Texas Instruments ADS8411IBPFBT

Overview

ADS8411IBPFBT from Texas Instruments is a 16-bit, 2 MSPS unipolar successive-approximation register (SAR) analog-to-digital converter with integrated 4.096-V reference, 48-pin TQFP package, and parallel 8-/16-bit interface. It delivers ±1.5 LSB INL, 85 dB SINAD at 100 kHz, and 25 ps aperture jitter for high-fidelity data acquisition in instrumentation and medical systems.

For engineers reviewing the ADS8411IBPFBT datasheet, ADS8411IBPFBT pinout, ADS8411IBPFBT application, or ADS8411IBPFBT equivalent, this page provides verified timing parameters (340–400 ns conversion time), bus control logic (BYTE/CS/RD/BUSY), unipolar input range (0 V to 4.096 V), internal reference performance (36 ppm/°C drift), and industrial temperature operation (–40°C to +85°C).

Technical Context

The ADS8411IBPFBT implements a capacitor-based SAR architecture with inherent sample-and-hold, eliminating external hold circuitry. Its internal oscillator drives conversion without external clocking, enabling deterministic 2-MHz throughput with zero latency between sampling and digital output availability.

It supports dual-bus modes: full 16-bit parallel transfer via DB[15:0] when BYTE = 0, or two-cycle 8-bit reads (MSB then LSB on DB[15:8]) when BYTE = 1. The device uses separate analog (+VA) and digital (+VBD) supplies (5 V and 3–5 V), with dedicated AGND and BDGND planes to suppress supply coupling.

Key Specifications

Pinout & Package

ADS8411IBPFBT is housed in a 48-pin Thin Quad Flat Package (TQFP), 7 mm × 7 mm, 0.5 mm pitch, with exposed thermal pad (PFB designation). 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 ADS8412IBPFBT and AD7606BSTZ, the ADS8411IBPFBT uniquely balances 2-MSPS throughput, 25-ps aperture jitter, and integrated unipolar reference in a compact TQFP - making it optimal for cost- and size-sensitive single-channel high-fidelity acquisition where bipolar input is unnecessary.

Availability

ADS8411IBPFBT is available at Aetrix Electronics and suitable for high-speed instrumentation, medical data acquisition, and transducer interface applications requiring stable component supply, long-lifecycle support, and guaranteed industrial temperature performance.

Supply support for ADS8411IBPFBT 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 ICs.

The ADS8411IBPFBT belongs to TI's high-speed SAR ADC product line, engineered for applications demanding zero-latency, low-power, and metrology-grade linearity - particularly in portable test equipment and clinical diagnostics.

FAQ

What is the maximum sample rate supported by the ADS8411IBPFBT?

The ADS8411IBPFBT supports a maximum throughput rate of 2 MSPS, with a typical conversion time of 400 ns and acquisition time of 100 ns. This rate is sustained across the full industrial temperature range (–40°C to +85°C) and is enabled by its internal oscillator - no external clock is required. At 2 MSPS, the ADS8411IBPFBT achieves 85 dB SINAD and 90 dB SFDR at 100 kHz input frequency.

Does the ADS8411IBPFBT require an external reference voltage?

No, the ADS8411IBPFBT includes a factory-trimmed 4.096-V internal reference with ±0.75 mV offset error and 36 ppm/°C drift. When using the internal reference, connect REFOUT to REFIN with a 0.1-µF decoupling capacitor and place a 1-µF storage capacitor between REFOUT and REFM pins. An external reference (3.9 V to 4.2 V) may be used via REFIN, but the internal reference eliminates BOM cost and layout area for most unipolar applications.

How does the BYTE pin affect data readout on the ADS8411IBPFBT?

The BYTE pin configures the ADS8411IBPFBT's parallel interface mode: when BYTE = 0, the full 16-bit result appears on DB[15:0]; when BYTE = 1, the device outputs the 8 MSBs on DB[15:8] during the first read cycle, then the 8 LSBs on the same pins during the second read. This allows seamless integration with 8-bit microcontrollers without external multiplexing, while preserving full 16-bit resolution across two cycles.

What are the power supply requirements for the ADS8411IBPFBT?

The ADS8411IBPFBT requires two independent supplies: +VA (4.75 V to 5.25 V) for the analog core and +VBD (2.7 V to 5.25 V) for the digital I/O interface. Typical +VA current is 38 mA at 2 MSPS, yielding 175 mW total power dissipation. Separate AGND and BDGND connections are mandatory to prevent digital noise from degrading analog performance - especially critical for achieving <1 LSB DNL and 85 dB SINAD.

Can the ADS8411IBPFBT interface directly with a microcontroller lacking a dedicated interrupt input?

Yes - the BUSY pin serves as a status indicator that can be polled or used as an active-low interrupt. In polling mode, software checks BUSY before asserting RD/CS to read data. For interrupt-driven operation, tie BUSY to any GPIO capable of detecting falling edges; the ADS8411IBPFBT asserts BUSY high at conversion start and clears it low within 5 ns of completion (tpd2), enabling precise timing alignment. TI Application Note SLAS369B Figure 29 shows a verified 8-bit MCU interface schematic.