My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX22531AAP+T
- Part No.:
- MAX22531AAP+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
MAX22531AAP+T.pdf
- Description:
- SELF POWERED 4 CHANNEL 12-BIT IS
- Quantity:
- Payment:
- Shipping:
Inventory:1,893
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX22531AAP+T 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 automation systems. It delivers 20ksps per-channel sampling, programmable high/low thresholds per input, and SPI interface with CRC support - enabling real-time field-side diagnostics without external power on the isolated side.
For engineers reviewing the MAX22531AAP+T datasheet, MAX22531AAP+T pinout, MAX22531AAP+T application, or MAX22531AAP+T equivalent, this device serves as a self-powered, high-integrity solution for substation and distribution automation where creepage, CMTI immunity (>50kV/µs), and 3.75kVRMS isolation compliance are critical selection criteria.
Technical Context
The MAX22531AAP+T implements a fully isolated signal chain: its field-side ADC core digitizes four analog inputs (0–1.8V range) using an internal 1.8V ±1% reference, while the logic-side processes data via SPI and asserts interrupts when any channel crosses user-defined thresholds. The integrated isolated DC-DC converter powers all field-side circuitry, enabling continuous operation and diagnostics even with no input signal present.
Each channel features a dedicated comparator with digital input mode (COUT_ output active within <75µs latency, unfiltered) and digital status mode, configurable via SPI registers. Isolation barrier integrity is certified to UL1577 and CSA Bulletin 5A, with 5.5mm creepage/clearance and CTI ≥400 (Group II).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ADC Resolution | 12-bit - provides 4096 discrete levels for precise analog voltage quantization across all 4 channels. |
| Sample Rate | 20ksps per channel (typ) - supports real-time monitoring of fast-changing industrial signals such as breaker status transitions. |
| Isolation Rating | 3.75kVRMS for 60s - meets IEC 60747-5-5 requirements for reinforced insulation in medium-voltage sensing applications. |
| CMTI | 50kV/µs minimum - ensures reliable operation under high dv/dt noise common in motor drives and switchgear environments. |
| Input Voltage Range | 0V to 1.8V - compatible with standard industrial sensor outputs and scaled high-voltage divider networks. |
| Reference Accuracy | ±1% (typ) at +25°C - enables stable, repeatable ADC conversion without external calibration. |
| Operating Temp | −40°C to +125°C - supports deployment in outdoor substations and harsh industrial enclosures. |
Pinout & Package
MAX22531AAP+T is housed in a 20-pin SSOP package (package code A20MS+7) with 5.5mm creepage and clearance, RoHS-compliant, and rated for 3.75kVRMS isolation. Pin functions are validated per Analog Devices' official pin configuration diagram (Rev 3, p.13).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 14 | VDDF | Field-side isolated DC-DC output - powers ADC front-end and comparators; requires local 1µF||0.01µF bypassing to GNDF. |
| 2, 27 | N.C. | No connection - must remain unconnected per datasheet; not internally bonded. |
| 3, 4, 5, 6 | AIN1–AIN4 | Analog inputs - accept 0–1.8V signals referenced to AGND; each has independent programmable threshold comparator. |
| 7, 10 | COUT1, COUT2 | Dedicated comparator outputs - provide immediate digital status per channel (high = above upper threshold, low = below lower threshold). |
| 8, 9, 11, 12, 13, 15, 16, 17, 18, 19, 20 | GNDL, GNDF, VDDL, VDDPL, REF, CS, SCLK, SDI, SDO, INT, AGND | Logic ground, field ground, logic supply, isolated DC-DC input, reference filter, SPI control and data, interrupt, and analog ground - define dual-domain power and communication boundaries. |
Key Features
| Feature | Design Value |
|---|---|
| Field-side self-powering | Integrated isolated DC-DC converter eliminates need for external field-side power supply - reduces BOM count and system complexity. |
| Programmable per-channel comparators | Independent high/low thresholds with hysteresis enable flexible binary input detection and fault-level triggering without host MCU intervention. |
| SPI with CRC option | Configurable cyclic redundancy check on SPI transfers prevents undetected data corruption in noisy industrial bus environments. |
| Field-side diagnostics | Continuous ADC functionality verification and power monitoring available even during zero-input conditions - improves system uptime and predictive maintenance capability. |
| Robust ESD/transient immunity | ±7.2kV surge (IEC 61000-4-5) and ±15kV air-gap ESD (IEC 61000-4-2) on analog inputs - sustains operation in electrically hostile substation settings. |
Applications
| High-Voltage Binary Input | Substation Automation |
|---|---|
Use Scenario: Monitoring open/closed status of high-voltage circuit breakers using resistive voltage dividers. IC Role / Device Role / Timing Role: Isolated ADC captures scaled analog representation of breaker voltage; comparators generate immediate COUT_ assertion upon state change. Use Value: Enables direct integration into protection relays with no external field-side power, meeting IEC 61850-3 EMC and safety requirements. |
Use Scenario: Digitizing auxiliary voltage and current signals from instrument transformers in digital substations. IC Role / Device Role / Timing Role: Provides galvanically isolated, time-synchronized 4-channel acquisition for IEDs; SPI CRC ensures data integrity over long backplane traces. Use Value: Reduces need for separate isolation amplifiers and power supplies - simplifying IED board layout and improving MTBF. |
| Distribution Automation | Motion Control |
Use Scenario: Detecting fault indicators and capacitor bank switching status in medium-voltage feeder cabinets. IC Role / Device Role / Timing Role: Field-side self-powered operation allows mounting directly on pole-mounted equipment; COUT_ outputs feed PLC DI modules. Use Value: Eliminates field wiring for auxiliary power - accelerating deployment and reducing failure points in remote locations. |
Use Scenario: Monitoring encoder supply voltage, brake status, and thermal sensor outputs in servo drive feedback loops. IC Role / Device Role / Timing Role: Simultaneous 4-channel sampling with <75µs comparator latency ensures rapid response to overtemperature or loss-of-feedback events. Use Value: Supports SIL-2 functional safety architecture by providing independent, isolated status monitoring without shared power domains. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolated multichannel ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADuM7440ARQZ | Quad-channel digital isolator only - no ADC, no integrated DC-DC, no comparator logic. | Requires external ADC, reference, and isolated power supply - increases design complexity and board area. | Choose only if existing system already includes field-side ADC and power; MAX22531AAP+T integrates all three functions. |
| ISO224BDWVR | Single-channel isolated amplifier (2V/V gain) - no multiplexing, no digital comparator outputs, no SPI interface. | Needs external µC for digitization and threshold evaluation; unsuitable for multichannel binary input consolidation. | Select when precision analog signal conditioning is required instead of digital event detection; MAX22531AAP+T targets discrete-state monitoring. |
Compared with ADuM7440ARQZ and ISO224BDWVR, the MAX22531AAP+T uniquely combines 4-channel isolation, self-powered operation, on-chip ADC, and programmable digital comparators - delivering a complete, space-efficient solution for high-voltage binary input systems without requiring additional signal-chain components.
Availability
MAX22531AAP+T is available at Aetrix Electronics and suitable for substation automation, distribution automation, and motion control applications requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for MAX22531AAP+T 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets with precision data conversion and isolation solutions.
The MAX22531AAP+T belongs to the MAXSafe™ family of galvanically isolated ADCs, engineered specifically for high-reliability industrial sensing where field-side autonomy, diagnostic capability, and regulatory compliance are mandatory.
FAQ
What is the isolation rating and certification status of the MAX22531AAP+T?
The MAX22531AAP+T is rated for 3.75kVRMS withstand voltage for 60 seconds and certified to UL1577 and CSA Bulletin 5A standards. Its 20-pin SSOP package provides 5.5mm creepage and clearance with CTI ≥400 (Group II), satisfying reinforced insulation requirements for industrial and utility applications. These ratings are verified per IEC 60747-5-5 and documented in the official Analog Devices datasheet Rev 3.
Does the MAX22531AAP+T require an external power supply on the field side?
No - the MAX22531AAP+T includes an integrated isolated DC-DC converter that powers all field-side circuitry (ADC, comparators, reference) from the logic-side VDDPL supply. This field-side self-powering enables operation and diagnostics even when no analog input signal is present, eliminating the need for external field-side power rails or isolated bias supplies.
How many comparator outputs does the MAX22531AAP+T provide, and what is their response time?
The MAX22531AAP+T provides two dedicated comparator output pins: COUT1 and COUT2. In digital input mode with filtering disabled, typical response time from input step to COUT_ transition is less than 75µs. With filtering enabled (averaging last 4 ADC readings), latency increases to ~300µs - allowing trade-off between noise immunity and speed based on application needs.
Can the MAX22531AAP+T operate across the full industrial temperature range?
Yes - the MAX22531AAP+T is specified to operate continuously from −40°C to +125°C ambient temperature. This extended range is validated across all electrical parameters including ADC accuracy, reference stability, and isolation barrier performance, making it suitable for deployment in outdoor substations, motor control cabinets, and other thermally demanding environments.
What SPI interface features does the MAX22531AAP+T support?
The MAX22531AAP+T supports a 10MHz SPI interface with optional CRC error checking on both read and write transactions. It supports standard single-register access, burst reads, and configurable command formats. All SPI timing parameters - including setup/hold times, clock period, and inter-access gap - are fully characterized from −40°C to +125°C and meet industrial noise immunity requirements.
MAX22531AAP+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- 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+T FAQ
1.How can I place an order for MAX22531AAP+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX22531AAP+T 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+T reliable?
The price and inventory of MAX22531AAP+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX22531AAP+T is usually 5 days.
3.What payment methods are accepted for MAX22531AAP+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX22531AAP+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX22531AAP+T?
MAX22531AAP+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX22531AAP+T 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+T?
For technical support, including MAX22531AAP+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX22531AAP+T requirements.
6.How does Aetrix verify that MAX22531AAP+T is sourced from the original manufacturer or authorized distributors?
All MAX22531AAP+T 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+T meets industry standards.
7.What is the process for return or replacement of MAX22531AAP+T?
All MAX22531AAP+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX22531AAP+T, 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+T part is unused and in its original packaging.
Return procedure for MAX22531AAP+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX22531AAP+T Tags
-
ADC081C021CIMKX/NOPB
Texas Instruments
-
MCP3021A5T-E/OT
Microchip Technology
-
TLA2024IRUGR
Texas Instruments
-
MCP3221A5T-E/OT
Microchip Technology
-
MCP3221A5T-I/OT
Microchip Technology
-
MCP3221A4T-E/OT
Microchip Technology
-
MCP3221A6T-E/OT
Microchip Technology
-
MCP3221A0T-E/OT
Microchip Technology
-
MCP3221A1T-E/OT
Microchip Technology
-
ADC121S021CIMFX/NOPB
Texas Instruments
-
MCP3001-I/MS
Microchip Technology
-
MCP3001-I/SN
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
