floppy32
Member level 1
I will make a DAC output amplifier PCB using this quad-opamp(OP484FPZ) and the schematics is below so far:
Brief description about the application:
out1 and out2 will couple to a driver which controls a galvo-mirror. DAC input is coming from a 16-bit DAC(controlled by a STM2 microcontroller board through SPI) it can maximum provide 2.5V to the DAC input of the above circuit. Vp(2.5V) is coming from a precision reference which is the same reference for the DAC as well. The supply voltages of the galvo driver and the above circuit(Vcc and Vee) will be +/-15V from a dual SMPS.
The entire electronics will be inside one of the rack shelf and the other shelf there will be server, computer, other power supplies ect. And the entire application will be indoors.
I don't have experience about opamp protection and I only know some uses zeners or clamp diodes, TVSs with different configurations. When I started to read I was confused what to use at which node in my case and also some even warns diodes can have effect on precision because of their leakage currents.
I just can say the datasheet of the opamp I use doesn't say much about ESD protection and it mentiones:
For input voltages greater than 0.6 V, the input current should be limited to
less than 5 mA to prevent degradation or destruction of the input devices.
I don't want to be super paranoid about it but I wonder if this circuit would require an extra protection. I use all the opmaps of this quad-opamp as you see and I cannot imagine I need to install diodes at all opamp inputs. On the other hand, I cannot make a judgement with my little knowledge if there's such necessity at least for the minimum protection.
Brief description about the application:
out1 and out2 will couple to a driver which controls a galvo-mirror. DAC input is coming from a 16-bit DAC(controlled by a STM2 microcontroller board through SPI) it can maximum provide 2.5V to the DAC input of the above circuit. Vp(2.5V) is coming from a precision reference which is the same reference for the DAC as well. The supply voltages of the galvo driver and the above circuit(Vcc and Vee) will be +/-15V from a dual SMPS.
The entire electronics will be inside one of the rack shelf and the other shelf there will be server, computer, other power supplies ect. And the entire application will be indoors.
I don't have experience about opamp protection and I only know some uses zeners or clamp diodes, TVSs with different configurations. When I started to read I was confused what to use at which node in my case and also some even warns diodes can have effect on precision because of their leakage currents.
I just can say the datasheet of the opamp I use doesn't say much about ESD protection and it mentiones:
For input voltages greater than 0.6 V, the input current should be limited to
less than 5 mA to prevent degradation or destruction of the input devices.
I don't want to be super paranoid about it but I wonder if this circuit would require an extra protection. I use all the opmaps of this quad-opamp as you see and I cannot imagine I need to install diodes at all opamp inputs. On the other hand, I cannot make a judgement with my little knowledge if there's such necessity at least for the minimum protection.