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Texas Instruments ADC08831IM/NOPB
- Part No.:
- ADC08831IM/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADC08831IM/NOPB.pdf
- Description:
- IC ADC 8BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:203
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Product details
Overview
ADC08831IM/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 interface (CS, CLK, DI/DO). It operates on a single 5V supply, achieves ≤4μs 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 space-constrained, low-power, noise-immune serial ADC placement near transducers is required.
For engineers reviewing the ADC08831IM/NOPB datasheet, ADC08831IM/NOPB pinout, ADC08831IM/NOPB application, or ADC08831IM/NOPB equivalent, key selection criteria include its fixed-polarity differential input architecture, MSB-first serial output only, VREF pin availability (vs. ADC08832's internal VCC-referenced design), and SOIC-8/VSSOP-8 package compatibility for industrial signal acquisition.
Technical Context
The ADC08831IM/NOPB implements a successive-approximation register (SAR) core with built-in sample-and-hold, using a ratioed capacitor array for first 5 bits and resistor ladder for last 3 bits. Its analog input structure presents 300Ω series resistance and 13pF sampling capacitance per channel, requiring <1kΩ source impedance for full accuracy.
It uses a 3-wire MICROWIRE-compatible serial interface with chip-select–initiated conversion sequence: CS low enables MUX addressing via DI, followed by automatic ½-clock settling, then MSB-first 8-bit data output on DO. Unlike ADC08832, it lacks MUX address bits - its single differential input pair (IN+ / IN−) has fixed polarity and no software reconfiguration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8 bits - delivers 256 discrete output codes over full-scale range. |
| Conversion Time | ≤4 μs at fCLK = 2 MHz - enables up to 181 ksps sampling rate in continuous mode. |
| Total Unadjusted Error | ±1 LSB max - guarantees monotonicity and no missing codes across temperature. |
| Supply Voltage | 4.5 V to 6.0 V - supports standard 5V systems with ±10% tolerance margin. |
| Power Dissipation | 8.5 mW typical at VCC = 5V, CS = LOW - suitable for battery-backed or thermally constrained designs. |
| Analog Input Range | GND to VCC (with ±50 mV diode clamp margin) - allows rail-to-rail input without external level-shifting. |
| Reference Interface | External VREF pin - enables ratiometric (VREF = VCC) or precision absolute (e.g., LM385-2.5V) operation. |
Pinout & Package
ADC08831IM/NOPB is available in 8-pin SOIC (D) and VSSOP (DGK) packages. Both share identical pin mapping 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 circuitry; must be bypassed with ceramic capacitor near pin. |
| GND | Ground reference | Analog and digital common return; requires low-impedance connection to analog ground plane. |
| IN+ | Differential analog input (+) | Positive terminal of fixed-polarity differential input pair; accepts voltage up to VCC + 0.05V. |
| IN− | Differential analog input (−) | Negative terminal of fixed-polarity differential input pair; accepts voltage down to GND − 0.05V. |
| VREF | Reference voltage input | Sets full-scale span (VIN(max) − VIN(min)); drives internal resistor ladder; min 2.8 kΩ load capability. |
| CS | Chip select input | Active-low initiation signal; must remain low for entire conversion; controls low-power mode when high. |
| CLK | Serial clock input | Drives internal timing; 10 kHz to 2 MHz range; 40–60% duty cycle required for reliable operation. |
| DI/DO | Serial data I/O | Bidirectional line: input during MUX address phase (not used in ADC08831), output during data shift-out (MSB first only). |
Key Features
| Feature | Design Value |
|---|---|
| Integrated track/hold | Acquires analog input during conversion without external S/H circuitry; eliminates aperture jitter in noisy environments. |
| 3-wire serial interface | Reduces PCB routing complexity and EMI susceptibility versus parallel ADCs; compatible with microcontrollers lacking dedicated SPI peripherals. |
| No zero/full-scale adjustment | Factory-trimmed offset and gain eliminate calibration steps in production; reduces BOM and test time. |
| TTL/CMOS logic compatibility | Accepts 2.0V VIH and 0.8V VIL thresholds; interfaces directly with 5V microcontrollers and FPGAs without level shifters. |
| Low-power mode | Reduces ICC to ~0.6 mA (typ) when CS = HIGH; cuts static power by >65% versus active conversion state. |
Applications
| Remote Sensor Digitization | Industrial Process Monitoring |
|---|---|
|
Use Scenario: Converting thermocouple or RTD outputs located meters away from controller in factory floor environments with 60Hz EMI and ground potential differences. IC Role / Device Role / Timing Role: ADC08831IM/NOPB acts as local analog front-end, performing differential sampling and serial digitization at sensor node; eliminates analog voltage drop and noise pickup over long traces. Use Value: Differential input rejects common-mode noise; 8-bit resolution suffices for 0.5°C temperature accuracy; 3-wire interface minimizes wiring count in conduit-limited installations. |
Use Scenario: Monitoring pressure, flow, and valve position signals in PLC-based control cabinets with mixed analog/digital I/O modules. IC Role / Device Role / Timing Role: ADC08831IM/NOPB serves as compact, drop-in ADC for modular analog input cards; interfaces directly to ARM Cortex-M host via GPIO bit-banged serial protocol. Use Value: SOIC-8 footprint fits dense PCB layouts; single 5V supply simplifies power design; ±1LSB TUE ensures repeatability across calibration cycles. |
| Embedded Data Loggers | Noise-Sensitive Instrumentation |
|
Use Scenario: Battery-powered environmental sensors logging temperature/humidity over weeks using ultra-low-quiescent-current microcontrollers. IC Role / Device Role / Timing Role: ADC08831IM/NOPB provides on-demand conversion triggered by MCU wake-up; enters low-power mode between samples to minimize system current draw. Use Value: 3.0 mW (typ) low-power mode extends battery life; 4μs conversion enables rapid wake-sense-sleep cycles; VREF flexibility supports low-voltage reference for extended dynamic range. |
Use Scenario: Precision analog measurement in lab-grade multimeters or oscilloscope front-ends where signal integrity and DC accuracy are critical. IC Role / Device Role / Timing Role: ADC08831IM/NOPB functions as primary digitizer for DC-coupled analog channels, leveraging its no-missing-codes guarantee and monotonic transfer function. Use Value: ±1LSB TUE ensures traceable accuracy without post-calibration; external VREF allows use of 2.5V shunt references for improved stability vs. VCC-referenced alternatives. |
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 electrical specs, but obsolete TI part; no new production; limited distributor stock. | Legacy replacement only; identical functionality but no long-term supply assurance. | Select ADC08831IM/NOPB for guaranteed availability and full TI support lifecycle. |
| ADS7822U | 8-bit, 200 ksps, SPI-compatible, but requires external reference and lacks integrated track/hold. | Higher speed needed; system already includes precision reference and S/H; board space less constrained. | Choose ADS7822U only if sampling rate >181 ksps is mandatory and external S/H is acceptable. |
Compared with ADC0831LCN/NOPB, ADC08831IM/NOPB offers assured supply continuity and identical performance; compared with ADS7822U, it trades 19 ksps speed for integrated track/hold, reduced component count, and simplified layout - making it optimal for cost-sensitive, noise-prone, or space-constrained industrial sensing.
Availability
ADC08831IM/NOPB is available at Aetrix Electronics and suitable for remote sensor digitization, industrial process monitoring, and embedded data loggers requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for ADC08831IM/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 ICs.
The ADC08831IM/NOPB belongs to TI's legacy 8-bit serial ADC family, designed specifically for cost-effective, noise-resilient analog signal acquisition in resource-constrained embedded systems and industrial control nodes.
FAQ
What is the maximum clock frequency supported by ADC08831IM/NOPB?
The ADC08831IM/NOPB supports a maximum clock frequency of 2 MHz, as specified in its operating ratings. At this frequency, conversion time is guaranteed ≤4 μs. Operation above 2 MHz violates Absolute Maximum Ratings and may cause timing violations, incorrect code output, or permanent damage. Clock duty cycle must remain between 40% and 60% for reliable operation across temperature.
Does ADC08831IM/NOPB support LSB-first data output?
No, ADC08831IM/NOPB supports MSB-first serial output only. This is explicitly documented in the datasheet: "*LSB first output not available on ADC08831." Unlike ADC08832, which offers both MSB-first and LSB-first modes, ADC08831IM/NOPB shifts out the most significant bit first during the 8-clock conversion readout phase, with no configuration option to reverse bit order.
Can ADC08831IM/NOPB operate with a 3.3V supply?
No, ADC08831IM/NOPB requires a minimum supply voltage of 4.5 V and is rated for 4.5 V to 6.0 V operation. Using 3.3V violates the Operating Ratings and will result in undefined behavior, including failure to complete conversions, incorrect output codes, or inability to drive logic outputs to valid TTL/CMOS thresholds. For 3.3V systems, consider newer TI parts like ADS7822 or ADS7816.
What is the purpose of the VREF pin on ADC08831IM/NOPB?
The VREF pin on ADC08831IM/NOPB sets the full-scale voltage range for analog input conversion (VIN(max) − VIN(min) = VREF). It enables ratiometric operation (e.g., tying VREF to VCC) or precision absolute measurement (e.g., using LM385-2.5V). Unlike ADC08832, ADC08831IM/NOPB does not internally tie VREF to VCC - the pin must be externally biased and can drive loads down to 2.8 kΩ.
How does ADC08831IM/NOPB handle differential input configurations?
ADC08831IM/NOPB implements a fixed-polarity differential input using dedicated IN+ and IN− pins. It does not support software-configurable MUX addressing like ADC08832. The converter always measures the difference (IN+ − IN−), and outputs 0x00 if IN+ < IN−. No external switching or address bits are needed - the differential pair is hardwired, simplifying firmware and eliminating MUX setup overhead.
ADC08831IM/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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:
- -
ADC08831IM/NOPB FAQ
1.How can I place an order for ADC08831IM/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for ADC08831IM/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 ADC08831IM/NOPB reliable?
The price and inventory of ADC08831IM/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADC08831IM/NOPB is usually 5 days.
3.What payment methods are accepted for ADC08831IM/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADC08831IM/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADC08831IM/NOPB?
ADC08831IM/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADC08831IM/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 ADC08831IM/NOPB?
For technical support, including ADC08831IM/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADC08831IM/NOPB requirements.
6.How does Aetrix verify that ADC08831IM/NOPB is sourced from the original manufacturer or authorized distributors?
All ADC08831IM/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 ADC08831IM/NOPB meets industry standards.
7.What is the process for return or replacement of ADC08831IM/NOPB?
All ADC08831IM/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with ADC08831IM/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 ADC08831IM/NOPB part is unused and in its original packaging.
Return procedure for ADC08831IM/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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