Texas Instruments ADS7250IRTET

Overview

ADS7250IRTET from Texas Instruments is a dual, 12-bit, simultaneous-sampling analog-to-digital converter (ADC) with pseudo-differential inputs, 750-kSPS throughput, 73-dB SNR, and ±1-LSB INL. It operates over –40°C to 125°C and supports independent reference inputs per channel for motor control position feedback.

For engineers reviewing the ADS7250IRTET datasheet, ADS7250IRTET pinout, ADS7250IRTET application, or ADS7250IRTET equivalent, key selection criteria include simultaneous dual-channel sampling accuracy, WQFN-16 thermal performance, pseudo-differential input flexibility, and extended industrial temperature operation without external calibration.

Technical Context

The ADS7250IRTET implements two independent successive-approximation register (SAR) ADC cores sharing a common serial interface. Each channel features dedicated REFIN and REFGND pins, enabling isolated reference domains for noise-sensitive measurements.

It uses a simple 3-wire SPI-compatible interface (CS, SCLK, dual SDO outputs), supports AVDD = 5 V and DVDD = 3.3 V supplies, and achieves aperture jitter of 10 ps - critical for high-fidelity acquisition in protection relays and power quality analyzers.

Key Specifications

Pinout & Package

ADS7250IRTET is housed in a thermally enhanced 16-pin WQFN package (3 mm × 3 mm) with exposed thermal pad connected to GND. Pin functions are validated per TI SBAS580D Rev D.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7850IRTET and ADS8350IRTET, the ADS7250IRTET delivers optimal cost-performance balance for industrial motion control and relay protection where 12-bit resolution and 73-dB SNR meet functional safety and accuracy requirements without over-specifying.

Availability

ADS7250IRTET is available at Aetrix Electronics and suitable for motor control, protection relays, and power quality measurement systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ADS7250IRTET 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 ADSxx50 family-including ADS7250IRTET-was engineered for high-reliability, simultaneous dual-channel acquisition in harsh industrial environments, emphasizing thermal robustness, noise immunity, and pin-compatible scalability across 12-/14-/16-bit variants.

FAQ

What is the maximum clock frequency supported by the ADS7250IRTET?

The ADS7250IRTET supports a maximum SCLK frequency of 24 MHz, enabling its full 750-kSPS throughput rate. This timing is validated across the full –40°C to 125°C operating range and aligns with the tD_CKDO specification of 3–20 ns. The ADS7250IRTET maintains reliable serial communication at this rate without requiring external clock dividers or interface glue logic.

Does the ADS7250IRTET require external reference voltage components?

Yes, the ADS7250IRTET requires external reference voltage sources applied to REFIN-A and REFIN-B pins. It accepts 2.25 V to 2.5 V inputs, with recommended 10-µF ceramic decoupling capacitance per reference input. The device does not integrate an internal reference, allowing system designers to optimize reference stability, temperature drift, and noise performance independently per channel.

How is crosstalk managed between the two ADC channels in the ADS7250IRTET?

The ADS7250IRTET achieves –85 dB isolation between ADC_A and ADC_B at 15 kHz input frequency, verified per SBAS580D. This is enabled by physically separate analog front-end paths, independent reference domains (REFIN/REFGND per channel), and differential input architecture - all implemented within the monolithic die. No external shielding or layout separation beyond standard high-speed PCB practices is required.

Can the ADS7250IRTET operate with different supply voltages on AVDD and DVDD?

Yes, the ADS7250IRTET supports independent AVDD (4.5–5.5 V) and DVDD (1.65–5.5 V) supplies. This allows interfacing with 3.3-V or 1.8-V microcontrollers while maintaining 5-V analog headroom for maximum dynamic range. The digital I/O levels scale with DVDD, and the device guarantees proper logic thresholds (VIH/VIL) across the full DVDD range without level-shifting circuitry.

What thermal design considerations apply to the ADS7250IRTET in continuous 750-kSPS operation?

In continuous 750-kSPS operation, the ADS7250IRTET dissipates up to 45 mW. With R_θJB = 7.3°C/W, a 4-layer PCB with ≥2 cm² of 2-oz copper connected to the exposed thermal pad limits junction-to-board rise to ~0.33°C. To maintain TJ ≤125°C at 125°C ambient, ensure ≥1 cm² thermal pad area and at least four thermal vias to inner ground planes - validated in TI's RTE package layout guidelines.