Texas Instruments recommends a 4-layer PCB with a solid ground plane, and to keep the analog and digital signals separate. The analog input traces should be short and direct, and the digital output traces should be routed away from the analog inputs. Additionally, decoupling capacitors should be placed close to the device's power pins.
The ADS7835E/250G4 has a built-in POR and BOR circuitry that resets the device during power-up and power-down sequences. To handle this, ensure that the power supply ramps up and down slowly, and that the device's reset pin is properly connected to a pull-up resistor and capacitor to filter out noise.
The recommended clock frequency for the ADS7835E/250G4's serial interface is between 1 MHz and 4 MHz. The clock signal should have a 50% duty cycle, and the data should be valid on the rising edge of the clock. Additionally, ensure that the clock signal is clean and free of noise to prevent data corruption.
The ADS7835E/250G4 does not require calibration, as it has a built-in calibration circuitry that ensures optimal accuracy and linearity. However, it's recommended to perform a system-level calibration to account for any external component tolerances and PCB layout variations.
The maximum input voltage range for the ADS7835E/250G4 is 0V to 5V. To handle overvoltage protection, use external voltage limiting resistors or clamping diodes to prevent voltages above 5V from reaching the device's input pins.
ADS7835E/250G4 datasheet
by Texas Instruments
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