Texas Instruments ADS7863IDBQ

Overview

ADS7863IDBQ 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 output. It operates from 2.7V to 5.5V supplies and supports motor control and multi-axis positioning systems.

For engineers reviewing the ADS7863IDBQ datasheet, ADS7863IDBQ pinout, ADS7863IDBQ application, or ADS7863IDBQ equivalent, key selection criteria include simultaneous sampling capability, 72dB CMRR at 100kHz, SSOP-24 package compatibility, and support for both fully differential and pseudo-differential input configurations in industrial real-time control.

Technical Context

The ADS7863IDBQ implements two independent SAR ADCs sharing a common clock and control interface, enabling true simultaneous acquisition across two channel pairs (CHA0/1 and CHB0/1). Each ADC features a 2:1 fully differential or 3:1 pseudo-differential multiplexer with C1/C0 register-controlled selection.

Its internal 2.5V reference includes a 10-bit DAC and low-noise unity-gain buffer, allowing REFOUT voltage adjustment in 2.44mV steps via serial interface. The device uses a 16-clock-cycle conversion sequence (12 for conversion + 1 for precharge + ≥2 for setup/hold), achieving 2MSPS maximum data rate at 32MHz CLOCK.

Key Specifications

Pinout & Package

ADS7863IDBQ is housed in a 24-pin SSOP (DBQ) package with 0.635mm pitch and 8.2mm × 3.9mm body size. Pin 1 is BGND; pins are arranged in two rows with analog inputs on left/right edges and digital interface on bottom edge.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7861IDBQ and ADS8361IPW, ADS7863IDBQ uniquely balances 2MSPS simultaneous sampling, programmable reference, and flexible input muxing-making it optimal for cost-sensitive, space-constrained industrial motor drives requiring adaptive calibration.

Availability

ADS7863IDBQ 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 (–40°C to +125°C).

Supply support for ADS7863IDBQ 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 broad industrial, automotive, and communications product portfolios.

The ADS7863IDBQ belongs to TI's high-speed precision ADC family designed specifically for real-time control applications demanding simultaneous sampling, robust noise immunity, and flexible system calibration.

FAQ

What is the maximum sampling rate of the ADS7863IDBQ?

The ADS7863IDBQ achieves a maximum sampling rate of 2MSPS per ADC with simultaneous acquisition. This requires a 32MHz external CLOCK signal and leverages a 16-clock-cycle conversion sequence (12 for conversion + 1 for precharge + ≥2 for setup/hold). At lower CLOCK frequencies, the data rate scales linearly-for example, 16MHz CLOCK yields 1MSPS. The ADS7863IDBQ maintains full 12-bit performance across its entire 1–32MHz CLOCK range.

Does the ADS7863IDBQ support pseudo-differential input mode?

Yes, the ADS7863IDBQ supports pseudo-differential input mode via its per-ADC 3:1 multiplexer configuration. By setting C1/C0 bits to 01 or 10 in the SDI register, CHx0– becomes the common-mode reference while CHx1– or CHx1+ serves as the active input. This enables three independent single-ended measurements per ADC using only one shared reference node-ideal for applications like multi-phase current sensing where all negative inputs tie to a common shunt voltage.

How is the internal 2.5V reference programmed on the ADS7863IDBQ?

The ADS7863IDBQ's internal 2.5V reference is programmed through a 10-bit DAC accessible via the SDI serial interface. Writing values 0x000 to 0x3FF to the DAC register adjusts REFOUT from 0.5V to 2.5V in 2.44mV increments. The DAC output is buffered by a low-noise unity-gain amplifier, allowing direct connection to REFIN for self-referenced operation or use as a system calibration voltage. Programming occurs during normal serial communication cycles without interrupting conversion.

What are the power supply requirements for the ADS7863IDBQ?

The ADS7863IDBQ requires two independent supplies: AVDD (2.7–5.5V) for analog circuitry and BVDD (2.7–5.5V) for digital I/O. AVDD powers the ADC cores, reference, and analog front-end; BVDD powers the serial interface and output drivers. AGND and BGND must be connected at a single point to prevent ground loops. At AVDD = 5V and BVDD = 3.3V, total power dissipation is 45.3mW-scalable down to 0.001mW in deep power-down mode.

Is the ADS7863IDBQ pin-compatible with other TI ADCs?

Yes, the ADS7863IDBQ is pin-compatible with the ADS7861IDBQ in the SSOP-24 (DBQ) package, sharing identical pin assignments for all analog inputs, power, ground, and serial interface signals. This enables drop-in upgrades from ADS7861IDBQ to ADS7863IDBQ to add programmable reference and pseudo-differential mux functionality without PCB redesign. It is not pin-compatible with the QFN-packaged ADS7863IRGE variant due to differing pinouts.