Texas Instruments ADS8371IPFBT

Overview

ADS8371IPFBT from Texas Instruments is a 16-bit, 750-kSPS successive approximation register (SAR) analog-to-digital converter with integrated sample-and-hold, onboard reference buffer, and flexible 8-/16-bit parallel interface. It delivers ±0.9 LSB typical INL, 88 dB SNR, and 110 dB SFDR over −40°C to +85°C, targeting high-accuracy data acquisition in medical instruments and optical networking.

For engineers reviewing the ADS8371IPFBT datasheet, ADS8371IPFBT pinout, ADS8371IPFBT application, or ADS8371IPFBT equivalent, key selection considerations include unipolar 0 V to 4.096 V input range, 1.13 µs conversion time, CMOS-compatible digital interface with BUSY/CONVST/CS/RD control, and TQFP-48 package thermal performance (θ_JA = 86°C/W).

Technical Context

The ADS8371IPFBT employs a capacitor-based SAR architecture with inherent sampling and hold, eliminating need for external S/H circuitry. Its internal conversion clock enables deterministic 750-kSPS throughput without external timing source.

It supports dual-mode digital interfacing: full 16-bit parallel bus (DB0–DB15) or 8-bit multiplexed access via BYTE control, with BUSY signal indicating conversion status and RD/CS coordinating read cycles. Input common-mode rejection is enabled by differential inputs (+IN/−IN), where −IN is restricted to −0.2 V to +0.2 V while +IN spans −0.2 V to V_REF + 0.2 V.

Key Specifications

Pinout & Package

ADS8371IPFBT is housed in a 48-pin Thin Quad Flat Package (TQFP), PFB designation, with exposed thermal pad (not electrically connected). Package dimensions: 7 mm × 7 mm × 1.0 mm, pitch 0.5 mm. Thermal resistance θ_JA = 86°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed 16-bit SAR ADC applications.

Compared with ADS8381IPFBT and AD7606BSTZ, the ADS8371IPFBT provides the highest single-channel throughput (750 kSPS) in a compact 48-pin TQFP, optimized for low-latency, low-jitter digitization where 16-bit resolution suffices and board space is constrained.

Availability

ADS8371IPFBT is available at Aetrix Electronics and suitable for medical instrumentation, optical networking monitoring, and high-accuracy data acquisition systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for ADS8371IPFBT 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 connectivity technologies, with decades of expertise in precision data converters and industrial-grade IC design.

The ADS8371IPFBT belongs to TI's high-performance SAR ADC product line, engineered for applications demanding high resolution, low noise, and deterministic timing - particularly in test equipment, medical imaging, and communications infrastructure.

FAQ

What is the maximum recommended reference voltage for ADS8371IPFBT?

The ADS8371IPFBT supports an external reference voltage range of 2.5 V to 4.2 V at the REFIN pin. The datasheet specifies 4.096 V as the nominal reference for optimal LSB scaling (62.5 µV/LSB) and full 16-bit performance. Operating above 4.2 V risks violating absolute maximum ratings and degrading INL/SFDR; below 2.5 V reduces dynamic range and increases quantization noise impact.

Does ADS8371IPFBT require an external clock signal?

No, the ADS8371IPFBT does not require an external clock. It uses an internally generated conversion clock that sustains a fixed 750-kSPS throughput with 1.13 µs conversion time. System timing is controlled solely by the CONVST, CS, RD, and BYTE signals - simplifying clock tree design and eliminating jitter sources from external oscillators.

How is the 8-bit interface mode configured on ADS8371IPFBT?

The 8-bit interface mode on ADS8371IPFBT is selected by driving the BYTE pin high. When BYTE = 1, the 16-bit result is folded: DB[15:8] carries D[7:0] (low byte) and DB[7:0] carries D[15:8] (high byte), enabling two consecutive 8-bit reads. This mode maintains pin compatibility with 8-bit microcontrollers without requiring external demultiplexing logic.

What is the purpose of the REFM pins on ADS8371IPFBT?

The REFM pins (pins 47 and 48) serve as the dedicated reference ground return path for the internal reference buffer. They must be connected to a clean, low-impedance analog ground plane - separate from digital ground - and decoupled to REFIN via a 0.1 µF capacitor. This isolation prevents reference noise coupling and ensures stable 16-bit linearity and SFDR performance.

Can ADS8371IPFBT operate with a 3-V digital supply?

Yes, ADS8371IPFBT supports +VBD (digital buffer supply) from 2.7 V to 5.25 V. At +VBD = 3 V, all digital interface specifications (VIH/VIL, timing) remain valid per datasheet Tables 5 and 7. However, +VA (analog supply) must still be 4.75–5.25 V to maintain specified INL, SNR, and SFDR - ensuring analog performance is unaffected by lower digital rail voltage.