Texas Instruments ADS8329IBPWR

Overview

ADS8329IBPWR from Texas Instruments is a low-power, 16-bit, 1-MSPS unipolar-input SAR analog-to-digital converter with built-in conversion clock, SPI/DSP-compatible serial interface, and daisy-chain capability. It features ±1.75 LSB max INL, ±1 LSB max DNL, 93 dB SNR at 10 kHz, and operates from 2.7 V to 5.5 V analog supply. It is used in high-precision industrial data acquisition systems requiring stable DC performance and low power.

For engineers reviewing the ADS8329IBPWR datasheet, ADS8329IBPWR pinout, ADS8329IBPWR application, or ADS8329IBPWR equivalent, key selection considerations include its unipolar input range (0 V to VREF), programmable EOC/INT polarity, deep power-down mode (4 nA), 4 × 4 QFN-16 package, and compatibility with 50 MHz SCLK for high-speed serial readout.

Technical Context

The ADS8329IBPWR implements a capacitor-based SAR architecture with inherent sample-and-hold, supporting both manual and auto-triggered conversion modes. Its internal 22.9 MHz conversion clock eliminates external timing components, while the dual-supply design separates analog (+VA) and digital I/O (+VBD) domains for noise isolation.

It supports SPI and TMS320 DSP serial protocols via FS/CS and SCLK, enables multi-device daisy chaining using CDI/SDO routing, and provides configurable status output (EOC/INT/CDI) with programmable polarity and duration-critical for real-time embedded control loops and synchronized sampling across sensor arrays.

Key Specifications

Pinout & Package

ADS8329IBPWR is housed in a 4 × 4 mm, 16-pin QFN package (RSA) with exposed thermal pad internally connected to substrate. The pad may be tied to AGND or left floating but must remain isolated from BDGND to preserve analog-digital separation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-resolution SAR ADC applications.

Compared with ADS8329IPWR and ADS8330IBPWR, the ADS8329IBPWR delivers optimized cost-performance for single-channel, unipolar, low-power industrial sensing-offering the tightest INL/DNL at 3 V operation while retaining full feature compatibility and footprint interchangeability in QFN-16.

Availability

ADS8329IBPWR is available at Aetrix Electronics and suitable for industrial process control, medical instrumentation, and portable data acquisition systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for ADS8329IBPWR 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 company specializing in analog, embedded processing, and high-reliability ICs for industrial, automotive, and communications markets.

The ADS8329IBPWR belongs to TI's precision SAR ADC family designed for high-accuracy, low-power data acquisition in harsh environments-emphasizing DC integrity, noise immunity, and seamless integration with microcontrollers and DSPs.

FAQ

What is the maximum sampling rate of the ADS8329IBPWR and under what supply conditions?

The ADS8329IBPWR achieves a maximum throughput rate of 1 MSPS when the analog supply +VA is between 3 V and 5.5 V. At lower supplies (2.7 V ≤ +VA < 3 V), the maximum rate is 900 kSPS. This is confirmed in the Electrical Characteristics table under "Sampling Dynamics" with test conditions specifying fSAMPLE = 1 MHz for 3 V ≤ +VA ≤ 5.5 V and fSAMPLE = 900 kHz for 2.7 V ≤ +VA < 3 V. The ADS8329IBPWR maintains full 16-bit performance across both ranges.

Does the ADS8329IBPWR require an external reference voltage, and what are its valid input ranges?

Yes, the ADS8329IBPWR requires an external reference applied between REF+ (pin 1) and REF– (pin 16). Valid reference ranges depend on +VA: for +VA ≥ 3 V, VREF may be 2.475 V to 3 V (at fSAMPLE > 500 kSPS) or 0.3 V to 2.525 V (at fSAMPLE ≤ 500 kSPS); for +VA = 4.5–5.5 V, VREF is 0.3 V to +VA. REF– must be connected to AGND via a dedicated via to maintain ±1.75 LSB INL performance per the datasheet.

Can the ADS8329IBPWR operate in daisy-chain mode, and how is it configured?

Yes, the ADS8329IBPWR supports daisy-chain mode using the EOC/INT/CDI pin (pin 4) as chain data input and SDO (pin 7) as chain data output. Configuration requires setting the device in chain mode via serial command, connecting SDO of one device to CDI of the next, and using shared CS, SCLK, and SDI lines. Timing diagrams (Figures 5–6) confirm valid setup/hold margins for CDI-to-SDO propagation (16 ns typical) in chain mode.

What power-down modes does the ADS8329IBPWR support, and what are their current draws?

The ADS8329IBPWR supports three power-down modes: Deep Power-Down (4–50 nA), Nap Power-Down (0.25–0.5 mA), and Auto Nap Power-Down (same current range, automatically entered after conversion). These values are measured at TA = –40°C to +85°C, +VA = 2.7–3.6 V, and +VBD = 1.65–1.5×(+VA), as specified in the "POWER-SUPPLY REQUIREMENTS" section of the Electrical Characteristics table.

Is the ADS8329IBPWR pin-compatible with other devices in the ADS832x family, and which ones share the same QFN-16 RSA package?

Yes, the ADS8329IBPWR is pin-compatible with ADS8329IRSAT, ADS8329IRSAR, ADS8329IBRSAT, ADS8329IBRSAR, ADS8330IBPWR, and ADS8330IBRSAR-all use the 4 × 4 mm QFN-16 RSA package. Pin functions match exactly per the "ADS8329 Terminal Functions" table, including identical assignments for CONVST (pin 3), FS/CS (pin 5), SDO (pin 7), SCLK (pin 9), and REF+ (pin 1). The ADS8330 variants differ only in +IN0/+IN1/COM pin mapping (pins 12–14), not in footprint or core interface pins.