Texas Instruments ADS7863ADBQ

Overview

ADS7863ADBQ from Texas Instruments is a dual, 12-bit, 2-MSPS simultaneous-sampling analog-to-digital converter with four fully-differential or six pseudo-differential inputs, 71 dB SNR, –81 dB THD, and programmable 2.5-V internal reference - used in motor control and three-phase power monitoring systems requiring high common-mode rejection (72 dB at 100 kHz) and tight channel-to-channel timing alignment.

For engineers reviewing the ADS7863ADBQ datasheet, ADS7863ADBQ pinout, ADS7863ADBQ application, or ADS7863ADBQ equivalent, this page delivers verified specifications, SSOP-24 package mapping, real-world acquisition timing (62.5 ns), SAR architecture details, and validated alternative options for industrial signal acquisition designs.

Technical Context

The ADS7863ADBQ implements two independent successive-approximation register (SAR) ADCs sharing a single external CLOCK input, enabling true simultaneous sampling with aperture jitter of 50 ps and matched aperture delay ≤50 ps. Each ADC features a 2:1 fully-differential or 3:1 pseudo-differential input multiplexer controlled via serial interface bits C1/C0.

Its analog front-end maintains full differential signaling from input pins through the sample-and-hold stage to the SAR core, delivering 72 dB CMRR at 100 kHz. The integrated 10-bit DAC-driven 2.5-V reference (±10 ppm/°C drift) is programmable in 2.44-mV steps and buffered for direct REFIN drive without external components.

Key Specifications

Pinout & Package

ADS7863ADBQ is packaged in a 24-pin SSOP (DBQ) with 0.635-mm pitch, optimized for thermal performance (θJA = 80.9°C/W) and board-level ESD robustness (HBM ±4000 V). Pin functions are electrically isolated between analog (AGND/AVDD) and digital (BGND/BVDD) domains.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8361IPW and AD7357BRUZ, the ADS7863ADBQ uniquely combines simultaneous 2-MSPS sampling, programmable internal reference, pseudo-differential input flexibility, and industrial temperature rating in a space-efficient SSOP-24 package - making it optimal for cost-sensitive, noise-immune motor and power control systems.

Availability

ADS7863ADBQ is available at Aetrix Electronics and suitable for motor control, three-phase power monitoring, and multi-axis positioning systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ADS7863ADBQ 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 signal chain solutions.

The ADS7863A product line targets high-speed, high-accuracy industrial sensing applications - specifically engineered for simultaneous sampling, noise immunity, and seamless integration into motor drives and energy infrastructure systems.

FAQ

What is the maximum achievable sampling rate for each ADC in the ADS7863ADBQ?

The ADS7863ADBQ supports up to 2 MSPS per ADC with a 32-MHz external CLOCK input. This rate is achieved using 16 clock cycles per conversion (12 for SAR, 1 for pre-charge, ≥2 for acquisition), resulting in a minimum conversion time of 406.25 ns. At lower clock frequencies, the data rate scales linearly - e.g., 16 MHz yields 1 MSPS. The ADS7863ADBQ maintains full 12-bit performance across the entire 1–2000 kSPS range.

How does the pseudo-differential input mode work on the ADS7863ADBQ?

The ADS7863ADBQ's pseudo-differential mode uses CHx0– as a shared common-mode reference for three positive inputs (CHx0+, CHx1–, CHx1+), configured via C1/C0 bits in the SDI register. This allows three single-ended-like signals to be acquired relative to one stable node - ideal for current shunt measurements where the negative side is tied to a known potential. The ADS7863ADBQ maintains full 12-bit linearity and 72 dB CMRR in this mode, unlike conventional single-ended ADCs.

Can the ADS7863ADBQ operate without an external reference component?

Yes - the ADS7863ADBQ integrates a 2.5-V internal reference with a 10-bit DAC and low-noise buffer, enabling full operation with only a 470-nF capacitor on REFIN. REFOUT provides a programmable output (2.485–2.515 V) adjustable in 2.44-mV steps via serial interface. External references are optional: REFIN accepts 0.5–2.525 V inputs, but the ADS7863ADBQ delivers specified 12-bit performance using its internal source alone.

What is the purpose of the M0 and M1 pins on the ADS7863ADBQ?

M0 and M1 are hardware mode-select pins that configure the ADS7863ADBQ's input multiplexer mapping (via C1/C0 bits) and serial output format (SDOA/SDOB activation). M1 high enables both SDO outputs; M0/M1 combinations select among four differential or six pseudo-differential input pairings per ADC. These pins eliminate the need for SPI writes to set basic operating modes - simplifying initialization and improving boot-time reliability in safety-critical systems using the ADS7863ADBQ.

Does the ADS7863ADBQ support true simultaneous sampling across all channels?

Yes - the ADS7863ADBQ performs true simultaneous sampling: both ADCs begin their acquisition phase at the exact same CONVST rising edge and convert in parallel using the same CLOCK. Aperture delay match is guaranteed ≤50 ps, and timing skew between channels is minimized by shared clock distribution and matched internal paths. This enables coherent capture of fast transient events across motor phases or power lines - a requirement unmet by multiplexed or interleaved dual-ADC architectures.