LT1819
Production
The LT1818/LT1819 are single/dual wide bandwidth, high slew rate, low noise and distortion operational amplifiers with excellent DC performance. The LT1818...
Datasheet
LT1819 on Analog.com
I have a task to get simple lever shifter from 3.3V to 10V, exactly, for feeding the MOSFET driver from ESP32 microcontroller. It is double op-amp LT1819 used as comparator between fixed 2.7V and incoming signal from MC and logic inverter based on next op-amp. The SPICE netlist is as follows:
V1 N001 0 10 Rser=0.1
V2 N006 0 3.3 Rser=1
V3 N002 0 PULSE(0 3.3 0 5ns 5ns 1ms 2ms 10) Rser=1000
R1 N004 0 5000 tol=1 pwr=0.1
XU1 N005 N002 N003 N001 0 LT1818
XU3 N005 N003 N004 N001 0 LT1818
R2 N005 N006 1k
R3 N005 0 9.1k
.tran 5
.lib LTC2.LIB
.backanno
.end
1000 Ohm parasitic serial resistance in V3 (the virtual port of MC) eliminates the usual serial resistor placing. The simulation gives perfect result. But op-amps, bought from an reliable supplier (digikey.com) warm up quickly and does not act as expected.
Hi Vahe: The LT1819 should not be used as a comparator. Here is text from the data sheet; "Sustained differential inputs, however, will result in excessive power dissipation and therefore this device should not be used as a comparator."
Depending on gate capacitance and speed required, I would suggest using a comparator for this task. An LT1713 would do well, as it can be supplied with 10V. Or if speed is not required, an LT1716 might do it (very weak pullup).
Dear Glen, thank you, thank you and once again, thank you.
You have solved a head destroying puzzle for me.
Dear Glen, thank you, thank you and once again, thank you.
You have solved a head destroying puzzle for me.