Texas Instruments ADS7863IRGET

Overview

ADS7863IRGET from Texas Instruments is a dual, 12-bit, 2MSPS simultaneous-sampling analog-to-digital converter with four fully differential or six pseudo-differential inputs, internal 2.5V reference, serial interface, and operation over –40°C to +125°C. It delivers 71dB SNR, –81dB THD, and 72dB CMRR at 100kHz for high-precision motor control and three-phase power monitoring.

For engineers reviewing the ADS7863IRGET datasheet, ADS7863IRGET pinout, ADS7863IRGET application, or ADS7863IRGET equivalent, this page provides verified specifications, QFN-24 package layout, real-world use scenarios in industrial motion systems, and validated alternative parts for design continuity and supply resilience.

Technical Context

The ADS7863IRGET integrates two independent SAR ADCs sharing a common clock and serial interface, enabling true simultaneous sampling of two analog channels per conversion cycle. Its input multiplexer supports both fully differential (2:1) and pseudo-differential (3:1) configurations via C1/C0 bits, with each channel pair maintaining full differential signal path integrity through the S/H and CDAC stages.

Conversion timing is tightly controlled: acquisition time is fixed at 62.5ns (at 32MHz clock), conversion completes in 406.25ns, and BUSY asserts for exactly one clock cycle plus setup/hold margin. The internal 10-bit DAC adjusts REFOUT in 2.44mV steps, buffered by a unity-gain op amp capable of ±2mA output current and 0.5ms settling time.

Key Specifications

Pinout & Package

ADS7863IRGET is housed in a thermally enhanced 4×4mm QFN-24 package (RGE) with exposed thermal pad, rated for 45.6°C/W junction-to-air thermal resistance and 540mW max power dissipation at +125°C ambient.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel, high-speed ADC applications.

Compared with ADS8361IPW and AD7322BRUZ, the ADS7863IRGET uniquely combines simultaneous 2MSPS sampling, programmable reference output, and pseudo-differential input flexibility-making it optimal for space-constrained, noise-immune industrial motion control designs where reference tuning and channel count efficiency are critical.

Availability

ADS7863IRGET is available at Aetrix Electronics and suitable for motor control, three-phase power monitoring, and industrial PLC analog input modules requiring stable component supply across extended temperature and long production lifecycles.

Supply support for ADS7863IRGET 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.

The ADS7863 belongs to TI's high-speed precision ADC product line, engineered specifically for real-time control systems demanding simultaneous sampling, robust noise immunity, and extended temperature operation in harsh environments.

FAQ

What is the maximum clock frequency supported by the ADS7863IRGET?

The ADS7863IRGET supports an external CLOCK input from 1MHz to 32MHz. At 32MHz, it achieves its full 2MSPS sampling rate with 406.25ns conversion time and 62.5ns acquisition time. Operating above 32MHz violates timing specifications and may cause data corruption or increased INL/DNL errors in the ADS7863IRGET.

Does the ADS7863IRGET require an external reference voltage?

No-the ADS7863IRGET includes a built-in 2.5V reference with ±10ppm/°C drift and a programmable 10-bit DAC that adjusts REFOUT in 2.44mV steps. An external reference can be applied via REFIN (0.5–2.525V), but it is optional. The ADS7863IRGET operates fully functional with internal reference enabled, eliminating need for external reference ICs in most applications.

How does the pseudo-differential input mode work on the ADS7863IRGET?

The ADS7863IRGET's pseudo-differential mode uses CHx0– as a common-mode reference for three inputs (CHx0+, CHx1–, CHx1+), selected via C1/C0 bits in the SDI register. This allows single-ended sensor signals (e.g., thermocouples, RTDs) to share one negative input, reducing external buffering. The ADS7863IRGET maintains 72dB CMRR even in this mode, preserving noise immunity.

What power-down modes are available on the ADS7863IRGET?

The ADS7863IRGET offers Auto-NAP (reducing AIDD to 1.4mA at 5V) and deep power-down (AIDD ≤1µA) modes, activated via SDI register commands. These modes retain register settings and reference state, allowing fast wake-up (<1µs) without recalibration. In deep power-down, the ADS7863IRGET draws negligible current while preserving configuration for rapid resumption of sampling.

Is the ADS7863IRGET pin-compatible with other devices in its family?

Yes-the ADS7863IRGET is pin-compatible with the ADS7861 (SSOP-24) and ADS8361 (QFN-24), sharing identical pin functions and layout footprints. This allows drop-in replacement in existing designs. However, the ADS7863IRGET adds features not present in ADS7861-including programmable REFOUT, pseudo-differential MUX, and flexible supply ranges-requiring minor firmware updates for full utilization of the ADS7863IRGET.