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Texas Instruments ADS8331IBPWR
- Part No.:
- ADS8331IBPWR
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
ADS8331IBPWR.pdf
- Description:
- IC ADC 16BIT SAR 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,748
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Product details
Overview
ADS8331IBPWR 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 and delivers ±1.2 LSB typical INL, 91.5 dB SNR at 1 kHz, and supports daisy-chain configuration for multi-ADC systems in industrial data acquisition.
For engineers reviewing the ADS8331IBPWR datasheet, ADS8331IBPWR pinout, ADS8331IBPWR application, or ADS8331IBPWR equivalent, key selection criteria include unipolar 4:1 mux input architecture, 24-pin VQFN (4 mm × 4 mm) package, deep powerdown mode (50 nA), programmable EOC/INT polarity, and compatibility with 1.65 V–VA digital I/O supply - all critical for battery-powered sensor nodes and high-channel-density PLC modules.
Technical Context
The ADS8331IBPWR implements a capacitor-based SAR ADC core with inherent sample-and-hold, supporting both manual and auto-triggered conversions via CONVST or global CONVST. Its internal 11 MHz conversion clock eliminates external timing components, while flexible serial interface modes (SPI, DSP frame sync, daisy-chain) enable direct interfacing with TMS320™ DSPs and microcontrollers without glue logic.
It features three powerdown states - Deep (50–250 nA), Nap (325–500 µA), and Auto-NAP (8.7 mW at 250 kSPS) - dynamically controlled by SCLK state and command register settings. The 4-channel mux breakout allows independent routing of IN[0:3] to MUXOUT/ADCIN, with COM referenced to AGND for true unipolar operation up to 2.5 V full-scale.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit SAR with no missing codes over –40°C to 85°C - guarantees monotonicity and full code coverage in precision measurement. |
| Sampling Rate | Up to 500 kSPS - enables real-time capture of signals up to ~17 MHz small-signal bandwidth (INX–COM). |
| DC Accuracy | ±1.2 LSB typical INL, ±0.6 LSB typical DNL at VA = 2.7 V - ensures <0.002% linearity error for 4–20 mA loop calibration. |
| AC Performance | 91.5 dB SNR, 101 dB SFDR at fIN = 1 kHz, VA = 5 V - supports 15.5 ENOB for high-fidelity transducer digitization. |
| 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 instrumentation. |
| Analog Supply Range | 2.7 V to 5.5 V - permits direct operation from single Li-ion or 3.3 V/5 V system rails without LDO overhead. |
| Digital I/O Supply | 1.65 V to VA - enables interoperability with 1.8 V, 2.5 V, or 3.3 V controllers while maintaining signal integrity. |
Pinout & Package
ADS8331IBPWR is housed in a 24-pin VQFN package (4.00 mm × 4.00 mm) with exposed thermal pad connected to AGND. Pin functions are fully specified per TI SBAS363E Rev E.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN0–IN3 | Multiplexer analog inputs | Four unipolar input channels selectable via internal mux; each rated for 0 to VREF input range relative to COM. |
| ADCIN | ADC conversion input | Accepts mux output (MUXOUT) or external signal; 45 pF input capacitance requires careful driver settling design. |
| COM | Common-mode reference | Typically tied to AGND; defines zero point for all INx–COM differential measurements. |
| REF+, REF– | External reference terminals | Support 1.2 V–4.096 V reference span; REF– must connect to AGND via dedicated PCB via to minimize noise coupling. |
| SCLK, SDI, SDO, FS/CS | SPI-compatible serial interface | Full-duplex 4-wire interface; SDO tri-stated when CS high; supports daisy-chain via CDI/EOC pin reconfiguration. |
| CONVST | Conversion start trigger | Edge-sensitive input freezing sample-and-hold; global triggering possible across multiple ADS8331 devices. |
| EOC/INT/CDI | Multi-function status pin | Configurable as end-of-conversion flag, interrupt output, or chain data input - reduces GPIO count in multi-ADC systems. |
| RESET | Asynchronous reset | Active-low input clearing internal registers and returning device to power-on state; required before initial SPI communication. |
| VA, VBD, AGND, DGND | Power and ground supplies | Separate analog/digital supplies isolate noise; VBD independence allows level-shifting between controller and ADC domains. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip conversion clock (CCLK) | 11 MHz internal oscillator eliminates need for external crystal or clock generator - simplifies BOM and layout. |
| Programmable EOC/INT polarity | Register-controlled active-high/active-low assertion enables direct connection to MCU interrupt pins without external inverters. |
| Daisy-chain capability | Single SCLK/SDI/SDO bus controls up to N devices using shared CS and cascaded CDI/EOC - cuts interface wiring by >60% in multi-channel systems. |
| Auto-NAP power management | Automatic entry into low-power Nap mode between conversions at ≤250 kSPS - achieves 8.7 mW average power without firmware intervention. |
| Breakout mux architecture | Independent IN[0:3], MUXOUT, and ADCIN pins allow simultaneous monitoring of multiple sensors and internal signal routing - supports diagnostic self-test paths. |
Applications
| Industrial Process Control | Medical Instrumentation |
|---|---|
Use Scenario: High-density analog input module in programmable logic controller (PLC) acquiring 4–20 mA current loops from pressure, temperature, and flow sensors. IC Role / Device Role / Timing Role: 16-bit SAR ADC with 4-channel mux performs synchronized sampling of field transducers; EOC triggers DMA transfer to ARM Cortex-M7 host. Use Value: ±1.2 LSB INL ensures <0.002% full-scale accuracy across temperature, meeting SIL-2 functional safety requirements for closed-loop control. | Use Scenario: Portable ECG monitor digitizing low-amplitude biopotential signals from electrode arrays with minimal power draw. IC Role / Device Role / Timing Role: Low-noise ADC captures lead-II differential waveforms at 500 kSPS; Deep PD mode (50 nA) extends battery runtime beyond 72 hours. Use Value: 91.5 dB SNR at 1 kHz preserves QRS complex fidelity; separate AGND/DGND planes suppress digital switching noise in mixed-signal PCB layout. |
| Communications Test Equipment | Transducer Interface Module |
Use Scenario: Bit-error-rate tester (BERT) front-end capturing jitter and amplitude modulation on RF power amplifier outputs. IC Role / Device Role / Timing Role: ADC samples baseband I/Q signals post-downconversion; daisy-chained configuration synchronizes 8-channel capture across dual ADS8331 devices. Use Value: 101 dB SFDR rejects harmonic distortion from PA nonlinearities; 40 MHz SCLK support enables fast data streaming to FPGA buffer memory. | Use Scenario: Strain-gauge bridge interface in structural health monitoring node deployed on bridges or wind turbines. IC Role / Device Role / Timing Role: Configured in ratiometric mode with external 2.5 V reference; IN0–IN3 acquire quarter-bridge outputs with COM tied to excitation mid-point. Use Value: 0.003% FSR gain error matching minimizes channel-to-channel offset in multi-sensor fusion algorithms; PSRR of 74 dB suppresses supply ripple from DC-DC converters. |
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 |
|---|---|---|---|
| ADS8332IPWR | 8-channel unipolar mux vs. ADS8331IBPWR's 4-channel; identical AC/DC specs, package, and interface. | Higher channel density required; same PCB footprint but different IN[4:7] routing and software mux addressing. | Select when system needs >4 analog inputs without adding second ADC; no layout change needed due to pin-compatible VQFN package. |
| ADS8327IPWR | 16-bit, 500 kSPS, single-ended input only (no mux); lower power (6.5 mW), smaller 16-pin TSSOP package. | Fixed single-input topology; lacks multiplexing, daisy-chain, and programmable EOC/INT functionality. | Choose for cost-sensitive, space-constrained designs where only one sensor channel is required and interface simplicity is prioritized. |
Compared with ADS8332IPWR, the ADS8331IBPWR offers lower channel count but identical performance and power in the same 4-mm VQFN; versus ADS8327IPWR, it trades off single-input simplicity for integrated 4:1 mux flexibility and multi-device synchronization - critical for scalable sensor array architectures.
Availability
ADS8331IBPWR is available at Aetrix Electronics and suitable for industrial process controls, medical instrumentation, and communications test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ADS8331IBPWR 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and personal electronics markets.
The ADS8331IBPWR belongs to TI's low-power, high-speed SAR ADC family designed specifically for precision data acquisition in space- and power-constrained applications - emphasizing integration, noise immunity, and flexible digital interfacing.
FAQ
What is the maximum SCLK frequency supported by the ADS8331IBPWR?
The ADS8331IBPWR supports up to 40 MHz SCLK when used solely as an I/O clock (VA = VBD = 5 V). When SCLK also serves as the conversion clock, the maximum is 21 MHz. These limits ensure reliable setup/hold timing for SDI and valid SDO data windows as specified in TI SBAS363E Section 8.8.
Does the ADS8331IBPWR require an external reference voltage?
Yes, the ADS8331IBPWR requires an external reference applied between REF+ and REF– pins. It supports reference voltages from 1.2 V to 4.096 V (up to VA), with optimal DC performance achieved using precision references like REF3240. No internal reference is provided.
How does the daisy-chain mode work on the ADS8331IBPWR?
In daisy-chain mode, the SDO of one ADS8331IBPWR connects to the SDI of the next, with shared SCLK and FS/CS. The EOC/INT/CDI pin of downstream devices is configured as CDI to accept chain data. This allows sequential readout of conversion results from multiple devices using a single SPI bus.
What is the purpose of the COM pin on the ADS8331IBPWR?
The COM pin on the ADS8331IBPWR serves as the common-mode reference for all unipolar analog inputs (IN0–IN3). It is typically connected to AGND and defines the zero-volt baseline for INx–COM differential measurements - essential for accurate ratiometric sensing with bridge transducers.
Can the ADS8331IBPWR operate with different analog and digital supply voltages?
Yes, the ADS8331IBPWR supports independent analog (VA = 2.7 V–5.5 V) and digital I/O (VBD = 1.65 V–VA) supplies. This allows interfacing with 1.8 V microcontrollers while running the ADC core at 3.3 V or 5 V - improving noise isolation and enabling mixed-voltage system designs.
ADS8331IBPWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 24-TSSOP (0.173", 4.40mm Width)
- 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-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS8331IBPWR FAQ
1.How can I place an order for ADS8331IBPWR through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS8331IBPWR 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 ADS8331IBPWR reliable?
The price and inventory of ADS8331IBPWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS8331IBPWR is usually 5 days.
3.What payment methods are accepted for ADS8331IBPWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS8331IBPWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS8331IBPWR?
ADS8331IBPWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS8331IBPWR 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 ADS8331IBPWR?
For technical support, including ADS8331IBPWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS8331IBPWR requirements.
6.How does Aetrix verify that ADS8331IBPWR is sourced from the original manufacturer or authorized distributors?
All ADS8331IBPWR 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 ADS8331IBPWR meets industry standards.
7.What is the process for return or replacement of ADS8331IBPWR?
All ADS8331IBPWR units undergo pre-shipment inspection (PSI). If there is an issue with ADS8331IBPWR, 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 ADS8331IBPWR part is unused and in its original packaging.
Return procedure for ADS8331IBPWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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