Texas Instruments ADS8881IDGSR

Overview

ADS8881IDGSR from Texas Instruments is an 18-bit, 1-MSPS, true-differential SAR analog-to-digital converter with SPI-compatible serial interface, –VREF to +VREF input range, 90 dB CMRR, and 100 dB SNR at 1 kHz - used in precision instrumentation and low-power medical data acquisition systems.

For engineers reviewing the ADS8881IDGSR datasheet, ADS8881IDGSR pinout, ADS8881IDGSR application, or ADS8881IDGSR equivalent, this page delivers verified electrical specs, package mapping (VSSOP-10), daisy-chain timing, power-scaling behavior, and real-world use context for high-resolution, low-latency signal digitization.

Technical Context

The ADS8881IDGSR implements a successive approximation register (SAR) architecture with no latency output and full-scale settling in 290 ns. Its true-differential front-end accepts inputs from –VREF to +VREF with common-mode voltage programmable from 0 V to VREF, enabling flexible sensor interfacing without external level-shifting.

It supports three SPI modes: 3-wire (CONVST as CS), 4-wire (DIN as CS), and daisy-chain - all with optional busy-indicator bit. Power consumption scales linearly with throughput: 5.5 mW at 1 MSPS, 55 µW at 10 kSPS, and 50 nA in power-down state.

Key Specifications

Pinout & Package

VSSOP-10 (DGSR) package: 3.00 mm × 3.00 mm body, 0.5 mm pitch, exposed thermal pad connected to GND per TI recommendation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8881IDGSR, ADS8861IPWR trades resolution and differential capability for lower cost and simpler layout, while AD7606C-18BSTZ adds channel integration and built-in signal conditioning at the expense of power efficiency and reference configurability - making ADS8881IDGSR optimal for single-channel, externally referenced, low-power precision systems.

Availability

ADS8881IDGSR is available at Aetrix Electronics and suitable for automatic test equipment, precision instrumentation, and portable medical devices requiring stable component supply, long-term manufacturability, and guaranteed TI production status.

Supply support for ADS8881IDGSR 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 ADS8881IDGSR belongs to TI's high-performance SAR ADC product line, designed specifically for applications demanding 18-bit resolution, sub-µV noise floors, and micro-power operation in space-constrained, battery-aware systems.

FAQ

What is the maximum recommended reference voltage for ADS8881IDGSR?

The ADS8881IDGSR supports an external reference voltage from 2.5 V to 5 V. The absolute maximum rating for the REF pin is 5.7 V, but operation above 5 V is not characterized or guaranteed. For optimal 18-bit performance and full-scale linearity, TI specifies VREF = 5 V in all AC/DC characterization conditions - and the device achieves 100 dB SNR and ±2 LSB INL max only within the 2.5 V–5 V operating range. Using VREF > 5 V risks violating absolute maximum ratings and invalidating specifications.

Does ADS8881IDGSR support daisy-chain configuration with other ADCs?

Yes, ADS8881IDGSR supports daisy-chain operation with identical or compatible TI SAR ADCs (e.g., ADS8885, ADS8883) using a shared SCLK and CONVST signal. In daisy-chain mode, DOUT of one device connects to DIN of the next, allowing sequential readout of conversion results over a single SPI bus. Timing parameters such as tsu-DI-CK (1.5 ns) and th-CK-CNV (5 ns) are explicitly specified in the datasheet for this mode, and the feature is validated across the full –40°C to +85°C temperature range for ADS8881IDGSR.

What is the power-down current specification for ADS8881IDGSR?

The ADS8881IDGSR draws 50 nA typical power-down current from the AVDD supply when placed in shutdown mode at the end of conversion. This value is measured under AVDD = 3 V, TA = 25°C, and is guaranteed across the full operating temperature range (–40°C to +85°C for ADS8881I grade). The device automatically enters power-down after each conversion cycle unless continuously clocked, making it ideal for intermittent-sampling applications like portable data loggers where quiescent current directly impacts battery lifetime.

Can ADS8881IDGSR operate with different analog and digital supply voltages?

Yes, ADS8881IDGSR supports independent analog (AVDD) and digital (DVDD) supplies: AVDD ranges from 2.7 V to 3.6 V, and DVDD ranges from 1.65 V to 3.6 V depending on SCLK frequency (≥40 MHz requires DVDD ≥ 2.7 V). This separation allows interfacing with low-voltage FPGAs or MCUs while maintaining analog performance, and is confirmed in Section 8.3 (Recommended Operating Conditions) and Table 8.5 of the SBAS547D datasheet. GND is the sole common reference between both domains.

What package type does ADS8881IDGSR use, and is thermal pad connection required?

ADS8881IDGSR uses the VSSOP-10 (DGSR) package: 3.0 mm × 3.0 mm body, 0.5 mm pitch, with an exposed thermal pad. TI explicitly recommends connecting this thermal pad to PCB ground to improve thermal performance and ensure reliable operation at maximum throughput. The pad is electrically tied to GND internally, and proper soldering and grounding reduce junction-to-board thermal resistance (RθJB = 72.2°C/W) - critical for maintaining 1-MSPS performance in enclosed or high-ambient environments.