Texas Instruments ADS7863ARGET

Overview

ADS7863ARGET 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 output - designed for high-precision motor control and three-phase power monitoring.

For engineers reviewing the ADS7863ARGET datasheet, ADS7863ARGET pinout, ADS7863ARGET application, or ADS7863ARGET equivalent, this page delivers verified technical context, exact pin functions, real-world use cases in industrial motion systems, and validated alternative options for signal acquisition at 2 MSPS with simultaneous sampling.

Technical Context

The ADS7863ARGET implements two independent SAR ADCs sharing a common 32-MHz external clock, each with a 2:1 fully-differential or 3:1 pseudo-differential input multiplexer (C1/C0-controlled), enabling simultaneous sampling of up to six channels across two ADC pairs. Its architecture maintains full differential signaling through the S/H stage to achieve 72 dB CMRR at 100 kHz.

It integrates a 10-bit DAC-driven, buffered 2.5-V reference (REFOUT) adjustable in 2.44-mV steps, with ±10 ppm/°C drift and 0.5–2.525 V programmable range. Power management includes NAP and deep power-down modes, reducing analog supply current to 1.4 mA (5 V) or 1 µA respectively.

Key Specifications

Pinout & Package

ADS7863ARGET is packaged in a 4-mm × 4-mm QFN-24 (RGE) with exposed thermal pad, optimized for thermal performance (θJCbot = 4.1°C/W) in high-density motor control PCBs.

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 ADS7863ARGET uniquely balances 2-MSPS simultaneous sampling, on-chip programmable reference, and hardware mode control - making it optimal for cost-sensitive, space-constrained motor drives requiring both speed and configurability without external support components.

Availability

ADS7863ARGET is available at Aetrix Electronics and suitable for motor control, three-phase power monitoring, multi-axis positioning systems, and industrial servo amplifiers requiring stable component supply across extended temperature ranges.

Supply support for ADS7863ARGET 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-reliability industrial motion control and energy conversion systems, delivering simultaneous sampling, robust noise immunity, and integrated reference functionality in compact QFN packages.

FAQ

What is the maximum achievable sampling rate for simultaneous dual-channel operation in ADS7863ARGET?

The ADS7863ARGET achieves a guaranteed 2-MSPS simultaneous sampling rate across both ADCs when driven by a 32-MHz external CLOCK. This rate includes full 12-bit conversion, acquisition (62.5 ns), and pre-charge cycles. At lower clock frequencies (e.g., 16 MHz), the data rate scales linearly to 1 MSPS while maintaining simultaneous capture integrity. The ADS7863ARGET datasheet specifies tCONV = 406.25 ns and tACQ = 62.5 ns as hard timing limits under recommended operating conditions.

Does ADS7863ARGET support pseudo-differential input configuration, and how is it enabled?

Yes, the ADS7863ARGET supports pseudo-differential 3+3 input mode per ADC pair, using CHx0– as a shared common-mode reference. This is enabled by writing C1/C0 bits in the SDI register: C1=0/C0=1 selects CHx1– vs CHx0–, and C1=1/C0=0 selects CHx1+ vs CHx0–. Hardware mode pins M0/M1 do not affect multiplexer configuration - only serial register writes determine input routing. The ADS7863ARGET functional block diagram and Table 2 in the datasheet confirm this behavior.

What is the accuracy and adjustability range of the internal reference output (REFOUT) on ADS7863ARGET?

The ADS7863ARGET REFOUT delivers a programmable 2.5-V output via an integrated 10-bit DAC, adjustable in 2.44-mV steps from 0.5 V to 2.525 V. At TA = +25°C, REFOUT = 2.500 V ±1.5 mV (2.495–2.505 V); over –40°C to +125°C, it drifts ±10 ppm/°C, yielding ±2.5 mV total variation. The DAC's INL is ±0.5 LSB and DNL ±1 LSB, ensuring monotonic adjustment across the full range. These values are specified in the Electrical Characteristics table of the ADS7863ARGET datasheet.

How does the ADS7863ARGET handle ground separation between analog and digital domains?

The ADS7863ARGET mandates strict separation: AGND (Pin 4) and BGND (Pin 17) must be connected to separate ground planes, with |AGND – BGND| ≤ 0.3 V per Absolute Maximum Ratings. AVDD powers analog circuitry including S/H and ADC core; BVDD powers digital I/O buffers and serial interface. Decoupling requires 1-μF ceramic capacitors from AVDD to AGND and BVDD to BGND. This split-ground architecture minimizes digital switching noise coupling into sensitive analog sampling paths - a requirement explicitly enforced in the ADS7863ARGET layout guidelines.

Can ADS7863ARGET operate with different supply voltages on AVDD and BVDD, and what are the valid ranges?

Yes, ADS7863ARGET supports independent supply rails: AVDD may be set from 2.7 V to 5.5 V for analog performance optimization, while BVDD can be 2.7 V to 3.6 V (for low-voltage logic) or 4.5 V to 5.5 V (for 5-V TTL compatibility). The device remains fully functional with AVDD = 3.3 V and BVDD = 5.0 V, for example. Electrical characteristics such as VOH/VOL and timing parameters (t9, tCKH) are separately characterized for both BVDD ranges - confirmed in the Recommended Operating Conditions and Timing Requirements tables of the ADS7863ARGET datasheet.