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Texas Instruments ADC0838CIWMX/NOPB
- Part No.:
- ADC0838CIWMX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
ADC0838CIWMX/NOPB.pdf
- Description:
- IC ADC 8BIT SAR 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,602
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Product details
Overview
ADC0838CIWMX/NOPB from Texas Instruments is an 8-bit successive-approximation analog-to-digital converter with an integrated 8-channel analog multiplexer, serial MICROWIRE-compatible interface, single 5 V supply operation, ±1 LSB total unadjusted error, and 32 μs conversion time. It supports software-configurable single-ended, differential, and pseudo-differential input modes for sensor signal acquisition in embedded data loggers.
For engineers reviewing the ADC0838CIWMX/NOPB datasheet, ADC0838CIWMX/NOPB pinout, ADC0838CIWMX/NOPB application, or ADC0838CIWMX/NOPB equivalent, key selection considerations include its 20-pin SOIC package, ratiometric or external reference operation, 0 V to 5 V input range, TI MICROWIRE serial protocol compatibility, and support for mixed-mode channel addressing without external zero/full-scale calibration.
Technical Context
The ADC0838CIWMX/NOPB implements a sample-data comparator architecture with a resistor ladder DAC for successive approximation. Its 8-channel multiplexer is fully software-addressable via a 4-bit MUX word shifted in on the DI line after a start bit, enabling dynamic reconfiguration between single-ended, differential (adjacent pairs only), and pseudo-differential modes per conversion.
Conversion timing is synchronized to an external clock (10–400 kHz); the SAR status line goes high during conversion, and data is output MSB-first on DO. The SE pin allows LSB-first output mode selection, and internal zener regulation permits operation from a high-voltage V+ supply (6.3–8.5 V) with current limiting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8 bits - delivers 256 discrete digital codes over full-scale input range |
| Total Unadjusted Error | ±1 LSB - includes offset, full-scale, linearity, and multiplexer errors; no calibration required |
| Supply Voltage | 4.5 V to 6.3 V - operates from standard 5 V rail or regulated higher voltage via internal shunt zener |
| Conversion Time | 32 μs - fixed duration at 250 kHz clock; enables up to ~31.25 kSPS throughput |
| Input Range | 0 V to 5 V with single 5 V supply - supports ratiometric sensing when VREF = VCC |
| Power Dissipation | 15 mW typical - low quiescent current (2.5 mA max ICC) suitable for battery-powered systems |
| Reference Input | 3.5 kΩ typical impedance - requires stable voltage source or direct tie to VCC for ratiometric use |
Pinout & Package
The ADC0838CIWMX/NOPB is housed in a 20-pin SOIC (Small Outline Integrated Circuit) package with 0.3-inch body width and standard JEDEC MS-013AC footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Positive Supply | Primary 4.5–6.3 V power input; powers logic and analog sections; internally connects to VREF in ratiometric mode |
| GND | Ground Reference | Analog and digital common return; must be low-impedance for accurate conversion |
| DI | Serial Data Input | Accepts start bit and 4-bit MUX address during CS low; ignored after conversion starts |
| DO | Serial Data Output | Tri-state output delivering MSB-first conversion result; toggles on CLK falling edge |
| CLK | Serial Clock Input | External timing source (10–400 kHz); controls MUX addressing, conversion, and data shift-out |
| CS | Chip Select | Active-low enable; must remain low for entire conversion cycle (~32 μs minimum) |
| SE | Shift Enable | Controls output format: high = MSB-first; low = LSB-first; not present on ADC0831/32/34 variants |
| IN0–IN7 | Analog Input Channels | Eight single-ended inputs; configurable as four differential pairs (IN0/IN1, IN2/IN3, etc.) or pseudo-differential with COM |
| COM | Common Input Terminal | Used as shared "−" reference for pseudo-differential mode; accepts arbitrary bias voltage (e.g., mid-supply) |
| VREF | Reference Voltage Input | Sets full-scale span (VREF/256 per LSB); tied to VCC internally in ADC0832-N but externally accessible here |
| V+ | High-Voltage Supply Input | Optional 6.3–8.5 V input; powers device via internal zener diode and series diode to VCC |
Key Features
| Feature | Design Value |
|---|---|
| Software-Configurable Multiplexer | Enables per-conversion selection of single-ended, differential, or pseudo-differential input mode across 8 channels |
| MICROWIRE-Compatible Serial Interface | Direct connection to COPS-family processors without glue logic; bidirectional DI/DO possible with tri-state control |
| No Calibration Required | Factory-trimmed offset and full-scale; ±1 LSB total unadjusted error eliminates system-level trimming circuitry |
| Ratiometric Operation Support | VREF can be tied to VCC, making conversion insensitive to supply drift-ideal for transducer interfaces powered from same rail |
| Pseudo-Differential Input Mode | COM pin serves as programmable "−" reference for any INx channel, supporting biased single-supply sensor signals |
Applications
| Industrial Sensor Monitoring | Embedded Data Logger |
|---|---|
Use Scenario: Continuous acquisition of temperature, pressure, and humidity sensor outputs in factory-floor PLC I/O modules. IC Role / Device Role / Timing Role: ADC0838CIWMX/NOPB acts as the front-end A/D converter, scanning up to eight analog sensors sequentially via its internal multiplexer and delivering noise-immune serial digital data to an MCU. Use Value: Eliminates need for external multiplexer and level-shifting circuitry; 0–5 V input range matches standard industrial sensor outputs; ±1 LSB accuracy ensures reliable threshold detection. | Use Scenario: Portable environmental monitoring unit logging soil moisture, light intensity, and ambient CO₂ using battery-powered microcontroller. IC Role / Device Role / Timing Role: ADC0838CIWMX/NOPB performs low-power analog digitization with 15 mW consumption and supports pseudo-differential mode for single-supply op-amp sensor conditioning. Use Value: Enables true 8-channel capability in compact SOIC package; ratiometric operation maintains accuracy despite battery voltage sag; no calibration reduces BOM and firmware overhead. |
| Automotive Cabin Control | Medical Instrument Front-End |
Use Scenario: HVAC control module measuring cabin temperature, sunlight intensity, and blower motor current in passenger vehicles. IC Role / Device Role / Timing Role: ADC0838CIWMX/NOPB interfaces with thermistors, photodiodes, and current-sense resistors, using differential mode to reject engine compartment EMI. Use Value: Differential input rejects common-mode noise from alternator ripple and ignition pulses; 32 μs conversion time supports real-time feedback loop updates; SOIC package meets automotive board space constraints. | Use Scenario: Portable pulse oximeter acquiring red/IR photodiode signals and thermistor-based skin temperature in clinical settings. IC Role / Device Role / Timing Role: ADC0838CIWMX/NOPB digitizes low-amplitude, high-impedance analog signals with pseudo-differential mode referencing a stable bias voltage to improve SNR. Use Value: COM pin allows precise DC biasing of photodiode amplifiers; ±1 LSB error ensures reproducible SpO₂ calculation; 20-pin SOIC simplifies layout versus discrete mux + ADC solutions. |
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 |
|---|---|---|---|
| ADC0838CCN | Same core functionality, but in 20-pin PDIP package; wider operating temperature range (−40°C to +85°C vs. 0°C to +70°C for CIWMX/NOPB) | Preferred for industrial environments requiring extended temperature tolerance and through-hole assembly | Select ADC0838CCN when board-level reliability under thermal stress is critical and PDIP is acceptable |
| ADS7822U | 12-bit resolution, SPI interface, 2.7–5.25 V supply, 2.5 μs conversion time; higher speed and precision but no built-in multiplexer | Suited for high-accuracy, low-latency single-channel applications where external mux or parallel sampling is used | Choose ADS7822U when resolution >8 bits or sub-μs latency is required, accepting added external component count |
Compared with ADC0838CCN, the ADC0838CIWMX/NOPB offers identical electrical performance in a smaller SOIC package but with narrower temperature rating; compared with ADS7822U, it trades resolution and speed for integrated 8-channel multiplexing and simpler system-level integration in cost-sensitive, multi-sensor designs.
Availability
ADC0838CIWMX/NOPB is available at Aetrix Electronics and suitable for industrial sensor monitoring, embedded data loggers, automotive cabin control, and medical instrument front-ends requiring stable component supply and long-term production continuity.
Supply support for ADC0838CIWMX/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 heritage in precision data converters and industrial-grade ICs.
The ADC083x family-including ADC0838CIWMX/NOPB-is designed for cost-sensitive, multi-sensor embedded systems requiring simple serial interfacing, minimal external components, and robust operation in noisy environments without calibration.
FAQ
What is the maximum clock frequency supported by ADC0838CIWMX/NOPB?
The ADC0838CIWMX/NOPB supports a maximum clock frequency of 400 kHz, as specified in its AC characteristics table. At this rate, conversion time reduces to approximately 20 μs. Operation above 400 kHz may cause timing violations, incomplete MUX settling, or incorrect data output. For reliable 32 μs conversion at nominal conditions, a 250 kHz clock is recommended per the datasheet test conditions.
Does ADC0838CIWMX/NOPB require external zero or full-scale adjustment?
No, ADC0838CIWMX/NOPB does not require external zero or full-scale adjustment. Its total unadjusted error is guaranteed at ±1 LSB over temperature, and the device is factory trimmed. The datasheet explicitly states "No Zero or Full-Scale Adjust Required," and all tested units meet this specification without user calibration-reducing design complexity and production test burden.
Can ADC0838CIWMX/NOPB operate with a 3.3 V supply?
No, ADC0838CIWMX/NOPB cannot operate reliably with a 3.3 V supply. Its absolute minimum supply voltage is 4.5 VDC, and the recommended operating range is 4.5 V to 6.3 V. At 3.3 V, internal circuitry-including the resistor ladder, comparator, and digital logic-fails to function correctly, resulting in invalid conversions or non-responsive behavior. For 3.3 V systems, consider newer TI alternatives like the ADS7822 or MCP3208.
How does the pseudo-differential mode work on ADC0838CIWMX/NOPB?
In pseudo-differential mode, the COM pin serves as the "−" input reference for any selected INx channel (e.g., IN0–IN7). The voltage on COM need not be ground-it can be any stable bias point common to all sensors (e.g., 2.5 V mid-rail). ADC0838CIWMX/NOPB then computes the difference between the selected INx voltage and COM, enabling accurate digitization of single-supply, biased sensor outputs without external op-amps.
Is ADC0838CIWMX/NOPB pin-compatible with other ADC083x variants?
No, ADC0838CIWMX/NOPB is not pin-compatible with ADC0831-N, ADC0832-N, or ADC0834-N due to differing pin counts (8-, 14-, or 20-pin variants) and functional pin assignments. While ADC0838CIWMX/NOPB shares the 20-pin SOIC footprint with ADC0838BCV and ADC0838CCV, it differs electrically in temperature grade and packaging (NOPB = lead-free, CIWM = commercial temp). Always verify pin mapping and timing against the specific variant's datasheet before substitution.
ADC0838CIWMX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 8
- Sampling Rate (Per Second):
- -
- Number of Inputs:
- 4, 8
- Input Type:
- Differential, Pseudo-Differential, Single Ended
- Data Interface:
- SPI
- Configuration:
- MUX-ADC
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External
- Voltage - Supply, Analog:
- 4.5V ~ 6.3V
- Voltage - Supply, Digital:
- 4.5V ~ 6.3V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 20-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADC0838CIWMX/NOPB FAQ
1.How can I place an order for ADC0838CIWMX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for ADC0838CIWMX/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 ADC0838CIWMX/NOPB reliable?
The price and inventory of ADC0838CIWMX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADC0838CIWMX/NOPB is usually 5 days.
3.What payment methods are accepted for ADC0838CIWMX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADC0838CIWMX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADC0838CIWMX/NOPB?
ADC0838CIWMX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADC0838CIWMX/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 ADC0838CIWMX/NOPB?
For technical support, including ADC0838CIWMX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADC0838CIWMX/NOPB requirements.
6.How does Aetrix verify that ADC0838CIWMX/NOPB is sourced from the original manufacturer or authorized distributors?
All ADC0838CIWMX/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 ADC0838CIWMX/NOPB meets industry standards.
7.What is the process for return or replacement of ADC0838CIWMX/NOPB?
All ADC0838CIWMX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with ADC0838CIWMX/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 ADC0838CIWMX/NOPB part is unused and in its original packaging.
Return procedure for ADC0838CIWMX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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