Texas Instruments ADS8887IDGS

Overview

ADS8887IDGS from Texas Instruments is an 18-bit, 100-kSPS, true-differential SAR analog-to-digital converter with SPI-compatible serial interface, 100 dB SNR, ±3.0 LSB max INL, and 0.7 mW power dissipation at full speed-designed for precision instrumentation requiring high-resolution signal capture from differential sensor outputs.

For engineers reviewing the ADS8887IDGS datasheet, ADS8887IDGS pinout, ADS8887IDGS application, or ADS8887IDGS equivalent, this page delivers verified technical context, exact pin functions, real-world use cases in medical and industrial systems, and two validated alternative parts with documented functional and application-level differences.

Technical Context

The ADS8887IDGS implements a charge-redistribution SAR architecture with integrated sample-and-hold, enabling true-differential input operation across AINP/AINN with common-mode voltage range of 0 V to VREF and ≥90 dB CMRR. Its internal conversion clock eliminates external timing dependencies, while acquisition and conversion phases are strictly separated to ensure no latency output.

Digital interface supports three modes-3-wire CS, 4-wire CS, and daisy-chain-selected dynamically via DIN level at CONVST rising edge. Power consumption scales linearly with throughput (70 µW at 10 kSPS; 0.7 mW at 100 kSPS), and device enters automatic 50 nA power-down state between conversions.

Key Specifications

Pinout & Package

ADS8887IDGS is packaged in a 10-pin VSSOP (DGS) with exposed thermal pad. This thermally enhanced package supports reliable operation at full throughput in industrial ambient conditions and requires PCB ground connection to the thermal pad per TI design guidelines.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8887IDGS, ADS8867IDGS trades 2 bits of resolution and 4 dB SNR for lower cost and identical form factor, while ADS8885IPWR delivers 4× speed in a non-pin-compatible package - making ADS8887IDGS optimal for space-constrained, battery-powered 18-bit applications needing daisy-chain scalability.

Availability

ADS8887IDGS is available at Aetrix Electronics and suitable for precision medical equipment, industrial process controls, and low-power battery-operated instruments requiring stable component supply and long-term production continuity.

Supply support for ADS8887IDGS 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 ADS8887IDGS belongs to TI's 18-bit SAR ADC family engineered for high-accuracy, low-power, true-differential signal acquisition in instrumentation, medical, and portable test equipment - emphasizing resolution integrity, thermal stability, and interface flexibility.

FAQ

What is the maximum recommended reference voltage for ADS8887IDGS?

The ADS8887IDGS supports an external reference voltage from 2.5 V to 5 V. The maximum rated value is 5 V, as confirmed by absolute maximum ratings (REF to GND: –0.3 V to 5.7 V). Operating at 5 V maximizes differential input range (–5 V to +5 V) and achieves best SNR (100 dB) and SFDR (115 dB) per datasheet testing conditions. Exceeding 5 V risks permanent damage.

Does ADS8887IDGS require an external clock for conversion?

No, ADS8887IDGS uses an internal conversion clock and does not require an external clock source for sampling. The SCLK signal is used solely for serial data readout after conversion completes. Conversion timing is governed by internal logic with tconv ranging from 500 ns to 8.8 µs - independent of SCLK frequency, which can run up to 16 MHz for interface timing compliance.

Can ADS8887IDGS interface directly with a 1.8-V microcontroller?

Yes, ADS8887IDGS supports DVDD from 1.65 V to 3.6 V, making it fully compatible with 1.8-V logic interfaces. When DVDD = 1.8 V, VIH is defined as 0.7 × DVDD = 1.26 V (min) and VOL is 0.2 × DVDD = 0.36 V (max), aligning with standard 1.8-V CMOS thresholds. No level-shifting circuitry is needed for bidirectional DIN/DOUT/SCLK communication.

What is the purpose of the thermal pad on ADS8887IDGS (DGS package)?

The exposed thermal pad on ADS8887IDGS serves as the primary heat dissipation path, reducing junction-to-board thermal resistance to 72.2°C/W. Texas Instruments explicitly recommends connecting it to PCB ground plane using multiple vias to maximize thermal performance and ensure reliable operation at full 100-kSPS throughput across –40°C to +85°C ambient temperatures.

How does ADS8887IDGS achieve true-differential input with variable common-mode voltage?

ADS8887IDGS incorporates a dedicated common-mode voltage detection and rejection block that allows AINP and AINN to operate with any common-mode voltage from 0 V to VREF - unlike conventional differential SAR ADCs constrained to ~10% mid-scale deviation. This enables direct connection of unconditioned sensor outputs (e.g., bridge amplifiers) without external biasing, preserving signal integrity and simplifying front-end design.