Texas Instruments ADS7863IDBQG4

Overview

ADS7863IDBQG4 from Texas Instruments is a dual, 12-bit, 2MSPS simultaneous-sampling analog-to-digital converter with four fully differential or six pseudo-differential inputs, 71dB SNR, –81dB THD, and integrated 2.5V reference with 10-bit programmable DAC. It operates from 2.7V to 5.5V supplies and supports industrial motor control and multi-axis positioning systems.

For engineers reviewing the ADS7863IDBQG4 datasheet, ADS7863IDBQG4 pinout, ADS7863IDBQG4 application, or ADS7863IDBQG4 equivalent, key selection criteria include simultaneous sampling capability, 72dB CMRR at 100kHz, flexible input multiplexing (2+2 or 3+3 channel modes), internal reference programmability, and SSOP-24 package compatibility with ADS7861/ADS8361.

Technical Context

The ADS7863IDBQG4 implements two independent SAR ADCs sharing a common clock and control interface, enabling true simultaneous sampling of two analog channels. Its input stage uses fully differential sample-and-hold amplifiers with 2pF sampling capacitors and internal 200Ω series resistors to manage charge injection and amplifier stability.

Conversion timing is governed by an external 1–32MHz clock; each full conversion requires 16 clock cycles (12 for conversion + 1 for precharge + ≥3 for acquisition/setup). The device supports two analog input configurations via C1/C0 bits: fully differential 2:1 (CHx0+/CHx0– or CHx1+/CHx1–) or pseudo-differential 3:1 (CHx0+, CHx1–, CHx1+ referenced to CHx0–).

Key Specifications

Pinout & Package

ADS7863IDBQG4 is packaged in SSOP-24 (DBQ) with exposed pad, optimized for thermal performance in high-density PCB layouts. Pin functions are validated per TI SBAS383E datasheet Rev. January 2011.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel simultaneous-sampling ADC applications.

Compared with ADS7863IDBQG4, ADS7861IDBQ offers lower system cost but requires external reference and sacrifices input flexibility, while ADS8361IPWR delivers superior DC accuracy at half the sampling rate-making ADS7863IDBQG4 optimal for bandwidth-critical, thermally constrained simultaneous-sampling applications.

Availability

ADS7863IDBQG4 is available at Aetrix Electronics and suitable for motor control, multi-axis positioning systems, and three-phase power control requiring stable component supply across extended temperature ranges.

Supply support for ADS7863IDBQG4 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 ADS7863IDBQG4 belongs to TI's high-speed precision ADC product line, engineered specifically for real-time control applications demanding simultaneous sampling, robust noise immunity, and extended temperature operation.

FAQ

What is the maximum sampling rate of the ADS7863IDBQG4?

The ADS7863IDBQG4 achieves a maximum sampling rate of 2MSPS per ADC channel using a 32MHz external clock. Each full conversion cycle requires 16 clock periods (12 for conversion, 1 for precharge, and ≥3 for acquisition and setup), resulting in a minimum conversion time of 406.25ns at 32MHz. This rate is sustained across the full –40°C to +125°C operating range.

Does the ADS7863IDBQG4 support pseudo-differential input configurations?

Yes, the ADS7863IDBQG4 supports pseudo-differential 3+3 channel mode via its configurable input multiplexers. By setting C1/C0 bits, each ADC can accept three single-ended inputs (CHx0+, CHx1–, CHx1+) referenced to a common-mode input (CHx0–), enabling efficient use of six analog signals with only four differential input pairs. This mode is explicitly documented in Tables 1 and 2 of the SBAS383E datasheet.

How does the programmable reference DAC in the ADS7863IDBQG4 function?

The ADS7863IDBQG4 integrates a 10-bit DAC that controls the REFOUT pin voltage in 2.44mV steps across a 2.5V nominal range (2.485V to 2.515V). The DAC value is loaded via the SDI serial interface, and the buffered output drives both internal ADC references and external circuitry. Programming below 0.5V is prohibited to maintain buffer functionality, as specified in the Applications Information section.

What are the power supply requirements for the ADS7863IDBQG4?

The ADS7863IDBQG4 requires two independent supplies: AVDD (2.7V–5.5V) for the analog core and AGND, and BVDD (2.7V–5.5V) for digital I/O buffers and BGND. AVDD and BVDD may be set to different voltages (e.g., 5V analog / 3.3V I/O) to optimize noise isolation. Ground separation between AGND and BGND must not exceed 0.3V per absolute maximum ratings.

Is the ADS7863IDBQG4 pin-compatible with other TI ADCs?

Yes, the ADS7863IDBQG4 is pin-compatible with the ADS7861IDBQ in the SSOP-24 (DBQ) package, sharing identical pinout, footprint, and basic serial interface timing. It also maintains mechanical compatibility with the ADS8361IPWR. However, ADS7863IDBQG4 adds functional enhancements-including programmable REFOUT, M0/M1 mode control, and pseudo-differential mode-that require updated firmware but no PCB redesign.