HV257DB2 Supertex, HV257DB2 Datasheet
HV257DB2
Manufacturer Part Number
HV257DB2
Description
Manufacturer
Supertex
Datasheet
1.HV257DB2.pdf
(2 pages)
Specifications of HV257DB2
Lead Free Status / RoHS Status
Supplier Unconfirmed
General Description
The Supertex HV257DB2 is a 32-Channel, 295V, sample
and hold amplifier 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.
Board Layout
Power Up/Down Sequence
The device can be damaged due to improper power up/
down sequence. To prevent damage, please follow the ac-
ceptable power up/down sequences. Two external diodes,
D1 and D2, are added in the demo board to prevent dam-
age during power Up/Down. The first diode is a high voltage
diode across VPP and AVDD. Any low current high voltage
diode can be used. The second diode can be any low volt-
age schottky diode across AVNN and GND.
Acceptable Power Up Sequences
1) V
1) V
Supertex inc.
or
PP
NN
2) V
2) V
VSGND
NN
DD
VSIG
Supertex inc.
EN
A0
A1
A2
A3
A4
3) V
3) V
High Voltage Sample and Hold Amplifier Array
HV
DD
PP
OUT
31
4) Inputs & Anode
4) Inputs & Anode
C9
●
1235 Bordeaux Drive, Sunnyvale, CA 94089
pin1
HV257DB2
HV257
U1
Specifications
Parameter
V
AV
AV
V
HV
A
SR, Output slew rate into 100pF load
Acceptable Power Down Sequences
1) Inputs & Anode
1) Inputs & Anode
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 VSIG. When EN is low,
all the internal sampling switches are open.
V
PP
SIG
, Closed loop gain
DD
NN
, High voltage supply:
OUT
or
, Input signal range:
/ DV
/ DV
, Output voltage swing
DD
NN
, Low voltage positive supply:
, Low voltage negative supply:
●
Tel: 408-222-8888
C1
2) V
2) V
HV
OUT
DD
PP
●
www.supertex.com
0
3) V
3) V
NN
DD
HV257DB2
4) V
4) V
DGND
DVDD
DVNN
AGND
No Connect
AVDD
AVNN
VPP
PP
NN
-4.5 to -6.5V
72V/V ±5%
6.0 to 7.5V
0 to 295V
0 to 5.0V
2.0V/µs
Value
300V
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HV257DB2 Summary of contents
Page 1
... General Description The Supertex HV257DB2 is a 32-Channel, 295V, sample and hold amplifier 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 ...
Page 2
... SMA 20V, 20mA SOD-323 300V 100-Lead MQFP does not assume responsibility for use of devices described, and limits its liability Supertex inc. 2 HV257DB2 C7 0.1µF Byp-AVDD Byp-AVNN ANODE CATHODE HV 0 OUT HV 1 OUT HV ...