Texas Instruments ADS7853IRTER

Overview

ADS7853IRTER from Texas Instruments is a dual, simultaneous-sampling, 14-bit analog-to-digital converter (ADC) with pseudo-differential and single-ended input support, 1 MSPS throughput, ±2-LSB max INL, and 82-dB SNR. It operates over –40°C to 125°C and is used in motor position feedback systems requiring synchronized channel acquisition.

For engineers reviewing the ADS7853IRTER datasheet, ADS7853IRTER pinout, ADS7853IRTER application, or ADS7853IRTER equivalent, key selection considerations include simultaneous sampling capability, dual independent reference inputs (REFIO_A/REFIO_B), internal 2.5-V reference, and WQFN-16 package compatibility with high-density industrial control PCB layouts.

Technical Context

The ADS7853IRTER integrates two fully independent ADC cores sharing a common AVDD and DVDD supply but featuring separate reference inputs (REFIO_A/REFIO_B) and ground references (REFGND_A/REFGND_B), enabling isolated gain calibration per channel. Its serial interface supports both 16- and 32-clock modes for flexible timing and data readout.

It delivers simultaneous sampling via matched aperture delay (tA match ≤ 40 ps) and supports pseudo-differential inputs with ±VREF/2 full-scale range or single-ended inputs with 0–VREF range. Internal 2.5-V reference output has ±1-mV matching between channels and ±10 ppm/°C drift.

Key Specifications

Pinout & Package

The ADS7853IRTER is housed in a 3-mm × 3-mm WQFN-16 package with exposed thermal pad, optimized for thermal performance in compact industrial modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7853IPWR, the ADS7853IRTER offers superior thermal performance in space-constrained designs; compared with ADS8353IRTER, it trades 2 bits of resolution for 67% higher sample rate-making it optimal for real-time closed-loop control where latency outweighs quantization noise.

Availability

ADS7853IRTER is available at Aetrix Electronics and suitable for motor control, optical networking, three-phase power monitoring, and protection relay applications requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ADS7853IRTER 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 connectivity technologies for industrial, automotive, and communications markets.

The ADSxx53 family-including ADS7853IRTER-is designed for high-precision, simultaneous-sampling data acquisition in real-time control systems where channel synchronization, DC accuracy, and ruggedized operation are critical.

FAQ

What is the maximum sampling rate of the ADS7853IRTER?

The ADS7853IRTER achieves a maximum throughput of 1 MSPS in both 16-clock and 32-clock serial interface modes. This rate is maintained across the full operating temperature range (–40°C to +125°C) with AVDD = 5 V and DVDD = 3.3 V, enabling real-time capture of fast control loop signals in motor drives and power converters. The ADS7853IRTER sustains this rate without performance degradation in simultaneous sampling mode.

Does the ADS7853IRTER support external reference voltage?

Yes, the ADS7853IRTER supports external reference voltages applied to REFIO_A and REFIO_B pins, with valid range 2.4 V to AVDD (for internal reference disabled) or 2.4 V to AVDD/2 (for 2×VREF mode). When using external references, the internal 2.5-V reference is disabled, and each channel can accept independent reference sources-enabling flexible system-level calibration schemes. The ADS7853IRTER maintains specified INL and SNR performance under external reference conditions.

What is the purpose of separate REFGND_A and REFGND_B pins on the ADS7853IRTER?

REFGND_A and REFGND_B provide dedicated, low-impedance return paths for the reference circuitry of Channel A and Channel B respectively. This physical separation minimizes reference crosstalk and improves channel-to-channel isolation-measured at –100 dB for ADC-to-ADC isolation at 15 kHz. In high-accuracy applications like dual-resolver interfaces, this design prevents shared ground noise from degrading gain matching or introducing inter-channel phase errors. The ADS7853IRTER leverages these pins to achieve its specified ±2-LSB INL match across temperature.

Can the ADS7853IRTER operate with different supply voltages on AVDD and DVDD?

Yes, the ADS7853IRTER supports independent supply rails: AVDD must be 4.5–5.5 V (for internal reference) or 5.0–5.5 V (for external reference), while DVDD operates from 1.65 V to 5.5 V. This flexibility allows interfacing with 1.8-V or 3.3-V microcontrollers while maintaining full analog performance. The ADS7853IRTER specifies digital input thresholds relative to DVDD and analog performance relative to AVDD-ensuring robust operation even with mixed-voltage system architectures.

How does the ADS7853IRTER handle simultaneous sampling in practice?

The ADS7853IRTER implements true simultaneous sampling using two independent ADC cores triggered by a shared sampling clock edge, with aperture delay matching ≤40 ps. During conversion, both channels acquire their analog inputs at precisely the same instant-verified by the device's ISOXT specification of –100 dB. This behavior is hardware-enforced and does not rely on software synchronization. The ADS7853IRTER outputs results via SDO_A and SDO_B, allowing either time-multiplexed or parallel readout depending on host controller capability.