Texas Instruments ADS8865IDRCT

Overview

ADS8865IDRCT from Texas Instruments is a 16-bit, 400-kSPS true-differential SAR analog-to-digital converter with no latency output, SPI-compatible serial interface, and daisy-chain capability. It operates with 2.7–3.6 V AVDD, 1.65–3.6 V DVDD, and 2.5–5 V external reference, delivering 96 dB SNR and ±1.0 LSB INL across –40°C to +85°C. It enables precision signal acquisition in low-power instrumentation and medical equipment.

For engineers reviewing the ADS8865IDRCT datasheet, ADS8865IDRCT pinout, ADS8865IDRCT application, or ADS8865IDRCT equivalent, this page provides verified technical context, validated pin functions, confirmed differential input behavior, real-world power-scaling performance (2.6 mW at 400 kSPS), and two documented alternative parts for design flexibility.

Technical Context

The ADS8865IDRCT uses charge-redistribution SAR architecture with integrated sample-and-hold, supporting true-differential inputs (AINP/AINN) where common-mode voltage (VCM) ranges freely from 0 V to VREF without degrading CMRR (≥90 dB). Its internal conversion clock eliminates external timing dependencies while enabling precise 1200 ns full-scale step settling.

Digital interface supports three modes-3-wire (CONVST as CS), 4-wire (DIN as CS), and daisy-chain-with SCLK up to 16 MHz and optional busy indicator bit. Power consumption scales linearly with throughput: 65 µW at 10 kSPS, 0.65 mW at 100 kSPS, and 2.6 mW at 400 kSPS, with 50 nA power-down current.

Key Specifications

Pinout & Package

ADS8865IDRCT is housed in a 10-pin SON (DRC) package with exposed thermal pad. The package supports fine-pitch PCB layout and efficient heat dissipation when the thermal pad is connected to PCB ground.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8864IDRCT, the ADS8865IDRCT delivers 60% higher throughput with identical power efficiency per sample; versus ADS8867IDRCT, it adds true-differential input capability essential for noisy industrial or medical environments-without increasing supply or interface complexity.

Availability

ADS8865IDRCT is available at Aetrix Electronics and suitable for high-precision sensor interface, battery-powered data logging, portable medical instrumentation, and automated test equipment requiring stable component supply and long-term production continuity.

Supply support for ADS8865IDRCT 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 low-power design.

The ADS8865IDRCT belongs to TI's 16-bit SAR ADC family optimized for high-resolution, low-power, and true-differential signal acquisition in instrumentation, medical, and industrial applications.

FAQ

What is the maximum sampling rate supported by the ADS8865IDRCT?

The ADS8865IDRCT supports a maximum throughput rate of 400 kSPS with no latency output. This is confirmed in the Electrical Characteristics table and Timing Requirements section of the SBAS573A datasheet. At this rate, the device achieves 96 dB SNR and ±1.0 LSB INL across the full industrial temperature range. The ADS8865IDRCT maintains full 16-bit performance without pipeline delay, making it suitable for real-time control loops and high-fidelity waveform capture.

Does the ADS8865IDRCT require an external reference voltage?

Yes, the ADS8865IDRCT requires an external reference voltage applied to the REF pin, which must be in the range of 2.5 V to 5 V. The reference voltage directly defines the full-scale differential input range (–VREF to +VREF) and is independent of AVDD. A minimum 10 µF decoupling capacitor is required at the REF pin to maintain linearity and noise performance, as specified in the External Reference Input section of the datasheet.

Can the ADS8865IDRCT interface with a 1.8-V microcontroller?

Yes, the ADS8865IDRCT supports 1.65 V to 3.6 V DVDD, making it fully compatible with 1.8-V logic systems. Its digital I/O thresholds scale with DVDD (e.g., VIH = 0.7 × DVDD), and it drives outputs to 0.8 × DVDD minimum under 500-µA load. The device also features separate AVDD and DVDD supplies, allowing analog and digital domains to operate at different voltages-critical for noise isolation in mixed-signal designs.

What is the purpose of the CONVST pin on the ADS8865IDRCT?

The CONVST pin on the ADS8865IDRCT serves as the conversion start trigger and doubles as the chip select (CS) signal in 3-wire interface mode. A rising edge initiates sampling, and the device enters acquisition phase afterward. In 3-wire mode, CONVST controls DOUT 3-state behavior; in daisy-chain mode, it synchronizes conversions across multiple devices. Its minimum pulse width is 10 ns, and timing relationships to SCLK and DIN are defined in Tables 1–3 of the datasheet.

How does the ADS8865IDRCT handle common-mode voltage variations?

The ADS8865IDRCT supports a wide common-mode voltage (VCM) range from 0 V to VREF with ≥90 dB CMRR, enabled by an internal common-mode detection and rejection block. Unlike conventional differential SAR ADCs, it does not restrict VCM to mid-scale-allowing direct connection to sensors with arbitrary DC offsets. Table 4 in the datasheet confirms full-scale input range adapts dynamically to VCM, preserving 16-bit accuracy without external level-shifting circuitry.