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Texas Instruments ADC08831IMX/NOPB
- Part No.:
- ADC08831IMX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADC08831IMX/NOPB.pdf
- Description:
- IC ADC 8BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:422
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Product details
Overview
ADC08831IMX/NOPB from Texas Instruments is an 8-bit successive-approximation analog-to-digital converter with integrated 2-channel analog multiplexer, on-chip sample-and-hold, and 3-wire serial interface (CS, CLK, DI/DO). It operates from a single 5V supply, achieves 4μs max conversion time at 2MHz clock, and delivers ±1LSB total unadjusted error across −40°C to +85°C. It is used in embedded sensor digitization where low pin count and noise-immune serial output are critical.
For engineers reviewing the ADC08831IMX/NOPB datasheet, ADC08831IMX/NOPB pinout, ADC08831IMX/NOPB application, or ADC08831IMX/NOPB equivalent, key selection criteria include its fixed-polarity differential input architecture, MSB-first serial output format, absence of LSB-first mode, VREF pin availability for ratiometric or absolute reference scaling, and compatibility with MICROWIRE-standard controllers.
Technical Context
The ADC08831IMX/NOPB implements a successive-approximation register (SAR) core with a ratioed capacitor array (first 5 bits) and resistor ladder (last 3 bits), paired with a built-in track-and-hold that samples the selected analog input during MUX settling. Its analog front-end presents 300Ω series resistance and 13pF sampling capacitance per input, requiring careful source impedance management to ensure full-scale accuracy.
Digital control uses a 3-wire MICROWIRE-compatible interface: CS initiates conversion, CLK synchronizes data transfer, and DI accepts only a start bit followed by 2-bit MUX address (though ADC08831 has fixed single-ended/differential configuration and ignores MUX bits). DO outputs conversion result MSB-first only-no LSB-first option-and enters TRI-STATE when CS is high.
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 maximum at 2 MHz clock - enables up to 181 ksps sampling rate |
| Total Unadjusted Error | ±1 LSB - guarantees monotonicity and no missing codes across temperature |
| Supply Voltage Range | 4.5 V to 6.0 V - supports standard 5V systems with ±10% tolerance |
| Power Dissipation | 8.5 mW typical at 5V/CS low - drops to 3.0 mW in low-power mode (CS high) |
| Analog Input Range | GND to VCC - allows rail-to-rail input with 50 mV overvoltage tolerance per diode clamp |
| Reference Interface | External VREF pin - enables flexible ratiometric (e.g., tied to VCC) or precision absolute referencing |
Pinout & Package
ADC08831IMX/NOPB is housed in an 8-pin SOIC (D package) or VSSOP (DGK package), both surface-mount, with identical pinout and thermal characteristics (θJA = 235°C/W for SOIC, 122°C/W for VSSOP).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Positive supply | Provides power for analog and digital sections; also serves as default reference when external VREF is omitted |
| GND | Ground reference | Analog and digital common return; must be connected to low-impedance analog ground plane |
| VIN(+) / VIN(−) | Differential analog inputs | Fixed-polarity differential pair: VIN(+) is noninverting, VIN(−) is inverting; supports pseudo-differential and single-ended modes via external biasing |
| VREF | Reference voltage input | Defines full-scale span (VREF/256 per LSB); requires ≥2.8 kΩ drive capability; not internally tied to VCC (unlike ADC08832) |
| CS | Chip select | Active-low initiation signal; holds converter in low-power state when high; must remain low throughout conversion |
| CLK | Serial clock input | Drives internal timing; supports 10 kHz–2 MHz; 40–60% duty cycle required for reliable operation |
| DI | Data input | Accepts start bit and MUX address during setup phase; ignored after conversion begins |
| DO | Data output | MSB-first serial output only; enters TRI-STATE when CS is high; compatible with bidirectional I/O when DI/DO share line |
Key Features
| Feature | Design Value |
|---|---|
| Integrated sample-and-hold | Eliminates need for external S/H circuitry; acquires analog input during MUX settling interval before conversion |
| Configurable analog input modes | Supports single-ended, differential, and pseudo-differential configurations via external biasing-no hardware change required |
| MICROWIRE-compatible serial interface | Reduces system wiring and PCB real estate; enables remote placement near noisy sensors with noise-immune digital transmission |
| No zero or full-scale adjustment | Simplifies calibration; ±1 LSB TUE and monotonic transfer function guaranteed over temperature without trimming |
| Low-power standby mode | Reduces supply current to ~1.0 mA (typical) when CS is high-critical for battery-powered or energy-conscious designs |
Applications
| Remote Sensor Digitization | Industrial Process Monitoring |
|---|---|
|
Use Scenario: Converting thermocouple or RTD signals located meters away from controller in factory floor environments. IC Role / Device Role / Timing Role: ADC08831IMX/NOPB acts as local analog front-end with built-in S/H, performing rail-to-rail 8-bit digitization and transmitting results via noise-immune 3-wire serial link. Use Value: Eliminates analog signal degradation over long traces; ±1 LSB accuracy ensures consistent threshold detection across temperature drift. |
Use Scenario: Monitoring pressure, flow, and level transducers in PLC-based control cabinets with limited board space. IC Role / Device Role / Timing Role: ADC08831IMX/NOPB provides dual-input flexibility (single-ended or differential) to accommodate varied sensor output types while sharing one serial bus. Use Value: Reduces component count vs. discrete mux + ADC solutions; 4 μs conversion enables sub-50 μs loop times for fast-response feedback control. |
| Embedded System Telemetry | Noise-Resilient Instrumentation |
|
Use Scenario: Adding analog sensing to microcontroller-based edge devices (e.g., environmental monitors) with minimal GPIO usage. IC Role / Device Role / Timing Role: ADC08831IMX/NOPB interfaces directly to MCU's SPI-like port using only CS, CLK, and shared DI/DO-no parallel bus overhead. Use Value: Saves 5–7 MCU pins versus parallel-output ADCs; 8.5 mW active power supports always-on monitoring in low-power sleep cycles. |
Use Scenario: Digitizing low-amplitude biomedical or audio signals in presence of 50/60 Hz mains interference. IC Role / Device Role / Timing Role: ADC08831IMX/NOPB leverages differential input to reject common-mode noise; 13 pF input capacitance enables stable sampling with proper source impedance. Use Value: Achieves 48.5 dB SNR and 62.5 dB SFDR-sufficient for 7.7 ENOB-without external instrumentation amplifiers or notch filters. |
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 | Legacy 8-pin DIP version; identical electrical specs but through-hole package; no VSSOP option | Preferred for prototyping or legacy through-hole assemblies; lacks SOIC/VSSOP surface-mount variants | Select ADC0831LCN/NOPB only when DIP footprint and hand-soldering are required; otherwise ADC08831IMX/NOPB offers superior thermal performance and modern packaging. |
| ADS7822U | 12-bit SAR ADC with SPI interface; 2.7–5.25 V supply; 200 ksps; no integrated MUX or S/H | Higher resolution and speed, but requires external S/H and signal conditioning; larger die size and cost | Choose ADS7822U when >8-bit resolution is mandatory and board space permits added components; ADC08831IMX/NOPB remains optimal for cost-sensitive, compact 8-bit sensor nodes. |
Compared with ADC0831LCN/NOPB, ADC08831IMX/NOPB offers surface-mount reliability and lower θJA; compared with ADS7822U, it trades resolution and speed for integrated MUX/S/H, smaller footprint, and lower system BOM count in 8-bit applications.
Availability
ADC08831IMX/NOPB is available at Aetrix Electronics and suitable for industrial process monitoring, embedded telemetry, and remote sensor digitization requiring stable component supply and long-term manufacturability.
Supply support for ADC08831IMX/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 logic technologies, with decades of expertise in precision data converters and industrial-grade IC design.
The ADC08831IMX/NOPB belongs to TI's legacy precision ADC family designed for cost-effective, low-pin-count digitization in resource-constrained embedded systems-emphasizing ease of integration, noise immunity, and minimal external component count.
FAQ
What is the maximum clock frequency supported by ADC08831IMX/NOPB?
The ADC08831IMX/NOPB supports a maximum clock frequency of 2 MHz, as specified in its operating ratings. At this frequency, conversion time is guaranteed ≤4 μs. Clock duty cycle must be maintained between 40% and 60%; deviations require minimum high/low pulse widths of 250 ns. Exceeding 2 MHz may cause timing violations and invalid output codes.
Does ADC08831IMX/NOPB support LSB-first data output?
No, ADC08831IMX/NOPB outputs conversion results MSB-first only. Unlike the ADC08832, it does not support LSB-first mode. The datasheet explicitly states "LSB first output not available on ADC08831", and the functional block diagram confirms single MSB-first serial output path. Attempting LSB-first readout will yield incorrect data.
Can ADC08831IMX/NOPB operate with a 3.3V supply?
No, ADC08831IMX/NOPB requires a minimum supply voltage of 4.5 V and is rated for 4.5 V to 6.0 V operation. Operation at 3.3 V falls outside its Absolute Maximum and Operating Ratings and will result in undefined behavior, including failure to power up analog circuitry, incorrect reference scaling, or non-monotonic output. For 3.3V systems, consider newer TI ADCs like ADS7822U or ADS7816.
What is the purpose of the VREF pin on ADC08831IMX/NOPB?
The VREF pin on ADC08831IMX/NOPB sets the full-scale input voltage range (VIN = 0 to VREF), defining LSB size as VREF/256. It enables ratiometric operation (e.g., tying VREF to VCC) or precision absolute measurement (e.g., using LM385-2.5). Unlike ADC08832, VREF is not internally tied to VCC-making external reference selection essential for accuracy-critical applications.
How does ADC08831IMX/NOPB handle differential input configurations?
ADC08831IMX/NOPB implements a fixed-polarity differential input: VIN(+) is noninverting, VIN(−) is inverting. It supports true differential, pseudo-differential, and single-ended modes via external biasing-no MUX addressing required. If VIN(+) < VIN(−), output is all zeros. Input common-mode range extends from GND −0.05 V to VCC +0.05 V, enabling robust noise rejection in unbalanced signal environments.
ADC08831IMX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- 8-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADC08831IMX/NOPB FAQ
1.How can I place an order for ADC08831IMX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for ADC08831IMX/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 ADC08831IMX/NOPB reliable?
The price and inventory of ADC08831IMX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADC08831IMX/NOPB is usually 5 days.
3.What payment methods are accepted for ADC08831IMX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADC08831IMX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADC08831IMX/NOPB?
ADC08831IMX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADC08831IMX/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 ADC08831IMX/NOPB?
For technical support, including ADC08831IMX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADC08831IMX/NOPB requirements.
6.How does Aetrix verify that ADC08831IMX/NOPB is sourced from the original manufacturer or authorized distributors?
All ADC08831IMX/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 ADC08831IMX/NOPB meets industry standards.
7.What is the process for return or replacement of ADC08831IMX/NOPB?
All ADC08831IMX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with ADC08831IMX/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 ADC08831IMX/NOPB part is unused and in its original packaging.
Return procedure for ADC08831IMX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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