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Analog Devices Inc./Maxim Integrated MX574ASQ
- Part No.:
- MX574ASQ
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-CDIP (0.600", 15.24mm)
- Datasheet:
-
MX574ASQ.pdf
- Description:
- MX574 12-BIT ADC
- Quantity:
- Payment:
- Shipping:
Inventory:2,715
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Product details
Overview
MX574ASQ from Maxim Integrated is a monolithic 12-bit successive-approximation ADC with integrated buried-zener reference (10V ±20mV), internal clock, and BiCMOS process. It delivers 25μs max conversion time, ±1/2 LSB integral nonlinearity at +25°C (MX574AK/L/T/U variants), 150mW power dissipation at ±15V supplies, and supports pin-strappable unipolar (0 to +10V/+20V) or bipolar (±5V/±10V) input ranges. It is used in high-accuracy process control systems requiring stable on-chip reference and minimal external components.
For engineers reviewing the MX574ASQ datasheet, MX574ASQ pinout, MX574ASQ application, or MX574ASQ equivalent, this page provides verified technical context, exact pin functions, real-world interface timing constraints, confirmed analog input configuration options, and validated alternative parts for 12-bit industrial data acquisition.
Technical Context
The MX574ASQ implements a 12-bit successive approximation register (SAR) architecture with a 2.5kΩ-output-impedance internal DAC and zero-crossing comparator. Its conversion cycle is fully self-contained-no external clock or reference required-and uses a 5kΩ/10kΩ resistor network for 10V/20V span selection at the analog inputs.
It supports three operational modes: full microprocessor interface (using CS, CE, R/C, A0, and 12/8), 8-bit bus interleaved read (A0 toggles MSB/LSB byte), and stand-alone mode (R/C pulse-triggered). Timing is governed by internal ~600kHz clock; STS output signals conversion completion with 250ns max delay after CE assertion.
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 continuous acquisition at ≤40 kSPS. |
| Integral Nonlinearity | ±1/2 LSB (TYP at +25°C, MX574AK/L/T/U grade) - ensures monotonicity and <0.012% full-scale linearity error. |
| Reference Output | 10.00 V ±20 mV (no load) - precision low-drift (10 ppm/°C) buried zener enables calibration-free operation in stable environments. |
| Power Dissipation | 150 mW at ±15V - BiCMOS construction reduces thermal load vs. older bipolar ADCs, easing heatsink requirements. |
| Analog Input Ranges | 0 to +10V, 0 to +20V, ±5V, ±10V - selected via pin strapping (BIPOFF, 10VIN, 20VIN); no external op-amp needed for range scaling. |
| Digital Interface | Three-state parallel outputs (D0–D11), 8-/12-/16-bit bus compatible - eliminates need for external latches or level shifters in embedded microcontroller designs. |
Pinout & Package
MX574ASQ is available in 28-pin SOIC (Small Outline Integrated Circuit) package with standard 0.3-inch body width and gull-wing leads. Pin spacing is 0.05 inch (1.27 mm), compliant with JEDEC MS-012AC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VL | Logic supply input (+4.5V to +5.5V) - powers digital core and output buffers; decoupling to DGND essential for noise immunity. |
| 2 | 12/8 | Data format select - low = 8-bit bus mode (MSB/LSB split), high = 12-bit word output; determines software data-handling overhead. |
| 3 | CS | Chip-select input - must be low to enable device; used with CE/R/C for full bus arbitration in multi-peripheral systems. |
| 4 | A0 | Byte address/short-cycle control - sets 12-bit (low) or 8-bit (high) conversion length; also selects MSB/LSB byte during read in 8-bit mode. |
| 5 | R/C | Read/Convert control - low = start conversion, high = enable data read; dual-role signal simplifies GPIO usage in stand-alone mode. |
| 6 | CE | Chip-enable input - high-active enable; faster propagation than CS, preferred for timing-critical conversion triggers. |
| 7 | VCC | Positive analog supply (+11.4V to +16.5V) - powers SAR, DAC, and reference; requires 4.7μF + 0.1μF decoupling to AGND. |
| 8 | REFOUT | +10V reference output - drives REFIN and BIPOFF; can source up to 2mA (±15V supplies), enabling direct bipolar offset setup. |
| 9 | AGND | Analog ground reference - star-point connection for REFOUT, REFIN, BIPOFF, and analog inputs; must tie to system analog ground. |
| 10 | REFIN | Reference input - accepts internal REFOUT or external reference; 50Ω resistor to REFOUT sets bipolar offset point. |
| 11 | VEE | Negative analog supply (−16.5V to −11.4V) - powers comparator and analog front-end; decoupling to AGND critical for noise rejection. |
| 12 | BIPOFF | Bipolar offset input - tied to REFOUT for ±5V/±10V operation; adjusts zero point without trimming resistors in calibrated grades. |
| 13 | 10VIN | 10V-span analog input - connects to signal source for 0 to +10V or ±5V ranges; 5kΩ input impedance limits drive requirements. |
| 14 | 20VIN | 20V-span analog input - used for 0 to +20V or ±10V ranges; 10kΩ input impedance allows higher-voltage signal conditioning. |
| 15 | DGND | Digital ground - ties to VL and digital logic; joined to AGND at single point under package to minimize ground bounce errors. |
| 16–27 | D0–D11 | Three-state data outputs - driven only when CE and R/C are high; high-impedance state prevents bus contention during conversion. |
| 28 | STS | Status output - open-drain, active-high during conversion; used for polling or interrupt generation to synchronize host CPU reads. |
Key Features
| Feature | Design Value |
|---|---|
| Complete ADC with on-chip clock & reference | Eliminates external crystal oscillator and precision voltage reference ICs, reducing BOM count and layout area by ≥3 components. |
| No missing codes over temperature | Guarantees monotonic transfer function across −40°C to +85°C, critical for closed-loop control where code reversals cause instability. |
| 150 ns max data access time | Enables direct interfacing to 8-MHz Z80 or 12-MHz 8051 microcontrollers without wait states, simplifying firmware timing loops. |
| Pin-strappable input ranges | Supports four standard industrial voltage ranges without external op-amps or resistor networks-reduces calibration complexity and test time. |
| Stand-alone mode via R/C pulse | Allows use in simple PLC I/O modules or sensor transmitters without full microprocessor bus, cutting firmware development effort. |
Applications
| Industrial Process Monitoring | Test & Measurement Equipment |
|---|---|
|
Use Scenario: Continuous monitoring of pressure, temperature, and flow sensors in chemical plant DCS cabinets with 4–20mA loop interfaces. IC Role / Device Role / Timing Role: Primary analog-to-digital converter digitizing conditioned sensor outputs at 10–50 kSPS with deterministic 25μs latency. Use Value: On-chip 10V reference and ±1/2 LSB INL ensure <0.02% total measurement uncertainty without field recalibration. |
Use Scenario: Digitizing waveform inputs in portable oscilloscopes and automated test fixtures requiring DC-coupled, wide-dynamic-range capture. IC Role / Device Role / Timing Role: High-fidelity front-end ADC capturing ±10V signals with offset binary coding for bipolar signal analysis. Use Value: Pin-strappable ±10V range and buried-zener reference deliver consistent full-scale accuracy across instrument lifetime. |
| Motor Drive Feedback Systems | Energy Metering Modules |
|
Use Scenario: Sampling phase currents and DC bus voltage in servo amplifier boards for real-time torque and flux estimation. IC Role / Device Role / Timing Role: Simultaneous-sampling-capable ADC (with external track-and-hold) providing synchronized current/voltage snapshots. Use Value: 25μs conversion time enables >30 kHz current loop update rates; 150mW dissipation avoids thermal derating in compact enclosures. |
Use Scenario: Measuring utility voltage and current waveforms in Class 0.5 smart meters using isolated sigma-delta front-ends with precision gain stages. IC Role / Device Role / Timing Role: Calibration reference ADC validating metrology ASIC performance during production test and field verification. Use Value: 10 ppm/°C reference drift and ±1 LSB DNL ensure long-term meter accuracy compliance per IEC 62053-21. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7874JRZ | 12-bit SAR ADC with 10V reference, 10μs conversion, but requires external clock and separate reference buffer; 24-pin SOIC. | Higher speed but greater external component count; less suitable for space-constrained or low-BOM-cost designs. | Select AD7874JRZ only if sub-10μs conversion is mandatory and board area permits added passives. |
| MAX1166BCAP+ | 12-bit SAR ADC with internal reference and 2.5μs conversion, but 16-pin TSSOP, no bipolar input support, and 0–5V unipolar only. | Limited to unipolar sensing; lacks pin-strappable ±5V/±10V capability and cannot replace MX574ASQ in legacy bipolar designs. | Choose MAX1166BCAP+ for new compact designs needing faster throughput and accepting unipolar-only input constraints. |
Compared with AD7874JRZ and MAX1166BCAP+, the MX574ASQ uniquely combines pin-strappable bipolar/unipolar ranges, integrated 10V reference, and 25μs conversion in a 28-pin SOIC-making it the only drop-in replacement for existing industrial data acquisition boards requiring ±10V full-scale support.
Availability
MX574ASQ is available at Aetrix Electronics and suitable for industrial process monitoring, test & measurement equipment, motor drive feedback systems, and energy metering modules requiring stable component supply and long-term obsolescence management.
Supply support for MX574ASQ 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 U.S.-based 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 industrial data acquisition systems requiring minimal external components, guaranteed monotonicity, and robust operation across extended temperature ranges.
FAQ
What is the maximum operating temperature range for the MX574ASQ?
The MX574ASQ 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 for MX574AJ/K/S/T variants. The MX574ASQ suffix corresponds to the MX574AJ grade, which guarantees full specification compliance-including ±1 LSB INL and 25μs conversion time-across this entire range.
Does the MX574ASQ require an external clock source?
No, the MX574ASQ does not require an external clock source. It contains a fully integrated oscillator circuit that generates the internal ~600kHz conversion clock. This is explicitly stated in the General Description ("on-chip clock") and confirmed in the Functional Diagram and Timing Characteristics sections, where all tCONV and timing parameters are specified without external clock dependencies.
Can the MX574ASQ be used with a 3.3V logic interface?
No, the MX574ASQ cannot be directly interfaced to a 3.3V logic system. Its VL pin requires +4.5V to +5.5V, and digital outputs (D0–D11, STS) swing from 0V to VL (min 4.5V). Driving 3.3V-tolerant inputs would require level-shifting circuitry, as the datasheet specifies VOH ≥4.0V (at ISOURCE = 500µA) and VOL ≤0.4V-both incompatible with 3.3V logic thresholds.
How is the bipolar input range configured on the MX574ASQ?
The bipolar input range (±5V or ±10V) on the MX574ASQ is configured by connecting BIPOFF to REFOUT and selecting either 10VIN (for ±5V) or 20VIN (for ±10V) as the analog input node. This is detailed in the Pin Description, Input Configurations section, and Figure 15. No external resistors are needed beyond the 50Ω fixed resistor between REFOUT and REFIN, as specified in Note 2.
What is the purpose of the STS pin on the MX574ASQ?
The STS (Status) pin on the MX574ASQ is an open-drain, active-high output that goes high at conversion start and returns low upon completion. It provides hardware synchronization for the host processor-enabling polling or interrupt-driven data reads without fixed delay loops. Its 250ns max delay (tDSC) and 20ns min pulse width (tHDR) are characterized in the Timing Characteristics table for reliable timing design.
MX574ASQ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 28-CDIP (0.600", 15.24mm)
- Packaging:
- Bulk
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- -
- 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 ~ -15.75V, 4.75V ~ 5.25V
- Voltage - Supply, Digital:
- -11.4V ~ -15.75V, 4.75V ~ 5.25V
- Features:
- -
- Operating Temperature:
- -55°C ~ 125°C
- Supplier Device Package:
- 28-CERDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
MX574ASQ FAQ
1.How can I place an order for MX574ASQ through Aetrix?
Please submit a Request for Quotation (RFQ) for MX574ASQ 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 MX574ASQ reliable?
The price and inventory of MX574ASQ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MX574ASQ is usually 5 days.
3.What payment methods are accepted for MX574ASQ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MX574ASQ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MX574ASQ?
MX574ASQ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MX574ASQ 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 MX574ASQ?
For technical support, including MX574ASQ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MX574ASQ requirements.
6.How does Aetrix verify that MX574ASQ is sourced from the original manufacturer or authorized distributors?
All MX574ASQ 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 MX574ASQ meets industry standards.
7.What is the process for return or replacement of MX574ASQ?
All MX574ASQ units undergo pre-shipment inspection (PSI). If there is an issue with MX574ASQ, 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 MX574ASQ part is unused and in its original packaging.
Return procedure for MX574ASQ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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