Texas Instruments ADS7863ARGER

Overview

ADS7863ARGER from Texas Instruments is a dual, 12-bit, 2-MSPS simultaneous-sampling analog-to-digital converter with four fully-differential or six pseudo-differential input channels (CHA0±/CHA1±/CHB0±/CHB1±), integrated 2.5-V programmable reference output (10-bit DAC), and serial interface - designed for high-precision motor control and multi-axis positioning systems requiring tight channel-to-channel timing alignment.

For engineers reviewing the ADS7863ARGER datasheet, ADS7863ARGER pinout, ADS7863ARGER application, or ADS7863ARGER equivalent, key selection criteria include simultaneous sampling capability, 72 dB CMRR at 100 kHz, ±1 LSB INL over –40°C to +125°C, and support for flexible supply rails (AVDD/BVDD = 2.7 V to 5.5 V) in harsh industrial environments.

Technical Context

The ADS7863ARGER implements two independent successive-approximation register (SAR) ADCs sharing a common CLOCK input, enabling true simultaneous acquisition across both A and B channel pairs. Each ADC features a 2:1 fully-differential or 3:1 pseudo-differential input multiplexer controlled via C1/C0 bits in the SDI register.

Its internal 2.5-V reference drives a 10-bit string DAC, allowing REFOUT voltage adjustment in 2.44-mV steps (0.5 V to 2.515 V range), buffered by a low-noise unity-gain op-amp. The device maintains differential signal paths through the S/H amplifier to ADC core, delivering 71 dB SNR and –81 dB THD at 100 kHz input.

Key Specifications

Pinout & Package

ADS7863ARGER 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 space-constrained motor control modules.

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 ADS7863ARGER uniquely balances 12-bit precision, 2-MSPS simultaneous sampling, programmable reference, and –40°C to +125°C operation - making it optimal for cost-sensitive, thermally demanding motor control designs where timing integrity is non-negotiable.

Availability

ADS7863ARGER is available at Aetrix Electronics and suitable for motor control, multi-axis positioning systems, three-phase power control, and industrial PLC analog input modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ADS7863ARGER 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 IC design.

The ADS7863A product line was engineered specifically for high-fidelity, time-critical analog acquisition in motor drives and automation systems - emphasizing simultaneous sampling, robust noise immunity, and flexible power architecture.

FAQ

What is the maximum simultaneous sampling rate supported by the ADS7863ARGER?

The ADS7863ARGER achieves a maximum simultaneous sampling rate of 2 MSPS per ADC, enabled by its dual SAR architecture and 32-MHz CLOCK input. Conversion time is fixed at 406.25 ns (16 clock cycles at 32 MHz), with 62.5-ns acquisition time. This rate is maintained across the full –40°C to +125°C temperature range and 2.7–5.5-V supply range, as verified in the SBAS610 datasheet Table 3.

Does the ADS7863ARGER require an external reference, or can it operate using only its internal reference?

The ADS7863ARGER can operate using only its internal 2.5-V reference - the REFOUT pin delivers a buffered, programmable output (2.485–2.515 V) controlled by a 10-bit DAC. However, REFIN must be externally decoupled with ≥470 nF ceramic capacitance to AGND. An external reference may be applied to REFIN if higher initial accuracy or lower drift is required, but the internal reference suffices for most motor control applications.

How does the pseudo-differential input mode work on the ADS7863ARGER, and which pins are involved?

In pseudo-differential mode, each ADC uses CHx0– as a common-mode reference node while treating CHx0+, CHx1–, and CHx1+ as three independent single-ended inputs relative to that node. This is configured via C1/C0 bits in the SDI register (Table 2, SBAS610 p.13). For ADC A: CHA0– is the reference; CHA0+, CHA1–, CHA1+ are inputs. Same applies to CHB0–/CHB0+/CHB1–/CHB1+ for ADC B. No hardware reconfiguration is needed - only register writes.

What is the purpose of the M0 and M1 pins on the ADS7863ARGER, and how do they affect operation?

M0 and M1 are mode configuration pins that determine analog input channel selection (M0) and serial data output routing (M1). M0 selects between CHx0±/CHx1± pairs per ADC; M1 configures SDOA/SDOB output behavior - when low, only SDOA is active; when high, both SDOA and SDOB output concurrently. These pins are sampled at power-up or reset and remain static during operation, eliminating need for dynamic GPIO control in resource-constrained microcontrollers.

Can the ADS7863ARGER interface directly with a 3.3-V microcontroller SPI port without level shifting?

Yes - the ADS7863ARGER supports mixed-supply operation: AVDD can be 5 V for analog performance while BVDD is set to 3.3 V for digital I/O. With BVDD = 3.3 V, the digital inputs (CS, RD, SDI, CONVST, CLOCK) accept VIH ≥ 2.31 V and VIL ≤ 0.99 V, and outputs (SDOA, SDOB, BUSY) drive VOH ≥ 3.1 V and VOL ≤ 0.2 V - fully compatible with standard 3.3-V SPI peripherals without level shifters.