HV257
Truth Table
A4
L
L
L
L
•
•
•
H
H
H
X
H
H
H
X
H
H
H
X
A3
L
L
L
L
A2
L
L
L
L
A1
L
L
H
H
•
•
•
L
H
H
X
H
L
H
X
H
H
H
L
A0
L
H
L
H
EN
H
H
H
H
Selected S/H
0
1
2
3
•
•
•
29
30
31
All Open
Pin Description
V
PP
B
YP
-V
PP
AV
DD
B
YP
-AV
DD
AV
NN
B
YP
-AV
NN
DV
DD
DV
NN
DGND
AGND
A0 to A4
EN
Vsig
R
SOURCE
R
SINK
Anode
Cathode
HV
OUT
0 to HV
OUT
31
High voltage positive supply. There are two pads.
A low voltage 1.0 to 10nF decoupling capacitor across V
PP
and B
YP
-V
PP
is
required.
Analog low voltage positive supply. This should be at the same potential as
DV
DD
. There are two pads.
A low voltage 1.0 to 10nF decoupling capacitor across AV
DD
and B
YP
-AV
DD
is
required.
Analog low voltage negative supply. This should be the same potential as
DV
NN
. There are two pads.
A low voltage 1.0 to 10nF decoupling capacitor across AV
NN
and B
YP
-AV
NN
is
required.
Digital low voltage positive supply. This should be the same potential as AV
DD
.
There are two pads.
Digital low voltage negative supply. This should be the same potential as AV
NN
.
There are two pads.
Digital ground
Analog ground. There are three pads. They need to be externally connected
together.
Decoder logic inputs. Addressed channel will close the sample and hold switch.
Sample and hold switches for unaddressed channels are kept open.
Active logic high input. Logic low will keep sample and hold switches open.
Common input signal for all 32 sample and hold circuits.
External resistor from R
SOURCE
to V
NN
sets output current sourcing limit.
Current limit is approximately 12.5V divided by Rsource resistor value.
External resistor from R
SINK
to V
NN
sets output current sinking limit. Current
limit is approximately 12.5V divided by R
SINK
resistor value.
Anode side of a low voltage silicon diode that can be used to monitor die
temperature.
Cathode side of a low voltage silicon diode that can be used to monitor die
temperature.
Amplifier outpu.ts
A122104
5
SUPERTEX [ Supertex, Inc ]
