Texas Instruments ADS8342IBPFBT

Overview

ADS8342IBPFBT 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, selectable 8-/16-bit parallel interface, and TQFP-48 package. It integrates an on-chip sample-and-hold, 4:1 analog multiplexer, and 3-state parallel output drivers-designed for precision data acquisition in industrial process control systems requiring high linearity and low power.

For engineers reviewing the ADS8342IBPFBT datasheet, ADS8342IBPFBT pinout, ADS8342IBPFBT application, or ADS8342IBPFBT equivalent, this page delivers verified specifications, validated pin functions, confirmed thermal and timing behavior across –40°C to +85°C, and real-world substitution guidance for test & measurement and medical instrumentation designs.

Technical Context

The ADS8342IBPFBT implements a capacitor-based SAR architecture with inherent sample-and-hold, enabling accurate conversion of pseudo-differential analog inputs referenced to COMMON. Its internal clock divider (CLKDIV0/CLKDIV1) supports external clock frequencies up to 20MHz while maintaining a fixed 5MHz internal clock for consistent 250kSPS throughput.

Digital interface flexibility is achieved via BVDD-supplied I/O buffers supporting both 3.3V LVCMOS and 5V CMOS logic levels; BYTE pin selects 8-bit or 16-bit bus width; CONV initiates conversion asynchronously; BUSY provides real-time status; and A0/A1 address the 4-channel MUX-all synchronized to external CLK without internal PLL or FIFO.

Key Specifications

Pinout & Package

TQFP-48 package (PFB designation), 7mm × 7mm body, 0.5mm pitch, exposed thermal pad (not electrically connected). Pin 1 index corner marked; pins 1–2 and 34–35 are NC (no connection); AGND, DGND, and BGND internally tied but require separate PCB ground planes per layout best practice.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8342IBPFBT, ADS8343IPFBT trades speed and interface flexibility for channel count, while ADS8325IPFBT sacrifices bipolar capability and linearity for lower cost in unipolar-only systems - neither offers drop-in replacement due to differing input architecture, timing, or bus configuration.

Availability

ADS8342IBPFBT is available at Aetrix Electronics and suitable for industrial process control, test & measurement equipment, and medical instrumentation requiring stable component supply, long-lifecycle assurance, and traceable dual-sourced procurement.

Supply support for ADS8342IBPFBT 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 ADS8342IBPFBT belongs to TI's precision SAR ADC product line, engineered specifically for high-accuracy, low-power, multi-channel data acquisition in harsh industrial and medical environments - emphasizing bipolar input fidelity, thermal stability, and robust digital interfacing.

FAQ

What is the maximum sampling rate supported by the ADS8342IBPFBT?

The ADS8342IBPFBT supports a maximum sampling rate of 250kSPS when operated with a 5MHz external clock and CLKDIV0/CLKDIV1 set to 00 (1:1 division). This rate is maintained across the full –40°C to +85°C temperature range and requires ±5V analog/digital supplies and BVDD = 5V. At lower clock frequencies or higher division ratios, throughput scales linearly - e.g., 2.5MHz clock yields 125kSPS.

Does the ADS8342IBPFBT require an external reference voltage?

Yes, the ADS8342IBPFBT requires an external reference voltage applied to the REFIN pin. It accepts 2.0V to 2.55V, with optimal performance at 2.5V. The internal reference amplifier buffers REFIN from switching currents, allowing high-impedance sources (e.g., precision voltage references like REF5025) without external op-amps. A 0.22µF ceramic capacitor must be placed directly at REFIN for noise suppression.

How does the COMMON pin function in the ADS8342IBPFBT analog input structure?

The COMMON pin serves as the pseudo-differential reference for all four AINx inputs. Unlike true differential ADCs, COMMON is sampled once at conversion start and held - not resampled during conversion. Its voltage must remain within ±0.1V of AGND to preserve linearity. This architecture enables common-mode noise rejection in remote-sensing applications, such as isolated sensor interfaces where COMMON connects to a remote ground node.

Can the ADS8342IBPFBT interface directly with a 3.3V FPGA?

Yes, the ADS8342IBPFBT can interface directly with a 3.3V FPGA by setting BVDD = 3.3V (within 2.7–3.6V range). Its digital I/O pins then operate as LVCMOS-compliant: VIH ≥ 2.0V, VOL ≤ 0.2V at IOL = +100µA. No level shifters are needed. However, the analog supplies (±AVDD, ±DVDD) remain ±5V - ensuring full 16-bit dynamic range independent of digital logic voltage.

What is the significance of the 'B' suffix in ADS8342IBPFBT?

The 'B' in ADS8342IBPFBT denotes the enhanced performance grade: ±4 LSB integral linearity error (vs. ±6 LSB for standard 'I' grade) and guaranteed 16-bit no-missing-code operation (vs. 15-bit for 'I'). This grade is validated across the full –40°C to +85°C range and reflects tighter factory binning - critical for applications demanding highest code-to-code monotonicity and end-point accuracy without post-calibration.