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Texas Instruments ADC0838CCWMX/NOPB
- Part No.:
- ADC0838CCWMX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
ADC0838CCWMX/NOPB.pdf
- Description:
- IC ADC 8BIT SAR 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,482
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Product details
Overview
ADC0838CCWMX/NOPB from Texas Instruments is an 8-bit successive-approximation analog-to-digital converter with integrated 8-channel single-ended or 4-channel differential analog multiplexer, serial MICROWIRE-compatible interface, ±1 LSB total unadjusted error, 32 μs conversion time, and operation from a single 5 V supply. It serves as a sensor interface ADC in embedded data acquisition systems requiring flexible input configuration and noise-immune digital transmission.
For engineers reviewing the ADC0838CCWMX/NOPB datasheet, ADC0838CCWMX/NOPB pinout, ADC0838CCWMX/NOPB application, or ADC0838CCWMX/NOPB equivalent, key selection considerations include its software-configurable MUX addressing, pseudo-differential mode using COM pin, ratiometric or absolute reference operation, and compatibility with microcontrollers lacking parallel ADC interfaces.
Technical Context
The ADC0838CCWMX/NOPB implements a sample-data comparator architecture with internal resistor ladder for successive approximation. Its 8-channel analog multiplexer supports single-ended, differential (adjacent pairs only), and pseudo-differential modes-where the COM pin acts as common-mode reference for any channel.
Digital communication follows TI MICROWIRE protocol: conversion starts on CS low, followed by start bit + 4-bit MUX address on DI, then MSB-first 8-bit result on DO (with optional LSB-first via SE pin). The SAR status line signals conversion progress, and internal zener regulation allows V+ supply operation up to 8.5 V with current limiting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8 bits - delivers 256 discrete output codes over full-scale input range |
| Total Unadjusted Error | ±1 LSB - includes offset, full-scale, linearity, and multiplexer errors; no calibration required |
| Conversion Time | 32 μs - fixed duration at fCLK = 250 kHz; enables up to ~31.25 kSPS throughput |
| Supply Voltage | 4.5 V to 6.3 V - operates from standard 5 V rail; internal zener allows V+ bias up to 8.5 V |
| Analog Input Range | 0 V to VCC - supports 0–5 V input with single 5 V supply; tolerates −0.3 V to VCC + 0.3 V |
| Reference Input | Ratiometric or absolute - VREF tied to VCC for supply-proportional accuracy, or to stable voltage for absolute measurement |
| Power Dissipation | 15 mW typical - low quiescent current (0.9 mA ICC) enables battery-operated or thermally constrained designs |
Pinout & Package
ADC0838CCWMX/NOPB is housed in a 20-pin SOIC package (width: 0.3 inch), with gull-wing leads, surface-mount compatible, and JEDEC MS-013 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable; must remain low for entire conversion cycle; initiates MUX addressing and conversion sequence |
| CLK | Clock Input | Drives internal timing; supports 10–400 kHz; rising edge clocks MUX address bits; falling edge outputs conversion bits |
| DI | Data Input | Serial input for start bit and 4-bit MUX address; ignored after start bit detection; high-impedance during conversion |
| DO | Data Output | Tri-state serial output; MSB-first by default; LSB-first enabled via SE pin; high-impedance when CS high |
| SE | Shift Enable | Controls output format: high = LSB remains valid on DO; low = LSB-first shift-out; not present on ADC0831/32/34 |
| COM | Common Input | Pseudo-differential reference terminal; used as VIN(−) for any channel; supports arbitrary bias point (not necessarily GND) |
| VCC | Supply Voltage | +5 V nominal power; powers logic and analog circuitry; internal zener referenced to V+ |
| VREF | Reference Voltage | Defines full-scale span; internally connected to VCC on ADC0832-N but externally accessible here; 3.5 kΩ input resistance |
| GND | Ground Reference | Analog and digital common return; COM internally disconnected from GND in ADC0838-N |
| IN0–IN7 | Analog Inputs | Eight single-ended channels; configurable as four differential pairs (IN0/IN1, IN2/IN3, etc.) via MUX address |
Key Features
| Feature | Design Value |
|---|---|
| Software-configurable 8-channel MUX | Single-ended, differential (adjacent pairs), or pseudo-differential modes selected per-conversion via 4-bit address |
| MICROWIRE serial interface | Direct connection to COPS-family processors; compatible with standard shift registers; bidirectional DI/DO possible |
| Pseudo-differential input capability | COM pin serves as programmable common-mode reference for any INx channel-enables single-supply transducer interfacing |
| No zero or full-scale adjustment required | Factory-trimmed ±1 LSB error eliminates external calibration; simplifies production test and field maintenance |
| Shunt regulator support | V+ pin accepts up to 8.5 V via internal zener; enables high-voltage supply operation while maintaining safe VCC level |
| Wide temperature range | 0°C to +70°C operating range (CCWM grade) ensures reliability in commercial and industrial control environments |
Applications
| Industrial Sensor Interface | Embedded Data Logger |
|---|---|
Use Scenario: Monitoring multiple RTD, thermistor, or pressure transducer outputs in a PLC I/O module. IC Role / Device Role / Timing Role: ADC0838CCWMX/NOPB acts as front-end digitizer, scanning 8 analog sensors sequentially via software-controlled MUX addressing. Use Value: Eliminates need for external multiplexer and parallel ADC; reduces board space and BOM count while supporting mixed single-ended/differential inputs. |
Use Scenario: Battery-powered environmental monitor logging temperature, humidity, and light intensity at 10-second intervals. IC Role / Device Role / Timing Role: ADC0838CCWMX/NOPB performs low-power conversions triggered by MCU timer; serial interface minimizes wake-up time and GPIO usage. Use Value: 15 mW typical power and no calibration reduce system energy budget and firmware complexity for long-life deployments. |
| Motor Control Feedback | Test & Measurement Front End |
Use Scenario: Sampling current-sense shunt voltages and encoder signals in a compact BLDC motor driver. IC Role / Device Role / Timing Role: ADC0838CCWMX/NOPB acquires differential current measurements (IN0/IN1) and single-ended position feedback (IN2) within tight timing windows. Use Value: Differential mode rejects common-mode noise from PWM switching; 32 μs conversion enables real-time current loop closure at >10 kHz update rates. |
Use Scenario: Modular benchtop instrument acquiring multi-channel analog waveforms for oscilloscope-style display. IC Role / Device Role / Timing Role: ADC0838CCWMX/NOPB provides cost-effective 8-channel sampling with software-selectable input ranges and polarity. Use Value: Pseudo-differential mode (COM as reference) allows simultaneous measurement of floating signals without isolation amplifiers. |
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 |
|---|---|---|---|
| ADC0838CCV/NOPB | Same core functionality and pinout, but in 20-pin PDIP package instead of SOIC; higher thermal resistance and larger footprint | Preferred for through-hole prototyping or legacy board reuse; less suitable for high-density SMT production | Select ADC0838CCV/NOPB only when PDIP mechanical fit or hand-soldering is required; otherwise ADC0838CCWMX/NOPB offers superior manufacturability. |
| ADS7822U | 12-bit resolution, SPI interface, 2.7–5.25 V supply, 2.5 μs conversion time; no integrated MUX; requires external signal conditioning | Better precision and speed for high-fidelity measurement; lacks on-chip multiplexing and pseudo-differential flexibility | Choose ADS7822U when resolution > 8 bits or sub-10 μs latency is mandatory; retain ADC0838CCWMX/NOPB when MUX integration, low cost, or single-supply simplicity is prioritized. |
Compared with ADC0838CCV/NOPB, ADC0838CCWMX/NOPB offers identical electrical performance in a smaller, surface-mount package; compared with ADS7822U, it trades resolution and speed for integrated multiplexing, lower system cost, and simplified design in 8-bit multi-channel applications.
Availability
ADC0838CCWMX/NOPB is available at Aetrix Electronics and suitable for industrial sensor interfaces, embedded data loggers, motor control feedback systems, and test equipment requiring stable component supply across extended product lifecycles.
Supply support for ADC0838CCWMX/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 over 90 years of innovation in precision data conversion and industrial-grade IC design.
The ADC083x family-including ADC0838CCWMX/NOPB-is designed for cost-sensitive, multi-channel data acquisition in commercial and industrial systems where serial interface, software-configurable inputs, and minimal external components are critical.
FAQ
What is the maximum clock frequency supported by ADC0838CCWMX/NOPB?
The ADC0838CCWMX/NOPB supports a clock frequency range of 10 kHz to 400 kHz. At the maximum 400 kHz clock rate, conversion time reduces to approximately 20 μs. Operation outside this range may cause timing violations or incorrect MUX addressing; the device is characterized and guaranteed for proper function only within these limits per the SNAS531B datasheet.
Does ADC0838CCWMX/NOPB require external zero or full-scale calibration?
No, ADC0838CCWMX/NOPB does not require external zero or full-scale calibration. It features factory-trimmed performance with ±1 LSB total unadjusted error across temperature, eliminating the need for user calibration. This applies to all operating conditions specified in the datasheet, including 0°C to +70°C and 4.5 V to 6.3 V supply.
How is the COM pin used in pseudo-differential mode on ADC0838CCWMX/NOPB?
In pseudo-differential mode, the COM pin serves as the common reference (VIN−) for any selected INx channel (VIN+). Unlike true differential mode, COM is not restricted to adjacent pairs and can be biased to any voltage between GND and VCC. This enables accurate measurement of floating or biased signals-such as op-amp outputs referenced to mid-supply-without external level-shifting circuitry.
Can ADC0838CCWMX/NOPB operate with a 3.3 V supply?
No, ADC0838CCWMX/NOPB is not specified for 3.3 V operation. Its absolute minimum supply voltage is 4.5 V, and it is fully characterized from 4.5 V to 6.3 V. Attempting operation at 3.3 V will result in undefined behavior, failure to meet timing specifications, and potential conversion errors due to insufficient headroom for internal circuitry and reference generation.
What is the purpose of the SE (Shift Enable) pin on ADC0838CCWMX/NOPB?
The SE pin controls output data format: when held high, the least significant bit (LSB) remains valid on the DO pin; when pulled low, the 8-bit result shifts out LSB-first. This feature is unique to ADC0838-N among the ADC083x family and provides flexibility for microcontrollers with limited shift-register configurations or specific byte-order requirements in firmware.
ADC0838CCWMX/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:
- 0°C ~ 70°C
- Supplier Device Package:
- 20-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADC0838CCWMX/NOPB FAQ
1.How can I place an order for ADC0838CCWMX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for ADC0838CCWMX/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 ADC0838CCWMX/NOPB reliable?
The price and inventory of ADC0838CCWMX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADC0838CCWMX/NOPB is usually 5 days.
3.What payment methods are accepted for ADC0838CCWMX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADC0838CCWMX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADC0838CCWMX/NOPB?
ADC0838CCWMX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADC0838CCWMX/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 ADC0838CCWMX/NOPB?
For technical support, including ADC0838CCWMX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADC0838CCWMX/NOPB requirements.
6.How does Aetrix verify that ADC0838CCWMX/NOPB is sourced from the original manufacturer or authorized distributors?
All ADC0838CCWMX/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 ADC0838CCWMX/NOPB meets industry standards.
7.What is the process for return or replacement of ADC0838CCWMX/NOPB?
All ADC0838CCWMX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with ADC0838CCWMX/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 ADC0838CCWMX/NOPB part is unused and in its original packaging.
Return procedure for ADC0838CCWMX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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