Overview
The MAX22531AAP+ is a galvanically isolated, 4-channel, multiplexed, 12-bit analog-to-digital converter (ADC) from Analog Devices Inc./Maxim Integrated. It belongs to the MAXSafe™ family and is designed to provide robust detection and conversion of multichannel analog inputs. The device features an integrated, isolated DC-DC converter that powers all field-side circuitry, enabling field-side diagnostics even in the absence of an input signal. This ADC continually digitizes the input voltage on the field-side of the isolation barrier and transmits the data across the isolation barrier to the logic-side for comparison with programmable thresholds.
Key Specifications
| Parameter | Value |
|---|---|
| Number of Channels | 4 |
| Resolution | 12-bit |
| Sample Rate | 20 ksps (typ) per channel |
| Isolation Voltage | 3.75 kVRMS for 60s (VISO) |
| Creepage and Clearance | 5.5 mm |
| Package Type | 20-pin SSOP |
| Operating Temperature | -40°C to +125°C |
| Supply Voltage (Analog) | 1.71 V to 5.5 V |
| Supply Voltage (Digital) | 1.71 V to 5.5 V |
| Comparator Response Time | < 75 µs (without filtering) |
Key Features
- Galvanically isolated, 4-channel, multiplexed, 12-bit ADC
- Integrated, isolated DC-DC converter for field-side power
- Field-side diagnostics and continuous power monitoring
- Programmable threshold comparators for each channel
- Isolation for both data and DC-DC supply
- Integrated 1.8V reference
- High integration reduces BOM and board space
- Group II CTI package material with a minimum CTI of 400
Applications
- High-Voltage Binary Input
- Substation Automation
- Distribution Automation
- Process Automation
- Motion Control
Q & A
- What is the resolution of the MAX22531AAP+ ADC?
The MAX22531AAP+ has a resolution of 12 bits.
- How many channels does the MAX22531AAP+ support?
The device supports 4 channels.
- What is the sample rate of the MAX22531AAP+ ADC?
The sample rate is 20 ksps (typ) per channel.
- What is the isolation voltage rating of the MAX22531AAP+?
The device withstands 3.75 kVRMS isolation for 60s (VISO).
- What is the operating temperature range of the MAX22531AAP+?
The operating temperature range is -40°C to +125°C.
- What type of package does the MAX22531AAP+ come in?
The device is available in a 20-pin SSOP package.
- Does the MAX22531AAP+ have integrated DC-DC conversion?
Yes, it features an integrated, isolated DC-DC converter.
- Can the MAX22531AAP+ perform field-side diagnostics?
Yes, it supports field-side diagnostics and continuous power monitoring.
- What is the creepage and clearance of the MAX22531AAP+ package?
The package provides 5.5 mm of creepage and clearance.
- What are some typical applications of the MAX22531AAP+?
Typical applications include high-voltage binary input, substation automation, distribution automation, process automation, and motion control.
