I have a current feedback loop which controls a FET driver which outputs 0-2A based on a 3.3V DAC with 255 step resolution = 13mV per step.
Initially I used a LMV324 but have measured a GND output of 124mV, which makes current control at the low end problematic at a minimum output of around 60mA. According to LTSpice the standard LM324 has an output of around 40mV, which would require a minimum DAC resolution of 4/255 and simulates to an output of about 20mA.
I just wanted to check if there's a reasonably priced alternative to the LM324 which can meet or exceed this ground output voltage?
Vcc is 4.5v-5.25v, +input won't exceed 50mV. Feedback loop has to be kept under 1MHz for the Fet driver at around 0.5MHz.
Initially I used a LMV324 but have measured a GND output of 124mV, which makes current control at the low end problematic at a minimum output of around 60mA. According to LTSpice the standard LM324 has an output of around 40mV, which would require a minimum DAC resolution of 4/255 and simulates to an output of about 20mA.
I just wanted to check if there's a reasonably priced alternative to the LM324 which can meet or exceed this ground output voltage?
Vcc is 4.5v-5.25v, +input won't exceed 50mV. Feedback loop has to be kept under 1MHz for the Fet driver at around 0.5MHz.