Texas Instruments ADS7251IRTET

Overview

ADS7251IRTET from Texas Instruments is a 12-bit, dual-channel, simultaneous-sampling analog-to-digital converter with independent internal 2.5-V references per channel, 2-MSPS throughput, 73-dB SNR, and fully differential inputs. It operates across –40°C to +125°C and targets high-precision motor control and power quality measurement systems requiring synchronized sampling of two analog signals.

For engineers reviewing the ADS7251IRTET datasheet, ADS7251IRTET pinout, ADS7251IRTET application, or ADS7251IRTET equivalent, this page delivers verified specifications, WQFN-16 package layout, real-world use cases in industrial automation, and validated alternative parts for design flexibility and supply continuity.

Technical Context

The ADS7251IRTET implements two independent successive-approximation register (SAR) ADCs with dedicated CDAC, comparator, and sample-and-hold circuits per channel-enabling true simultaneous acquisition without inter-channel skew. Each ADC uses its own internal reference (REFOUT_A/REFOUT_B), decoupled by 22-μF capacitors to respective REFGND pins.

It employs a serial interface with separate SDO-A and SDO-B outputs, CS-controlled frame synchronization, and supports digital supply voltages from 1.65 V to 3.6 V. Acquisition time is 75 ns, conversion time is tSU_CSCK + 12 × tCLK, and full-power bandwidth is 25 MHz-optimized for fast transient capture in closed-loop control.

Key Specifications

Pinout & Package

ADS7251IRTET is housed in a thermally enhanced WQFN-16 (3 mm × 3 mm) package with exposed thermal pad. Pin 1 is REFOUT-A; pin 16 is AINM-A. The thermal pad must be soldered to PCB ground for optimal thermal performance and noise immunity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7250IRTET, ADS7251IRTET adds essential dual-channel simultaneity and independent reference outputs-enabling true phase-coherent measurement. Against ADS7263IRTET, it offers lower cost and smaller footprint where only two synchronized channels are needed.

Availability

ADS7251IRTET is available at Aetrix Electronics and suitable for motor control, power quality monitoring, and protection relay designs requiring stable component supply, extended temperature operation, and synchronized dual-channel data acquisition.

Supply support for ADS7251IRTET 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, embedded processing, and high-reliability components for industrial, automotive, and communications markets.

The ADS7251IRTET belongs to TI's precision SAR ADC product line, engineered for high-speed, high-accuracy simultaneous sampling in harsh industrial environments-emphasizing timing integrity, reference stability, and thermal robustness.

FAQ

What is the maximum sampling rate of the ADS7251IRTET?

The ADS7251IRTET achieves a maximum sampling rate of 2 million samples per second (2 MSPS) per channel. This is supported by a 32-MHz SCLK and a conversion time of tSU_CSCK + 12 × tCLK. At this rate, the device maintains 73-dB SNR and ±1 LSB INL across the full –40°C to +125°C operating range-making ADS7251IRTET suitable for demanding real-time control loops.

Does the ADS7251IRTET require external reference components?

No, the ADS7251IRTET integrates two independent 2.5-V internal voltage references (REFOUT_A and REFOUT_B), each with ±10 ppm/°C drift and ±1 mV matching. External components are limited to mandatory 22-μF ceramic decoupling capacitors per reference output-no external reference IC, buffer, or trimming circuitry is needed, simplifying design and improving long-term stability of ADS7251IRTET systems.

How does the ADS7251IRTET achieve simultaneous sampling across two channels?

The ADS7251IRTET uses physically separate SAR ADC cores (ADC_A and ADC_B), each with its own sample-and-hold, CDAC, and comparator-triggered by the same CS falling edge. Timing characterization confirms <40-ps inter-channel aperture delay mismatch. This hardware-level simultaneity ensures phase-coherent acquisition critical for ADS7251IRTET applications like motor current/voltage vector control and impedance-based protection.

What package type and thermal characteristics does the ADS7251IRTET use?

The ADS7251IRTET is packaged in a 3-mm × 3-mm WQFN-16 with exposed thermal pad. Its junction-to-board thermal resistance (RθJB) is 7.3°C/W, and junction-to-ambient (RθJA) is 33.3°C/W. TI recommends soldering the thermal pad directly to a solid PCB ground plane to maintain junction temperature within limits during continuous 2-MSPS operation-ensuring reliable ADS7251IRTET performance in compact industrial modules.

Can the ADS7251IRTET operate with different analog and digital supply voltages?

Yes, ADS7251IRTET supports independent analog (AVDD = 4.75–5.25 V) and digital (DVDD = 1.65–3.6 V) supplies. This dual-supply architecture isolates sensitive analog circuitry from digital switching noise. DVDD compatibility with 1.8-V and 3.3-V logic families enables direct interfacing with modern microcontrollers and FPGAs-enhancing system-level flexibility without level-shifting for ADS7251IRTET integration.