Texas Instruments ADS7863IDBQR

Overview

ADS7863IDBQR 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, 72dB CMRR at 100kHz, and supports flexible supply ranges (AVDD/BVDD = 2.7V–5.5V) for motor control and multi-axis positioning systems.

For engineers reviewing the ADS7863IDBQR datasheet, ADS7863IDBQR pinout, ADS7863IDBQR application, or ADS7863IDBQR equivalent, this page provides verified technical context, real-world timing and accuracy specs, SSOP-24 package details, functional alternatives, and supply-chain support tailored for high-reliability industrial embedded designs.

Technical Context

The ADS7863IDBQR integrates two independent SAR ADCs sharing a common clock and control logic, enabling true simultaneous sampling across two input pairs. Each ADC employs a fully differential sample-and-hold front-end with 2:1 or 3:1 programmable multiplexing, maintaining signal integrity through differential paths to the conversion core.

Its internal 2.5V reference includes a 10-bit DAC for programmable REFOUT adjustment in 2.44mV steps, buffered by a unity-gain op-amp. The serial interface supports ADS7861 compatibility while adding SDI-based configuration, with SDOA/SDOB outputs synchronized to CLOCK falling edges and controlled by M0/M1 mode pins.

Key Specifications

Pinout & Package

ADS7863IDBQR is housed in a 24-pin SSOP (DBQ) package with 0.635mm pitch and exposed thermal pad. Pin assignments are validated per TI SBAS383E Rev E.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7861IDBQ, ADS7863IDBQR adds reference programmability and input flexibility at identical speed; compared with ADS8361IPW, it trades resolution for doubled throughput and active reference control-making ADS7863IDBQR optimal for real-time closed-loop industrial control.

Availability

ADS7863IDBQR 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 and industrial voltage ranges.

Supply support for ADS7863IDBQR 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 ADS7863 belongs to TI's high-performance simultaneous-sampling ADC product line, engineered specifically for demanding real-time control applications including servo drives, energy meters, and automated test equipment.

FAQ

What is the maximum achievable sampling rate for ADS7863IDBQR in simultaneous mode?

The ADS7863IDBQR achieves a maximum data rate of 2MSPS per ADC when operating with fCLK = 32MHz. This rate accounts for 12 clock cycles for conversion, 1 for pre-charging, and margin for setup/hold timing. At lower clock frequencies, the rate scales linearly-for example, 1MHz clock yields ~62.5kSPS. The ADS7863IDBQR maintains full 12-bit performance across this range.

Does ADS7863IDBQR support pseudo-differential input configuration, and how is it enabled?

Yes, ADS7863IDBQR supports pseudo-differential mode via its 3:1 input multiplexer per ADC. Configuration is controlled by C1/C0 bits in the SDI register: setting C1=0/C0=1 selects CHx1– as ADC+ and CHx0– as ADC–, while C1=1/C0=0 selects CHx1+ and CHx0–. This allows three single-ended inputs referenced to a common CHx0– node-confirmed in Table 2 of SBAS383E.

How is the internal 2.5V reference adjusted on ADS7863IDBQR?

The ADS7863IDBQR uses a 10-bit DAC to program REFOUT from 0.5V to 2.5V in 2.44mV steps. Adjustment is performed via the SDI serial interface by writing to the DAC register. The buffered output (REFOUT) remains stable within ±10ppm/°C drift and supports ±2mA load current-enabling calibration of sensor gain or offset without external components.

What are the critical timing constraints for CONVST relative to CLOCK on ADS7863IDBQR?

CONVST must avoid the "gray zone": 10ns before to 5ns after any CLOCK rising edge. Issuing CONVST in this window causes indeterminate conversion start timing. Valid windows are Region A (≥10ns before CLOCK edge), Region B (5ns after to 10ns before next edge), or Region C (≥5ns after next edge). Violation risks missed conversions or inconsistent BUSY assertion-verified in Figure 2 of SBAS383E.

Can ADS7863IDBQR operate with separate analog and digital supply voltages, and what are the limits?

Yes, ADS7863IDBQR supports independent AVDD (2.7V–5.5V) and BVDD (2.7V–5.5V) supplies, decoupled separately to AGND and BGND. Absolute maximum ratings allow AVDD–BVDD ≤ 1.5×AVDD and |AGND–BGND| ≤ 0.3V. Operating outside these bounds risks parametric shift or permanent damage-per Absolute Maximum Ratings table in SBAS383E.