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Analog Devices Inc./Maxim Integrated MX574AKCWI+
- Part No.:
- MX574AKCWI+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MX574AKCWI+.pdf
- Description:
- IC ADC 12BIT SAR 28SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,802
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Product details
Overview
MX574AKCWI+ from Maxim Integrated is a monolithic 12-bit successive-approximation analog-to-digital converter (ADC) with integrated buried-zener voltage reference, on-chip clock, and BiCMOS process. It delivers 25μs max conversion time, ±1/2 LSB integral nonlinearity (at +25°C), 150mW power dissipation at ±15V supplies, and supports ±5V/±10V bipolar or 0–+10V/0–+20V unipolar input ranges via pin strapping - used in high-accuracy industrial data acquisition systems.
For engineers reviewing the MX574AKCWI+ datasheet, MX574AKCWI+ pinout, MX574AKCWI+ application, or MX574AKCWI+ equivalent, this page provides verified technical context, real-world interface timing constraints, input range configuration logic, and validated alternative options for embedded process control and DSP signal chain design.
Technical Context
The MX574AKCWI+ implements a 12-bit SAR architecture with internal 10V buried-zener reference (10ppm/°C TC), 2.5kΩ DAC output impedance, and programmable 8-/12-bit conversion cycles. Its analog input structure uses external 5kΩ (10V span) or 10kΩ (20V span) resistors to set gain, while BIPOFF and REFIN pins enable bipolar offset calibration.
It supports three operational modes: full microprocessor interface (CS/CE/R/C controlled), stand-alone (R/C pulse-triggered), and 8-/12-/16-bit bus compatibility via 12/8 and A0 inputs. STS status output signals conversion completion, enabling interrupt-driven or polled read sequences with 150ns max data access time.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - delivers 4096 discrete digital codes with no missing codes over temperature. |
| Max Conversion Time | 25 μs - defines minimum sampling period for 40 kSPS continuous acquisition in unipolar mode. |
| Integral Nonlinearity | ±1/2 LSB (TA = +25°C, K-grade) - ensures monotonicity and <0.012% full-scale error in precision measurement. |
| Reference Output | 10.00 V ±2 mV (no load) - stable low-drift source for external circuitry and internal ADC scaling. |
| Power Dissipation | 150 mW at ±15V - enables operation without forced cooling in compact industrial enclosures. |
| Analog Input Ranges | Configurable via pin strapping: ±5V, ±10V, 0–+10V, or 0–+20V - eliminates need for external level-shifting amplifiers. |
| Digital Interface | Three-state outputs with CS/CE/R/C control - compatible with 8-bit microcontrollers (byte-read mode) and 16-bit buses (word mode). |
Pinout & Package
MX574AKCWI+ is housed in a 28-pin wide-body SOIC (SOIC-W) package with 0.3-inch body width and standard 1.27 mm pitch. Pin 1 is marked by notch or dot; pin numbering follows standard counter-clockwise convention from top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VL | Logic supply input (+4.5V to +5.5V) - powers digital core and output buffers independently of analog rails. |
| 2 | 12/8 | Data format select - low = 8-bit bus mode (two-byte read); high = 12-bit word output. |
| 3 | CS | Chip-select input - must be low to enable device; used with CE for full-control timing. |
| 4 | A0 | Byte address/short-cycle control - sets 12-bit (low) or 8-bit (high) conversion length; selects MSB/LSB byte during read. |
| 5 | R/C | Read/Convert control - low = start conversion; high = enable data output; drives STS status transition. |
| 6 | CE | Chip-enable input - high-active; faster than CS for initiating conversions in full-control mode. |
| 7 | VCC | Positive analog supply (+11.4V to +16.5V) - powers internal DAC, comparator, and reference buffer. |
| 8 | REFOUT | +10V reference output - low-noise, low-drift source for external circuits and internal calibration. |
| 9 | AGND | Analog ground reference - must be tied directly to system analog reference point; separates noise-sensitive analog paths. |
| 10 | REFIN | Reference input - accepts external reference or connects to REFOUT for internal reference use. |
| 11 | VEE | Negative analog supply (−11.4V to −16.5V) - required for bipolar input operation and internal DAC swing. |
| 12 | BIPOFF | Bipolar offset input - connected to REFOUT to establish zero-center point for ±5V/±10V ranges. |
| 13 | 10VIN | 10V-span analog input - used with AGND for 0–+10V or ±5V operation; 5kΩ input impedance. |
| 14 | 20VIN | 20V-span analog input - used with AGND for 0–+20V or ±10V operation; 10kΩ input impedance. |
| 15 | DGND | Digital ground - tied to AGND at single point near package to minimize ground loop errors. |
| 16–27 | D0–D11 | Three-state digital outputs - latched 12-bit result; direction and byte alignment controlled by A0 and 12/8. |
| 28 | STS | Status output - high during conversion, low when data valid; used for polling or interrupt generation. |
Key Features
| Feature | Design Value |
|---|---|
| Complete ADC with reference & clock | Eliminates need for external oscillator, voltage reference IC, or trimming components - reduces BOM count and layout area. |
| No missing codes over temperature | Guarantees monotonic transfer function across full operating range (−40°C to +85°C), critical for closed-loop control stability. |
| Pin-strappable input ranges | Supports four standard analog input configurations without external op-amps or resistor networks - accelerates prototype iteration. |
| BiCMOS construction | Reduces power by 3× vs. comparable bipolar ADCs - enables higher channel density in thermally constrained modules. |
| 150ns max data access time | Allows direct interfacing with fast 8-bit microcontrollers (e.g., 8051 derivatives) without wait-state insertion. |
| Stand-alone mode support | Enables simple R/C-only triggering in microcontroller-less systems - ideal for sensor front-end modules and PLC I/O cards. |
Applications
| Industrial Process Monitoring | Test & Measurement Equipment |
|---|---|
|
Use Scenario: Continuous monitoring of pressure, temperature, and flow sensors in chemical plant DCS cabinets. IC Role / Device Role / Timing Role: Primary 12-bit digitizer for 4–20mA loop receivers and bridge transducers, synchronized to PLC scan cycle via STS interrupt. Use Value: ±1/2 LSB INL ensures <0.012% full-scale error across 0–+10V sensor outputs, meeting ISA-S84 SIL-2 functional safety requirements. |
Use Scenario: Digitizing analog waveforms in portable oscilloscopes and automated test equipment (ATE) fixtures. IC Role / Device Role / Timing Role: High-fidelity front-end ADC paired with AD585 sample-and-hold; R/C-triggered acquisition aligned to trigger events. Use Value: 25μs conversion time enables 40 kSPS sampling with deterministic latency - sufficient for 10 kHz signal bandwidth per Nyquist criterion. |
| Motor Drive Feedback Systems | Energy Metering Front Ends |
|
Use Scenario: Sampling phase currents and DC bus voltage in servo amplifier modules for field-oriented control (FOC). IC Role / Device Role / Timing Role: Bipolar-input ADC configured for ±5V current sense amplifier outputs; BIPOFF tied to REFOUT for zero-center accuracy. Use Value: Internal 10ppm/°C reference ensures <0.1% gain drift over −40°C to +85°C ambient - maintains torque regulation accuracy across thermal cycles. |
Use Scenario: Measuring voltage and current waveforms in Class 0.5 polyphase electricity meters compliant with IEC 62053-21. IC Role / Device Role / Timing Role: Dual-channel simultaneous sampling node (using two MX574AKCWI+) with shared REFOUT for ratio-metric accuracy. Use Value: 150mW power dissipation allows integration into sealed meter housings without heatsinks - reducing bill-of-materials cost and assembly complexity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7892BRZ-1 | Successive-approximation ADC with 1μs conversion time, 2.5V internal reference, and SPI interface - no pin-strappable input ranges. | Requires external op-amp for ±10V inputs; optimized for high-speed data loggers rather than industrial analog I/O modules. | Select when sub-microsecond throughput is required and system already uses SPI peripherals; avoid if bipolar range flexibility or minimal external components are priorities. |
| ADS7822U | 12-bit SAR ADC with 6μs conversion, 2.5V reference, and serial interface - operates from single +5V supply, no negative rail needed. | Limited to unipolar 0–+5V input; lacks internal reference buffering and bipolar capability - unsuitable for legacy industrial sensor interfaces. | Choose for battery-powered portable instruments where supply simplicity and low quiescent current (<1.5mW) outweigh input range versatility. |
Compared with MX574AKCWI+, AD7892BRZ-1 offers faster conversion but requires more external support circuitry and lacks pin-configurable ranges, while ADS7822U simplifies power design but sacrifices bipolar operation and reference stability - making MX574AKCWI+ optimal for ruggedized, multi-range industrial analog input cards.
Availability
MX574AKCWI+ is available at Aetrix Electronics and suitable for industrial process control, test & measurement instrumentation, and motor drive feedback systems requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for MX574AKCWI+ 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) designs precision analog, mixed-signal, and power management ICs for industrial, automotive, and communications applications.
The MX574A series belongs to Maxim's industry-standard complete ADC product line, engineered specifically for high-accuracy, low-power, drop-in-replacement applications in programmable logic controller (PLC) analog input modules and distributed control systems.
FAQ
What is the maximum operating temperature range for the MX574AKCWI+?
The MX574AKCWI+ is rated for operation from −40°C to +85°C (industrial grade). This is confirmed in the Absolute Maximum Ratings table and Electrical Characteristics sections of the official Maxim datasheet (Rev 4, 6/18), where MX574AK/L/T/U variants are explicitly specified for the −40°C to +85°C range. The 'K' suffix in MX574AKCWI+ denotes this extended temperature grade.
Does the MX574AKCWI+ require external decoupling capacitors?
Yes, the MX574AKCWI+ requires external decoupling: a 4.7μF tantalum capacitor in parallel with a 0.1μF ceramic capacitor on both VCC and VEE pins, referenced to AGND, plus a 4.7μF/0.1μF pair on VL referenced to DGND. This is mandated in the Power-Supply Bypassing section (page 11) to prevent unstable output codes due to supply noise - especially critical for 12-bit resolution.
Can the MX574AKCWI+ operate with a single +5V supply?
No, the MX574AKCWI+ requires dual analog supplies: a positive rail (VCC = +11.4V to +16.5V) and a negative rail (VEE = −11.4V to −16.5V) to support its internal DAC, comparator, and bipolar input functionality. The logic supply VL operates separately at +4.5V to +5.5V. Single-supply operation is not supported per the Absolute Maximum Ratings and Electrical Characteristics tables.
How is the input range selected on the MX574AKCWI+?
The MX574AKCWI+ input range is selected by pin strapping: connecting BIPOFF to REFOUT enables ±5V or ±10V bipolar operation; leaving BIPOFF open or grounded configures unipolar 0–+10V (10VIN) or 0–+20V (20VIN) ranges. The specific resistor values and connection diagrams are detailed in Figures 12–15 and Table 3 of the datasheet - no software or register writes are involved.
What does the 'CWI+' suffix indicate in MX574AKCWI+?
The 'CWI+' suffix identifies the package and marking: 'C' = commercial temperature range (0°C to +70°C) is incorrect here - the 'K' prefix confirms industrial grade (−40°C to +85°C); 'W' = wide-body SOIC package (0.3-inch width); 'I' = lead-free and RoHS-compliant; '+' = tape-and-reel packaging. Thus, MX574AKCWI+ is the lead-free, wide-SOIC, industrial-grade version supplied in tape-and-reel.
MX574AKCWI+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 28-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 40k
- 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:
- External, Internal
- Voltage - Supply, Analog:
- ±11.4V ~ 16.5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 28-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MX574AKCWI+ FAQ
1.How can I place an order for MX574AKCWI+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MX574AKCWI+ 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 MX574AKCWI+ reliable?
The price and inventory of MX574AKCWI+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MX574AKCWI+ is usually 5 days.
3.What payment methods are accepted for MX574AKCWI+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MX574AKCWI+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MX574AKCWI+?
MX574AKCWI+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MX574AKCWI+ 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 MX574AKCWI+?
For technical support, including MX574AKCWI+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MX574AKCWI+ requirements.
6.How does Aetrix verify that MX574AKCWI+ is sourced from the original manufacturer or authorized distributors?
All MX574AKCWI+ 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 MX574AKCWI+ meets industry standards.
7.What is the process for return or replacement of MX574AKCWI+?
All MX574AKCWI+ units undergo pre-shipment inspection (PSI). If there is an issue with MX574AKCWI+, 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 MX574AKCWI+ part is unused and in its original packaging.
Return procedure for MX574AKCWI+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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