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Texas Instruments ADS8331IRGET
- Part No.:
- ADS8331IRGET
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-VFQFN Exposed Pad
- Datasheet:
-
ADS8331IRGET.pdf
- Description:
- IC ADC 16BIT SAR 24VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,616
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Product details
Overview
ADS8331IRGET from Texas Instruments is a low-power, 16-bit, 500-kSPS successive approximation register (SAR) analog-to-digital converter with integrated 4-channel unipolar multiplexer, on-chip conversion clock, and SPI/DSP-compatible serial interface. It operates from 2.7 V to 5.5 V analog supply, achieves ±1.2 LSB typical INL and 91.5 dB SNR at 1 kHz, and targets precision data acquisition in space-constrained industrial sensor interfaces.
For engineers reviewing the ADS8331IRGET datasheet, ADS8331IRGET pinout, ADS8331IRGET application, or ADS8331IRGET equivalent, key selection considerations include its 4-channel mux architecture, 24-pin VQFN (4 mm × 4 mm) package, deep power-down mode (50 nA), daisy-chain capability, and support for unipolar input spans up to 4.096 V with external reference.
Technical Context
The ADS8331IRGET implements a capacitor-based SAR ADC core with inherent sample-and-hold, enabling single-cycle 16-bit conversions at up to 500 kSPS. Its internal conversion clock (10.5–12.2 MHz) eliminates need for external timing components, while flexible trigger modes-global CONVST independent of CS, auto/manual channel select-support synchronized multi-device sampling.
Digital interface compliance includes SPI Mode 0/3 and TMS320 DSP frame-sync protocols, with programmable EOC/INT polarity and 3-state SDO output. The device supports daisy-chain operation via EOC/INT/CDI pin reconfiguration and offers three powerdown states: Nap (325 µA), Auto-NAP (8.7 mW at 250 kSPS), and Deep PD (50 nA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit SAR with no missing codes over temperature - guarantees monotonicity and full-scale accuracy in closed-loop control. |
| Sampling Rate | Up to 500 kSPS - enables real-time capture of fast transients in motor current sensing or vibration monitoring. |
| INL / DNL | ±1.2 LSB typical INL, ±0.6 LSB typical DNL at 2.7 V - ensures <0.002% linearity error for high-fidelity medical instrumentation. |
| SNR / THD | 91.5 dB SNR, –100 dB THD at 1 kHz (5 V, 4.096 VREF) - supports 15.5 effective bits for precision signal analysis. |
| Power Consumption | 14.2 mW at 500 kSPS (VA = 2.7 V, VBD = 1.65 V); 50 nA in Deep PD - extends battery life in portable diagnostic equipment. |
| Analog Input | 4-channel unipolar mux with breakout, 0–VREF range (1.2–4.096 V) - simplifies front-end design for multi-sensor systems without external mux ICs. |
| Interface | SPI/DSP-compatible serial interface, 40 MHz SCLK max (5 V), daisy-chain capable - reduces MCU GPIO count and PCB routing complexity. |
Pinout & Package
ADS8331IRGET is packaged in a 24-pin VQFN (RGE) with 4.00 mm × 4.00 mm body size and exposed thermal pad (to be connected to AGND). Pin functions are validated per TI SBAS363E Rev E datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN[0:3] | Multiplexer analog inputs | Four unipolar input channels; IN0–IN3 connect directly to sensors or signal conditioning stages. |
| ADCIN | ADC input node | Output of internal mux; routed to SAR core-requires low-impedance drive and proper decoupling. |
| COM | Common-mode reference | Typically tied to AGND; defines offset point for all unipolar inputs (INx – COM). |
| REF+, REF– | External reference terminals | Accept 1.2–4.096 V reference voltage; REF– must be connected to AGND via dedicated via for noise isolation. |
| CONVST | Conversion start trigger | Edge-sensitive input that freezes sample-and-hold and initiates conversion-operates independently of FS/CS. |
| FS/CS | Frame sync / chip select | Enables SPI communication; low-active; supports daisy-chain mode when paired with EOC/INT/CDI pin. |
| SCLK, SDI, SDO | Serial interface signals | CMOS-level SPI bus; SDO is 3-state; supports up to 40 MHz clock (5 V) and 25 MHz (2.7 V). |
| EOC/INT/CDI | Status/data chain pin | Configurable as end-of-conversion flag, interrupt output, or daisy-chain data input-enables multi-ADC synchronization. |
| RESET | Hardware reset | Active-low asynchronous reset; initializes internal logic and clears configuration registers. |
| VA, VBD | Supply rails | VA (2.7–5.5 V) powers analog core; VBD (1.65–VA+0.2 V) powers digital I/O-allows mixed-voltage system interfacing. |
| AGND, DGND | Ground returns | Separate analog/digital ground pins require star-point connection or split-plane layout to minimize noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip 4-channel unipolar mux with breakout | Eliminates external analog switch ICs and associated layout complexity in multi-sensor DAQ systems. |
| Programmable EOC/INT polarity and daisy-chain mode | Enables deterministic timing across multiple converters without additional glue logic or FPGA resources. |
| Three powerdown modes (Deep PD, Nap, Auto-NAP) | Reduces average system power by >99% during idle periods-critical for battery-powered field instruments. |
| Separate VA and VBD supplies | Permits direct interfacing with 1.8 V or 3.3 V microcontrollers while maintaining full analog performance. |
| Global CONVST independent of CS | Supports simultaneous sampling across multiple ADS8331IRGET devices using a single trigger line. |
Applications
| Industrial Process Monitoring | Medical Diagnostic Equipment |
|---|---|
|
Use Scenario: Continuous acquisition of temperature, pressure, and flow sensor outputs in PLC-based control cabinets. IC Role / Device Role / Timing Role: 16-bit SAR ADC with 4-channel mux performs synchronized sampling of analog process variables at 250–500 kSPS. Use Value: ±1.2 LSB INL ensures accurate calibration traceability; Deep PD mode cuts standby power to 50 nA for energy-efficient edge nodes. |
Use Scenario: High-resolution waveform capture in portable ECG and EEG monitors requiring low noise and low power. IC Role / Device Role / Timing Role: Precision ADC digitizes conditioned biopotential signals with 91.5 dB SNR and minimal harmonic distortion. Use Value: 91.5 dB SNR at 1 kHz supports >15.5 ENOB for clinical-grade signal fidelity; VQFN package enables compact wearable form factors. |
| Transducer Interface Module | Automated Test Equipment (ATE) |
|
Use Scenario: Signal conditioning and digitization of strain gauge, RTD, and thermocouple outputs in modular sensor hubs. IC Role / Device Role / Timing Role: Unipolar 4-channel mux accepts differential or single-ended transducer outputs referenced to COM. Use Value: On-chip mux + 16-bit resolution eliminates need for external precision op-amps and multiplexers-reducing BOM and layout area. |
Use Scenario: Multi-channel voltage/current measurement in benchtop ATE systems requiring fast settling and repeatable accuracy. IC Role / Device Role / Timing Role: 500-kSPS throughput with global CONVST enables parallel sampling across multiple ADCs for time-aligned test vectors. Use Value: Daisy-chain mode reduces digital interconnect count by 50% vs discrete SPI buses-improving signal integrity and test repeatability. |
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 |
|---|---|---|---|
| ADS8327IRHBT | 8-channel, 16-bit, 500 kSPS SAR ADC in 32-pin QFN; lacks on-chip conversion clock and daisy-chain mode. | Higher channel count but requires external clock and separate CS lines per device-less suitable for tightly synchronized multi-ADC systems. | Select ADS8327IRHBT only when >4 channels are required and board space allows larger 5 mm × 5 mm QFN package. |
| AD7682BCPZ-RL7 | 4-channel, 16-bit, 250 kSPS SAR ADC; uses SPI-only interface, no DSP frame-sync mode; 100 kSPS minimum throughput in sequencer mode. | Lower maximum sampling rate and no global CONVST-limits use in high-speed transient capture or synchronized multi-device acquisition. | Choose AD7682BCPZ-RL7 if system prioritizes ultra-low noise (92.5 dB SNR) over speed and requires industry-standard SPI compatibility without DSP legacy support. |
Compared with ADS8331IRGET, ADS8327IRHBT offers more channels but sacrifices integration (no CCLK, no daisy-chain), while AD7682BCPZ-RL7 trades speed for lower noise and simpler SPI implementation-making ADS8331IRGET optimal for compact, synchronized, low-power 4-channel DAQ designs.
Availability
ADS8331IRGET is available at Aetrix Electronics and suitable for industrial process controls, medical diagnostic equipment, and transducer interface modules requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for ADS8331IRGET 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 ADS8331IRGET belongs to TI's low-power, high-speed SAR ADC family designed specifically for space-constrained, battery-aware, and multi-sensor industrial and medical data acquisition systems operating across –40°C to +85°C.
FAQ
What is the maximum sampling rate supported by the ADS8331IRGET?
The ADS8331IRGET supports a maximum sampling rate of 500 kSPS under specified conditions (VA = 2.7 V to 5.5 V, VBD ≥ 1.65 V). This rate is achievable with either internal or external conversion clocking and is maintained across the full industrial temperature range (–40°C to +85°C). At 500 kSPS, the device delivers 16-bit resolution with ±1.2 LSB typical INL and 91.5 dB SNR at 1 kHz when powered at 5 V with 4.096 V reference.
Does the ADS8331IRGET require an external reference voltage?
Yes, the ADS8331IRGET requires an external reference voltage applied between REF+ and REF– pins. It supports unipolar reference ranges from 1.2 V to 4.096 V (up to VA), with typical configurations using 2.5 V (at 2.7 V VA) or 4.096 V (at 5 V VA). The device does not include an internal reference; REF– must be connected to AGND via a dedicated PCB via to ensure optimal PSRR and noise rejection.
Can the ADS8331IRGET operate with different analog and digital supply voltages?
Yes, the ADS8331IRGET supports independent analog (VA) and digital I/O (VBD) supplies. VA ranges from 2.7 V to 5.5 V for the analog core, while VBD ranges from 1.65 V to VA + 0.2 V for the digital interface. This allows direct interfacing with 1.8 V or 3.3 V microcontrollers while maintaining full analog performance-enabling mixed-voltage system designs without level shifters.
How does the daisy-chain mode work on the ADS8331IRGET?
Daisy-chain mode on the ADS8331IRGET uses the EOC/INT/CDI pin as a chain data input (CDI) to cascade serial data between multiple devices. In this configuration, SDO of one ADS8331IRGET connects to SDI of the next, with shared SCLK and FS/CS lines. The first device's EOC/INT/CDI remains configured as EOC/INT, while subsequent devices configure it as CDI-enabling single-frame readout of all converters' data with minimal MCU GPIO usage.
What power-saving modes are available on the ADS8331IRGET?
The ADS8331IRGET provides three power-saving modes: Deep Powerdown (50–250 nA), Nap (325–500 µA), and Auto-NAP (8.7 mW at 250 kSPS). Deep PD halts all internal clocks and resets logic; Nap retains register state but disables conversion circuitry; Auto-NAP automatically enters Nap between conversions at ≤250 kSPS. All modes are controlled via SPI command or hardware RESET, with wake-up time <1 µs from Nap and <10 µs from Deep PD.
ADS8331IRGET Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 24-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 500k
- Number of Inputs:
- 4
- Input Type:
- Pseudo-Differential, Single Ended
- Data Interface:
- SPI
- Configuration:
- MUX-S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External
- Voltage - Supply, Analog:
- 2.7V ~ 3.6V, 5V
- Voltage - Supply, Digital:
- 1.65V ~ 5.5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 24-VQFN (4x4)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS8331IRGET FAQ
1.How can I place an order for ADS8331IRGET through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS8331IRGET 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 ADS8331IRGET reliable?
The price and inventory of ADS8331IRGET are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS8331IRGET is usually 5 days.
3.What payment methods are accepted for ADS8331IRGET?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS8331IRGET transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS8331IRGET?
ADS8331IRGET orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS8331IRGET 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 ADS8331IRGET?
For technical support, including ADS8331IRGET datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS8331IRGET requirements.
6.How does Aetrix verify that ADS8331IRGET is sourced from the original manufacturer or authorized distributors?
All ADS8331IRGET 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 ADS8331IRGET meets industry standards.
7.What is the process for return or replacement of ADS8331IRGET?
All ADS8331IRGET units undergo pre-shipment inspection (PSI). If there is an issue with ADS8331IRGET, 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 ADS8331IRGET part is unused and in its original packaging.
Return procedure for ADS8331IRGET:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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