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| HV257DB2 Datasheet, PDF (1/2 Pages) Supertex, Inc – High Voltage Sample and Hold Array | |||
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HV257DB2
High Voltage Sample and Hold Array
General Description
The Supertex HV257DB2 is a 32-Channel, 295V, sample
and hold ampliï¬er array with a nominal gain of 72V/V. The
purpose of the HV257DB2 is to provide a means to easily
evaluate the Supertex HV257FG device. A high voltage
supply, VPP, and four low voltage supplies, AVDD and DVDD,
AVNN and DVNN, are required. Referring to the demo board
drawing shown below, the logic and VSIG connections are on
the left, the high voltage outputs are on the bottom, and the
supplies are on the right. Please follow the power up/down
sequence to avoid damaging the device.
Speciï¬cations
Parameter
VPP, High voltage supply:
AVDD / DVDD, Low voltage positive supply:
AVNN / DVNN, Low voltage negative supply:
VSIG, Input signal range:
HVOUT, Output voltage swing
AV, Closed loop gain
SR, Output slew rate into 100pF load
Value
300V
6.0V to 7.5V
-4.5V to -6.5V
0V to 5.0V
0V to 295V
72V/V ±5%
2.0V/µs
Board Layout
EN
A0
A1
A2
A3
A4
VSIG
VSGND
C9
HV257DB2
U1
HV257
C1
pin1
DGND
DVDD
DVNN
AGND
No Connect
AVDD
AVNN
AVPP
HVOUT31
HVOUT0
Power Up/Down Sequence
The device can be damaged due to improper power up/down
sequence. To prevent damage, please follow the acceptable
power up/down sequences. Two external diodes, D1 and
D2, are added in the demo board to prevent damage dur-
ing power Up/Down. The ï¬rst diode is a high voltage diode
across VPP and VDD. Any low current high voltage diode can
be used. The second diode can be any low voltage schottky
diode across VNN and GND.
Acceptable Power Up Sequences
1) VPP 2) VNN 3) VDD 4) Inputs & Anode
or
1) VNN 2) VDD 3) VPP 4) Inputs & Anode
Acceptable Power Down Sequences
1) Inputs & Anode
or
2) VDD 3) VNN
1) Inputs & Anode
2) VPP 3) VDD
4) VPP
4) VNN
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