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Texas Instruments ADC08831IWM/NOPB
- Part No.:
- ADC08831IWM/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 14-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
ADC08831IWM/NOPB.pdf
- Description:
- IC ADC 8BIT SAR 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,611
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Product details
Overview
ADC08831IWM/NOPB from Texas Instruments is an 8-bit successive-approximation analog-to-digital converter with integrated 2-channel analog multiplexer, track/hold function, and 3-wire serial MICROWIRE-compatible interface. It operates from a single 5V supply, delivers ±1 LSB total unadjusted error, achieves 4μs max conversion time at 2MHz clock, and supports single-ended or pseudo-differential input configurations for sensor digitization in embedded systems.
For engineers reviewing the ADC08831IWM/NOPB datasheet, ADC08831IWM/NOPB pinout, ADC08831IWM/NOPB application, or ADC08831IWM/NOPB equivalent, key selection criteria include its 8-pin VSSOP package, 2-channel software-configurable MUX, no zero/full-scale adjustment requirement, TTL/CMOS I/O compatibility, and low-power mode (3.0mW typical) activated by CS high.
Technical Context
The ADC08831IWM/NOPB implements a successive-approximation register (SAR) architecture with an on-chip sample-and-hold circuit that acquires the analog input during the conversion cycle. Its analog front-end includes a 300Ω series resistance and 13pF sampling capacitor per input, requiring careful source impedance management to ensure full 8-bit accuracy.
Digital control uses a 3-wire serial interface (CS, CLK, DI/DO) compliant with MICROWIRE timing, supporting MSB-first data output only. The device lacks MUX addressing logic - unlike the ADC08832 - and provides fixed polarity differential operation between IN+ and IN−, with conversion initiated by CS low and completed in exactly 8 clock cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8 bits - delivers 256 discrete digital codes over full-scale input range |
| Conversion Time | 4 μs max at 2 MHz clock - enables up to 181 ksps sampling rate in continuous operation |
| Total Unadjusted Error | ±1 LSB max - guarantees monotonic transfer function with no missing codes over −40°C to +85°C |
| Supply Voltage | 4.5 V to 6.0 V - compatible with standard 5V logic rails and tolerant of ±10% variation |
| Power Dissipation | 8.5 mW typical active, 3.0 mW typical low-power mode - reduces thermal load in space-constrained designs |
| Analog Input Range | GND to VCC - supports ratiometric measurement when VREF = VCC, with ±50 mV overvoltage tolerance |
| Reference Input | External VREF pin - allows flexible scaling (e.g., 2.5V reference for 0–2.5V input span) without internal dependency |
Pinout & Package
ADC08831IWM/NOPB is housed in an 8-pin VSSOP (DGK) package - 2.3 mm × 2.0 mm footprint, 0.5 mm pitch - optimized for high-density PCB layouts and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN+ | Positive analog input | Accepts voltage relative to IN− in differential mode; used as single-ended input when IN− = GND |
| IN− | Negative analog input | Reference node for differential measurement; tied to GND for single-ended operation |
| VREF | Reference voltage input | Sets full-scale range (VIN(max) − VIN(min)) = VREF; must drive ≥2.8 kΩ load |
| VCC | Positive supply | Provides power for analog and digital circuits; also serves as reference source if externally tied to VREF |
| GND | Analog/digital ground | Common return path for all signals; requires low-impedance connection to system ground plane |
| CS | Chip select input | Active-low enable: low = conversion active and DO enabled; high = low-power mode, DO in TRI-STATE |
| CLK | Serial clock input | Drives internal timing; accepts 10 kHz–2 MHz square wave with 40–60% duty cycle |
| DI/DO | Serial data I/O | Input-only during MUX setup (not applicable to ADC08831); output-only during conversion (MSB first) |
Key Features
| Feature | Design Value |
|---|---|
| Integrated track/hold | Acquires analog signal during conversion without external components, enabling accurate sampling of dynamic inputs |
| Software-configurable input modes | Supports single-ended, differential, and pseudo-differential configurations via external wiring - no firmware overhead |
| No calibration required | Guaranteed ±1 LSB TUE and monotonicity eliminate factory or field trimming, reducing BOM and test cost |
| MICROWIRE-compatible serial interface | 3-wire protocol minimizes PCB routing, avoids parallel bus noise coupling, and interfaces directly with COPS microcontrollers |
| Low-power standby mode | Reduces supply current to ~0.6 mA (1.0 mA max) when CS = high, extending battery life in portable instrumentation |
Applications
| Remote Sensor Digitization | Industrial Process Monitoring |
|---|---|
|
Use Scenario: Converting thermistor, RTD, or pressure transducer outputs located meters from the controller in factory-floor environments. IC Role / Device Role / Timing Role: ADC08831IWM/NOPB acts as local analog front-end, performing digitization at the sensor node before transmitting noise-immune serial data over twisted-pair wiring. Use Value: Eliminates analog signal degradation over long traces; 8-bit resolution suffices for 0.5% accuracy temperature or pressure readings. |
Use Scenario: Sampling multiple analog process variables (e.g., flow, level, pH) in PLC-based control cabinets with limited board space. IC Role / Device Role / Timing Role: ADC08831IWM/NOPB serves as compact, multi-channel acquisition unit - its 2-channel MUX reduces component count versus discrete single-channel ADCs. Use Value: Enables dual-sensor monitoring per IC with shared clock and serial bus, cutting interconnect complexity and layout area by 40% vs. two separate 8-pin ADCs. |
| Embedded System Data Acquisition | Noise-Resilient Instrumentation |
|
Use Scenario: Adding analog sensing capability to resource-constrained microcontroller-based devices (e.g., smart HVAC controllers, portable meters). IC Role / Device Role / Timing Role: ADC08831IWM/NOPB functions as a serial peripheral - interfacing via GPIO bit-banging or hardware SPI, freeing MCU pins and simplifying firmware. Use Value: 3-wire interface consumes only 3 MCU I/Os; no external reference or op-amp needed for basic ratiometric measurements using VCC as VREF. |
Use Scenario: Measuring small-signal transducers (e.g., strain gauges, piezoelectric sensors) in electrically noisy industrial settings. IC Role / Device Role / Timing Role: ADC08831IWM/NOPB performs pseudo-differential acquisition - rejecting common-mode noise while maintaining single-ended simplicity. Use Value: Built-in 300Ω/13pF input network and fast 4μs conversion limit aliasing; ±50 mV overvoltage tolerance prevents latch-up near rail boundaries. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit serial ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADC0831LCN/NOPB | Same pinout and core architecture; lacks VSSOP option (SOIC only), higher 125°C max junction temp rating | Preferred for high-temp industrial environments where extended thermal range is critical | Select ADC0831LCN/NOPB when SOIC-8 packaging and >85°C operation are required; not drop-in for VSSOP footprints |
| ADS7822U | 8-bit SAR ADC with SPI interface, 200 ksps max, 2.7–5.25V supply, integrated reference, smaller 8-pin VSSOP | Better suited for battery-powered systems needing wider supply range and lower quiescent current (1.2 mW active) | Choose ADS7822U for modern low-voltage designs; ADC08831IWM/NOPB remains optimal for legacy 5V MICROWIRE ecosystems |
Compared with ADC0831LCN/NOPB and ADS7822U, the ADC08831IWM/NOPB offers guaranteed no-missing-codes performance and superior noise immunity in 60 Hz–dominated environments due to its fixed 2-channel differential topology and proven EMI-hardened layout guidance - making it preferred for retrofitting into existing 5V industrial sensor nodes.
Availability
ADC08831IWM/NOPB is available at Aetrix Electronics and suitable for remote sensor digitization, industrial process monitoring, and embedded system data acquisition requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for ADC08831IWM/NOPB 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, embedded processing, and connectivity technologies, with decades of expertise in precision data converters and industrial-grade signal chain solutions.
The ADC08831IWM/NOPB belongs to TI's legacy precision SAR ADC family, designed specifically for cost-sensitive, noise-resilient, 8-bit acquisition in industrial and embedded applications where reliability, ease of use, and minimal external components are prioritized.
FAQ
What is the maximum clock frequency supported by ADC08831IWM/NOPB?
The ADC08831IWM/NOPB supports a maximum clock frequency of 2 MHz, as specified in its operating ratings. At this frequency, conversion completes in 4 μs (max), enabling up to 181 ksps sampling. Operation below 10 kHz is not recommended, as timing margins degrade and acquisition time becomes non-deterministic. Clock duty cycle must remain between 40% and 60% for reliable operation.
Does ADC08831IWM/NOPB require external zero or full-scale calibration?
No, the ADC08831IWM/NOPB requires no zero or full-scale adjustment. Its design guarantees ±1 LSB total unadjusted error and monotonicity across −40°C to +85°C, eliminating factory trimming or field calibration. Offset and full-scale errors are bounded per datasheet specifications, and the absence of missing codes ensures predictable digital output behavior under all valid operating conditions.
Can ADC08831IWM/NOPB operate with a 3.3V supply?
No, ADC08831IWM/NOPB is not rated for 3.3V operation. Its absolute maximum supply voltage is 6.5V, but the minimum operating voltage is 4.5V per the datasheet's Operating Ratings. At 3.3V, internal biasing fails, reference ladder operation becomes unstable, and digital I/O thresholds (VIH = 2.0V min, VIL = 0.8V max) cannot be reliably met - resulting in undefined conversion behavior and potential data corruption.
What is the purpose of the VREF pin on ADC08831IWM/NOPB?
The VREF pin on ADC08831IWM/NOPB sets the full-scale analog input range: VIN(max) − VIN(min) = VREF. It connects to the top of an internal resistor ladder and capacitor array used in the SAR conversion process. Unlike the ADC08832, the ADC08831IWM/NOPB does not tie VREF internally to VCC, allowing flexible scaling - e.g., 2.5V reference for 0–2.5V input spans - while maintaining 8-bit resolution and linearity.
How does the low-power mode function on ADC08831IWM/NOPB?
ADC08831IWM/NOPB enters low-power mode when the CS pin is held high. In this state, analog circuitry and digital logic enter static current modes, reducing typical supply current to 0.6 mA (1.0 mA max) and power dissipation to 3.0 mW. The DO pin transitions to TRI-STATE, and the internal reference remains active - so external VREF sources continue drawing current unless separately gated. Digital inputs (CLK, DI) must be driven to VCC or GND to avoid static CMOS leakage.
ADC08831IWM/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Number of Bits:
- 8
- Sampling Rate (Per Second):
- 250k
- Number of Inputs:
- 1
- Input Type:
- Differential, Pseudo-Differential, Single Ended
- Data Interface:
- SPI, DSP
- 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:
- 4.5V ~ 6V
- Voltage - Supply, Digital:
- 4.5V ~ 6V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 14-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADC08831IWM/NOPB FAQ
1.How can I place an order for ADC08831IWM/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for ADC08831IWM/NOPB 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 ADC08831IWM/NOPB reliable?
The price and inventory of ADC08831IWM/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADC08831IWM/NOPB is usually 5 days.
3.What payment methods are accepted for ADC08831IWM/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADC08831IWM/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADC08831IWM/NOPB?
ADC08831IWM/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADC08831IWM/NOPB 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 ADC08831IWM/NOPB?
For technical support, including ADC08831IWM/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADC08831IWM/NOPB requirements.
6.How does Aetrix verify that ADC08831IWM/NOPB is sourced from the original manufacturer or authorized distributors?
All ADC08831IWM/NOPB 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 ADC08831IWM/NOPB meets industry standards.
7.What is the process for return or replacement of ADC08831IWM/NOPB?
All ADC08831IWM/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with ADC08831IWM/NOPB, 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 ADC08831IWM/NOPB part is unused and in its original packaging.
Return procedure for ADC08831IWM/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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