Texas Instruments ADS8411IPFBR

Overview

ADS8411IPFBR 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. It delivers ±1.5 LSB INL, 85 dB SINAD at 100 kHz, and zero-latency conversion for high-fidelity data acquisition in instrumentation and medical systems.

For engineers reviewing the ADS8411IPFBR datasheet, ADS8411IPFBR pinout, ADS8411IPFBR application, or ADS8411IPFBR equivalent, this page provides verified timing parameters (340–400 ns conversion), bus control logic (BYTE/CS/RD/BUSY), internal reference behavior, and real-world interface guidance for microcontroller-based sampling systems.

Technical Context

The ADS8411IPFBR employs 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 0 V to V_REF spans, with –IN limited to –0.2 V to +0.2 V and +IN to –0.2 V to V_REF + 0.2 V.

It supports dual-bus modes: full 16-bit parallel output (DB15–DB0) when BYTE = 0, or two-cycle 8-bit reads (MSB then LSB on DB15–DB8) when BYTE = 1. Conversion is triggered by CONVST falling edge while CS is low, with BUSY indicating active conversion and RD enabling data latching.

Key Specifications

Pinout & Package

ADS8411IPFBR is housed in a 48-pin TQFP (PFB) package with exposed thermal pad. Analog and digital grounds are segregated (AGND at pins 5, 8, 11, 12, 14, 15, 44, 45; BDGND at pins 25, 35), supporting noise-sensitive mixed-signal layout.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8411IPFBR, ADS8422IPFBR offers higher speed and lower power but removes the internal reference, increasing system complexity. AD7606BSTZ trades raw speed for channel count and integrated signal conditioning-making it unsuitable for single-channel >1 MSPS applications where ADS8411IPFBR's zero-latency and parallel interface deliver decisive timing advantage.

Availability

ADS8411IPFBR is available at Aetrix Electronics and suitable for medical instrumentation, high-speed data acquisition, and transducer interface applications requiring stable component supply, long-term industrial temperature support, and guaranteed 16-bit no-missing-codes performance.

Supply support for ADS8411IPFBR 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, embedded processing, and high-performance data converters for industrial, automotive, and communications markets.

The ADS8411IPFBR belongs to TI's precision high-speed SAR ADC product line, designed specifically for applications demanding zero-latency, high-resolution digitization with minimal external components and robust industrial temperature operation.

FAQ

What is the maximum sample rate supported by the ADS8411IPFBR?

The ADS8411IPFBR supports a maximum throughput rate of 2 MSPS, achieved with a typical conversion time of 400 ns and acquisition time of 100 ns. This allows sustained sampling at 2 million conversions per second under recommended operating conditions (+VA = 5 V, +VBD = 3 V or 5 V, TA = –40°C to +85°C). The device maintains 16-bit no-missing-codes performance across this full rate.

Does the ADS8411IPFBR require an external clock source?

No, the ADS8411IPFBR does not require an external clock source. It uses an internal oscillator to generate the conversion clock, enabling autonomous 2 MSPS operation. Timing is controlled solely by the CONVST, CS, and RD signals - simplifying system design and eliminating clock distribution jitter concerns that affect aperture performance.

How is the internal 4.096-V reference configured on the ADS8411IPFBR?

To use the internal reference on the ADS8411IPFBR, connect REFOUT (Pin 2) to REFIN (Pin 1) with a 0.1-µF ceramic capacitor, and place a 1-µF storage capacitor between REFOUT and REFM (Pins 47/48). This configuration activates the double-buffered internal reference, providing a stable 4.096 V ±30 mV output with 36 ppm/°C drift and 120 ms startup time.

Can the ADS8411IPFBR interface directly with an 8-bit microcontroller?

Yes, the ADS8411IPFBR supports direct 8-bit microcontroller interfacing via its BYTE pin (Pin 39). When BYTE = 1, the 16-bit result is read in two 8-bit cycles: first the MSB (D15–D8) appears on DB15–DB8, then the LSB (D7–D0) appears on the same pins after BYTE transitions high. This eliminates need for external data latches or bus transceivers.

What is the function of the BUSY pin on the ADS8411IPFBR?

The BUSY pin (Pin 36) is a status output that goes high at the start of conversion (within 30 ns of CONVST falling edge) and remains high until conversion completes, then goes low. It provides precise timing visibility into conversion progress - enabling interrupt-driven readout, hardware handshaking with FPGAs/DSPs, or synchronous polling without reliance on fixed delays.