Texas Instruments ADS8328IBPWG4

Overview

ADS8328IBPWG4 from Texas Instruments is a 16-bit, 500-kSPS pseudo-differential SAR analog-to-digital converter with integrated 2:1 input multiplexer, programmable TAG bit output, and SPI/DSP-compatible serial interface. It operates from 2.7 V to 5.5 V analog supply, delivers ±1 LSB max DNL and ±2 LSB max INL over temperature, and supports unipolar 0 V to VREF input ranges. It is used in high-precision industrial data acquisition systems requiring dual-channel sampling with low power and high AC performance.

For engineers reviewing the ADS8328IBPWG4 datasheet, ADS8328IBPWG4 pinout, ADS8328IBPWG4 application, or ADS8328IBPWG4 equivalent, key selection considerations include its dual-input MUX capability, programmable EOC/INT polarity, daisy-chain mode support, 91 dB SNR at 10 kHz, and TSSOP-16 package compatibility with industrial temperature range (–40°C to +85°C).

Technical Context

The ADS8328IBPWG4 implements a capacitor-based successive approximation register (SAR) architecture with built-in sample-and-hold and internal conversion clock (CCLK). Its dual-input MUX enables software- or auto-selectable channel switching between +IN0 and +IN1, with COM as common inverting input.

It features three power-down modes (deep, nap, auto-nap), global CONVST independent of CS, and configurable status output (EOC/INT/CDI) with programmable polarity. Serial communication supports SPI and TMS320 DSP protocols up to 50 MHz SCLK when used as I/O clock only.

Key Specifications

Pinout & Package

TSSOP-16 package (PW designation) with exposed thermal pad internally connected to substrate; pad may be tied to AGND or left floating but must remain isolated from digital ground.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8327IBPWG4, the ADS8328IBPWG4 adds essential dual-channel flexibility without sacrificing precision or power efficiency; versus ADS8328IPWR, it delivers tighter DC specifications critical for calibration-critical instrumentation.

Availability

ADS8328IBPWG4 is available at Aetrix Electronics and suitable for industrial process control, medical diagnostics, automated test equipment, and high-accuracy data logging requiring stable component supply across extended product lifecycles.

Supply support for ADS8328IBPWG4 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 over 90 years of innovation in precision signal chain solutions.

The ADS8328 belongs to TI's high-performance SAR ADC portfolio designed for industrial, medical, and test equipment applications demanding 16-bit resolution, low power, and robust serial interface reliability.

FAQ

What is the maximum external SCLK frequency supported by the ADS8328IBPWG4?

The ADS8328IBPWG4 supports up to 50 MHz SCLK when used solely as an I/O clock. When SCLK also serves as the conversion clock, the maximum is 21 MHz. This dual-mode clocking allows designers to optimize between interface speed and conversion timing control depending on system architecture requirements. The ADS8328IBPWG4 maintains full specification compliance across both modes.

Does the ADS8328IBPWG4 require an external reference voltage?

Yes, the ADS8328IBPWG4 requires an external reference applied between REF+ and REF− pins. It accepts 2.5 V or 4.096 V references, defining the full-scale input range (0 V to VREF). The device does not include an internal reference; reference accuracy and stability directly impact overall system gain error and measurement repeatability. The ADS8328IBPWG4 reference input impedance is 80 kΩ, enabling direct drive from precision voltage references.

How does the programmable TAG bit function in the ADS8328IBPWG4?

The TAG bit in the ADS8328IBPWG4 is appended to the 16-bit conversion result to indicate which input channel (+IN0 or +IN1) was sampled. When enabled via configuration register, the 17th bit (MSB+1) reflects the selected channel, eliminating software ambiguity in auto-channel-select mode. This feature simplifies firmware design in dual-sensor applications and ensures unambiguous data association without additional control signaling. The ADS8328IBPWG4 supports both manual and automatic TAG insertion.

Can the ADS8328IBPWG4 operate with separate analog and digital supply voltages?

Yes, the ADS8328IBPWG4 uses independent supplies: +VA (2.7–5.5 V) for analog circuitry and +VBD (1.65–1.5×+VA) for digital I/O. This separation minimizes digital switching noise coupling into the analog path. AGND and BDGND must be kept physically isolated on PCB except at a single-point system ground. The ADS8328IBPWG4 specifies distinct VIH/VIL thresholds referenced to +VBD, ensuring robust logic interfacing across mixed-supply systems.

What is the purpose of the COM pin in the ADS8328IBPWG4?

The COM pin in the ADS8328IBPWG4 serves as the common inverting input for both +IN0 and +IN1 channels, enabling pseudo-differential operation. When tied to AGND, it configures the device for unipolar 0–VREF input ranges on each channel. Unlike true differential inputs, COM does not swing; it establishes the reference point for differential subtraction within the SAR core. The ADS8328IBPWG4 achieves >100 dB channel isolation between +IN0 and +IN1 when COM is properly decoupled and grounded.