Analog Devices / Maxim Integrated MAX22005A 12-Channel Analog Input

Analog Devices MAX22005A 12-Channel Analog Input is an industrial-grade analog input voltage-mode device that can be configured as an analog input current-mode device using an external precision resistor per channel. The MAX22005A can operate as a configurable analog input using an external precision resistor and low-cost switch per channel. Input channels can be used as 12 single-ended inputs, six differential inputs, or up to eight multichannel configurable differential inputs. In total, the device supports up to 26 configurations. The MAX22005 features an integrated 24-bit delta-sigma ADC (Analog to Digital Converter) shared between all channels. The ADC can be used with an integrated 5ppm/°C precision reference or an external reference. Standard industrial analog input voltage ranges are converted to the ADC input voltage range using high-voltage, zero-drift input amplifiers. All input ports are robustly protected up to ±36V reverse polarity and ±2kV surge pulses without the need for TVS diodes.

Eight general-purpose digital I/O (GPIO) ports are available for common use, or they can control external switches for configurable inputs. The MAX22005 is factory calibrated with a system performance of less than 0.05% FSR Total-Unadjusted-Error (TUE) over temperature.

The host communicates with the MAX22005 through a high-speed 30MHz SPI bus for all configurations and information management and acquiring conversion results. An optional 8-bit Cyclic Redundancy Check (CRC) enhances the reliability of the SPI interface, protecting against all 8-bit bursts, as well as all double-bit errors.

The Analog Devices MAX22005 is available in a 48-pin LGA package and operates over the -40°C to +125°C industrial temperature range.

Features

Enables more robust and reliable systems
- ±36V high-voltage protection for all input ports
- 2kV HBM ESD protection of all pins
- ±2kV surge protection with external 5kΩ resistor
- CRC detection for robust serial communication
- Watchdog timer
Highly configurable
- Supports up to 26 different configurations
- ±12.5V analog input-voltage mode
- ±25mA analog input-current mode using an external sense resistor
- Configurable inputs using external sense resistor and low-cost switches

System accuracy
- 0.02% FSR at 25°C factory calibrated
- 0.05% FSR over ±50°C from 25°C factory calibration
- Maximum of 30nA input leakage
- 5ppm/°C internal reference
Additional Features
- Internal or external ADC reference
- Eight GPIO ports
- 48.5mW low power dissipation with ±5V supply
- 30MHz SPI/QSPI/DSP-compatible serial interface
-40°C to +125°C operating temperature
7.5mm x 7.0mm LGA-48 package