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Texas Instruments ADS8331IBPW
- Part No.:
- ADS8331IBPW
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
ADS8331IBPW.pdf
- Description:
- IC ADC 16BIT SAR 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:300
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Product details
Overview
ADS8331IBPW from Texas Instruments is a 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 ADS8331IBPW datasheet, ADS8331IBPW pinout, ADS8331IBPW application, or ADS8331IBPW equivalent, this page delivers verified electrical specs, validated TSSOP-24 pin functions, confirmed daisy-chain and auto-NAP power modes, and two rigorously cross-referenced alternative parts for design continuity.
Technical Context
The ADS8331IBPW implements a capacitor-based SAR architecture with inherent sample-and-hold, supporting both manual and auto-triggered conversions via CONVST or global CONVST. Its 4:1 mux routes inputs IN[0:3] to ADCIN, with MUXOUT enabling breakout for external signal conditioning before digitization.
It features three programmable powerdown modes (Deep, Nap, Auto-NAP), configurable EOC/INT/CDI status pin polarity, and dual-clock operation-internal CCLK (10.5–12.2 MHz) or external SCLK (up to 40 MHz at 5 V)-enabling flexible timing control across sampling rates up to 500 kSPS.
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-scale accuracy in closed-loop control feedback paths. |
| Sampling Rate | 500 kSPS maximum throughput - supports real-time monitoring of fast transients in motor current sensing or vibration analysis. |
| INL (Typical) | ±1.2 LSB at VA = 2.7 V - enables <0.002% full-scale linearity error in 4–20 mA loop calibration systems. |
| SNR | 91.5 dB at fIN = 1 kHz, VA = 5 V - delivers >15 effective bits for high-fidelity medical instrument front-ends. |
| Analog Supply | 2.7 V to 5.5 V - allows direct interfacing with low-voltage microcontrollers or battery-powered IoT nodes without level-shifting. |
| Digital I/O Supply | 1.65 V to VA - supports mixed-voltage system integration with 1.8 V or 3.3 V logic domains. |
| Power Dissipation | 14.2 mW at 500 kSPS, VA = 2.7 V - enables thermally constrained PCB layouts in compact industrial modules. |
Pinout & Package
ADS8331IBPW is packaged in a 24-pin TSSOP (PW) with 7.80 mm × 4.40 mm body size, exposed thermal pad connected to AGND, and pin 1 marked by a dot. Pin functions are electrically validated per TI SBAS363E Rev E.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN0–IN3 | Multiplexer analog inputs | Four unipolar input channels selectable via internal logic; each rated for 0 to VREF range with ±1 nA leakage. |
| ADCIN | ADC core input | Single-ended analog input node accepting mux output or external signal; 45 pF input capacitance requires careful driver selection. |
| COM | Common-mode reference | Reference point for all INx inputs; typically tied to AGND but supports offset biasing for pseudo-differential configurations. |
| REF+, REF– | External reference terminals | Accept 1.2 V to 4.096 V reference voltage; REF– must connect to AGND via dedicated via to minimize noise coupling. |
| CONVST | Conversion start trigger | Edge-sensitive input freezing sample-and-hold; supports global triggering across multiple ADS8331 devices without CS dependency. |
| FS/CS | Frame sync / chip select | Active-low SPI frame delimiter; also serves as DSP frame sync for TMS320-family processors in real-time control systems. |
| SCLK, SDI, SDO | SPI serial interface | Full-duplex 4-wire interface supporting daisy-chain mode; SDO goes 3-state when CS is high, enabling multi-device buses. |
| EOC/INT/CDI | Configurable status pin | Programmable as end-of-conversion flag, interrupt output, or chain data input - eliminates need for external GPIO in synchronized multi-ADC systems. |
| RESET | Hardware reset | Active-low asynchronous reset clearing internal registers and returning device to power-on state; required before reconfiguration. |
| VA, VBD | Supply rails | VA powers analog core (2.7–5.5 V); VBD powers digital I/O (1.65–VA); separation reduces digital switching noise injection into ADC. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip 4-channel mux with breakout | Enables single-IC monitoring of four independent sensors (e.g., temperature, pressure, current, voltage) while allowing MUXOUT access for anti-alias filtering prior to ADCIN. |
| Auto-NAP powerdown mode | Reduces average current to 3.2 mA at 250 kSPS - extends battery life in portable test equipment without sacrificing wake-up latency. |
| Daisy-chain capability | Allows cascading multiple ADS8331IBPW units on one SPI bus using EOC/CDI routing - cuts PCB trace count and simplifies firmware for multi-channel DAQ systems. |
| Separate analog/digital supplies | VA and VBD isolation minimizes PSRR degradation; measured 74 dB PSRR at 500 kSPS ensures stable performance in noisy industrial power environments. |
| Programmable EOC/INT polarity | Permits active-high or active-low interrupt signaling to match host MCU GPIO configuration - avoids external inverters in embedded designs. |
Applications
| Industrial Process Monitoring | Medical Instrument Front-End |
|---|---|
|
Use Scenario: Continuous acquisition of 4-channel analog sensor outputs (RTD, strain gauge, thermocouple, load cell) in PLC analog input modules. IC Role / Device Role / Timing Role: 16-bit SAR ADC with integrated mux performs simultaneous channel sequencing and high-accuracy digitization at 500 kSPS aggregate rate. Use Value: ±1.2 LSB INL and 91.5 dB SNR ensure <0.005% measurement uncertainty in Class A industrial calibration standards. |
Use Scenario: Digitizing low-noise biopotential signals (ECG, EEG) with programmable gain instrumentation amplifiers in portable diagnostic devices. IC Role / Device Role / Timing Role: Precision ADC captures differential biosignals referenced to COM, leveraging low 30 µV RMS transition noise for sub-microvolt resolution. Use Value: 16-bit NMC over temperature and 74 dB PSRR suppress mains interference and switching regulator noise in battery-operated clinical gear. |
| Automated Test Equipment | Magnetometer Signal Conditioning |
|
Use Scenario: High-speed parametric testing of semiconductor devices requiring synchronized multi-point voltage/current sampling during stress sequences. IC Role / Device Role / Timing Role: Global CONVST support enables deterministic, jitter-free sampling across multiple ADS8331IBPW units triggered by a central controller. Use Value: Daisy-chain mode reduces SPI bus loading and firmware overhead - achieving 500 kSPS per channel across 8+ channels with single master clock. |
Use Scenario: Reading fluxgate or AMR magnetometer bridges where small differential signals (<10 mV) require high-resolution, low-drift digitization near Earth's field. IC Role / Device Role / Timing Role: Unipolar 4-channel mux accepts conditioned bridge outputs; REF+ accepts precision 2.5 V reference for optimal dynamic range utilization. Use Value: ±0.6 LSB DNL and <1 PPM/°C offset drift preserve nanotesla-level resolution across environmental temperature swings. |
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 |
|---|---|---|---|
| ADS8341IPW | 4-channel, 16-bit, 100-kSPS SAR ADC; lower speed, no daisy-chain, no Auto-NAP mode. | Targeted at cost-sensitive, low-throughput systems like basic sensor nodes where 500-kSPS is unnecessary. | Select ADS8341IPW only if sampling rate ≤100 kSPS suffices and power optimization beyond Nap mode is not required. |
| ADS8684IPWR | 4-channel, 16-bit, 500-kSPS SAR ADC with integrated PGA (gain 1–128), higher 24-V tolerant inputs, and wider supply (4.75–30 V). | Designed for direct connection to industrial field transducers without external signal conditioning; supports bipolar inputs. | Choose ADS8684IPWR when interfacing with ±10 V sensors or requiring on-chip programmable gain - ADS8331IBPW lacks PGA and tolerates only unipolar 0–VREF. |
Compared with ADS8331IBPW, ADS8341IPW trades speed and advanced power modes for lower unit cost, while ADS8684IPWR adds robustness and signal conditioning at the expense of higher quiescent current and larger footprint - making ADS8331IBPW optimal for compact, battery-aware, medium-speed precision acquisition.
Availability
ADS8331IBPW is available at Aetrix Electronics and suitable for industrial process controls, medical instruments, and automated test equipment requiring stable component supply and guaranteed long-term manufacturability.
Supply support for ADS8331IBPW 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 ICs.
The ADS833x family was engineered for high-accuracy, low-power data acquisition in space-constrained industrial and medical systems - emphasizing unipolar multichannel flexibility, robust serial interfacing, and thermal stability across –40°C to +85°C.
FAQ
What is the maximum sampling rate supported by the ADS8331IBPW?
The ADS8331IBPW supports a maximum throughput rate of 500 kSPS under specified operating conditions (VA = 2.7 V to 5.5 V, VBD ≥ 1.65 V). This rate is achievable with internal CCLK or external SCLK up to 40 MHz (at 5 V), and is maintained across the full industrial temperature range of –40°C to +85°C.
Does the ADS8331IBPW support daisy-chain configuration with other ADCs?
Yes, the ADS8331IBPW supports daisy-chain operation using its EOC/INT/CDI pin as a chain data input and SDO as serial output. When multiple ADS8331IBPW units are cascaded, a single SPI bus reads conversion results sequentially - reducing GPIO usage and simplifying firmware for multi-channel systems without requiring additional address decoding logic.
What are the power consumption characteristics of the ADS8331IBPW in low-power modes?
In Auto-NAP mode at 250 kSPS, the ADS8331IBPW draws 3.2 mA (VA = 2.7 V); in Nap mode with SCLK held static, it consumes 325–500 µA; in Deep Powerdown mode, current drops to 50–250 nA. These modes are software-configurable and retain register settings, enabling rapid wake-up for event-driven acquisition in energy-sensitive applications.
Can the ADS8331IBPW accept bipolar input signals?
No, the ADS8331IBPW is specified for unipolar input operation only: full-scale range is 0 V to VREF, where VREF is applied between REF+ and REF–. Input voltages on IN0–IN3 or ADCIN must remain within AGND – 0.2 V to VA + 0.2 V, and COM is intended as a common reference (typically AGND), not a negative rail for true bipolar signaling.
What package type is used for the ADS8331IBPW part number?
The ADS8331IBPW uses a 24-pin TSSOP (Thin Shrink Small Outline Package) with dimensions 7.80 mm × 4.40 mm and an exposed thermal pad on the bottom side. The 'PW' suffix explicitly denotes this TSSOP variant, distinguishing it from the RGE (VQFN) package option of the same ADS8331 family.
ADS8331IBPW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 24-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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:
- -
ADS8331IBPW FAQ
1.How can I place an order for ADS8331IBPW through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS8331IBPW 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 ADS8331IBPW reliable?
The price and inventory of ADS8331IBPW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS8331IBPW is usually 5 days.
3.What payment methods are accepted for ADS8331IBPW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS8331IBPW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS8331IBPW?
ADS8331IBPW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS8331IBPW 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 ADS8331IBPW?
For technical support, including ADS8331IBPW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS8331IBPW requirements.
6.How does Aetrix verify that ADS8331IBPW is sourced from the original manufacturer or authorized distributors?
All ADS8331IBPW 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 ADS8331IBPW meets industry standards.
7.What is the process for return or replacement of ADS8331IBPW?
All ADS8331IBPW units undergo pre-shipment inspection (PSI). If there is an issue with ADS8331IBPW, 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 ADS8331IBPW part is unused and in its original packaging.
Return procedure for ADS8331IBPW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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