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Texas Instruments ADC08831IM
- Part No.:
- ADC08831IM
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADC08831IM.pdf
- Description:
- IC ADC 8BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,299
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Product details
Overview
ADC08831IM 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 from a single 5V supply, delivers ±1 LSB total unadjusted error, and achieves 4 μs max conversion time at 2 MHz clock. It is used in embedded sensor digitization where space-constrained, low-power, noise-immune serial ADCs are required.
For engineers reviewing the ADC08831IM datasheet, ADC08831IM pinout, ADC08831IM application, or ADC08831IM equivalent, key selection considerations include its fixed-polarity differential input architecture, VREF pin availability (enabling ratiometric or absolute reference configurations), MSB-first-only serial output format, and SOIC/VSSOP-8 package compatibility with legacy ADC0831 designs.
Technical Context
The ADC08831IM implements a successive-approximation register (SAR) core with built-in sample-and-hold, using a ratioed capacitor array for the first 5 bits and resistor ladder for the last 3 bits. Its analog front-end features 300 Ω series resistance and 13 pF sampling capacitance per input, requiring careful source impedance management to ensure full-scale settling within ½ clock period.
Digital control uses a 3-wire MICROWIRE-compatible interface: CS initiates conversion, CLK synchronizes data transfer, and DI accepts only a start bit (no MUX address - unlike ADC08832). Output appears on DO as MSB-first serial data after conversion completion, with automatic TRI-STATE disable when CS returns high.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8 bits - provides 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 monotonicity and no missing codes across −40°C to +85°C. |
| Supply Voltage Range | 4.5 V to 6.0 V - supports standard 5V systems with ±10% tolerance margin. |
| Power Dissipation | 8.5 mW typical at 5V/CS low - drops to 3.0 mW typical in low-power mode (CS high). |
| Analog Input Range | GND to VCC - allows rail-to-rail input without external level-shifting when VREF = VCC. |
| Reference Interface | External VREF pin - enables flexible ratiometric (VREF = VCC) or precision absolute (e.g., LM385-2.5V) reference configurations. |
Pinout & Package
ADC08831IM is available in 8-pin SOIC (D) and VSSOP (DGK) packages - both surface-mount, lead-free compatible, with 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 | Single 4.5–6.0 V power rail; powers analog core, digital logic, and internal reference ladder. |
| GND | Ground reference | Analog and digital common return; must connect directly to low-impedance analog ground plane. |
| VIN(+) / VIN(−) | Differential analog inputs | Fixed-polarity differential pair (no MUX addressing); accepts ±50 mV beyond rails without code corruption. |
| VREF | Reference voltage input | Defines full-scale span (0 to VREF); requires ≥2.8 kΩ drive capability; not tied internally to VCC. |
| CS | Chip select | Active-low initiation signal; holds converter in low-power mode when high; must remain low during full conversion. |
| CLK | Serial clock input | Accepts 10 kHz–2 MHz clock; 40–60% duty cycle required; controls timing of MUX setup and SAR iteration. |
| DI | Data input | Accepts start bit only (no MUX address); ignored after start bit detection; enables bidirectional wire sharing with DO. |
| DO | Data output | MSB-first serial output only; enters TRI-STATE when CS high; outputs leading zero during MUX settle time. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated track/hold | Enables accurate sampling of time-varying analog signals without external S/H circuitry or timing-critical external control. |
| 3-wire serial interface | Reduces board routing complexity and EMI susceptibility versus parallel ADCs; compatible with COPS-family microcontrollers and shift registers. |
| No zero/full-scale adjustment | Eliminates factory calibration steps and trim potentiometers - simplifies production test and improves long-term stability. |
| TTL/CMOS I/O compatibility | Interfaces directly with 5V logic families without level-shifting; VIH = 2.0 V min, VIL = 0.8 V max ensures robust noise margin. |
| Low-power mode | Reduces supply current to ~1.0 mA (CS high) - critical for battery-powered or thermally constrained embedded systems. |
Applications
| Sensor Signal Digitization | Process Control Monitoring |
|---|---|
|
Use Scenario: Converting output of resistive temperature detectors (RTDs), thermistors, or bridge-based pressure sensors in industrial PLC modules. IC Role / Device Role / Timing Role: ADC08831IM acts as the primary analog front-end digitizer, performing single-ended or differential acquisition with built-in track/hold to reject noise during sampling. Use Value: Its ±1 LSB TUE and no-missing-codes guarantee ensures linear sensor response mapping across temperature; VREF flexibility supports both ratiometric (VCC-referenced) and absolute (precision shunt-referenced) measurement modes. |
Use Scenario: Monitoring analog process variables (flow, level, pH) in distributed control systems with isolated field transmitters. IC Role / Device Role / Timing Role: ADC08831IM serves as the local A/D stage at the sensor node, converting conditioned analog signals before serial transmission over twisted-pair backplane links. Use Value: The 3-wire serial interface minimizes interconnect count and eliminates analog signal routing across noisy digital zones; GND-to-VCC input range accommodates 0–5 V or 4–20 mA loop receiver outputs directly. |
| Remote Sensing in Noisy Environments | Embedded Systems Data Acquisition |
|
Use Scenario: Digitizing signals from motors, solenoids, or AC mains-sensed circuits in factory automation cabinets with high EMI. IC Role / Device Role / Timing Role: ADC08831IM performs differential sampling between VIN(+) and VIN(−), rejecting common-mode noise (e.g., 60 Hz) induced on long sensor cables. Use Value: Its short ½-clock-period differential sampling window (≤500 ns at 2 MHz) limits common-mode voltage drift error to <¼ LSB for 60 Hz interference - enabling reliable readings without external filtering. |
Use Scenario: Adding analog sensing capability to resource-limited microcontroller-based devices such as smart meters or HVAC controllers. IC Role / Device Role / Timing Role: ADC08831IM functions as a compact, low-pin-count ADC peripheral, interfacing via GPIO bit-banged SPI to MCUs lacking native hardware SPI support. Use Value: MSB-first-only output and start-bit-only protocol simplify firmware implementation; SOIC-8 footprint allows drop-in replacement of legacy ADC0831 while adding track/hold and improved accuracy. |
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 |
|---|---|---|---|
| ADC0831IM | Same pinout, no internal track/hold, no VREF pin (VREF = VCC), higher TUE (±2 LSB), slower conversion (32 μs). | Lacks sampling integrity for dynamic signals; limited to static or slowly varying inputs. | Select ADC08831IM when track/hold, tighter accuracy, or external reference control is required. |
| ADS7822U | 8-bit, 200 ksps, SPI-compatible, internal reference, 6-pin SOT-23 package, no multiplexer. | Higher speed but no analog input switching; smaller footprint but no VREF flexibility or differential input option. | Choose ADS7822U for ultra-compact, high-throughput single-channel applications where reference and layout simplicity outweigh multiplexing needs. |
Compared with ADC0831IM, ADC08831IM adds track/hold and ±1 LSB accuracy at same pinout; compared with ADS7822U, it trades speed and size for dual-input flexibility, external VREF, and proven noise immunity in legacy industrial designs.
Availability
ADC08831IM is available at Aetrix Electronics and suitable for sensor digitization, process control monitoring, and remote sensing applications requiring stable component supply, long-lifecycle support, and consistent parametric performance across temperature.
Supply support for ADC08831IM 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 high-reliability components for industrial, automotive, and communications markets.
The ADC08831IM belongs to TI's legacy precision data acquisition portfolio, designed specifically for cost-sensitive, noise-prone embedded systems needing simple, robust, and pin-compatible 8-bit serial ADC functionality with minimal external components.
FAQ
What is the maximum clock frequency supported by ADC08831IM?
The ADC08831IM supports a maximum clock frequency of 2 MHz, as specified in its operating ratings. At this frequency, conversion time is guaranteed ≤4 μs, enabling up to 181 ksps sampling. Operation above 2 MHz is not characterized and may result in timing violations, increased TUE, or incorrect output codes. For reliable performance, maintain clock duty cycle between 40% and 60%, and ensure rise/fall times ≤20 ns.
Does ADC08831IM support differential input mode?
Yes, ADC08831IM supports true differential input mode using its dedicated VIN(+) and VIN(−) pins with fixed polarity. Unlike the ADC08832, it does not require MUX addressing - the differential pair is always active. This configuration rejects common-mode noise and enables precise measurement of floating or ground-isolated signals, provided the input voltage remains within GND −0.05 V to VCC +0.05 V.
Can ADC08831IM be used with a 3.3V microcontroller interface?
ADC08831IM is specified for 4.5–6.0 V operation and has TTL/CMOS-compatible inputs (VIH ≥2.0 V, VIL ≤0.8 V), so direct connection to 3.3V logic is not recommended. Driving CS, CLK, or DI from a 3.3V MCU may cause marginal high-level recognition or increased static power due to VIH–VCC voltage mismatch. Use level-shifting buffers or operate ADC08831IM at 5V with 3.3V-tolerant I/O drivers to ensure reliable communication and low-power mode entry.
What is the purpose of the VREF pin on ADC08831IM?
The VREF pin on ADC08831IM sets the full-scale analog input range (0 to VREF). It enables ratiometric operation (e.g., tying VREF to VCC for supply-tracking measurements) or absolute accuracy (e.g., connecting a precision 2.5V shunt reference like LM385-2.5). VREF must be driven by a source capable of ≥2.8 kΩ load; internal reference ladder draws current continuously, independent of CS state - unlike the ADC08832 where reference is tied to VCC.
Is ADC08831IM pin-compatible with ADC0831IM?
Yes, ADC08831IM is explicitly designed as a superior pin-compatible replacement for ADC0831IM in SOIC-8 and VSSOP-8 packages. Pin mapping, supply requirements, and serial interface timing are identical. Key upgrades include integrated track/hold, ±1 LSB TUE (vs ±2 LSB), 4 μs conversion (vs 32 μs), and external VREF support - all delivered without PCB layout changes or firmware modification beyond enabling the new features.
ADC08831IM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- 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:
- 8-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADC08831IM FAQ
1.How can I place an order for ADC08831IM through Aetrix?
Please submit a Request for Quotation (RFQ) for ADC08831IM 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 reliable?
The price and inventory of ADC08831IM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADC08831IM is usually 5 days.
3.What payment methods are accepted for ADC08831IM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADC08831IM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADC08831IM?
ADC08831IM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADC08831IM 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?
For technical support, including ADC08831IM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADC08831IM requirements.
6.How does Aetrix verify that ADC08831IM is sourced from the original manufacturer or authorized distributors?
All ADC08831IM 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 meets industry standards.
7.What is the process for return or replacement of ADC08831IM?
All ADC08831IM units undergo pre-shipment inspection (PSI). If there is an issue with ADC08831IM, 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 part is unused and in its original packaging.
Return procedure for ADC08831IM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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