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Texas Instruments ADS8329IRSAR
- Part No.:
- ADS8329IRSAR
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-VQFN Exposed Pad
- Datasheet:
-
ADS8329IRSAR.pdf
- Description:
- IC ADC 16BIT SAR 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,976
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Product details
Overview
ADS8329IRSAR 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, 93 dB SNR at 10 kHz, and operates from 2.7 V to 5.5 V analog supply - used in high-precision data acquisition systems requiring stable DC accuracy and low-noise AC performance.
For engineers reviewing the ADS8329IRSAR datasheet, ADS8329IRSAR pinout, ADS8329IRSAR application, or ADS8329IRSAR equivalent, key selection criteria include unipolar input range (0 V to VREF), 16-bit no-missing-codes resolution, internal CCLK generation, programmable EOC/INT polarity, and QFN-16 package thermal pad handling for analog ground isolation.
Technical Context
The ADS8329IRSAR implements a capacitor-based SAR architecture with inherent sample-and-hold, supporting both manual (CONVST-triggered) and auto-triggered conversion modes. Its conversion logic uses an internal 22.9 MHz CCLK (derived from SCLK) to achieve 18-cycle conversion time and 3-cycle acquisition window.
It supports SPI- and TMS320 DSP-compatible serial protocols via FS/CS and SCLK, with configurable status output (EOC/INT/CDI) and optional TAG bit for multi-device chain mode. The device separates analog (AGND) and digital interface (BDGND) grounds to minimize noise coupling in mixed-signal systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - guarantees monotonic transfer function and no missing codes over full temperature range. |
| Sampling Rate | 1 MSPS at +VA ≥ 3 V - enables real-time capture of signals up to ~400 kHz Nyquist bandwidth. |
| INL | ±1.75 LSB max - ensures ≤0.0027% full-scale linearity error for precision sensor interfacing. |
| SNR | 93 dB at fIN = 10 kHz - delivers effective resolution >15.2 bits for low-distortion signal digitization. |
| Power Dissipation | 15.5 mW at 1 MSPS, +VA = 3 V, +VBD = 1.8 V - suitable for battery-powered instrumentation. |
| Analog Supply Range | +VA = 2.7 V to 5.5 V - allows direct interfacing with 3.3 V or 5 V systems without level-shifting. |
| Reference Input | VREF = 2.5 V or 5 V - supports flexible scaling of unipolar input range (0 V to VREF). |
Pinout & Package
ADS8329IRSAR is packaged in a 4 × 4 mm, 16-pin QFN (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 integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (REF+) | External reference input | Accepts 0.3 V to +VA; sets full-scale range (0 V to VREF); requires low-impedance source due to 40 kΩ input resistance. |
| 3 (CONVST) | Conversion start trigger | Edge-sensitive input that freezes sample-and-hold and initiates conversion on next internal clock edge - independent of CS timing. |
| 4 (EOC/INT/CDI) | Status/data chain input | Configurable as end-of-conversion flag (active-low default), interrupt, or daisy-chain data input - polarity and function set via serial command. |
| 5 (FS/CS) | Frame sync / chip select | Active-low slave select for SPI; also serves as frame sync for TMS320 DSP interface - enables multi-device synchronization. |
| 7 (SDO) | Serial data output | CMOS output driving straight-binary 16-bit result MSB-first; tri-stated when CS is high or during power-down. |
| 13 (+IN) | Noninverting analog input | Differential input pair with –IN (Pin 14); accepts 0 V to VREF unipolar range - requires matched trace routing for optimal CMRR. |
| 15 (AGND) | Analog ground reference | Primary return for analog circuitry; must be star-connected to REF– and thermal pad (if grounded) to minimize noise injection. |
Key Features
| Feature | Design Value |
|---|---|
| Built-in conversion clock (CCLK) | Eliminates need for external clock generator; derived from SCLK (fCCLK = fSCLK/2), enabling self-timed conversions at up to 1 MSPS. |
| Programmable EOC/INT polarity | Allows firmware to match interrupt logic levels without external inverters - reduces BOM count and layout complexity. |
| Multi-chip daisy chain mode | Supports cascaded readout of multiple ADS8329 devices using single SCLK/SDI/SDO lines - cuts interface pin count by >50% in multi-channel systems. |
| Three power-down modes | Deep power-down (4 nA), Nap (0.3 mA), and Auto-Nap (auto-entry after conversion) enable dynamic power scaling for duty-cycled sensing. |
| Global CONVST with CS independence | Enables synchronized sampling across multiple converters even when CS is asserted asynchronously - critical for phase-coherent acquisition. |
Applications
| Medical Instrumentation | Industrial Process Control |
|---|---|
Use Scenario: High-resolution digitization of ECG/EEG biosignals with sub-microvolt noise floor requirements. IC Role / Device Role / Timing Role: Primary ADC capturing differential biopotential inputs at 1 MSPS with 16-bit linearity and 93 dB SNR. Use Value: ±1.75 LSB INL and 33 µV RMS noise ensure accurate detection of low-amplitude cardiac events without post-processing correction. | Use Scenario: Monitoring analog outputs from pressure, temperature, and flow transducers in PLC I/O modules. IC Role / Device Role / Timing Role: Precision front-end ADC converting 4–20 mA loop-derived voltages with calibrated offset/gain stability. Use Value: ±0.5 mV max offset error at 3 V and +0.4 ppm/°C drift maintain calibration integrity across –40°C to +85°C industrial environments. |
| Data Acquisition Systems | Magnetometer Interfaces |
Use Scenario: Modular DAQ cards acquiring synchronized multi-channel sensor data for lab-grade analysis. IC Role / Device Role / Timing Role: Single-ended 16-bit ADC operating in daisy-chain mode to reduce FPGA GPIO usage and simplify PCB routing. Use Value: Chain-mode operation with programmable TAG bit enables deterministic channel identification without additional address lines or timing overhead. | Use Scenario: Digitizing low-level fluxgate or AMR magnetometer outputs requiring high DC stability and low THD. IC Role / Device Role / Timing Role: Unipolar ADC accepting 0–2.5 V transducer output with 105 dB SFDR to resolve weak magnetic field harmonics. Use Value: –102 dB THD at 10 kHz and 70 dB CMRR suppress common-mode interference from nearby switching regulators or motor drives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8329IPWR | TSSOP-16 package (PW), same electrical specs, higher θJA (86°C/W vs. 47°C/W) | Less thermally efficient; preferred only where QFN reflow is unavailable or legacy board compatibility required | Select ADS8329IPWR only if TSSOP footprint is mandated; ADS8329IRSAR offers superior thermal performance and smaller area. |
| ADS8327IRSAR | 500 kSPS version, identical pinout and interface, lower power (7.8 mW at 500 kSPS) | Lower throughput limits usable bandwidth to ~200 kHz; suitable for slower sensors (e.g., RTDs, thermocouples) | Choose ADS8327IRSAR when 1 MSPS is unnecessary - achieves 50% lower power at half speed without layout change. |
Compared with ADS8329IPWR and ADS8327IRSAR, the ADS8329IRSAR provides optimal balance of speed (1 MSPS), thermal efficiency (QFN-16), and precision (±1.75 LSB INL), making it the preferred choice for space-constrained, high-throughput industrial and medical DAQ designs.
Availability
ADS8329IRSAR is available at Aetrix Electronics and suitable for medical instrumentation, industrial process control, and high-fidelity data acquisition systems requiring stable component supply, long-term manufacturability, and guaranteed lot traceability.
Supply support for ADS8329IRSAR 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 signal chains.
The ADS8329IRSAR belongs to TI's low-power, high-speed SAR ADC family designed for applications demanding 16-bit accuracy, sub-1 µV noise, and robust operation across –40°C to +85°C - targeting portable instrumentation, automated test equipment, and distributed sensor networks.
FAQ
What is the maximum sampling rate of the ADS8329IRSAR under 3-V analog supply conditions?
The ADS8329IRSAR achieves 1 MSPS sampling rate when +VA is between 3 V and 3.6 V. At 2.7 V ≤ +VA < 3 V, the maximum rate drops to 900 kSPS using external clocking - verified per TI SLAS516C Rev J specifications across the full industrial temperature range.
Does the ADS8329IRSAR require an external reference voltage, or does it support internal reference?
The ADS8329IRSAR requires an external reference voltage applied between REF+ and REF– pins; it has no internal reference. VREF must be 2.5 V or 5 V depending on +VA supply, with tolerance of ±0.025 V at 1 MSPS - confirmed in Electrical Characteristics tables for both 3-V and 5-V operation.
Can the ADS8329IRSAR operate with separate analog and digital supply voltages?
Yes - ADS8329IRSAR uses independent +VA (2.7–5.5 V, analog) and +VBD (1.65–5.5 V, digital I/O) supplies. This allows interfacing with 1.8-V microcontrollers while powering analog circuitry from 3.3 V, as validated in Power-Supply Requirements section of SLAS516C.
How is the thermal pad on the ADS8329IRSAR QFN package intended to be used?
The exposed thermal pad on the ADS8329IRSAR RSA package is internally connected to the silicon substrate and may be connected to AGND or left floating. TI explicitly cautions against connecting it to BDGND to prevent analog-digital ground coupling - documented in Pin Assignments section of SLAS516C.
Is the ADS8329IRSAR compatible with standard SPI interfaces, and what data format does it use?
Yes - ADS8329IRSAR supports SPI Mode 0 (CPOL = 0, CPHA = 0) and outputs straight-binary 16-bit data MSB-first on SDO. It also supports TMS320 DSP interface via FS/CS framing, with all timing parameters (e.g., tsu(SDI-SCLKF) = 8 ns) specified for interoperability - per Timing Characteristics tables.
ADS8329IRSAR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-VQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 1M
- Number of Inputs:
- 1
- Input Type:
- Differential, Single Ended
- Data Interface:
- SPI
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 1.65V ~ 5.5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 16-QFN (4x4)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS8329IRSAR FAQ
1.How can I place an order for ADS8329IRSAR through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS8329IRSAR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ADS8329IRSAR reliable?
The price and inventory of ADS8329IRSAR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS8329IRSAR is usually 5 days.
3.What payment methods are accepted for ADS8329IRSAR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS8329IRSAR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS8329IRSAR?
ADS8329IRSAR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS8329IRSAR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ADS8329IRSAR?
For technical support, including ADS8329IRSAR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS8329IRSAR requirements.
6.How does Aetrix verify that ADS8329IRSAR is sourced from the original manufacturer or authorized distributors?
All ADS8329IRSAR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ADS8329IRSAR meets industry standards.
7.What is the process for return or replacement of ADS8329IRSAR?
All ADS8329IRSAR units undergo pre-shipment inspection (PSI). If there is an issue with ADS8329IRSAR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ADS8329IRSAR part is unused and in its original packaging.
Return procedure for ADS8329IRSAR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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