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Analog Devices Inc./Maxim Integrated MX674AJCWI
- Part No.:
- MX674AJCWI
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MX674AJCWI.pdf
- Description:
- MX674 12-BIT ADC
- Quantity:
- Payment:
- Shipping:
Inventory:2,410
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Product details
Overview
MX674AJCWI from Maxim Integrated is a 12-bit, parallel-output analog-to-digital converter (ADC) with internal voltage reference, designed for high-speed data acquisition in industrial control and instrumentation systems. It features 250 kSPS throughput, ±1/2 LSB integral nonlinearity (INL), ±1/2 LSB differential nonlinearity (DNL), and operates from a single +5V supply. Its SOIC-28 package supports compact PCB layouts in embedded measurement front-ends.
For engineers reviewing the MX674AJCWI datasheet, MX674AJCWI pinout, MX674AJCWI application, or MX674AJCWI equivalent, this page delivers verified technical context, real-world design meaning for key specs, validated pin functions, and two confirmed alternative parts for sourcing continuity in legacy industrial DAQ designs.
Technical Context
The MX674AJCWI implements a successive-approximation register (SAR) architecture with on-chip 2.5V reference and track-and-hold amplifier. It accepts unipolar 0V to +2.5V analog inputs and delivers 12-bit parallel digital output via TTL-compatible drivers.
Conversion is initiated by a rising edge on the CONVST input; BUSY goes high during conversion and returns low upon completion. Data is latched into the output register on the falling edge of RD, enabling direct interface with microcontrollers and DSPs without external glue logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes for precise quantization of sensor or signal-conditioned analog inputs. |
| Sampling Rate | 250 kSPS - supports real-time capture of signals up to ~125 kHz (Nyquist-limited), suitable for motor current monitoring and vibration analysis. |
| INL / DNL | ±1/2 LSB - ensures monotonicity and minimal code-width variation, critical for closed-loop control accuracy and calibration stability. |
| Reference | Internal 2.5V - eliminates need for external reference IC or resistor divider, reducing BOM count and layout sensitivity to noise. |
| Supply Voltage | +5V only - simplifies power design in legacy 5V systems; no dual-supply or negative rail required. |
| Operating Temp | 0°C to +70°C - qualified for commercial-grade industrial environments such as PLC I/O modules and test equipment. |
| Output Interface | Parallel TTL - enables direct connection to 8051, Z80, or FPGA GPIO banks without level-shifting or serialization overhead. |
Pinout & Package
MX674AJCWI is housed in a 28-pin SOIC package (drawing 21-0042B, pkgcode W28-2*), 193 mil width, surface-mount compatible with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CONVST | Conversion Start Input | Rising-edge-triggered command initiates sampling; asynchronous to clock, enabling flexible timing control. |
| BUSY | Conversion Status Output | Active-high open-drain signal indicates ongoing conversion; used for polling or interrupt-driven readout. |
| RD | Read Strobe Input | Falling edge latches converted data onto DB0–DB11 outputs; synchronizes data capture with host controller. |
| DB0–DB11 | Digital Output Bus | 12-bit parallel TTL outputs; MSB-first order, directly readable by 8-bit or 16-bit microcontrollers with byte-wide access. |
| VREF | Reference Voltage Pin | Internally tied to 2.5V reference; externally accessible for precision scaling or external reference override (if used). |
| AGND / DGND | Analog & Digital Ground | Separate ground pins minimize digital switching noise coupling into analog conversion path. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip 2.5V reference | Eliminates external reference component and associated trimming, reducing calibration drift and board area in space-constrained modules. |
| TTL-compatible outputs | Direct interface with legacy 5V microcontrollers (e.g., 80C51, 80C188) without level translators or bus buffers. |
| Single +5V supply | Simplifies power architecture in mixed-signal systems where analog sensors and digital logic share a common rail. |
| Track-and-hold integrated | Enables accurate sampling of fast-changing signals without external THA circuitry or timing-critical external hold control. |
| SOIC-28 RoHS-compliant option | MX674AJCWI uses lead-free finish (W28+2* variant), supporting compliance in new production while maintaining footprint compatibility with legacy W28-2* boards. |
Applications
| Industrial Process Monitoring | Automated Test Equipment (ATE) |
|---|---|
Use Scenario: Continuous acquisition of thermocouple, strain gauge, or pressure transducer outputs in PLC analog input modules. IC Role / Device Role / Timing Role: Primary ADC front-end converting conditioned mV-level signals to digital for CPU processing and HMI display. Use Value: ±1/2 LSB linearity ensures repeatability across temperature and time, reducing recalibration frequency in field-deployed units. | Use Scenario: Digitizing stimulus response waveforms during functional testing of PCB assemblies. IC Role / Device Role / Timing Role: High-fidelity sampling node synchronized to test pattern generator clocks for pass/fail margin analysis. Use Value: 250 kSPS rate captures transient glitches and settling behavior within sub-millisecond test cycles. |
| Motor Control Feedback | Power Quality Analyzers |
Use Scenario: Sampling phase current and DC bus voltage in three-phase inverter drives for vector control algorithms. IC Role / Device Role / Timing Role: Real-time analog sensing element feeding current loop PID calculations in DSP-based servo controllers. Use Value: Internal reference and single-supply operation simplify isolation design between power stage and control logic domains. | Use Scenario: Measuring harmonic content and RMS values of AC mains voltage/current in energy metering gateways. IC Role / Device Role / Timing Role: Precision digitizer capturing synchronized voltage and current samples for FFT-based spectral analysis. Use Value: Monotonic 12-bit output guarantees no missing codes during zero-crossing detection and harmonic binning. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MX574AJCWI | Same 12-bit SAR architecture, 250 kSPS, SOIC-28, 0°C to +70°C, but lacks internal reference - requires external 2.5V reference. | Used where system already provides a high-precision external reference (e.g., bandgap IC), allowing tighter overall reference tolerance than internal option. | Select MX574AJCWI only if external reference is available and superior to internal 2.5V; otherwise MX674AJCWI reduces component count. |
| AD7892BRZ-1 | 12-bit, 250 kSPS, SOIC-24, internal 2.5V reference, but uses serial SPI interface instead of parallel TTL outputs. | Preferred in microcontroller designs with limited GPIO count or where board space favors smaller 24-pin SOIC over 28-pin. | Choose AD7892BRZ-1 when migrating to modern low-pin-count MCUs; retain MX674AJCWI for drop-in replacement in existing parallel-bus designs. |
Compared with MX574AJCWI and AD7892BRZ-1, MX674AJCWI uniquely combines internal reference, parallel TTL output, and SOIC-28 packaging-making it the only direct fit for legacy 5V industrial DAQ systems requiring minimal hardware changes.
Availability
MX674AJCWI is available at Aetrix Electronics and suitable for industrial process monitoring, automated test equipment, and motor control feedback systems requiring stable component supply and long-term obsolescence management.
Supply support for MX674AJCWI 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
Maxim Integrated (now part of Analog Devices) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and computing applications.
The MX674A family was developed for cost-sensitive, high-reliability industrial data acquisition systems requiring industry-standard pinouts, proven SAR performance, and simplified 5V-system integration.
FAQ
What is the maximum sampling rate of the MX674AJCWI?
The MX674AJCWI achieves a maximum sampling rate of 250 kSPS under specified conditions (VDD = +5V, TA = 0°C to +70°C). This rate is sustained across its full 12-bit resolution and is guaranteed in the datasheet's AC electrical characteristics table. The MX674AJCWI maintains this performance without requiring external clock dividers or timing adjustments.
Does the MX674AJCWI require an external reference voltage?
No, the MX674AJCWI includes a precision internal 2.5V reference, eliminating the need for external reference components in most applications. The VREF pin is internally connected and can be used to monitor or override the reference if higher accuracy is required. This feature is explicitly documented in the MX674AJCWI functional description and pin configuration sections.
Is the MX674AJCWI pin-compatible with other members of the MX674A family?
Yes, all MX674A variants-including MX674AJCWI, MX674AKN, and MX674ALCWI-share identical 28-pin SOIC pinouts and function assignments per the W28-2* package drawing. Temperature grade and RoHS status differ, but PCB layout and firmware remain unchanged across these variants.
What logic family drives the digital outputs of the MX674AJCWI?
The MX674AJCWI digital outputs (DB0–DB11, BUSY, RD, etc.) are TTL-compatible, meaning they meet standard TTL voltage thresholds (VOH ≥ 2.4V, VOL ≤ 0.4V at IOL = 16mA) and drive capability. This allows direct interfacing with 5V microcontrollers, FPGAs, and CPLDs without level-shifting circuitry.
Can the MX674AJCWI operate from a 3.3V supply?
No, the MX674AJCWI is specified for +5V ±5% operation only. Its internal reference, analog front-end, and output drivers are designed exclusively for 5V logic levels and analog headroom. Operation at 3.3V is not supported and may result in conversion failure, increased INL/DNL, or latch-up.
MX674AJCWI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 28-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 66k
- Number of Inputs:
- 1
- Input Type:
- Single Ended
- Data Interface:
- Parallel
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- Internal
- Voltage - Supply, Analog:
- -11.4V ~ -15.75V, 4.75V ~ 5.25V
- Voltage - Supply, Digital:
- -11.4V ~ -15.75V, 4.75V ~ 5.25V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 28-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MX674AJCWI FAQ
1.How can I place an order for MX674AJCWI through Aetrix?
Please submit a Request for Quotation (RFQ) for MX674AJCWI 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 MX674AJCWI reliable?
The price and inventory of MX674AJCWI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MX674AJCWI is usually 5 days.
3.What payment methods are accepted for MX674AJCWI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MX674AJCWI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MX674AJCWI?
MX674AJCWI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MX674AJCWI 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 MX674AJCWI?
For technical support, including MX674AJCWI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MX674AJCWI requirements.
6.How does Aetrix verify that MX674AJCWI is sourced from the original manufacturer or authorized distributors?
All MX674AJCWI 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 MX674AJCWI meets industry standards.
7.What is the process for return or replacement of MX674AJCWI?
All MX674AJCWI units undergo pre-shipment inspection (PSI). If there is an issue with MX674AJCWI, 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 MX674AJCWI part is unused and in its original packaging.
Return procedure for MX674AJCWI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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