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Analog Devices Inc./Maxim Integrated MAX22531AAP+
- Part No.:
- MAX22531AAP+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
MAX22531AAP+.pdf
- Description:
- SELF POWERED 4 CHANNEL 12-BIT IS
- Quantity:
- Payment:
- Shipping:
Inventory:219
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Product details
Overview
MAX22531AAP+ from Analog Devices is a galvanically isolated, 4-channel, multiplexed, 12-bit analog-to-digital converter with integrated isolated DC-DC power supply, designed for high-voltage binary input monitoring in industrial field-side applications. It delivers 20ksps per-channel sampling, programmable high/low thresholds per input, and SPI interface with CRC option - enabling real-time voltage digitization and fast comparator response (<75µs latency without filtering) in substation and process automation systems.
For engineers reviewing the MAX22531AAP+ datasheet, MAX22531AAP+ pinout, MAX22531AAP+ application, or MAX22531AAP+ equivalent, this device supports field-side self-powered diagnostics, continuous power monitoring, and robust isolation (3.75kVRMS, 5.5mm creepage/clearance), making it critical for safety-critical I/O conditioning where signal integrity, fault reporting, and system uptime are prioritized.
Technical Context
The MAX22531AAP+ implements a galvanically isolated architecture with dual-domain operation: field-side ADC and comparators powered by an integrated isolated DC-DC converter (VDDF = 2.7–5.5V), and logic-side SPI interface powered separately (VDDL = 1.71–5.5V). Its 12-bit SAR ADC core digitizes four analog inputs (AIN1–AIN4) within 0–1.8V range using a precision internal 1.8V reference (±1% typical accuracy).
Each channel features independent programmable comparators with digital input mode (COUT_ asserts high/low based on threshold crossing) and digital status mode (COUT_ reflects latched comparator state). Filtering applies a moving average of the last 4 ADC readings, configurable per channel, while CMTI rating exceeds 50kV/µs ensures noise immunity in high dv/dt environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ADC Resolution | 12-bit SAR architecture enabling 0.024% full-scale resolution for precise voltage monitoring. |
| Sample Rate | 20ksps per channel (typ), supporting real-time detection of transient events in industrial control loops. |
| Isolation Rating | 3.75kVRMS withstand (60s), meeting IEC 60747-5-5 for reinforced insulation in safety-critical systems. |
| Creepage/Clearance | 5.5mm minimum - satisfies IEC 61000-4-5 surge and pollution degree 2 requirements in compact SSOP layout. |
| Reference Accuracy | ±1% typical (±2% over -40°C to +125°C), eliminating need for external reference calibration in wide-temp deployments. |
| CMTI | >50kV/µs - maintains data integrity during rapid common-mode transients typical in motor drives and HV substations. |
| Comparator Latency | <75µs (no filter), enabling sub-100µs fault response for emergency shutdown signaling. |
Pinout & Package
MAX22531AAP+ is housed in a 20-pin SSOP package (package code A20MS+7, outline 21-0056) with 5.5mm creepage/clearance and Group II CTI-rated material (>400). Pin functions are validated per Analog Devices' official pin configuration diagram and description table.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 14 | VDDF | Field-side isolated DC-DC output; powers ADC front-end and comparators - must be bypassed with 1µF||0.01µF to GNDF, no external load permitted. |
| 2, 3, 4, 5 | AIN1–AIN4 | Analog inputs referenced to AGND; accept 0–1.8V signals with ±600nA leakage - compatible with 60kΩ series input resistors for HV sensing. |
| 6, 7 | COUT1, COUT2 | Dedicated comparator outputs for channels 1 and 2; open-drain capable, driven high/low based on programmable THU/TLL thresholds. |
| 8 | GNDL | Logic-side ground reference for VDDL, VDDPL, SPI, and INT - electrically isolated from GNDF by >10¹²Ω insulation resistance. |
| 9, 10 | VDDL, VDDPL | VDDL powers logic/SPI (1.71–5.5V); VDDPL supplies isolated DC-DC converter (3.0–5.5V) - both require local 1µF||0.01µF decoupling. |
| 11, 12 | CS, SCLK | SPI chip select and clock inputs; support up to 10MHz operation with 20ns setup/hold timing - enable burst reads and CRC-protected commands. |
| 13, 15, 16, 17, 18, 19 | SDI, SDO, INT, REF, AGND, GNDF | SDI/SDO handle bidirectional SPI data; INT signals threshold violations; REF connects 1µF capacitor to stabilize 1.8V reference; AGND/GNDF are separate analog/field grounds. |
Key Features
| Feature | Design Value |
|---|---|
| Field-side self-powered operation | Integrated isolated DC-DC eliminates need for external field-side supply - enables diagnostics even with zero input signal. |
| Programmable per-channel comparators | Independent upper/lower thresholds (12-bit resolution) with hysteresis control - reduces false triggers in noisy industrial environments. |
| SPI with CRC option | Configurable CRC byte per transaction ensures data integrity across isolation barrier - critical for SIL-2/IEC 61508-compliant systems. |
| Continuous field-side diagnostics | Real-time monitoring of ADC functionality, power rail health, and communication stream continuity - improves predictive maintenance capability. |
| High ESD/surge immunity | ±8kV contact / ±15kV air-gap ESD on AIN pins; ±7.2kV surge (IEC 61000-4-5) - sustains operation in unshielded field wiring scenarios. |
Applications
| Substation Automation | Distribution Automation |
|---|---|
Use Scenario: Monitoring high-voltage breaker status and busbar voltage in 11kV–35kV switchgear cabinets. IC Role / Device Role / Timing Role: Isolated ADC digitizes conditioned analog signals from resistive dividers and drives fast-response COUT pins for trip logic. Use Value: 3.75kVRMS isolation and 5.5mm creepage meet IEC 62271-1 clearance requirements while enabling direct integration into protection relays. |
Use Scenario: Remote terminal unit (RTU) acquisition of feeder current/voltage via CT/PT secondary outputs in overhead line networks. IC Role / Device Role / Timing Role: Field-side self-powered ADC samples four analog inputs simultaneously and reports anomalies via SPI-interrupt to ARM Cortex-M host. Use Value: Integrated 1.8V reference and ±1% accuracy eliminate calibration drift across -40°C to +125°C ambient - reducing field recalibration cycles. |
| Process Automation | Motion Control |
Use Scenario: Analog input conditioning for PLC I/O modules in chemical plant control systems with hazardous area zoning. IC Role / Device Role / Timing Role: Galvanic isolation separates hazardous field-side sensors (4–20mA loop receivers) from safe-zone logic, with COUT_ providing immediate alarm assertion. Use Value: 50kV/µs CMTI rating prevents misreads during variable-frequency drive switching noise - ensuring deterministic I/O behavior. |
Use Scenario: Position feedback and motor phase current sensing in servo drives with integrated safety torque off (STO) monitoring. IC Role / Device Role / Timing Role: Four-channel ADC monitors encoder supply, current shunt voltages, and temperature sensors - all referenced to isolated GNDF. Use Value: Field-side continuous power monitoring detects early DC-DC degradation before catastrophic failure - extending mean time between failures (MTBF). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolated multichannel ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7403BRIZ-RL7 | 2-channel, 16-bit Σ-Δ isolated ADC; no integrated DC-DC; requires external isolated supply; 20MHz SPI; no comparator outputs. | Higher resolution but lacks per-channel thresholding and field-side autonomy - suited for precision metrology, not binary input monitoring. | Select when absolute accuracy >12-bit and external isolated supply is available; avoid when field-side diagnostics or fast interrupt response are required. |
| ISO224BDWPR | Single-channel, 2nd-gen reinforced isolated amplifier (not ADC); 12-bit effective resolution via external MCU sampling; no built-in ADC or comparators. | Requires external microcontroller for digitization and logic - increases BOM count and firmware complexity versus integrated solution. | Choose for high-bandwidth analog signal isolation (10MHz BW) where discrete sampling and processing are acceptable trade-offs. |
Compared with AD7403BRIZ-RL7 and ISO224BDWPR, MAX22531AAP+ uniquely integrates field-side power, 4-channel 12-bit ADC, programmable comparators, and SPI-CRC in one SSOP package - reducing component count, PCB area, and firmware overhead for industrial binary/analog input modules.
Availability
MAX22531AAP+ is available at Aetrix Electronics and suitable for substation automation, distribution automation, and process automation requiring stable component supply, long-term lifecycle support, and compliance with IEC 61000-4-5 surge and IEC 62271-1 clearance standards.
Supply support for MAX22531AAP+ 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
Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.
The MAX22531AAP+ belongs to the MAXSafe™ family of galvanically isolated data acquisition ICs, engineered specifically for high-reliability field-side sensing in harsh electrical environments where safety certification, diagnostic coverage, and long-term stability are mandatory.
FAQ
What is the isolation rating and certification status of the MAX22531AAP+?
The MAX22531AAP+ provides 3.75kVRMS isolation for 60 seconds per UL 1577 and CSA Bulletin 5A, with 5.5mm creepage and clearance. It meets IEC 60747-5-5 for reinforced insulation and carries VISO = 3750VRMS, VIOWM = 445VRMS, and CMTI >50kV/µs - validated for use in SIL-2 subsystems per IEC 61508 when implemented per datasheet guidelines. MAX22531AAP+ is certified for operation from -40°C to +125°C ambient.
Does the MAX22531AAP+ require an external power supply on the field side?
No - the MAX22531AAP+ features an integrated isolated DC-DC converter that generates VDDF (2.7–5.5V) on the field side from the logic-side VDDPL supply. This enables field-side ADC operation, comparator functionality, and diagnostics even when no analog input signal is present. External loading of VDDF is prohibited; only 1µF||0.01µF bypass capacitors to GNDF are allowed. MAX22531AAP+ thus eliminates the need for separate field-side power rails.
How many comparator outputs does the MAX22531AAP+ provide, and what are their functions?
The MAX22531AAP+ provides two dedicated comparator output pins: COUT1 and COUT2, corresponding to AIN1 and AIN2. Each output asserts high when its input voltage exceeds the programmed upper threshold (THU), and low when below the lower threshold (TLL), in digital input mode. Response time is <75µs without filtering. COUT1 and COUT2 support direct connection to FPGA or MCU interrupt inputs for hard real-time fault detection - a key capability distinguishing MAX22531AAP+ from single-output isolated ADCs.
Can the MAX22531AAP+ operate with a 1.8V logic supply?
Yes - the MAX22531AAP+ supports VDDL from 1.71V to 5.5V, fully compatible with 1.8V logic interfaces. SPI timing parameters (e.g., tDINSU = 20ns, fSCLK = 10MHz max) remain valid across this range. The internal 1.8V reference (VREF) is independent of VDDL and maintains ±1% typical accuracy. When using 1.8V VDDL, ensure VIH/VIL thresholds (0.7×VDDL / 0.3×VDDL) align with driving device levels - MAX22531AAP+ tolerates 50mV input hysteresis for noise margin. MAX22531AAP+ thus interoperates seamlessly with low-voltage microcontrollers.
What diagnostic capabilities does the MAX22531AAP+ offer for field-side operation?
The MAX22531AAP+ provides three autonomous field-side diagnostics: ADC functionality error detection (e.g., stuck-at faults), isolated DC-DC power-up verification (tPWRUP = 10ms), and continuous communication stream monitoring (loss-of-data-stream flag). These are reported via SPI-accessible status registers and can trigger the INT pin. Unlike externally powered isolators, MAX22531AAP+ enables these checks without any field-side external supply - confirming sensor connectivity, power health, and data path integrity before system startup. This capability is intrinsic to MAX22531AAP+'s self-powered architecture.
MAX22531AAP+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 22k
- Number of Inputs:
- 4
- Input Type:
- Single Ended
- Data Interface:
- SPI
- Configuration:
- ADC
- Ratio - S/H:ADC:
- 0:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- Internal
- Voltage - Supply, Analog:
- 1.71V ~ 5.5V
- Voltage - Supply, Digital:
- 1.71V ~ 5.5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Supplier Device Package:
- 20-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX22531AAP+ FAQ
1.How can I place an order for MAX22531AAP+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX22531AAP+ 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 MAX22531AAP+ reliable?
The price and inventory of MAX22531AAP+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX22531AAP+ is usually 5 days.
3.What payment methods are accepted for MAX22531AAP+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX22531AAP+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX22531AAP+?
MAX22531AAP+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX22531AAP+ 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 MAX22531AAP+?
For technical support, including MAX22531AAP+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX22531AAP+ requirements.
6.How does Aetrix verify that MAX22531AAP+ is sourced from the original manufacturer or authorized distributors?
All MAX22531AAP+ 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 MAX22531AAP+ meets industry standards.
7.What is the process for return or replacement of MAX22531AAP+?
All MAX22531AAP+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX22531AAP+, 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 MAX22531AAP+ part is unused and in its original packaging.
Return procedure for MAX22531AAP+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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