Texas Instruments ADS8328IBPW

Overview

ADS8328IBPW 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 ±1.5 LSB max INL over temperature, and supports unipolar 0 V to VREF input ranges up to 4.096 V - ideal for precision transducer interface in industrial data acquisition systems.

For engineers reviewing the ADS8328IBPW datasheet, ADS8328IBPW pinout, ADS8328IBPW application, or ADS8328IBPW equivalent, key selection considerations include its dual-channel MUX architecture, 100 dB SFDR at 10 kHz, built-in conversion clock (10.9–12.6 MHz), deep power-down mode (6 nA), and TSSOP-16 package compatibility with daisy-chain operation.

Technical Context

The ADS8328IBPW implements a capacitor-based successive approximation register (SAR) core with inherent sample-and-hold, supporting both manual and auto-triggered conversion modes. Its dual-input MUX enables channel selection via software or hardware CONVST, while the programmable EOC/INT/CDI pin provides flexible status signaling and daisy-chain capability.

It features a fully differential analog front-end with COM pin as common inverting input, reference inputs (REF+, REF−) accepting external 2.5 V or 4.096 V references, and independent I/O supply (+VBD) ranging from 1.65 V to 5.5 V - enabling level-shifting between analog and digital domains without signal degradation.

Key Specifications

Pinout & Package

TSSOP-16 package (PW designation), 5 mm × 4.4 mm body, 0.65 mm pitch, exposed thermal pad internally connected to substrate (recommended to connect to AGND).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8327IBPW and AD7682BCPZ-RL7, the ADS8328IBPW uniquely combines dual-input MUX, programmable TAG bit, and internal CCLK - making it optimal for cost-sensitive, space-constrained, multi-sensor systems requiring deterministic timing and minimal host overhead.

Availability

ADS8328IBPW is available at Aetrix Electronics and suitable for industrial process control, portable medical instrumentation, and automated test equipment requiring stable component supply and long-term production continuity.

Supply support for ADS8328IBPW 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 50 years of innovation in precision data converters and industrial-grade ICs.

The ADS8328 belongs to TI's precision SAR ADC product line, engineered for high-accuracy, low-power, multi-channel data acquisition in harsh industrial and medical environments - emphasizing robustness, temperature stability, and system-level integration.

FAQ

What is the maximum external SCLK frequency supported by the ADS8328IBPW?

The ADS8328IBPW supports SCLK frequencies up to 50 MHz when used solely as an I/O clock, and up to 21 MHz when simultaneously serving as both I/O and conversion clock. At 50 MHz, the minimum SCLK cycle time is 30 ns, enabling sub-1 µs serial readout of 16-bit results - critical for high-throughput data logging applications using the ADS8328IBPW.

Does the ADS8328IBPW require an external reference voltage?

Yes, the ADS8328IBPW requires an external reference applied between REF+ and REF− pins. It supports 2.5 V or 4.096 V references with 80 kΩ input impedance; REF− must be connected to AGND. The device does not include an internal reference, so precision external sources like REF5025 or REF6025 are recommended to achieve specified INL and gain error performance in the ADS8328IBPW.

How does the programmable TAG bit function in the ADS8328IBPW?

The TAG bit is a configurable 1-bit identifier appended to each 16-bit conversion result, indicating whether the sample came from +IN0 (TAG = 0) or +IN1 (TAG = 1). Enabled via SPI command, it eliminates software channel tracking overhead in continuous dual-channel acquisition - allowing the host to directly associate each ADS8328IBPW output word with its source without additional control signaling or timestamping.

Can the ADS8328IBPW operate with separate analog and digital supplies?

Yes, the ADS8328IBPW uses independent supplies: +VA (2.7–5.5 V) for analog circuitry and +VBD (1.65–5.5 V) for digital I/O. This separation allows level-shifting between domains - e.g., +VA = 5 V for sensor interface and +VBD = 1.8 V for low-voltage FPGA communication - reducing digital switching noise coupling into the analog path and preserving SNR in the ADS8328IBPW.

What are the power-down modes available on the ADS8328IBPW and their typical current draw?

The ADS8328IBPW offers three power-down modes: Deep Power-Down (6 nA typical), Nap Mode (0.3 mA), and Auto-Nap Mode (self-timed entry/exit). Deep Power-Down halts all internal clocks and resets registers, while Nap retains configuration and enables fast wake-up (<1 µs). These modes provide scalable energy savings in battery-powered applications using the ADS8328IBPW without compromising measurement readiness.