Texas Instruments ADS8371IBPFBT

Overview

ADS8371IBPFBT 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 ±1.5 LSB max INL, 88 dB SNR, 110 dB SFDR, and operates over −40°C to +85°C in medical instrumentation and high-accuracy data acquisition systems.

For engineers reviewing the ADS8371IBPFBT datasheet, ADS8371IBPFBT pinout, ADS8371IBPFBT application, or ADS8371IBPFBT equivalent, key selection criteria include unipolar 0 V to 4.096 V input range, 1.13 µs conversion time, CMOS-compatible digital interface, low 130 mW power at full throughput, and TQFP-48 package compatibility with ADS8381/ADS8383.

Technical Context

The ADS8371IBPFBT implements a capacitor-based SAR architecture with inherent sampling and hold, eliminating external S/H requirements. Its internal conversion clock enables deterministic 750-kSPS throughput without external timing sources.

It supports dual-mode digital interfacing: full 16-bit parallel bus (DB0–DB15) or 8-bit byte-read mode via BYTE control, with BUSY-driven status signaling and CS/RD-controlled read sequencing. Analog inputs are differential (+IN/−IN), 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

ADS8371IBPFBT is housed in a 48-pin Thin Quad Flat Package (TQFP), designated PFB, with 0.5 mm lead pitch and exposed thermal pad (not electrically connected). The package is RoHS-compliant and rated for −40°C to +85°C operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8371IBPFBT, ADS8381IPFBT trades linearity and noise for lower cost in single-channel systems, while ADS8364IPFBT provides channel simultaneity at reduced per-channel speed and incompatible layout-neither is a drop-in replacement.

Availability

ADS8371IBPFBT is available at Aetrix Electronics and suitable for medical instrumentation, optical networking, transducer interface, and high-accuracy data acquisition systems requiring stable component supply, long-term lifecycle support, and industrial temperature qualification.

Supply support for ADS8371IBPFBT 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 leadership in precision data converters.

The ADS8371IBPFBT belongs to TI's high-performance SAR ADC product line, engineered for applications demanding 16-bit accuracy, low noise, and deterministic timing in industrial, medical, and test equipment.

FAQ

What is the maximum recommended reference voltage for ADS8371IBPFBT?

The ADS8371IBPFBT supports an external reference voltage range of 2.5 V to 4.2 V at the REFIN pin. Its specified full-scale input span is optimized for 4.096 V, which aligns with standard 16-bit resolution scaling (2¹⁶ = 65536 steps × 62.5 µV/step). Operation at 4.096 V ensures minimal gain error and maximizes dynamic range utilization. Using voltages outside this range may degrade INL and SNR performance per datasheet Figure 21 and Figure 22.

Does ADS8371IBPFBT require an external conversion clock?

No, ADS8371IBPFBT does not require an external conversion clock. It features an internal oscillator that generates the precise timing needed for its 1.13 µs conversion cycle and 750-kSPS throughput. This eliminates clock routing complexity, jitter sensitivity, and external component count. The only required digital control signals are CONVST (to initiate conversion), BUSY (to monitor status), and CS/RD/BYTE (for data readout), as confirmed in the Timing Characteristics section (pages 6–7) and Principles of Operation (page 24).

Can ADS8371IBPFBT interface directly with an 8-bit microcontroller?

Yes, ADS8371IBPFBT supports direct 8-bit microcontroller interfacing via its BYTE pin. When BYTE = 1, the device outputs the lower byte (D[7:0]) of the 16-bit result on DB[7:0], then folds the upper byte (D[15:8]) onto the same pins during a second read cycle. This eliminates the need for external multiplexing or data alignment logic. The timing diagram in Figure 1 (page 10) and Digital Interface section (page 25) confirm full compatibility with 8-bit bus protocols using CS and RD handshaking.

What is the purpose of the REFM pin on ADS8371IBPFBT?

The REFM pin on ADS8371IBPFBT serves as the dedicated analog ground reference for the internal reference buffer and SAR array. It must be connected to AGND with a low-inductance, low-impedance path-separate from BDGND-to prevent digital switching noise from modulating the reference node. Datasheet page 9 specifies REFM as an input terminal, and Figure 38 (page 23) shows it tied directly to AGND adjacent to REFIN. Improper REFM grounding degrades SNR and increases THD, as verified in typical characteristics (Figures 23–24).

How does the ADS8371IBPFBT handle bipolar input signals?

The ADS8371IBPFBT natively supports unipolar 0 V to V_REF inputs, but bipolar signals can be accommodated using external signal conditioning. As shown in Figure 40 (page 25), a THS4031 op-amp in inverting configuration-with DC bias derived from REF3020/REF3040-shifts and scales the input so that the resulting +IN/−IN differential pair remains within the device's absolute ratings (−IN: −0.2 V to +0.2 V; +IN: −0.2 V to V_REF + 0.2 V). This preserves 87+ dB SNR and −90 dB THD at 100 kHz, per application note guidance.