How to choose power supply components for generic current measurement contactless sensing signal chains? (Generic Signal Chains Current Measurement Contactless Sensing User Guide)

Answer

manuals.plus

Feb 24, 2025 - 12:34 AM

To select the appropriate power supply components for the generic signal chains for current measurement contactless sensing, you need to consider the input voltage requirements and power specifications of the signal chain components.

1. Input Voltage: The signal chain operates with an input voltage of either 5V, 12V, or 24V. Choose a power supply component that can provide the required input voltage.

2. Power Requirements: The power requirements for the different stages of the signal chain are as follows:

- Amplifier: The amplifier stage requires a supply voltage of 5V, a supply current of 0.95mA, and has a power supply rejection ratio (PSRR) of 72dB at 1MHz.
- Filter: The filter stage does not have specific power requirements mentioned in the manual.
- ADC: The ADC stage requires a supply voltage of 3.3V, a supply current of 5.42mA, and has a PSRR of 75dB at 200kHz.
- Reference: The reference stage requires a supply voltage of 1.8V, a supply current of 0.16mA, and has a PSRR of 60dB at 1MHz.

3. Power Supply Components: Based on the power requirements mentioned above, you can select the appropriate power supply components from the provided parts guide in the appendix of the user guide. Some examples of power supply components mentioned in the manual are:

- ADP7118: A 20V, 200mA, low noise, CMOS LDO linear regulator.
- ADP225: Dual, 300mA output, low noise, high PSRR voltage regulators with adjustable output voltage from 0.5V to 5V.
- LT3023: Dual 100mA, low dropout, low noise, micropower regulator.
- LT8338: A 40V, 1.2A micropower synchronous boost converter with pass-thru.
- LT8604: A high-efficiency 42V/120mA synchronous buck converter.

Consult the datasheets of these power supply components for further details on their specifications and suitability for your specific application.

Please note that the actual power supply component selection may vary depending on your specific requirements and the number of channels in the signal chain. It is recommended to refer to the datasheets and consult with Analog Devices or a qualified engineer for a more precise selection based on your application needs.