Texas Instruments ADS7854IRTER

Overview

ADS7854IRTER from Texas Instruments is a dual, simultaneous-sampling, 14-bit analog-to-digital converter (ADC) with fully differential inputs, 1 MSPS throughput, ±1.5 LSB max INL, and 88 dB typical SNR. It operates from 5-V AVDD and 3.3-V DVDD supplies and supports internal 2.5-V reference or external reference input - used in motor position feedback loops requiring precise, synchronized channel acquisition.

For engineers reviewing the ADS7854IRTER datasheet, ADS7854IRTER pinout, ADS7854IRTER application, or ADS7854IRTER equivalent, key selection considerations include simultaneous dual-channel sampling integrity, ADC-to-ADC isolation (–90 dB), 16-/32-clock serial interface flexibility, and extended industrial temperature operation (–40°C to 125°C).

Technical Context

The ADS7854IRTER implements two independent SAR ADC cores sharing a common clock domain to guarantee true simultaneous sampling across AINP_A/AINM_A and AINP_B/AINM_B inputs. Its dual programmable reference buffers (REFIO_A/REFIO_B) support system-level gain calibration without external components.

It features a flexible SPI-compatible serial interface with selectable 16- or 32-clock readout modes, configurable CS timing, and independent SDO_A/SDO_B outputs for time-aligned data streaming - enabling deterministic latency control in closed-loop control systems.

Key Specifications

Pinout & Package

ADS7854IRTER is housed in a 3-mm × 3-mm WQFN-16 package with exposed thermal pad. Pin functions are validated per TI SBAS556B Rev B datasheet (August 2014), Table 6.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8354IRTER, ADS7854IRTER trades 2 bits of resolution for 43% higher throughput and identical packaging - making it optimal for bandwidth-constrained FOC systems. Versus ADS7254IRTER, it adds 2 bits of resolution and 16 dB SNR at minimal power penalty - justifying use in mid-tier protection relays.

Availability

ADS7854IRTER is available at Aetrix Electronics and suitable for motor control, three-phase power management, and protection relay applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for ADS7854IRTER 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 ADSxx54 family - including ADS7854IRTER - was engineered for high-reliability, simultaneous-sampling applications in motor drives, energy infrastructure, and automated test equipment where channel synchronization and DC/AC accuracy are non-negotiable.

FAQ

What is the maximum sampling rate supported by the ADS7854IRTER?

The ADS7854IRTER supports 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) when using internal 2.5-V reference and standard 5-V AVDD/3.3-V DVDD supplies. The device achieves this with deterministic conversion time of 1 µs, verified in TI SBAS556B Section 7.10.

Does the ADS7854IRTER require an external reference voltage?

No, the ADS7854IRTER includes an integrated 2.5-V reference with ±1 mV matching between channels and ±10 ppm/°C drift - sufficient for most industrial applications. External reference is optional and supported via REFIO_A/REFIO_B pins, but not required. Internal reference activation is default at power-up, and disabling it reduces analog supply current by ~1 mA.

How does the ADS7854IRTER ensure simultaneous sampling between its two channels?

The ADS7854IRTER guarantees simultaneous sampling through matched aperture delay (<40 ps inter-channel skew) and shared sampling clock architecture. Both ADC cores sample their respective differential inputs (AINP_A/AINM_A and AINP_B/AINM_B) on the same edge of the internal sampling clock - eliminating phase-induced errors in vector calculations. This is confirmed in SBAS556B Section 7.8 (tA match parameter).

What package type is used for the ADS7854IRTER, and is thermal pad connection required?

The ADS7854IRTER uses the RTER (WQFN-16) package: 3 mm × 3 mm body with 0.5-mm pitch and exposed thermal pad. TI explicitly recommends connecting the thermal pad to PCB ground plane using ≥6 thermal vias - this reduces junction-to-board thermal resistance to 7.3°C/W and prevents thermal shutdown during sustained 1-MSPS operation at 125°C ambient.

Can the ADS7854IRTER interface directly with an FPGA using standard SPI protocol?

Yes, the ADS7854IRTER supports standard SPI-compatible timing with independent SDO_A/SDO_B outputs, configurable CS deassertion, and 16-/32-clock framing. It operates with DVDD from 1.65 V to 5.5 V, allowing direct interfacing to 1.8-V, 3.3-V, or 5-V FPGA I/O banks. Setup/hold times (e.g., tSU_CKDI = 5 ns) are compatible with modern FPGA IO delays, and no level-shifting is needed when DVDD matches the FPGA's I/O voltage.