Texas Instruments ADS8411IBPFBR

Overview

ADS8411IBPFBR from Texas Instruments is a 16-bit, 2 MSPS unipolar single-ended SAR analog-to-digital converter with integrated 4.096-V reference, 48-pin TQFP package, and parallel 8-/16-bit interface - designed for high-speed data acquisition in instrumentation and medical systems where zero-latency sampling and ±1.5 LSB INL over –40°C to 85°C are required.

For engineers reviewing the ADS8411IBPFBR datasheet, ADS8411IBPFBR pinout, ADS8411IBPFBR application, or ADS8411IBPFBR equivalent, key selection criteria include guaranteed 16-bit no-missing-codes performance, internal reference buffer capability, 400 ns conversion time, and support for both 8-bit microcontroller interfacing and full 16-bit bus transfer under industrial temperature conditions.

Technical Context

The ADS8411IBPFBR implements a capacitor-based successive approximation register (SAR) architecture with inherent sample-and-hold, using an internal oscillator to achieve 2 MHz throughput without external clocking. Its differential input stage accepts unipolar single-ended signals (0 V to V_REF) with +IN and –IN pins, where –IN is limited to –0.2 V to +0.2 V for common-mode rejection.

Conversion control relies on asynchronous CONVST falling-edge triggering and BUSY status signaling, while data readout supports two modes: full 16-bit parallel output (BYTE = 0) or dual-cycle 8-bit transfers (BYTE = 1). The device features CMOS-compatible digital I/O with separate analog (+VA) and digital bus (+VBD) supplies, and includes reset-independent abort functionality via the RESET pin.

Key Specifications

Pinout & Package

ADS8411IBPFBR is housed in a 48-lead TQFP (PFB) package with exposed thermal pad, optimized for industrial PCB layouts requiring low-inductance grounding and decoupling. Pin functions are validated per TI SLAS369B datasheet Rev. December 2004.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed SAR ADC applications.

Compared with ADS8411IBPFBR, ADS8412IBPFBT offers identical performance in a smaller reel format, while ADS8422IPFBT delivers higher speed and wider temperature range at the cost of increased power and tighter layout constraints.

Availability

ADS8411IBPFBR is available at Aetrix Electronics and suitable for high-speed data acquisition, medical instrumentation, and communications test equipment requiring stable component supply, long-term industrial lifecycle support, and guaranteed 16-bit performance across temperature.

Supply support for ADS8411IBPFBR 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 ADS8411IBPFBR belongs to TI's high-speed SAR ADC product line, engineered for applications demanding zero-latency, guaranteed 16-bit linearity, and integrated reference functionality in space- and cost-constrained systems.

FAQ

What is the guaranteed resolution and linearity performance of the ADS8411IBPFBR over temperature?

The ADS8411IBPFBR guarantees 16-bit resolution with no missing codes across the full industrial temperature range of –40°C to 85°C. Its integral nonlinearity (INL) is specified at ±2.5 LSB maximum, and differential nonlinearity (DNL) at ±0.8 LSB maximum - both tested and characterized per TI SLAS369B datasheet Rev. December 2004. This ensures consistent amplitude accuracy in precision measurement applications where code transitions must remain monotonic.

Does the ADS8411IBPFBR require an external clock source to operate at 2 MSPS?

No, the ADS8411IBPFBR does not require an external clock source. It uses an internal oscillator to generate the conversion clock, enabling guaranteed 2 MSPS throughput with a typical conversion time of 400 ns. This simplifies system design by eliminating clock distribution, jitter management, and synchronization overhead - a key advantage of the ADS8411IBPFBR in compact, noise-sensitive applications like portable medical devices.

How does the BYTE pin function in the ADS8411IBPFBR parallel interface?

The BYTE pin on the ADS8411IBPFBR controls data bus configuration: when BYTE = 0, DB15–DB0 deliver the full 16-bit result (D15–D0); when BYTE = 1, the first read returns D15–D8 on DB15–DB8, and the second read returns D7–D0 on the same pins. This allows seamless interfacing with 8-bit microcontrollers without external multiplexing logic - a defining feature of the ADS8411IBPFBR's flexible parallel architecture.

Can the ADS8411IBPFBR operate with an external voltage reference, and what are the requirements?

Yes, the ADS8411IBPFBR supports external reference operation via the REFIN pin, accepting 3.9 V to 4.2 V with ±20% reference resistance tolerance (500 kΩ typical). When using an external reference, REFOUT is left floating and REFIN is bypassed with a 0.1 µF capacitor to REFM. The internal 4.096-V reference remains disabled, preserving the ADS8411IBPFBR's flexibility for systems requiring traceable or temperature-stable external references.

What is the role of the RESET pin on the ADS8411IBPFBR, and how does it differ from CS-controlled reset?

RESET on the ADS8411IBPFBR is an asynchronous active-low input that immediately aborts the current conversion and clears all output latches to zero - independent of CS state or timing. It requires a minimum pulse width of 25 ns and guarantees abort within 50 ns. Unlike CS-based control, RESET provides deterministic, pin-level emergency recovery, making it critical for fault-tolerant systems where the ADS8411IBPFBR must respond to system-level watchdog events without software intervention.