Texas Instruments ADS8866IDRCT

Overview

ADS8866IDRCT from Texas Instruments is a 16-bit, 100-kSPS, single-ended input SAR analog-to-digital converter with SPI-compatible serial interface, 93 dB SNR, ±2.0 LSB max INL, and 0.7 mW power dissipation at full speed - used in precision instrumentation and low-power medical sensors.

For engineers reviewing the ADS8866IDRCT datasheet, ADS8866IDRCT pinout, ADS8866IDRCT application, or ADS8866IDRCT equivalent, this page delivers verified electrical specs, package mapping to VSON-10, daisy-chain timing behavior, and real-world implementation constraints for battery-operated and ATE systems.

Technical Context

The ADS8866IDRCT implements a successive approximation register (SAR) architecture with no latency output and full-scale step settling in 1200 ns. It supports unipolar single-ended inputs (0 V to VREF) with independent reference supply (2.5 V–5 V), decoupled from AVDD (2.7 V–3.6 V) and DVDD (1.65 V–3.6 V).

Its SPI-compatible interface operates in 3-wire (CONVST as CS), 4-wire (DIN as CS), or daisy-chain modes, with SCLK up to 66.6 MHz and guaranteed timing margins including tACQ = 1200 ns and td-CNV-DO = 12.3 ns. Power-down current is 50 nA on AVDD.

Key Specifications

Pinout & Package

VSON-10 (DRC) package: 3.0 mm × 3.0 mm, exposed thermal pad (to be connected to PCB ground). Pin count: 10. Thermal resistance RθJB = 45.9°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit SAR ADC applications.

Compared with ADS8866IDRCT, ADS8864IDRCT trades single-ended simplicity for differential performance and speed, while ADS8860IDRCT prioritizes throughput over DC linearity - making ADS8866IDRCT the optimal balance for precision, low-power, single-ended applications.

Availability

ADS8866IDRCT is available at Aetrix Electronics and suitable for automatic test equipment, precision instrumentation, and portable medical devices requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for ADS8866IDRCT 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 ICs.

The ADS8866 belongs to TI's precision SAR ADC portfolio designed for high-resolution, low-power, single-ended measurement systems - targeting applications where DC accuracy, noise floor, and supply flexibility outweigh raw speed requirements.

FAQ

What is the maximum SCLK frequency supported by ADS8866IDRCT?

The ADS8866IDRCT supports SCLK frequencies up to 66.6 MHz under recommended operating conditions (AVDD = 3 V, DVDD = 3 V). This timing margin ensures reliable data capture in 3-wire, 4-wire, and daisy-chain configurations - validated across –40°C to +85°C. The ADS8866IDRCT datasheet specifies minimum tSCLK = 15 ns (66.6 MHz) and maximum tSCLK = 62.5 ns (16 MHz) for guaranteed operation.

Does ADS8866IDRCT support true differential input?

No, the ADS8866IDRCT supports only unipolar single-ended analog inputs (AINP referenced to AINN, which is internally tied to GND). Its input structure is explicitly defined as single-ended in the device description, pin functions, and electrical characteristics. For true-differential input, TI recommends ADS8867 or ADS8887 - not functional equivalents for ADS8866IDRCT.

What is the purpose of the thermal pad on the ADS8866IDRCT VSON-10 package?

The exposed thermal pad on the ADS8866IDRCT (DRC package) must be soldered to the PCB ground plane to achieve specified thermal performance: RθJB = 45.9°C/W. Leaving it floating degrades junction-to-board thermal resistance and risks exceeding maximum junction temperature under sustained 100-kSPS operation. TI documentation confirms this pad is electrically connected to GND internally.

Can ADS8866IDRCT operate with AVDD = 2.7 V and REF = 5 V simultaneously?

Yes - the ADS8866IDRCT explicitly supports independent supply domains: AVDD may be as low as 2.7 V while REF is set to 5 V, per Section 7.3 (Recommended Operating Conditions) and Section 3 (Description). This configuration enables wide input dynamic range (0 V to 5 V) without boosting AVDD, reducing system power and complexity.

Is ADS8866IDRCT pin-compatible with other devices in the ADS88xx family?

The ADS8866IDRCT shares the VSON-10 (DRC) and VSSOP-10 (DGS) footprints with ADS8860/62/64/65/67, but pin functions differ significantly - especially for AINN (grounded in ADS8866IDRCT vs active differential input in others). Therefore, ADS8866IDRCT is not pin-compatible with any other ADS88xx variant; PCB layout must be specific to its single-ended pinout.