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Texas Instruments ADS8331IBRGER
- Part No.:
- ADS8331IBRGER
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-VFQFN Exposed Pad
- Datasheet:
-
ADS8331IBRGER.pdf
- Description:
- IC ADC 16BIT SAR 24VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,910
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Product details
Overview
ADS8331IBRGER 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, delivers ±1.2 LSB typical INL at 2.7 V, and supports daisy-chain operation in data acquisition systems requiring high DC accuracy and flexible channel sequencing.
For engineers reviewing the ADS8331IBRGER datasheet, ADS8331IBRGER pinout, ADS8331IBRGER application, or ADS8331IBRGER equivalent, key selection considerations include its 4-channel mux architecture, 24-pin VQFN (4 mm × 4 mm) package, industrial temperature range (–40°C to +85°C), and support for auto/manual trigger modes with programmable EOC/INT polarity - all critical for transducer interface and medical instrument designs.
Technical Context
The ADS8331IBRGER implements a capacitor-based SAR ADC core with inherent sample-and-hold, enabling single-cycle acquisition and 18-conversion-clock conversion time. Its analog front-end includes a breakout-capable 4:1 multiplexer with COM input, allowing differential or pseudo-differential configurations relative to AGND.
Digital control is executed via a CMOS-compatible SPI interface supporting up to 40 MHz SCLK (at 5 V), with configurable frame sync (FS/CS), conversion start (CONVST), and status output (EOC/INT/CDI) that doubles as chain data input in daisy-chain mode. Power management includes Deep PD, Nap, and Auto-NAP modes with sub-μA quiescent current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - guarantees monotonic output and no missing codes over full industrial temperature range. |
| Sampling Rate | 500 kSPS - enables real-time capture of signals up to ~250 kHz Nyquist bandwidth with adequate oversampling headroom. |
| INL (Typical) | ±1.2 LSB at VA = 2.7 V - ensures <0.002% full-scale linearity error for precision sensor digitization. |
| SNR (Typical) | 91.5 dB at fIN = 1 kHz, VA = 5 V - supports >15 effective bits of dynamic resolution in clean signal environments. |
| Analog Supply | 2.7 V to 5.5 V - allows direct interfacing with low-voltage microcontrollers and battery-powered systems without level-shifting. |
| Digital I/O Supply | 1.65 V to VA - enables interoperability with 1.8 V, 2.5 V, or 3.3 V logic families while maintaining timing integrity. |
| Package | VQFN-24 (4 mm × 4 mm) - provides compact footprint and thermal pad for reliable heat dissipation in space-constrained PCBs. |
Pinout & Package
ADS8331IBRGER is housed in a 24-pin VQFN package (RGE) with 4.00 mm × 4.00 mm body size and exposed thermal pad on the bottom side, which must be connected to analog ground for optimal thermal and noise performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN[0:3] | Multiplexer analog inputs | Four dedicated unipolar input channels; selected individually or sequentially via control register or hardware trigger. |
| ADCIN | ADC conversion input | Output of internal mux; connects to SAR core's sampling capacitor array for digitization. |
| MUXOUT | Mux output node | Accessible for external buffering or diagnostic probing; tied to ADCIN internally during conversion. |
| COM | Common-mode reference | Single-ended reference point for all INx inputs; typically tied to AGND but supports offset biasing. |
| REF+, REF− | External reference terminals | Accept 1.2 V to 4.096 V unipolar reference; REF− must be routed separately to AGND via individual via. |
| CONVST | Conversion start trigger | Edge-sensitive input that freezes sample-and-hold and initiates conversion independent of CS state. |
| FS/CS | Frame sync / chip select | Active-low SPI frame delimiter; enables daisy-chain synchronization and multi-device readout. |
| SCLK, SDI, SDO | SPI interface signals | Support 4-wire SPI with MSB-first straight-binary output; SDO is 3-state controlled by CS. |
| EOC/INT/CDI | Status & chaining terminal | Configurable as end-of-conversion flag, interrupt output, or daisy-chain data input - reduces pin count in multi-ADC systems. |
| VA, VBD | Analog & digital supplies | Separate rails allow optimized noise isolation: VA powers analog core, VBD powers digital interface. |
| AGND, DGND | Analog & digital grounds | Must be connected at single point near device; DGND referenced to VBD, AGND to VA and REF−. |
| RESET | Hardware reset input | Active-low asynchronous reset that clears internal registers and forces device into known power-on state. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip 4-channel mux with breakout | Enables flexible signal routing without external analog switches; each INx accessible independently for calibration or diagnostics. |
| Programmable EOC/INT polarity | Allows alignment with host processor's interrupt polarity requirements without external inverters or firmware workarounds. |
| Daisy-chain mode support | Permits cascading multiple ADS8331IBRGER devices on shared SCLK/SDI lines using single CS, reducing GPIO usage and PCB trace count. |
| Auto-NAP powerdown mode | Automatically enters low-power Nap state between conversions at ≤250 kSPS, cutting total supply current to 8.7 mW at 2.7 V. |
| Global CONVST independent of CS | Supports synchronized sampling across multiple converters even when CS is deasserted, essential for phase-coherent multi-channel acquisition. |
Applications
| Transducer Interface | Medical Instrumentation |
|---|---|
Use Scenario: Digitizing outputs from strain gauges, RTDs, or pressure sensors in portable field equipment with limited power budget. IC Role / Device Role / Timing Role: ADC front-end with integrated mux and low-noise SAR core; handles ratiometric measurements against stable external reference. Use Value: ±1.2 LSB INL and 91.5 dB SNR ensure sub-0.01% measurement accuracy over temperature, critical for Class II medical compliance. | Use Scenario: High-fidelity acquisition of ECG, EEG, or bioimpedance waveforms in bedside monitors or wearable diagnostics. IC Role / Device Role / Timing Role: Precision analog front-end with 500-kSPS throughput and programmable trigger timing for artifact-free sampling. Use Value: Auto-trigger mode with 3-CCLK acquisition time minimizes aperture jitter, preserving waveform fidelity at clinical-grade SNR levels. |
| Industrial Process Control | Data Acquisition Systems |
Use Scenario: Monitoring multi-point temperature, flow, or level sensors in PLC I/O modules operating in harsh factory environments. IC Role / Device Role / Timing Role: Rugged 16-bit ADC with –40°C to +85°C rating, PSRR of 78 dB, and robust ESD protection (±2000 V HBM). Use Value: On-chip mux eliminates need for external multiplexers and associated layout complexity, reducing BOM cost and board area by >30%. | Use Scenario: Modular DAQ cards for test benches requiring scalable channel count, daisy-chain expandability, and deterministic latency. IC Role / Device Role / Timing Role: Synchronized sampling node with global CONVST and daisy-chain capability for coherent multi-board acquisition. Use Value: EOC/INT/CDI pin reconfiguration enables unified interrupt signaling and data streaming across 8+ channels without FPGA glue logic. |
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 |
|---|---|---|---|
| ADS8332IBRGER | 8-channel mux instead of 4-channel; identical pinout, timing, and electrical specs except for IN[4:7] functionality. | Required when more than four analog inputs must be sampled without external muxing or additional ADCs. | Select ADS8332IBRGER only if 8-channel density justifies same-footprint upgrade; software register mapping differs slightly. |
| ADS8684IPWR | 16-bit, 500-kSPS, 4-channel SAR ADC with integrated reference and higher 78-dB PSRR; uses TSSOP-28 package. | Better suited for systems requiring self-contained reference and tighter supply rejection, but larger footprint and no daisy-chain support. | Choose ADS8684IPWR when reference stability and supply immunity outweigh daisy-chain flexibility and VQFN size constraints. |
Compared with ADS8332IBRGER and ADS8684IPWR, the ADS8331IBRGER offers optimal balance of compact VQFN packaging, daisy-chain scalability, and proven 4-channel transducer interface performance - making it preferred for space-limited, multi-node DAQ architectures where pin compatibility and firmware reuse matter.
Availability
ADS8331IBRGER is available at Aetrix Electronics and suitable for communications infrastructure, transducer interfaces, and medical instrumentation requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for ADS8331IBRGER 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 IC design.
The ADS8331IBRGER belongs to TI's low-power, high-speed SAR ADC family engineered for precision measurement in resource-constrained systems - emphasizing low power, small footprint, and flexible digital interfacing for sensor and control applications.
FAQ
What is the maximum sampling rate supported by the ADS8331IBRGER?
The ADS8331IBRGER supports a maximum sampling rate of 500 kSPS under specified conditions (VA = 5 V, VBD = 5 V, fSCLK ≥ 40 MHz). At this rate, conversion time is fixed at 18 internal CCLK cycles, and acquisition time is 3 CCLK cycles in both manual and auto-trigger modes. The device maintains full 16-bit performance and monotonicity across the entire industrial temperature range.
Does the ADS8331IBRGER require an external reference voltage?
Yes, the ADS8331IBRGER requires an external unipolar reference voltage applied between REF+ and REF− pins. It accepts references from 1.2 V to 4.096 V (up to VA), with typical operation at 2.5 V (for 2.7 V supply) or 4.096 V (for 5 V supply). The reference input impedance is 20 kΩ, and REF− must be connected directly to AGND through a dedicated via to minimize noise coupling.
Can the ADS8331IBRGER operate with different analog and digital supply voltages?
Yes, the ADS8331IBRGER 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 for the digital interface. This separation allows interfacing with 1.8 V or 2.5 V microcontrollers while powering the SAR core from a cleaner 3.3 V or 5 V rail - improving noise immunity and system-level power efficiency.
How does daisy-chain mode function on the ADS8331IBRGER?
In daisy-chain mode, the ADS8331IBRGER uses the EOC/INT/CDI pin as a chain data input (CDI), accepting serial data from the previous device's SDO output. Multiple ADS8331IBRGER units share SCLK and SDI lines, with a single CS controlling frame timing. Data from all devices appears sequentially on the master SDO line, enabling synchronized multi-ADC readout without additional GPIOs or address decoding logic.
What power-saving modes are available on the ADS8331IBRGER?
The ADS8331IBRGER offers three power-saving modes: Deep PD (250 nA standby current), Nap (325–500 μA), and Auto-NAP (automatically entered between conversions at ≤250 kSPS). Auto-NAP reduces average power to 8.7 mW at 2.7 V, while Deep PD enables ultra-low-power wake-on-CONVST operation in battery-critical applications such as portable sensors or IoT edge nodes.
ADS8331IBRGER 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:
- -
ADS8331IBRGER FAQ
1.How can I place an order for ADS8331IBRGER through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS8331IBRGER 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 ADS8331IBRGER reliable?
The price and inventory of ADS8331IBRGER are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS8331IBRGER is usually 5 days.
3.What payment methods are accepted for ADS8331IBRGER?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS8331IBRGER transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS8331IBRGER?
ADS8331IBRGER orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS8331IBRGER 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 ADS8331IBRGER?
For technical support, including ADS8331IBRGER datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS8331IBRGER requirements.
6.How does Aetrix verify that ADS8331IBRGER is sourced from the original manufacturer or authorized distributors?
All ADS8331IBRGER 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 ADS8331IBRGER meets industry standards.
7.What is the process for return or replacement of ADS8331IBRGER?
All ADS8331IBRGER units undergo pre-shipment inspection (PSI). If there is an issue with ADS8331IBRGER, 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 ADS8331IBRGER part is unused and in its original packaging.
Return procedure for ADS8331IBRGER:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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