HV257DB2
Inputs and Outputs
The output of the HV257FG will swing from 0V to 295V. The
internal closed loop gain is set at 72V/V. An input voltage of
4.096V will give an output of 295V. Input voltages of up to
5.0V can be applied but will cause the amplifier to saturate.
When EN is high, the addressed output, determined by A0
to A4, will be sampling the input signal V
SIG
. When EN is low,
all the internal sampling switches are open.
The output current source and sink for all 32 channels can
be adjusted using R1 and R2. The limit is approximately
12.5V divided by the resistor value. The demo board uses
24.9KΩ for ±500µA limiting.
Temperature Diode
The HV257FG has an integrated silicon diode to help moni-
tor the die temperature if desired. Pin 95 is the anode and
pin 96 is the cathode. Pads are available on the board for
these connections.
Circuit Diagram
V
PP
C1
10nF
C2
0.1µF
D1
C6
0.1µF
C8
0.1µF
C7
0.1µF
AV
DD
Byp-V
PP
Byp-AV
DD
Byp-AV
NN
V
PP
AV
DD
Anode
Cathode
AV
NN
C3
0.1µF
AGND
D2
R1
24.9KΩ
R2
24.9KΩ
AV
NN
R
SINK
R
SOURCE
DV
DD
DV
NN
HV257FG
HV
OUT
0
HV
OUT
1
HV
OUT
2
DV
DD
DV
NN
DGND
C4
0.1µF
C5
0.1µF
A0
A1
Logic
Control
Inputs
A2
A3
A4
EN
HV
OUT
30
HV
OUT
31
High
Voltage
Outputs
+
Analog
Input
V
SIG
C9
0.1µF
AGND
AGND
39
DGND
43, 89
-
C10
0.1µF
R3
0Ω
Bill of Materials
Description
C1
C2-C9
C10
R1
R2
R3
D1
D2
U1
X7R chip capacitor
X7R chip capacitor
X7R chip capacitor
Chip resistor
Chip resistor
Chip resistor
Rectifier diode
Schottky diode
Amplifier array
Value
500V, 0.01µF±10%
25V, 0.1µF±10%
10V, 1.0µF±10%
24.9KΩ, ±1%
24.9KΩ, ±1%
0Ω
400V, 1.0A
20V, 20mA
300V
Package
0805
0805
0805
0805
0805
0805
SMA
SOD-323
100-Lead MQFP
Manufacturer
Tecate
Tecate
Any
Any
Any
Any
Diodes Inc
Diodes Inc
Supertex
Part Number
CMC-500103KX0805T
CMC-025104KX0805T
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US1G
SD103CWS
HV257FG
NR041207
2
SUPERTEX [ Supertex, Inc ]
