (VREF + 0.1 V) under normal conditions, with full differential span limited to –VREF to +VREF.

Does the ADS8885IDRCT require an external reference, and what are the supported voltage ranges?

Yes, the ADS8885IDRCT requires an external reference applied to the REF pin. It supports reference voltages from 2.5 V to 5 V, independent of AVDD and DVDD supply levels. A minimum 10 µF decoupling capacitor is required at the REF pin to maintain stability and minimize noise-induced errors during conversion.

How does the common-mode voltage affect the full-scale input range of the ADS8885IDRCT?

The ADS8885IDRCT allows the common-mode voltage (VCM = (AINP + AINN)/2) to range from 0 V to VREF without degrading performance. At VCM = VREF/2, the full-scale differential input is –VREF to +VREF. For other VCM values, the usable differential range adjusts per Table 4 in the datasheet - e.g., at VCM = 0.3 × VREF, the range becomes –0.6 × VREF to +0.6 × VREF.

Can the ADS8885IDRCT operate with different supply voltages for AVDD and DVDD?

Yes, the ADS8885IDRCT supports independent supply domains: AVDD operates from 2.7 V to 3.6 V for analog circuitry, while DVDD operates from 1.65 V to 3.6 V for digital I/O. This allows interfacing with low-voltage microcontrollers (e.g., 1.8 V DVDD) while maintaining optimal analog performance with 3.3 V AVDD - enhancing system-level voltage domain flexibility.

What digital interface modes does the ADS8885IDRCT support, and how is mode selection configured?

The ADS8885IDRCT supports three SPI-compatible modes: 3-wire (CONVST as CS), 4-wire (DIN as CS), and daisy-chain. Mode selection is determined by the DIN logic level at the rising edge of CONVST: DIN = high selects 3-wire mode; DIN = low selects 4-wire or daisy-chain depending on subsequent timing. No register writes are needed - configuration is hardware-driven at conversion start.