Texas Instruments ADS8328IPW

Overview

ADS8328IPW 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 ±2 LSB max INL and 91 dB SNR at 10 kHz, and targets precision data acquisition in industrial process control systems.

For engineers reviewing the ADS8328IPW datasheet, ADS8328IPW pinout, ADS8328IPW application, or ADS8328IPW equivalent, key selection considerations include its dual-channel unipolar input architecture, built-in conversion clock (10.5–12.6 MHz), EOC/INT/CDI programmable status pin, deep power-down mode (2–50 nA), and TSSOP-16 package compatibility with daisy-chain operation.

Technical Context

The ADS8328IPW implements a capacitor-based successive approximation register (SAR) architecture with inherent sample-and-hold, supporting both manual and auto-triggered conversion modes. Its 2:1 MUX enables channel selection between +IN0 and +IN1 with shared COM reference, while the programmable TAG bit identifies channel origin in chain mode.

Conversion timing is governed by an internal 10.5–12.6 MHz CCLK (or external SCLK up to 50 MHz), requiring 18 CCLK cycles for conversion and 3 CCLK cycles for acquisition. The EOC/INT/CDI pin serves triple function-end-of-conversion flag, interrupt output, or chain-data input-configurable via serial command.

Key Specifications

Pinout & Package

TSSOP-16 package (PW designation), 5.0 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 ADS8327IPW and AD7682BCPZ, the ADS8328IPW uniquely combines dual-channel MUX, programmable TAG output, and internal CCLK in a TSSOP-16 package - enabling compact, self-contained multi-sensor acquisition without added timing or control circuitry.

Availability

ADS8328IPW is available at Aetrix Electronics and suitable for industrial process control, medical instrumentation, magnetometer interface, and automatic test equipment requiring stable component supply and long-term manufacturing continuity.

Supply support for ADS8328IPW 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and personal electronics markets.

The ADS8328 belongs to TI's precision data acquisition portfolio, designed specifically for high-resolution, low-power, multi-channel sensor interfacing in harsh industrial and portable medical environments.

FAQ

What is the maximum sampling rate supported by the ADS8328IPW?

The ADS8328IPW supports a maximum throughput rate of 500 kSPS under all specified operating conditions. This rate is achieved using the internal conversion clock (CCLK) running at 10.5–12.6 MHz, with fixed 18-cycle conversion time and 3-cycle acquisition window. External SCLK up to 21 MHz (when used for both I/O and conversion) maintains this rate without bottlenecking.

Does the ADS8328IPW require an external reference voltage?

Yes, the ADS8328IPW requires an external precision reference applied between REF+ and REF− pins. It accepts 2.5 V or 4.096 V references depending on analog supply voltage (+VA), with REF− connected directly to AGND via a dedicated via. No internal reference is provided - accuracy and stability depend entirely on the external reference's performance.

How does the programmable TAG bit function in the ADS8328IPW?

The TAG bit in ADS8328IPW is a configurable 1-bit identifier appended to each 16-bit conversion result. When enabled, it indicates whether the sample originated from +IN0 (TAG = 0) or +IN1 (TAG = 1). This eliminates firmware-based channel tracking and simplifies data parsing in daisy-chain or multi-ADC systems where channel origin must be preserved.

Can the ADS8328IPW operate with separate analog and digital supplies?

Yes, the ADS8328IPW features independent analog (+VA: 2.7–5.5 V) and digital I/O (+VBD: 1.65–5.5 V) supplies. This separation allows optimization of noise immunity - e.g., +VA can be a low-noise LDO while +VBD runs from a switched regulator - and supports mixed-voltage host interfaces without level shifters.

What power-down modes are available in the ADS8328IPW and their typical current draw?

The ADS8328IPW offers three power-down modes: Deep Power-Down (2–50 nA), Nap Power-Down (0.2–0.5 µA), and Auto-Nap (0.2–0.4 µA). Deep mode disables all circuitry except wake-up logic; Nap retains register state and reference buffer; Auto-Nap automatically enters low-power state after conversion completes. All modes retain configuration registers across transitions.