Texas Instruments ADS8350IRTER

Overview

ADS8350IRTER from Texas Instruments is a dual, 16-bit, simultaneous-sampling analog-to-digital converter (ADC) with pseudo-differential inputs, 750 kSPS throughput, ±2.5 LSB max INL, 85-dB SNR, and WQFN-16 (3 mm × 3 mm) package - used in motor control position measurement with SinCos encoders.

For engineers reviewing the ADS8350IRTER datasheet, ADS8350IRTER pinout, ADS8350IRTER application, or ADS8350IRTER equivalent, this page delivers verified electrical specs, thermal performance at –40°C to 125°C, dual-channel timing matching (40 ps), and real-world implementation guidance for industrial automation and power quality systems.

Technical Context

The ADS8350IRTER implements successive approximation register (SAR) architecture with independent sample-and-hold for each of two ADC channels, enabling true simultaneous sampling. Its pseudo-differential input structure accepts AINP_x/AINM_x pairs referenced to dedicated REFGND_x pins, supporting flexible external reference configurations (REFIN-A/REFIN-B).

It uses a simple 4-wire SPI-compatible serial interface (SCLK, CS, SDO-A, SDO-B) operating up to 24 MHz, with deterministic conversion time of 590 ns and acquisition time of 120 ns. All timing parameters are fully specified across the extended industrial temperature range.

Key Specifications

Pinout & Package

ADS8350IRTER is housed in a thermally enhanced 16-pin WQFN package (3 mm × 3 mm, 0.5-mm pitch) with exposed thermal pad. The package supports high-density PCB layouts and efficient heat dissipation under continuous 40–45 mW operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7850IRTER and ADS8363IPWR, the ADS8350IRTER uniquely combines 16-bit precision, simultaneous sampling with matched apertures, and dual isolated reference grounds - making it the only option for high-fidelity, noise-immune dual-channel acquisition in safety-critical industrial systems.

Availability

ADS8350IRTER is available at Aetrix Electronics and suitable for motor control, protection relays, and power quality measurement requiring stable component supply across extended temperature and long product lifecycles.

Supply support for ADS8350IRTER 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.

The ADSxx50 family was designed specifically for high-accuracy, dual-channel simultaneous sampling in harsh industrial environments - emphasizing timing fidelity, thermal robustness, and noise immunity over generic data acquisition.

FAQ

What is the maximum recommended reference voltage for ADS8350IRTER?

The ADS8350IRTER supports a reference input voltage (REFIN-A/REFIN-B) from 2.25 V to AVDD/2. With nominal AVDD = 5 V, the maximum usable reference is 2.5 V. Exceeding this limit risks violating the absolute maximum rating for analog input voltage (AINP_x to REFGND_x ≤ AVDD + 0.3 V), potentially causing measurement saturation or damage. Always maintain AVDD ≥ 2 × VREF for full-scale linearity.

Does ADS8350IRTER require external op-amps for pseudo-differential input conditioning?

No, the ADS8350IRTER accepts pseudo-differential inputs directly - AINP-x and AINM-x are referenced to their respective REFGND-x pins, eliminating the need for external instrumentation amplifiers in many applications. However, if the source impedance exceeds 1 kΩ or common-mode voltage exceeds the REFGND-x tolerance, an op-amp buffer (e.g., OPA322 as shown in TI's reference schematics) is recommended to maintain DC accuracy and settling performance.

How does the thermal pad on ADS8350IRTER affect PCB layout?

The exposed thermal pad on the ADS8350IRTER (WQFN-16) must be soldered to a solid copper pour connected to GND for optimal thermal performance. TI specifies R_θJB = 7.3°C/W when properly attached - reducing junction temperature rise by ~30°C versus floating pad. Use ≥4 thermal vias (0.3-mm diameter) under the pad, filled or capped, and avoid splitting the GND plane beneath the device to prevent EMI coupling into sensitive analog inputs.

Can ADS8350IRTER operate with DVDD = 1.8 V while AVDD = 5 V?

Yes, ADS8350IRTER supports DVDD from 1.65 V to 5.5 V independently of AVDD (4.5–5.5 V). At DVDD = 1.8 V, digital I/O levels scale accordingly: VIH(min) = 1.26 V and VOL(max) = 0.36 V. This enables direct interfacing with 1.8-V microcontrollers or FPGAs without level shifters, provided timing margins (e.g., t_{D_CKDO} = 3–20 ns) are validated under actual load conditions.

What is the significance of separate REFGND-A and REFGND-B pins on ADS8350IRTER?

Separate REFGND-A and REFGND-B pins provide independent analog ground returns for each ADC channel's reference and input circuitry. This isolation prevents crosstalk between channels caused by shared ground impedance - critical when measuring high-current and high-voltage signals simultaneously (e.g., motor phase current and bus voltage). Routing each REFGND to its own low-impedance path minimizes offset drift and improves CMRR beyond 74 dB across dc to 20 kHz.