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Analog Devices Inc./Maxim Integrated MX574AJEWI+
- Part No.:
- MX574AJEWI+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MX574AJEWI+.pdf
- Description:
- IC ADC 12BIT SAR 28SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,427
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Product details
Overview
MX574AJEWI+ from Maxim Integrated is a complete 12-bit successive-approximation analog-to-digital converter (ADC) with on-chip buried-zener voltage reference and internal clock. It delivers 25μs max conversion time, ±1 LSB integral nonlinearity at +25°C, 150mW power dissipation, and supports ±5V/±10V bipolar or 0–+10V/0–+20V unipolar input ranges via pin strapping - used in high-accuracy process control systems requiring stable, self-contained data acquisition.
For engineers reviewing the MX574AJEWI+ datasheet, MX574AJEWI+ pinout, MX574AJEWI+ application, or MX574AJEWI+ equivalent, this page provides verified technical context, real-world interface timing, input range configuration logic, and validated alternative options for industrial ADC selection.
Technical Context
The MX574AJEWI+ employs a monolithic BiCMOS SAR architecture with internal 10V precision reference (10ppm/°C drift), enabling direct analog input sampling without external reference or clock circuitry. Its analog front-end supports selectable 10V/20V span inputs and bipolar offset adjustment via REFIN/BIPOFF pins, with input impedance of 5kΩ (10VIN) or 10kΩ (20VIN).
Digital interface uses three-state outputs controlled by CS, CE, and R/C logic, supporting 8-bit, 12-bit, and 16-bit bus widths via 12/8 and A0 pins. Conversion start and data read are decoupled: R/C low initiates conversion; R/C high enables output access, with STS indicating busy status and completion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete digital codes with no missing codes over temperature. |
| Max Conversion Time | 25μs - defines minimum sampling period for real-time control loops with ≤40kHz effective throughput. |
| Integral Nonlinearity | ±1 LSB (TA = +25°C) - ensures monotonicity and ≤0.024% full-scale error in calibrated systems. |
| Reference Output | 10.00V ±20mV (no load) - stable internal zener source eliminates need for external reference IC or trimming. |
| Power Dissipation | 150mW at ±15V supplies - enables operation in thermally constrained industrial enclosures without forced cooling. |
| Analog Input Ranges | Pin-strappable: 0 to +10V, 0 to +20V, ±5V, or ±10V - supports direct sensor interfacing without external level-shifting. |
| Supply Voltages | VCC = +11.4V to +16.5V; VEE = –16.5V to –11.4V; VL = +4.5V to +5.5V - compatible with standard ±15V/5V industrial rails. |
Pinout & Package
MX574AJEWI+ is packaged in a 28-pin wide-body SOIC (SOIC-W) with 0.300-inch body width and standard JEDEC MS-013AC footprint. Pin spacing is 0.050 inch, lead finish is matte tin, and package meets RoHS requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VL | Logic supply input (+5V) - powers digital core and output buffers; must be decoupled to DGND with 0.1μF ceramic + 4.7μF tantalum. |
| 2 | 12/8 | Data mode select - low configures 8-bit bus interface (two-byte read); high enables 12-bit word output. |
| 3 | CS | Chip-select input - active-low enable; must be asserted with CE for valid control cycle; ignored if CE is inactive. |
| 4 | A0 | Byte address/short-cycle input - sets conversion length (low = 12-bit, high = 8-bit) and selects MSB/LSB byte during read. |
| 5 | R/C | Read/Convert control - low = initiate conversion; high = enable data output; STS transitions indicate state change. |
| 6 | CE | Chip-enable input - active-high; primary control for timing-critical operations; faster propagation than CS. |
| 7 | VCC | Positive analog supply (+12V or +15V) - powers internal DAC, reference, and analog circuitry; requires local decoupling to AGND. |
| 8 | REFOUT | +10V reference output - drives REFIN and BIPOFF; can source up to 2mA with ±15V supplies; not buffered for external loads under ±12V. |
| 9 | AGND | Analog ground - reference point for internal reference and analog inputs; must be tied directly to system analog ground plane. |
| 10 | REFIN | Reference input - accepts external reference or connects to REFOUT for internal reference use; 50Ω resistor required for bipolar offset calibration. |
| 11 | VEE | Negative analog supply (–12V or –15V) - powers comparator and analog front-end; decouple to AGND with same capacitor network as VCC. |
| 12 | BIPOFF | Bipolar offset input - connects to REFOUT for ±5V/±10V ranges; adjustable via external trimmer for zero-point calibration. |
| 13 | 10VIN | 10V-span analog input - used with 0 to +10V or ±5V ranges; nominal input impedance 5kΩ; keep trace short to minimize noise. |
| 14 | 20VIN | 20V-span analog input - used with 0 to +20V or ±10V ranges; nominal input impedance 10kΩ; leave floating when using 10VIN. |
| 15 | DGND | Digital ground - return for VL and digital outputs; connected to AGND at single point near package for optimal noise rejection. |
| 16–27 | D0–D11 | Three-state data outputs - latched 12-bit result; output format determined by 12/8 and A0; high-impedance when CE low or R/C low. |
| 28 | STS | Status output - active-high open-drain signal indicating conversion in progress; used for polling or interrupt generation. |
Key Features
| Feature | Design Value |
|---|---|
| Complete ADC with reference and clock | Eliminates need for external oscillator, reference IC, or trimming resistors - reduces BOM count and layout area by ≥4 components. |
| No missing codes over temperature | Guarantees monotonic transfer function across –40°C to +85°C operating range - critical for closed-loop control integrity. |
| 150ns maximum data access time | Enables direct connection to 8MHz microprocessor buses without wait states - supports real-time data streaming in PLC I/O modules. |
| Pin-strappable input ranges | Supports four standard analog input configurations (0–+10V, 0–+20V, ±5V, ±10V) via hardwired pin connections - no firmware reconfiguration needed. |
| BiCMOS construction | Reduces power vs. comparable bipolar ADCs by 3× (150mW vs. ~450mW) - lowers thermal stress in dense industrial PCB layouts. |
Applications
| Industrial Process Monitoring | Automated Test Equipment (ATE) |
|---|---|
|
Use Scenario: Continuous monitoring of pressure, temperature, and flow sensors in chemical plant DCS cabinets with ±15V/5V power rails. IC Role / Device Role / Timing Role: Primary 12-bit ADC digitizing 4–20mA loop signals conditioned by op-amps; STS synchronizes microcontroller reads to conversion completion. Use Value: Internal 10V reference and pin-strapped ±5V input eliminate calibration drift and external component dependencies, improving long-term measurement stability. |
Use Scenario: High-speed parametric testing of semiconductor devices requiring precise voltage/current sampling at 40kSPS. IC Role / Device Role / Timing Role: Stand-alone mode ADC triggered by R/C pulse; 25μs conversion time enables tight test cycle timing with minimal software overhead. Use Value: 150ns access time and three-state outputs allow direct connection to FPGA-based pattern generators without glue logic or bus transceivers. |
| Motor Drive Current Sensing | Power Quality Analyzers |
|
Use Scenario: Isolated current sensing in servo drive inverters using shunt resistors and isolated amplifiers with ±10V output swing. IC Role / Device Role / Timing Role: Bipolar ADC capturing bidirectional motor phase currents; 12-bit resolution resolves <5mA increments at 50A full scale. Use Value: ±10V input range and internal reference ensure accurate zero-crossing detection and harmonic distortion analysis without gain/offset recalibration. |
Use Scenario: Simultaneous voltage and current sampling in portable PQ meters measuring THD, flicker, and harmonics per IEC 61000-4-30. IC Role / Device Role / Timing Role: Dual-channel acquisition subsystem (two MX574AJEWI+) synchronized via shared R/C and clock; 25μs conversion supports 20kHz Nyquist bandwidth. Use Value: Matched INL (±1 LSB) and temperature-stable reference enable consistent inter-channel gain/phase matching across operating temperature. |
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 | 12-bit SAR ADC with 1μs conversion time, external reference required, 5V-only supply, SPI interface. | Higher speed but lacks integrated reference and bipolar input support; requires external op-amp for ±10V scaling. | Select AD7892BRZ-1 only when >1MSPS sampling is required and system already provides precision reference and signal conditioning. |
| ADS7800U | 12-bit SAR ADC with 10μs conversion, internal reference, ±5V analog supply, parallel 12-bit bus interface. | Similar pin-compatible layout but uses single +5V digital supply (no VL pin); lower power (100mW) but limited to 0–+10V unipolar input. | Choose ADS7800U for cost-sensitive 0–+10V sensor interfaces where dual-supply analog section is not available. |
Compared with AD7892BRZ-1 and ADS7800U, MX574AJEWI+ uniquely combines integrated ±15V analog supplies, pin-strappable bipolar/unipolar ranges, and buried-zener reference in a single SOIC package - reducing design complexity for industrial-grade data acquisition where supply flexibility and calibration stability are prioritized over raw speed.
Availability
MX574AJEWI+ is available at Aetrix Electronics and suitable for industrial process control, automated test equipment, motor drive current sensing, and power quality analyzers requiring stable component supply and long-term obsolescence management.
Supply support for MX574AJEWI+ 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 legacy high-accuracy data acquisition product line, engineered specifically for industrial environments demanding self-contained, temperature-stable ADC functionality without external support components.
FAQ
What is the maximum conversion time specification for MX574AJEWI+?
The MX574AJEWI+ has a maximum conversion time of 25μs at +25°C, with typical performance at 20μs. This value is guaranteed across the –40°C to +85°C industrial temperature range. The timing is measured from R/C falling edge to STS deassertion and applies to full 12-bit conversions. For 8-bit cycles, the max time is 18μs - useful for reduced-resolution, higher-throughput applications where LSBs are discarded in firmware.
Does MX574AJEWI+ require external components to operate?
MX574AJEWI+ requires only decoupling capacitors (0.1μF ceramic + 4.7μF tantalum per supply rail) and fixed resistors for calibration (50Ω between REFOUT and REFIN/BIPOFF). No external clock, reference IC, or trimming potentiometers are needed for basic operation. Pin strapping determines input range; no external op-amps are required for standard ±5V/0–+10V interfacing, though a track-and-hold is recommended for signals above a few Hz.
How does the MX574AJEWI+ support bipolar input ranges?
The MX574AJEWI+ supports ±5V and ±10V bipolar inputs via pin strapping: connect BIPOFF to REFOUT and apply signal to 10VIN (for ±5V) or 20VIN (for ±10V). Internal circuitry uses offset binary coding, where 0000 0000 0000 = –FS and 1111 1111 1111 = +FS – 1 LSB. Calibration adjusts zero point via BIPOFF and full scale via REFIN using external 50Ω resistors - no firmware changes are needed to switch between unipolar and bipolar modes.
What is the operating temperature range for MX574AJEWI+?
The MX574AJEWI+ is rated for –40°C to +85°C operation (industrial grade), confirmed by its "J" suffix per Maxim's ordering nomenclature. Electrical specifications including INL (±1 LSB), conversion time (25μs max), and reference drift (10ppm/°C) are guaranteed across this full range. The device uses BiCMOS process technology to maintain parameter stability, and thermal derating begins above +75°C at 10mW/°C for power dissipation.
Can MX574AJEWI+ interface directly with an 8-bit microcontroller bus?
Yes - MX574AJEWI+ supports native 8-bit bus interfacing via the 12/8 pin. When 12/8 = low, data is output left-justified: A0 = low enables D8–D11 on D0–D3 (MSB byte), and A0 = high enables D0–D3 on D0–D3 (LSB byte with trailing zeros). No external latches or transceivers are needed. CE and R/C coordinate handshaking, while STS provides ready indication - enabling seamless integration with 8051, PIC18, or ARM Cortex-M0+ controllers using standard memory-mapped I/O.
MX574AJEWI+ 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:
- -
MX574AJEWI+ FAQ
1.How can I place an order for MX574AJEWI+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MX574AJEWI+ 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 MX574AJEWI+ reliable?
The price and inventory of MX574AJEWI+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MX574AJEWI+ is usually 5 days.
3.What payment methods are accepted for MX574AJEWI+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MX574AJEWI+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MX574AJEWI+?
MX574AJEWI+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MX574AJEWI+ 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 MX574AJEWI+?
For technical support, including MX574AJEWI+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MX574AJEWI+ requirements.
6.How does Aetrix verify that MX574AJEWI+ is sourced from the original manufacturer or authorized distributors?
All MX574AJEWI+ 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 MX574AJEWI+ meets industry standards.
7.What is the process for return or replacement of MX574AJEWI+?
All MX574AJEWI+ units undergo pre-shipment inspection (PSI). If there is an issue with MX574AJEWI+, 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 MX574AJEWI+ part is unused and in its original packaging.
Return procedure for MX574AJEWI+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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