Texas Instruments ADS8342IBPFBR

Overview

ADS8342IBPFBR from Texas Instruments is a 4-channel, 16-bit successive approximation register (SAR) analog-to-digital converter with true bipolar input (±2.5V), 250kSPS maximum sampling rate, TQFP-48 package, and –40°C to +85°C operating temperature range. It integrates an on-chip sample-and-hold, parallel 3-state output interface, and supports selectable 8-/16-bit bus width for microprocessor interfacing in precision data acquisition systems.

For engineers reviewing the ADS8342IBPFBR datasheet, ADS8342IBPFBR pinout, ADS8342IBPFBR application, or ADS8342IBPFBR equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative options, and supply readiness for industrial test equipment and medical instrumentation designs.

Technical Context

The ADS8342IBPFBR implements a capacitor-based SAR architecture with inherent sample-and-hold, enabling accurate conversion of pseudo-differential analog inputs referenced to COMMON across four channels (AIN0–AIN3). Its internal clock divider (CLKDIV0/CLKDIV1) supports external clock frequencies up to 20MHz while maintaining 5MHz internal timing for 250kSPS throughput.

Dual ±5V analog/digital supplies (+AVDD/–AVDD, +DVDD/–DVDD) and independent I/O buffer supply (BVDD = 2.7V–5.5V) isolate noise-sensitive analog circuitry from digital switching domains. The REFIN/REFGND pair accepts 2.0V–2.55V external references, with buffered input eliminating need for high-current reference sources.

Key Specifications

Pinout & Package

TQFP-48 package with 0.5mm pitch, exposed thermal pad (not electrically connected), and lead-free RoHS-compliant finish per TI specification PFB.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8342IBPFBR, ADS8344IPFBT trades resolution and speed for cost, while ADS8325IPFBT offers superior linearity at the expense of channel count and throughput - both require layout changes due to different pinouts and supply configurations.

Availability

ADS8342IBPFBR is available at Aetrix Electronics and suitable for industrial process control, medical instrumentation, and laboratory equipment requiring stable component supply with long-term production continuity.

Supply support for ADS8342IBPFBR 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 IC design.

The ADS8342IBPFBR belongs to TI's precision SAR ADC product line, engineered for high-accuracy, low-noise data acquisition in demanding environments including medical diagnostics, automated test equipment, and factory automation.

FAQ

What is the maximum sampling rate supported by the ADS8342IBPFBR?

The ADS8342IBPFBR supports a maximum sampling rate of 250kSPS when operated with a 5MHz external clock and clock divider ratio set to 1:1. This rate is achievable across the full –40°C to +85°C temperature range and requires proper decoupling of ±5V analog and digital supplies as specified in the SBAS277 datasheet. At lower clock frequencies, throughput scales linearly - e.g., 2.5MHz clock yields 125kSPS.

Does the ADS8342IBPFBR require an external reference voltage?

Yes, the ADS8342IBPFBR requires an external reference voltage applied to the REFIN pin (Pin 41), with a valid range of 2.0V to 2.55V. The internal reference amplifier buffers this input, allowing use of high-output-impedance reference sources without additional op-amp drivers. A 0.22µF ceramic capacitor must be placed directly at the REFIN pin to suppress noise coupling, as specified in the TI SBAS277 datasheet.

How does the COMMON pin function in the ADS8342IBPFBR analog input stage?

The COMMON pin (Pin 44) serves as the pseudo-differential reference for all four analog inputs (AIN0–AIN3). It accepts a common-mode voltage ranging from –0.1V to +0.1V relative to AGND, enabling rejection of noise common to both AINx and COMMON. Unlike fully differential inputs, COMMON is sampled once at conversion start and held - it is not resampled during conversion, making careful grounding and low-impedance routing essential for optimal CMRR.

Can the ADS8342IBPFBR interface directly with a 3.3V microcontroller?

Yes, the ADS8342IBPFBR supports direct interfacing with 3.3V logic systems by setting BVDD (Pin 24) to 2.7V–3.6V. In this configuration, digital inputs (CS, RD, CONV, etc.) accept LVCMOS levels, and digital outputs (DB0–DB15, BUSY) drive 3.3V-compatible voltages (VOH ≥ BVDD – 0.3V, VOL ≤ 0.2V). No level-shifting circuitry is required, provided all digital signals remain within the absolute maximum ratings relative to BGND.

What is the significance of the 'B' suffix in ADS8342IBPFBR?

The 'B' in ADS8342IBPFBR denotes the enhanced performance grade: ±4 LSB maximum integral nonlinearity (INL) and 16-bit no-missing-codes guarantee, versus ±6 LSB INL for the standard 'I' grade (ADS8342IPFBR). This tighter linearity specification ensures higher measurement accuracy in calibration-critical applications such as medical diagnostics and metrology equipment, without requiring post-conversion linearization.