Texas Instruments ADS8887IDRCT

Overview

ADS8887IDRCT 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 - deployed in precision medical instrumentation requiring high-resolution DC-coupled sensor digitization.

For engineers reviewing the ADS8887IDRCT datasheet, ADS8887IDRCT pinout, ADS8887IDRCT application, or ADS8887IDRCT equivalent, this page delivers verified technical context, package-specific pin functions, real-world use-value per application, and two validated alternative parts with documented functional and selection trade-offs.

Technical Context

The ADS8887IDRCT implements a charge-redistribution SAR architecture with integrated sample-and-hold, enabling no-latency output and full-scale 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 in bridge or isolated sensor interfaces.

Digital interface supports three modes: 3-wire CS (CONVST as chip select), 4-wire CS (DIN as chip select), and daisy-chain (for multi-ADC synchronization). Conversion timing is internally clocked; SCLK only controls data readout during acquisition phase, decoupling sampling rate from serial clock frequency.

Key Specifications

Pinout & Package

ADS8887IDRCT is packaged in a 10-pin SON (DRC) thermally enhanced leadless package (3 mm × 3 mm, 0.5 mm pitch) with exposed thermal pad connected to PCB ground for optimal thermal performance and noise immunity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8887IDRCT, ADS8867IDRCT trades 2 bits of resolution and 30 dB SNR for lower cost and identical form factor, while ADS8885IPWR delivers 4× higher throughput at the expense of power, size, and interface flexibility - making ADS8887IDRCT optimal for space-constrained, battery-aware 18-bit precision applications.

Availability

ADS8887IDRCT is available at Aetrix Electronics and suitable for precision medical equipment, industrial process controllers, and battery-operated portable instrumentation requiring stable component supply and long-term production continuity.

Supply support for ADS8887IDRCT 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 ADS8887IDRCT belongs to TI's 18-bit SAR ADC family engineered for high-accuracy, low-power, true-differential signal acquisition in medical, test, and industrial systems - emphasizing metrology-grade linearity, noise immunity, and flexible interface scalability.

FAQ

What is the maximum recommended reference voltage for ADS8887IDRCT?

The ADS8887IDRCT supports an external reference voltage from 2.5 V to 5 V, with 5 V being the absolute maximum per absolute ratings. Operating at 5 V maximizes dynamic range (–5 V to +5 V differential input) and SNR (100 dB), but requires proper decoupling with ≥10 µF capacitor on the REF pin to maintain linearity and avoid reference droop during conversion.

Does ADS8887IDRCT require an external clock for conversion?

No - the ADS8887IDRCT uses an internal conversion clock; SCLK is only required for serial data readout during the acquisition phase. This architecture isolates conversion timing from digital interface jitter, ensuring consistent 100 kSPS throughput regardless of SCLK stability or frequency (up to 16 MHz), and eliminates need for external timing components.

Can ADS8887IDRCT interface directly with a 1.8 V microcontroller?

Yes - ADS8887IDRCT supports DVDD from 1.65 V to 3.6 V, making it fully compatible with 1.8 V digital domains. When DVDD = 1.8 V, logic thresholds are VIH ≥ 1.26 V and VIL ≤ 0.54 V, matching standard 1.8 V CMOS I/O. The DOUT driver is specified down to 1.65 V, ensuring reliable level compatibility without level shifters.

What is the purpose of the thermal pad on ADS8887IDRCT?

The exposed thermal pad on ADS8887IDRCT serves dual purposes: thermal conduction (θJB = 45.9°C/W) and low-impedance grounding. It must be soldered to a PCB copper pour connected to GND to reduce junction temperature rise and suppress ground bounce-induced noise coupling into the analog section - omission degrades SNR and may cause thermal shutdown under sustained 100 kSPS operation.

How does ADS8887IDRCT handle common-mode voltage variations?

The ADS8887IDRCT features a dedicated common-mode voltage detection and rejection block that supports any VCM from 0 V to VREF without performance degradation - unlike conventional SAR ADCs limited to ~10% mid-scale deviation. This enables direct digitization of differential signals with floating or variable common-mode offsets, such as those from isolated amplifiers or transformer-coupled sensors.