HV254
Diode
Symbol
Parameter
Min
Typ
Max
Units
Conditions
Power Up/Down Sequence
The device can be damaged due to improper power up / down
sequence. To prevent damage, please follow the acceptable
powerup/downsequencesandaddtwoexternaldiodesasshown
in the diagram below. The first diode is a high voltage diode
across Vpp and V+ where the anode of the diode is connected to
V+ and the cathode of the diode is connected to Vpp. Any low
current high voltage diode such as a 1N4004 will be adequate.
The second diode is a schottky diode across V- and DGnd where
theanodeoftheschottkydiodeisconnectedtoV-andthecathode
is connected to DGnd. Any low current schottky diode such as a
1N5817 will be adequate.
V+
VPP
1N4004
or similar
V-
PGND
1N5817
or similar
AcceptablePowerUpSequences
1) VPP
or
1) V-
2) V-
3) V+
3) VPP
4) Inputs & Anode
4) Inputs & Anode
2) V+
AcceptablePowerDownSequences
1) Inputs & Anode
or
1) Inputs & Anode
2) V+
3) V-
4) VPP
4) V-
2) VPP
3) V+
Pin Description
VPP
High voltage positive supply.
Analog low voltage positive supply
Analog low voltage negative supply
Device ground
V+
V-
PGND
Anode side of a low voltage silicon diode that can be used to monitor die
temperature.
Anode
Cathode side of a low voltage silicon diode that can be used to monitor die
temperature.
Cathode
VIN0 to VIN31
Amplifie.r inputs
Amplifier outpu.ts
HVOUT0 to HVOUT31
A113004
3
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