Texas Instruments ADS8327IBPW

Overview

ADS8327IBPW from Texas Instruments is a 16-bit, 500-kSPS unipolar-input SAR analog-to-digital converter with built-in conversion clock, SPI/DSP-compatible serial interface, and ±1 LSB max DNL over –40°C to +85°C. It operates from 2.7 V to 5.5 V analog supply and delivers 91 dB SNR at 10 kHz, targeting precision data acquisition in medical instruments and industrial process control.

For engineers reviewing the ADS8327IBPW datasheet, ADS8327IBPW pinout, ADS8327IBPW application, or ADS8327IBPW equivalent, key selection factors include its unipolar input range (0 V to VREF), deep power-down mode (2–50 nA), 16-pin TSSOP package, and compatibility with daisy-chain configurations for multi-channel systems.

Technical Context

The ADS8327IBPW implements a capacitor-based successive-approximation register (SAR) architecture with integrated sample-and-hold, enabling single-shot conversion without external timing components. Its internal 10.5–12.2 MHz conversion clock eliminates need for external oscillator while supporting up to 50 MHz external SCLK for high-speed serial readout.

It features programmable EOC/INT polarity, global CONVST independent of CS, and dual trigger modes (manual/auto) with configurable acquisition time (3 CCLK cycles). The device supports chain-mode operation via CDI/SDO routing and offers software reset and status bit output for system-level synchronization.

Key Specifications

Pinout & Package

ADS8327IBPW is housed in a 16-pin TSSOP (PW) package with exposed thermal pad internally connected to substrate. Pin 1 is +VA; pins 5 and 15 are AGND and BDGND respectively; pin 10 is EOC/INT/CDI (programmable status output); pin 11 is FS/CS (SPI frame sync/chip select).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8327IPW and ADS8329IPW, the ADS8327IBPW provides the tightest DC accuracy (±1 LSB DNL) and lowest deep-power current (2 nA), making it optimal for portable, battery-constrained, high-fidelity measurement systems requiring guaranteed monotonicity without post-processing correction.

Availability

ADS8327IBPW is available at Aetrix Electronics and suitable for medical instrumentation, industrial process control, and data acquisition systems requiring stable component supply, long-term lifecycle assurance, and traceable sourcing from authorized channels.

Supply support for ADS8327IBPW 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 ADS8327IBPW belongs to TI's precision SAR ADC product line, engineered specifically for high-resolution, low-power, unipolar-input applications in medical, test & measurement, and industrial sensing systems.

FAQ

What is the maximum external SCLK frequency supported by the ADS8327IBPW?

The ADS8327IBPW supports an external SCLK frequency up to 50 MHz when used solely as an I/O clock, and up to 21 MHz when serving both as I/O clock and conversion clock. This dual-mode flexibility allows designers to optimize between serial interface speed and internal timing autonomy. The ADS8327IBPW maintains full specification compliance across this range under industrial temperature conditions.

Does the ADS8327IBPW require an external reference voltage?

Yes, the ADS8327IBPW requires an external unipolar reference applied between REF+ (Pin 7) and REF– (Pin 6), with REF– connected to AGND. It accepts reference voltages from 0.3 V to 4.2 V depending on +VA supply, enabling full-scale ranges such as 2.5 V or 4.096 V. No internal reference is provided, so external reference stability and noise performance directly impact overall ADC accuracy.

How does the CONVST pin function in the ADS8327IBPW compared to CS?

The CONVST pin in the ADS8327IBPW initiates conversion independently of the CS signal - it freezes the sample-and-hold and triggers the SAR conversion sequence on the next rising edge of the internal clock. Unlike CS, which gates serial communication, CONVST provides deterministic, asynchronous sampling control essential for synchronized multi-channel acquisition. This separation ensures timing-critical sampling remains unaffected by SPI bus activity.

Can the ADS8327IBPW operate in daisy-chain mode, and what pins are involved?

Yes, the ADS8327IBPW supports daisy-chain mode using its EOC/INT/CDI (Pin 10) and SDO (Pin 13) pins. In chain mode, the SDO of one device connects to the CDI (i.e., EOC/INT/CDI) of the next, enabling serial readout of multiple ADC results over a single SPI bus. This configuration reduces controller GPIO usage and simplifies PCB routing in multi-channel systems, with timing coordinated via shared SCLK and CS signals.

What power-down modes are available on the ADS8327IBPW, and how do they differ?

The ADS8327IBPW offers three power-down modes: Deep Power-Down (2–50 nA), Nap Power-Down (0.2–0.4 mA), and Auto Nap Power-Down (automatic entry after conversion). Deep mode disables all circuitry except wake-up logic, ideal for extended standby; Nap mode retains register state and reference bias for faster wake-up (<1 µs); Auto Nap toggles automatically between active and Nap based on conversion activity - optimizing average power in burst-mode acquisition.