Texas Instruments ADS7851IRTER

Overview

ADS7851IRTER from Texas Instruments is a 14-bit, 1.5-MSPS dual simultaneous-sampling analog-to-digital converter with two independent internal 2.5-V references, fully differential inputs, and WQFN-16 (3 mm × 3 mm) packaging. It delivers 83.5 dB SNR and ±2 LSB INL over –40°C to +125°C, enabling precise synchronized acquisition in motor control and power quality measurement systems.

For engineers reviewing the ADS7851IRTER datasheet, ADS7851IRTER pinout, ADS7851IRTER application, or ADS7851IRTER equivalent, this page provides verified specifications, validated pin functions, confirmed industrial-temperature operation, and real-world implementation context for dual-channel high-fidelity data acquisition.

Technical Context

The ADS7851IRTER implements two independent SAR ADC cores with dedicated CDACs and sampling switches, each driven by its own internal reference (REFOUT-A/REFOUT-B). Its simultaneous sampling architecture ensures zero inter-channel skew (<40 ps aperture mismatch), critical for phase-sensitive applications like three-phase power analysis.

It uses a serial SPI-compatible interface with separate SDO-A/SDO-B outputs, CS-controlled frame synchronization, and supports digital supply voltages from 1.65 V to 3.6 V. The analog input full-scale range is precisely 2 × VREF (±2.5 V differential), with common-mode voltage fixed at VREF ±0.1 V.

Key Specifications

Pinout & Package

ADS7851IRTER is housed in a thermally enhanced WQFN-16 package (3 mm × 3 mm, 0.5-mm pitch) with exposed thermal pad connected to PCB ground per TI recommendation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7251IRTER, the ADS7851IRTER trades 0.5 MSPS speed for +10 dB SNR and +2-bit resolution-critical for harmonic analysis-while AD7380BCPZ-RL7 adds 2 bits and 2.5× speed but removes integrated references, increasing BOM and layout sensitivity.

Availability

ADS7851IRTER is available at Aetrix Electronics and suitable for motor control, power quality measurement, and protection relay applications requiring stable component supply, extended temperature operation, and guaranteed long-term availability.

Supply support for ADS7851IRTER 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 ADS7851IRTER belongs to TI's ADS7x51 family of dual simultaneous-sampling ADCs, engineered specifically for high-fidelity, phase-coherent acquisition in demanding industrial motor control and energy monitoring systems.

FAQ

What is the maximum sampling rate supported by the ADS7851IRTER?

The ADS7851IRTER supports a maximum sampling rate of 1.5 million samples per second (1.5 MSPS), as specified in its electrical characteristics table under fDATA. This rate is achievable with a 27-MHz SCLK and proper timing margins, and it maintains full 14-bit performance including 83.5 dB SNR and ±2 LSB INL across the full industrial temperature range. The ADS7851IRTER achieves this while consuming only 50–60 mW in active mode.

Does the ADS7851IRTER require external reference components?

No, the ADS7851IRTER does not require external reference components. It integrates two independent, trimmed 2.5-V internal voltage references (REFOUT-A and REFOUT-B), each with ±5 mV initial accuracy and ±10 ppm/°C drift. Each reference must be decoupled with a 22-μF capacitor to its dedicated REFGND pin, but no external reference IC or resistor network is needed-reducing BOM count and layout complexity for the ADS7851IRTER.

How are the two ADC channels synchronized in the ADS7851IRTER?

The ADS7851IRTER guarantees true simultaneous sampling via a shared aperture clock driving both SAR cores. Its datasheet specifies an aperture delay mismatch of ≤40 ps between ADC_A and ADC_B, ensuring phase coherence for time-critical measurements. Conversion is initiated by the CS signal, and both channels complete acquisition and hold within one clock cycle-enabling accurate differential and vector calculations without software interpolation or hardware calibration for the ADS7851IRTER.

What digital interface protocol does the ADS7851IRTER use?

The ADS7851IRTER uses a standard 4-wire SPI-compatible serial interface with separate data outputs: CS (active-low chip select), SCLK (serial clock up to 27 MHz), SDO-A (ADC_A data), and SDO-B (ADC_B data). It does not require a shared MISO line, eliminating contention. Data is MSB-first, 14-bit, and read on SCLK falling edges. No configuration registers or write commands are needed-the ADS7851IRTER operates in default mode immediately after power-up.

Is the ADS7851IRTER pin-compatible with other devices in its family?

Yes, the ADS7851IRTER is pin-compatible with the ADS7251IRTER (12-bit, 2-MSPS variant) in the same WQFN-16 package. Both share identical pin assignments, electrical interface behavior, and timing requirements-allowing drop-in replacement in existing layouts when resolution or speed requirements change. This compatibility extends to PCB footprint, decoupling, and reference circuitry, simplifying design reuse for the ADS7851IRTER.