Texas Instruments ADS8885IDGSR

Overview

ADS8885IDGSR 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 - deployed in precision instrumentation and medical data acquisition systems requiring high-resolution, low-latency digitization of differential sensor outputs.

For engineers reviewing the ADS8885IDGSR datasheet, ADS8885IDGSR pinout, ADS8885IDGSR application, or ADS8885IDGSR equivalent, this page delivers verified technical context, exact pin functions, real-world use cases, and validated alternative options - all grounded in TI's SBAS568A datasheet and official package documentation for the MSOP-10 (DGS) variant.

Technical Context

The ADS8885IDGSR implements a charge-redistribution SAR architecture with integrated sample-and-hold, enabling no-latency output and full-scale step settling in 1200 ns. Its true-differential input accepts –VREF to +VREF differential swing with 0 V to VREF common-mode range and ≥90 dB CMRR, eliminating need for external signal conditioning.

Digital interface supports 3-wire (CONVST as CS), 4-wire (DIN as CS), and daisy-chain modes over SPI-compatible timing - with SCLK up to 16 MHz, programmable busy indicator, and automatic power-down between conversions reducing current to 50 nA.

Key Specifications

Pinout & Package

ADS8885IDGSR is packaged in a 10-pin MSOP (DGS) with exposed thermal pad. Pin 1 is REF; pin 5 is GND (shared analog/digital ground); pin 10 is DVDD. Thermal pad must be connected to PCB ground per TI layout guidelines.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8885IDGSR, ADS8865IDRCT trades 2 bits of resolution for lower cost and identical footprint, whereas ADS8881IDGSR delivers 2.5× higher throughput in the same package - both retain true-differential input, SPI interface, and power-scaling behavior for seamless migration paths.

Availability

ADS8885IDGSR is available at Aetrix Electronics and suitable for precision instrumentation, portable medical devices, and automated test equipment requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for ADS8885IDGSR 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 ADS8885IDGSR belongs to TI's 18-bit SAR ADC family designed for high-accuracy, low-power, true-differential data acquisition in space-constrained, battery-sensitive, and metrology-grade applications.

FAQ

What is the maximum sampling rate supported by the ADS8885IDGSR?

The ADS8885IDGSR supports a maximum throughput rate of 400 kSPS with no latency and full 18-bit accuracy. At this rate, conversion time is ≤1300 ns and acquisition time is 1200 ns. Performance remains stable across the full operating temperature range (–40°C to +85°C) and supply conditions (AVDD = 2.7–3.6 V, DVDD = 1.65–3.6 V).

Does the ADS8885IDGSR require an external reference voltage?

Yes, the ADS8885IDGSR requires an external reference voltage applied to the REF pin. It accepts 2.5 V to 5 V, independent of AVDD, and demands a minimum 10 µF decoupling capacitor at the REF pin to ensure stable linearity and noise performance. The device does not include an internal reference.

Can the ADS8885IDGSR interface with a microcontroller using standard SPI?

Yes, the ADS8885IDGSR features an SPI-compatible serial interface supporting 3-wire, 4-wire, and daisy-chain configurations. It uses standard SPI timing conventions (MSB-first, SCLK-driven DOUT), with CONVST or DIN acting as chip select depending on mode - enabling direct connection to most MCU/FPGA SPI peripherals without protocol translation.

What is the input common-mode voltage range for the ADS8885IDGSR?

The ADS8885IDGSR supports a true-differential input with a common-mode voltage (VCM) range of 0 V to VREF. This allows flexible biasing - for example, VCM = VREF/2 yields ±VREF differential range, while VCM = 0.3×VREF supports asymmetric spans - all with ≥90 dB CMRR and no performance degradation.

How does power consumption scale with sampling rate in the ADS8885IDGSR?

ADS8885IDGSR power scales linearly with throughput: 2.6 mW at 400 kSPS, 0.65 mW at 100 kSPS, and 65 µW at 10 kSPS. This is achieved via automatic power-down between conversions, reducing AVDD current to 50 nA in idle state - making it ideal for duty-cycled or event-triggered sensing applications.