Texas Instruments ADS8371IPFBR

Overview

ADS8371IPFBR 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, 110 dB SFDR, and operates from 2.7 V to 5.25 V digital supply over −40°C to +85°C for high-accuracy data acquisition in medical instruments and optical networking.

For engineers reviewing the ADS8371IPFBR datasheet, ADS8371IPFBR pinout, ADS8371IPFBR application, or ADS8371IPFBR equivalent, key selection criteria include unipolar 0 V to 4.096 V input range, 1.13 µs conversion time, CMOS-compatible digital interface timing, and TQFP-48 package compatibility with ADS8381/ADS8383.

Technical Context

The ADS8371IPFBR implements a capacitor-based SAR architecture with inherent sampling and hold, eliminating need for external S/H circuitry. Its internal conversion clock enables fixed 750-kSPS throughput without external clock source.

It supports dual-mode parallel output: full 16-bit bus access or 8-bit byte-read mode via BYTE pin control, with BUSY signal indicating conversion status and RD/CS enabling synchronized data capture. Input stage accepts differential analog signals with −IN limited to −0.2 V to +0.2 V and +IN spanning −0.2 V to V_REF + 0.2 V.

Key Specifications

Pinout & Package

ADS8371IPFBR is housed in a 48-pin TQFP (PFB) package with exposed thermal pad, rated for −40°C to +85°C operation. Pin assignments follow TI's standardized PFB layout with dedicated analog/digital ground separation and isolated power domains (+VA, +VBD).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8371IPFBR, ADS8381IPFB trades speed for resolution and adds complexity in thermal management, while ADS8361IPFB reduces integration but increases design risk from reference noise coupling-making ADS8371IPFBR optimal for balanced 750-kSPS, 16-bit industrial DAQ.

Availability

ADS8371IPFBR is available at Aetrix Electronics and suitable for medical instrumentation, optical networking, and high-accuracy data acquisition systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for ADS8371IPFBR 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 signal chain solutions.

The ADS8371IPFBR belongs to TI's precision SAR ADC product line, engineered for applications demanding high DC accuracy, low noise, and robust AC performance in industrial and medical environments.

FAQ

What is the maximum sample rate supported by the ADS8371IPFBR?

The ADS8371IPFBR supports a maximum sample rate of 750 kSPS, achieved through its internal conversion clock and 1.13 µs conversion time. This rate is fully characterized across the industrial temperature range (−40°C to +85°C) and maintains specified INL, SNR, and SFDR performance without external clocking or timing adjustments. The ADS8371IPFBR does not support oversampling or variable-rate modes beyond this fixed throughput.

Does the ADS8371IPFBR require an external reference voltage?

Yes, the ADS8371IPFBR requires an external reference voltage applied to the REFIN pin, with a valid range of 2.5 V to 4.2 V. While it includes an internal reference buffer, it does not contain a built-in reference generator. A low-noise, well-decoupled source such as the REF3040 is recommended, with mandatory 0.1 µF ceramic decoupling between REFIN and REFM pins. The ADS8371IPFBR achieves its specified 88 dB SNR only when driven by a clean reference meeting these conditions.

How does the BYTE pin affect data readout on the ADS8371IPFBR?

The BYTE pin on the ADS8371IPFBR configures the parallel interface for either 16-bit or 8-bit operation. When BYTE = 0, DB[15:0] outputs the full 16-bit result. When BYTE = 1, DB[15:8] outputs the lower byte (D[7:0]) of the 16-bit word, enabling sequential 8-bit reads on microcontrollers without 16-bit buses. This mode requires two read cycles per conversion and is electrically identical to the ADS8371IPFBR's native timing-no additional logic or glue components are needed.

What are the power supply requirements for the ADS8371IPFBR?

The ADS8371IPFBR 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 interface. AGND and BDGND must be connected at a single point near the device to prevent ground loops. At 750 kSPS, total supply current is 26–28 mA on +VA and ~1 mA on +VBD, resulting in 130–140 mW total dissipation. Operation outside these ranges invalidates AC specifications including SNR and THD.

Is the ADS8371IPFBR pin-compatible with other devices in its family?

Yes, the ADS8371IPFBR is directly pin-compatible with the ADS8381IPFB and ADS8383IPFB in the same 48-pin TQFP (PFB) package. All share identical pinout, power sequencing, and digital interface timing. However, ADS8381/ADS8383 offer 18-bit resolution and different AC specs (e.g., lower max sample rate), so firmware and layout may require validation for timing margins-but no PCB redesign is needed for drop-in replacement in footprint-constrained systems.