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Texas Instruments ADS8329IRSAT
- Part No.:
- ADS8329IRSAT
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-VQFN Exposed Pad
- Datasheet:
-
ADS8329IRSAT.pdf
- Description:
- IC ADC 16BIT SAR 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,790
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Product details
Overview
ADS8329IRSAT from Texas Instruments is a low-power, 16-bit, 1-MSPS unipolar-input SAR analog-to-digital converter with built-in conversion clock, serial SPI/DSP 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. It is used in high-precision data acquisition systems requiring stable DC accuracy and low-noise AC performance.
For engineers reviewing the ADS8329IRSAT datasheet, ADS8329IRSAT pinout, ADS8329IRSAT application, or ADS8329IRSAT equivalent, this page delivers verified specifications, validated pin functions, confirmed industrial-temperature operation (–40°C to +85°C), and real-world design context for transducer interface, medical instrumentation, and industrial process control implementations.
Technical Context
The ADS8329IRSAT implements a capacitor-based successive approximation register (SAR) architecture with inherent sample-and-hold, enabling single-ended unipolar input (0 V to VREF) without external front-end circuitry. Its internal 22.9 MHz conversion clock eliminates need for external timing sources in most configurations.
It supports both manual and auto-triggered conversion modes via CONVST, provides programmable EOC/INT polarity and status output, and enables multi-device daisy chaining using CDI/SDO routing - all while maintaining 16-bit no-missing-codes performance across its full industrial temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit with guaranteed no missing codes - ensures monotonicity and full-scale linearity in precision measurement systems. |
| Sampling Rate | 1 MSPS at +VA ≥ 3 V; 900 kSPS at +VA = 2.7 V - supports high-speed transient capture while scaling power with supply voltage. |
| INL | ±1.75 LSB max (ADS8329IB grade) - enables <0.003% full-scale error in calibrated systems without post-conversion correction. |
| SNR | 93 dB at fIN = 10 kHz (VREF = 5 V) - delivers >15.5 effective bits for low-distortion signal digitization. |
| Power Dissipation | 15.5 mW at 1 MSPS, +VA = 3 V, +VBD = 1.8 V - allows battery-powered or thermally constrained embedded designs. |
| Operating Temperature | –40°C to +85°C - fully specified for industrial and automotive under-hood environments without derating. |
| Reference Input | External 0.3 V to +VA, up to 5.5 V - supports flexible reference selection including internal LDOs or precision external refs. |
Pinout & Package
ADS8329IRSAT 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 digital ground.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (REF+) | Reference input positive | Accepts external voltage reference (0.3 V to +VA); sets full-scale range for unipolar conversion. |
| 2 (NC) | No connection | Internally unconnected; must be left floating or tied to AGND per layout guidelines. |
| 3 (CONVST) | Conversion start trigger | Edge-sensitive input that freezes S/H and initiates conversion on next internal clock edge. |
| 4 (EOC/INT/CDI) | Status/output/data input | Configurable as end-of-conversion flag, interrupt, or chain-data input in daisy-chain mode. |
| 5 (FS/CS) | Frame sync / chip select | Active-low SPI slave select; also serves as frame sync for TMS320 DSP interface. |
| 6 (SDI) | Serial data input | Accepts configuration commands (e.g., reset, polarity setup) and supports software reset. |
| 7 (SDO) | Serial data output | 3-state output delivering 16-bit straight-binary result; supports MSB-first daisy-chain readout. |
| 8 (BDGND) | Digital interface ground | Separate ground for +VBD-supplied I/O; must be routed separately from AGND to minimize noise coupling. |
| 9 (SCLK) | Serial clock input | Accepts up to 50 MHz clock for SPI interface; doubles as conversion clock when configured externally. |
| 10 (+VBD) | Digital I/O supply | 1.65 V to 5.5 V supply for digital interface; independent of analog +VA rail for mixed-signal isolation. |
| 11 (+VA) | Analog supply | 2.7 V to 5.5 V analog power; directly impacts sampling rate, noise, and reference compliance. |
| 12 (RESERVED) | Internal function | Must be connected to AGND or +VA per datasheet; not user-accessible for signal routing. |
| 13 (+IN) | Analog input noninverting | Main unipolar input node; full-scale range = 0 V to VREF, with ±0.2 V absolute input limits. |
| 14 (–IN) | Analog input inverting | Typically grounded for unipolar operation; defines differential input span when used actively. |
| 15 (AGND) | Analog ground | Primary analog reference plane; requires low-impedance connection to REF– and thermal pad if grounded. |
| 16 (REF–) | Reference input negative | Connected to AGND via dedicated via; establishes reference common point for accuracy and PSRR. |
Key Features
| Feature | Design Value |
|---|---|
| Built-in conversion clock (CCLK) | 22.9 MHz typical internal oscillator eliminates external crystal/clock source and reduces BOM count. |
| Comprehensive power-down modes | Deep power-down (4 nA), Nap (0.3 mA), and Auto-Nap enable dynamic power scaling for burst-mode acquisition. |
| Programmable EOC/INT polarity | Allows synchronization with host controller's active-high or active-low interrupt logic without level-shifting. |
| Multi-chip daisy chain support | Enables synchronized sampling across multiple ADS8329IRSAT devices using CDI/SDO routing and shared SCLK/CS. |
| Global CONVST with CS independence | Supports simultaneous sampling across distributed ADCs even when individual CS lines are asserted at different times. |
Applications
| High-Accuracy Transducer Interface | Portable Medical Instrumentation |
|---|---|
|
Use Scenario: Digitizing low-level outputs from strain gauges, RTDs, or pressure sensors in handheld diagnostic tools. IC Role / Device Role / Timing Role: Primary ADC capturing DC-stable sensor signals with minimal offset drift and high CMRR. Use Value: ±0.5 mV max offset error at 3 V and ±1.75 LSB INL ensure sub-0.1% system accuracy without factory calibration. |
Use Scenario: Sampling ECG, EEG, or pulse oximetry waveforms in battery-powered patient monitors. IC Role / Device Role / Timing Role: Low-power, high-SNR front-end ADC operating at 1 MSPS with 93 dB SNR at 10 kHz. Use Value: 15.5 mW power at 3 V enables >24-hour runtime on coin-cell batteries while preserving diagnostic fidelity. |
| Industrial Process Control Loop | Automated Test Equipment (ATE) |
|
Use Scenario: Monitoring analog feedback signals (e.g., motor current, temperature, flow) in PLC I/O modules. IC Role / Device Role / Timing Role: Precision ADC with robust noise immunity, PSRR >78 dB, and –40°C to +85°C operation. Use Value: 70 dB CMRR and 78 dB PSRR maintain accuracy in electrically noisy factory environments with shared power rails. |
Use Scenario: High-speed digitization of DUT output waveforms during functional testing of analog ICs or RF components. IC Role / Device Role / Timing Role: 1-MSPS SAR ADC with 10 ps aperture jitter and 100 ns overvoltage recovery. Use Value: 105 dB SFDR and 93 dB SNR support characterization of low-distortion signals up to 100 kHz bandwidth. |
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 |
|---|---|---|---|
| ADS8327IRSAT | 500 kSPS max sampling rate; identical 16-bit resolution, INL, and QFN-16 package. | Lower throughput suits cost-sensitive, lower-bandwidth systems (e.g., environmental monitoring). | Select when 1 MSPS is unnecessary and power budget allows higher per-sample energy. |
| ADS7279IPWR | 14-bit resolution, 500 kSPS, TSSOP-16 package; lower DC accuracy (±2.5 LSB INL) and SNR (86 dB). | Targeted at general-purpose industrial sensing where 16-bit precision is not required. | Choose for legacy TSSOP footprint compatibility or reduced cost where 14-bit resolution suffices. |
Compared with ADS8327IRSAT and ADS7279IPWR, the ADS8329IRSAT delivers 2× higher throughput and 2-bit higher resolution - critical for time-domain waveform analysis and closed-loop control latency reduction - while maintaining identical package size and industrial temperature rating.
Availability
ADS8329IRSAT is available at Aetrix Electronics and suitable for high-precision data acquisition systems, portable medical instrumentation, and industrial process control applications requiring stable component supply, long-term lifecycle support, and guaranteed industrial-temperature performance.
Supply support for ADS8329IRSAT 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 chain solutions.
The ADS8329IRSAT belongs to TI's low-power, high-speed SAR ADC family designed specifically for applications demanding 16-bit accuracy, sub-100 ps aperture jitter, and flexible serial interfacing in space- and power-constrained industrial and medical systems.
FAQ
What is the maximum sampling rate of the ADS8329IRSAT and under what conditions?
The ADS8329IRSAT achieves a maximum sampling rate of 1 MSPS when the analog supply voltage (+VA) is between 3 V and 5.5 V. At +VA = 2.7 V, the maximum rate drops to 900 kSPS. This voltage-dependent throughput is explicitly specified in the Electrical Characteristics tables and reflects internal clock scaling to maintain timing margins and accuracy across the full supply range.
Does the ADS8329IRSAT require an external reference voltage?
Yes, the ADS8329IRSAT requires an external reference voltage applied between REF+ and REF– pins. It accepts references from 0.3 V up to +VA (max 5.5 V), with typical use cases at 2.5 V or 5 V. The device does not include an internal reference; reference stability and accuracy directly determine overall system gain error and SNR performance.
Can the ADS8329IRSAT operate with separate analog and digital supplies?
Yes, the ADS8329IRSAT uses two independent supplies: +VA (2.7 V to 5.5 V) for analog circuitry and +VBD (1.65 V to 5.5 V) for digital I/O. This separation enables noise isolation, mixed-voltage system integration (e.g., 1.8 V MCU with 3.3 V analog sensors), and optimized power domain management without compromising AC or DC performance.
What is the purpose of the RESERVED pin (Pin 12) on the ADS8329IRSAT?
Pin 12 is labeled RESERVED in the ADS8329IRSAT datasheet and must be connected either to AGND or +VA - not left floating. This pin is not user-accessible for signal routing and serves an internal function related to die biasing or ESD protection. Incorrect handling (e.g., leaving unconnected or tying to noisy nodes) may degrade INL or increase susceptibility to latch-up.
How does the ADS8329IRSAT support daisy-chain configurations?
The ADS8329IRSAT supports daisy chaining via its EOC/INT/CDI pin, which functions as a chain-data input when enabled. In chain mode, multiple ADS8329IRSAT devices share SCLK and FS/CS, with SDO of one device connected to CDI of the next. This enables synchronized sampling and sequential 16-bit readout using a single SPI bus, reducing controller pin count and PCB routing complexity.
ADS8329IRSAT 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:
- -
ADS8329IRSAT FAQ
1.How can I place an order for ADS8329IRSAT through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS8329IRSAT 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 ADS8329IRSAT reliable?
The price and inventory of ADS8329IRSAT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS8329IRSAT is usually 5 days.
3.What payment methods are accepted for ADS8329IRSAT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS8329IRSAT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS8329IRSAT?
ADS8329IRSAT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS8329IRSAT 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 ADS8329IRSAT?
For technical support, including ADS8329IRSAT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS8329IRSAT requirements.
6.How does Aetrix verify that ADS8329IRSAT is sourced from the original manufacturer or authorized distributors?
All ADS8329IRSAT 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 ADS8329IRSAT meets industry standards.
7.What is the process for return or replacement of ADS8329IRSAT?
All ADS8329IRSAT units undergo pre-shipment inspection (PSI). If there is an issue with ADS8329IRSAT, 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 ADS8329IRSAT part is unused and in its original packaging.
Return procedure for ADS8329IRSAT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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