Tool/software:
HI:
I need a unit gain buffer (G=1), and input voltage -15v ,voltage rising time (from 0~90%) as 20us, so I choose OPA564
I tried following two cases:
case 1.
vin = -15V , V+ = 0V ,V- = -24V => This case failed
case 2.
vin = -15V , V+ = 8V ,V- = -15V => This case work
Hi Yuhua,
case 1.
vin = -15V , V+ = 0V ,V- = -24V => This case failed
The OPA564/OPA564-Q1 is able to meet the rising edge requirements from a step voltage of 15V delta (the slew rate is 40 V/usec).
The output voltage range may violate the linear operation requirements, since the output is -15Vdc as well, but V+ = GND. What is the load or type of load? Perhaps OPA593 may work better for the application.
case 2.
vin = -15V , V+ = 8V ,V- = -15V => This case work
Yes, the dual supply voltage configuration meet both Vcm and output voltage swing ranges per the linear requirements.
If you tell me the type of application or design requirements, I may be able to suggest something more suitable for your need. Please let me know.
Best,
Raymond
