dick_freebird
Advanced Member level 7
Looking at testing a complex chip with 11 different supplies,
for latchup. I want to monitor them all. I have found some
chips that have built in limit comparators (which would be
handy for simplicity of monitoring and quenching the latchup
events), a wide range of bandwidths and gains, likewise the
common mode range (some nice ones, specwise, have an
unfortunate requirement that one end of the sense resistor
must be the same supply as runs the chip). I have a couple
of low voltage negative supplies to deal with, 9 low voltage
positive supplies (1.8 to 3.3V, which takes the options -way-
down in this niche of high voltage focused power supply
parts).
I've got my eye on INA302, LMP8645, LT1999, AD8216,
MAX9643 now (having looked at a dozen others) but none
is entirely satisfactory.
If you were going to try and monitor supplies from -1V to
+4V common mode, wanted a gain of 10 or better (V/V)
(though I am liking a current mode output with gain, and
a select gain resistor off chip too), and >500kHz BW, what
other would you suggest? I expect to have +12V, +5V
available but see no need for higher VCM and Vsupply,
which is what a lot of the parts aim to support.
for latchup. I want to monitor them all. I have found some
chips that have built in limit comparators (which would be
handy for simplicity of monitoring and quenching the latchup
events), a wide range of bandwidths and gains, likewise the
common mode range (some nice ones, specwise, have an
unfortunate requirement that one end of the sense resistor
must be the same supply as runs the chip). I have a couple
of low voltage negative supplies to deal with, 9 low voltage
positive supplies (1.8 to 3.3V, which takes the options -way-
down in this niche of high voltage focused power supply
parts).
I've got my eye on INA302, LMP8645, LT1999, AD8216,
MAX9643 now (having looked at a dozen others) but none
is entirely satisfactory.
If you were going to try and monitor supplies from -1V to
+4V common mode, wanted a gain of 10 or better (V/V)
(though I am liking a current mode output with gain, and
a select gain resistor off chip too), and >500kHz BW, what
other would you suggest? I expect to have +12V, +5V
available but see no need for higher VCM and Vsupply,
which is what a lot of the parts aim to support.