Texas Instruments ADS8355IRTET

Overview

ADS8355IRTET from Texas Instruments is a dual, 16-bit, 1-MSPS simultaneous-sampling analog-to-digital converter with integrated dual programmable 2.5-V references, supporting both single-ended and pseudo-differential inputs. It delivers ±1-LSB INL, 88-dB SNR, and –97-dB THD across –40°C to +125°C, enabling high-fidelity position feedback in servo drives and power quality monitoring in three-phase UPS systems.

For engineers reviewing the ADS8355IRTET datasheet, ADS8355IRTET pinout, ADS8355IRTET application, or ADS8355IRTET equivalent, this page provides verified technical context, validated pin functions, confirmed AC/DC performance specs, and two rigorously cross-checked alternative parts for dual-channel industrial ADC selection.

Technical Context

The ADS8355IRTET implements two independent SAR ADC cores with fully synchronized sampling clocks and matched aperture delay (40 ps A-B match), enabling true simultaneous acquisition of two analog channels without inter-channel skew. Its flexible serial interface supports up to 50 MHz SCLK (DVDD ≥ 2.35 V) and operates across AVDD = 4.5–5.5 V and DVDD = 1.65–5.5 V.

Reference architecture allows independent configuration per channel: internal 2.5-V reference (programmable via REFDAC_A/B registers) or external reference on REFIO_A/REFIO_B, with 10-µF decoupling required per channel. Input full-scale range is selectable between VREF_x and 2×VREF_x via RANGE_SEL bit, subject to AVDD ≥ 2×VREF_x constraint.

Key Specifications

Pinout & Package

ADS8355IRTET is housed in a 16-pin WQFN package (3.00 mm × 3.00 mm) with an exposed thermal pad recommended for PCB ground connection.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8355IRTET, ADS8354IRTET removes internal reference flexibility but simplifies thermal design, while AD7606C-16BSTZ trades dual-channel optimization for scalability and analog integration-neither offers pin compatibility, but both serve overlapping industrial sensing use cases with distinct trade-offs in size, power, and feature depth.

Availability

ADS8355IRTET is available at Aetrix Electronics and suitable for servo drive position feedback, optical module monitoring, and three-phase UPS sensing requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ADS8355IRTET 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 over 90 years of innovation in precision data conversion and industrial-grade IC design.

The ADS8355IRTET belongs to TI's high-precision simultaneous-sampling ADC product line, engineered specifically for real-time control and power quality applications demanding matched channel timing, wide temperature operation, and flexible reference architecture.

FAQ

What is the maximum serial clock frequency supported by the ADS8355IRTET?

The ADS8355IRTET supports up to 50 MHz SCLK when DVDD ≥ 2.35 V, enabling full 1-MSPS throughput with minimal interface overhead. At lower DVDD (1.65–2.35 V), max SCLK is 24 MHz. Timing parameters including tSU_CKDI (2 ns setup) and tD_CKDO (19.5 ns delay) are fully specified across –40°C to +125°C, ensuring robust communication in industrial environments.

Does the ADS8355IRTET support true differential input mode?

No-the ADS8355IRTET supports only single-ended and pseudo-differential input modes. In pseudo-differential mode, AINM_A and AINM_B serve as common-mode references (e.g., VREF_A/2 or VREF_B/2), not true differential pairs. The device does not implement fully differential input stages or accept complementary signal pairs; its architecture is optimized for simultaneous single-ended acquisition with common-mode rejection via matched input paths.

How is reference matching between ADC_A and ADC_B characterized in the ADS8355IRTET?

The ADS8355IRTET specifies ±3 mV VREF-match between ADC_A and ADC_B at 25°C when internal reference is enabled (REFDAC_A = REFDAC_B = 0x1FF). This matching enables precise gain ratio calibration in dual-channel systems like motor phase current sensing. External reference matching depends on source impedance and layout-TI recommends separate 10-µF decoupling on REFIO_A and REFIO_B with dedicated REFGND_A/REFGND_B traces to maintain <1 mV effective mismatch.

Can the ADS8355IRTET operate with different reference voltages on Channel A and Channel B?

Yes-ADS8355IRTET supports independent reference configuration per channel. When using internal reference, REFDAC_A and REFDAC_B registers allow setting distinct output voltages (e.g., 2.5 V on A, 3.0 V on B). With external reference, REFIO_A and REFIO_B accept separate voltage sources, provided each meets the 2.4–AVDD range and is decoupled to its respective REFGND pin. This enables asymmetric full-scale ranges for mixed-signal acquisition.

What thermal management guidance applies to the ADS8355IRTET WQFN package?

The ADS8355IRTET WQFN-16 package features an exposed thermal pad requiring low-thermal-resistance connection to PCB ground plane. TI specifies RθJB = 7.3°C/W and RθJC(bot) = 0.9°C/W-achievable with ≥4 thermal vias (0.3-mm diameter) under the pad connected to an inner ground layer. Junction-to-ambient RθJA is 33.3°C/W; derating is required above 85°C ambient unless additional copper area or airflow is provided.