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Analog Devices Inc./Maxim Integrated MX574AKEWI+
- Part No.:
- MX574AKEWI+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MX574AKEWI+.pdf
- Description:
- IC ADC 12BIT W/REF 28-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,440
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Product details
Overview
MX574AKEWI+ from Maxim Integrated is a monolithic 12-bit successive-approximation ADC with integrated buried-zener reference (10V ±2mV), internal clock, and BiCMOS process. It delivers 25μs max conversion time, ±1/2 LSB integral nonlinearity at +25°C, and supports ±5V/±10V bipolar or 0–+10V/0–+20V unipolar input ranges via pin strapping. It is used in high-accuracy industrial data acquisition systems requiring stable on-chip reference and microprocessor-compatible 8-/12-/16-bit bus interfacing.
For engineers reviewing the MX574AKEWI+ datasheet, MX574AKEWI+ pinout, MX574AKEWI+ application, or MX574AKEWI+ equivalent, key selection criteria include its 25μs conversion time, ±1/2 LSB INL over temperature, 10ppm/°C reference drift, 150mW power dissipation, and compatibility with ±12V/±15V dual supplies and +5V logic interface.
Technical Context
The MX574AKEWI+ implements a 12-bit SAR architecture with an internal 2.5kΩ-output-impedance DAC and zero-crossing comparator. Conversion is initiated by R/C low pulse in stand-alone mode or CE/CS-controlled full-control mode, with status indicated by STS output. The internal 10V reference provides low-noise, low-drift performance without external trimming for most applications.
It supports flexible digital interfacing: 12/8 pin selects 12-bit word or split 8-bit byte output; A0 controls MSB/LSB byte selection during reads and 12-/8-bit conversion length during starts. Input range configuration is achieved solely through external pin strapping-no register programming required-making it suitable for fixed-function embedded measurement nodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - delivers 4096 discrete codes with no missing codes over full operating temperature range. |
| Max Conversion Time | 25 μs - defines minimum sampling period for real-time control loops with ≤40 kSPS throughput. |
| Integral Nonlinearity | ±1/2 LSB (typ.) - ensures end-point accuracy within ±0.012% of full scale, critical for calibration-grade instrumentation. |
| Reference Output | 10.00 V ±2 mV (no load) - precision internal zener reference eliminates need for external voltage reference ICs. |
| Power Dissipation | 150 mW at ±15V supplies - enables operation in thermally constrained industrial enclosures without forced cooling. |
| Analog Input Range | Selectable ±5V, ±10V, 0–+10V, or 0–+20V - accommodates diverse sensor outputs (e.g., strain gauges, RTDs, LVDTs) without signal conditioning. |
| Digital Interface | Three-state parallel outputs (D0–D11), CS/CE/R/C/12/8/A0 control - directly interfaces to 8-bit microcontrollers (byte mode) or 16-bit processors (word mode). |
Pinout & Package
MX574AKEWI+ is supplied in a 28-pin wide-body SOIC (SOIC-W) package with 0.300-inch body width and standard JEDEC MO-013AC outline. Pin spacing is 0.050 inch, and the package is RoHS-compliant and Pb-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VL) | Logic supply input | +5V digital interface supply; must be decoupled locally to DGND to prevent digital noise coupling into analog section. |
| 3 (CS), 6 (CE) | Chip select / chip enable | CS enables device when low; CE enables read/convert when high - both required active for full bus control; CE preferred for faster timing. |
| 5 (R/C) | Read/Convert control | Low = start conversion; high = enable data read - also serves as primary control in stand-alone mode. |
| 8 (REFOUT) | Internal reference output | 10V ±2mV source for BIPOFF and REFIN; capable of driving 2mA total load including external circuitry. |
| 9 (AGND), 15 (DGND) | Analog/digital ground | Must be connected at single point near package; AGND is reference for internal DAC and comparator - separation prevents ground bounce errors. |
| 12 (BIPOFF) | Bipolar offset input | Connected to REFOUT for ±5V/±10V operation; sets midpoint of bipolar transfer function; adjustable via external resistor network. |
| 13 (10VIN), 14 (20VIN) | Analog input terminals | 10VIN accepts 0–+10V or ±5V; 20VIN accepts 0–+20V or ±10V - input impedance is 5kΩ (10VIN) or 10kΩ (20VIN); unused pin must be left open. |
| 16–27 (D0–D11) | Three-state data outputs | 12-bit parallel output; latched after conversion; controlled by CE/R/C to avoid bus contention during conversion. |
| 28 (STS) | Status output | Active-high open-drain signal indicating conversion in progress; used for polling or interrupt generation - transitions low at conversion completion. |
Key Features
| Feature | Design Value |
|---|---|
| Complete ADC with on-chip clock and reference | Eliminates external oscillator and reference ICs - reduces BOM count, PCB area, and calibration complexity in embedded DAQ modules. |
| No missing codes over temperature | Guarantees monotonicity across –40°C to +85°C - essential for closed-loop control where code reversals cause instability. |
| 150ns maximum data access time | Enables direct connection to fast 8-bit microcontrollers (e.g., Intel 8051 derivatives) without wait states or glue logic. |
| Versatile analog input structure | Single device supports four input ranges via pin strapping - simplifies design reuse across sensor types without hardware redesign. |
| Monolithic BiCMOS construction | Reduces power vs. bipolar-only ADCs by 3× (150mW vs. ~450mW) - improves thermal stability and enables higher channel density in modular I/O systems. |
Applications
| Industrial Process Monitoring | Test & Measurement Equipment |
|---|---|
|
Use Scenario: Continuous monitoring of pressure, temperature, and flow transmitters in PLC-based control cabinets. IC Role / Device Role / Timing Role: Primary analog front-end digitizer converting 4–20mA loop signals (via precision shunt) into 12-bit digital values for real-time PID execution. Use Value: ±1/2 LSB INL and 10ppm/°C reference drift ensure <±0.02% FS accuracy over ambient temperature swings - meeting ISA-S50.1 Class B requirements. |
Use Scenario: Benchtop multimeters and automated test equipment requiring calibrated DC voltage measurement. IC Role / Device Role / Timing Role: High-stability ADC core in 4½-digit DMM architectures, paired with precision track-and-hold (e.g., AD585) for accurate sampling. Use Value: Internal 10V reference eliminates external reference drift contribution; 25μs conversion time supports ≥30k samples/sec sweep modes without interpolation. |
| Motor Drive Current Sensing | Electro-Mechanical Actuator Control |
|
Use Scenario: Isolated phase current feedback in servo drives using shunt resistors and isolated amplifiers. IC Role / Device Role / Timing Role: Digitizing amplified shunt voltage with ±5V bipolar input range; synchronized to PWM carrier via R/C trigger for deterministic sampling. Use Value: Stand-alone R/C mode enables precise timing alignment with gate driver dead-time; 150mW dissipation avoids thermal derating in compact drive modules. |
Use Scenario: Position and force feedback in robotic joint controllers using potentiometers and load cells. IC Role / Device Role / Timing Role: Simultaneous digitization of multiple analog sensors (position, torque, temperature) in multi-channel acquisition subsystems. Use Value: Pin-strapped input flexibility allows one PCB layout to support 0–10V pot wipers and ±10V load cell bridges - reducing variant SKUs and inventory costs. |
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 |
|---|---|---|---|
| AD7892BRZ-1 | 2µs conversion time, 5V single supply, no internal reference - requires external 2.5V ref; 12-bit, ±1 LSB INL. | Optimized for low-latency, battery-powered portable instruments; lacks bipolar input support and on-chip clock. | Select when ultra-fast sampling (>400 kSPS) and single-supply operation outweigh need for integrated reference and bipolar range. |
| ADS7822U | 2.5μs conversion, SPI interface, 5V supply, internal reference - 12-bit, ±0.5 LSB INL, but only unipolar 0–VREF input. | Suited for microcontroller-based systems with limited GPIO; no parallel bus or bipolar capability. | Choose for space-constrained designs needing serial interface and lower power (12mW), accepting loss of ±V input and parallel throughput. |
Compared with AD7892BRZ-1 and ADS7822U, MX574AKEWI+ offers unique integration of bipolar input support, on-chip 10V reference, and parallel microprocessor interface - making it optimal for industrial rack-mounted DAQ where reliability, calibration stability, and bus compatibility are prioritized over raw speed or footprint.
Availability
MX574AKEWI+ is available at Aetrix Electronics and suitable for industrial process monitoring, test & measurement equipment, and motor drive current sensing requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for MX574AKEWI+ 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, automotive, and communications markets.
The MX574A series belongs to Maxim's industry-standard complete ADC product line, designed specifically for embedded instrumentation and control systems where integration of reference, clock, and interface logic reduces system-level design risk and time-to-market.
FAQ
What is the maximum operating temperature range for the MX574AKEWI+?
The MX574AKEWI+ is rated for operation from –40°C to +85°C (industrial grade). This is confirmed in the Electrical Characteristics table under "Operating Temperature Ranges" for MX_74AJE/KE/LE variants, which includes the KE suffix in MX574AKEWI+. The device maintains ±1/2 LSB INL and 10ppm/°C reference stability across this full range, enabling deployment in harsh factory-floor environments without derating.
Does the MX574AKEWI+ require external components for basic operation?
Yes, but minimally: only decoupling capacitors (0.1µF ceramic + 4.7µF tantalum per supply rail) and fixed resistors (50Ω between REFOUT and REFIN/BIPOFF for bipolar operation) are required. The MX574AKEWI+ integrates clock, 10V reference, and SAR core - eliminating need for external oscillator, reference IC, or timing logic. No trimming potentiometers are needed for standard ±5V or 0–+10V use.
How does the MX574AKEWI+ handle bipolar versus unipolar input configurations?
The MX574AKEWI+ uses pin strapping - not registers - to configure input range. For bipolar (±5V/±10V), connect BIPOFF to REFOUT and apply signal to 10VIN or 20VIN. For unipolar (0–+10V/0–+20V), tie BIPOFF to AGND and apply signal to same input pin. Coding is offset binary for bipolar, straight binary for unipolar - both defined in Table 3 of the datasheet with exact transition voltages.
Can the MX574AKEWI+ interface directly with an 8-bit microcontroller bus?
Yes. With 12/8 pin low, the MX574AKEWI+ outputs data in two 8-bit bytes: A0 low enables the high byte (D11–D4), A0 high enables the low byte (D3–D0 padded with four zeros). This eliminates need for external latches or bus transceivers. The 150ns access time and three-state outputs ensure clean timing with common 8-bit MCUs like the 8051 or PIC18F without wait states.
What is the purpose of the STS pin on the MX574AKEWI+?
The STS (Status) pin is an active-high, open-drain output that goes high at conversion start and returns low upon completion. It provides hardware handshaking for microprocessors - enabling either polling (checking STS before reading data) or interrupt-driven operation (using STS edge to trigger ISR). Its timing is guaranteed to 320ns max delay from CE assertion, ensuring deterministic synchronization in real-time systems.
MX574AKEWI+ 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:
- -40°C ~ 85°C
- Supplier Device Package:
- 28-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MX574AKEWI+ FAQ
1.How can I place an order for MX574AKEWI+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MX574AKEWI+ 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 MX574AKEWI+ reliable?
The price and inventory of MX574AKEWI+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MX574AKEWI+ is usually 5 days.
3.What payment methods are accepted for MX574AKEWI+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MX574AKEWI+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MX574AKEWI+?
MX574AKEWI+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MX574AKEWI+ 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 MX574AKEWI+?
For technical support, including MX574AKEWI+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MX574AKEWI+ requirements.
6.How does Aetrix verify that MX574AKEWI+ is sourced from the original manufacturer or authorized distributors?
All MX574AKEWI+ 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 MX574AKEWI+ meets industry standards.
7.What is the process for return or replacement of MX574AKEWI+?
All MX574AKEWI+ units undergo pre-shipment inspection (PSI). If there is an issue with MX574AKEWI+, 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 MX574AKEWI+ part is unused and in its original packaging.
Return procedure for MX574AKEWI+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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