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HV257 Datasheet(PDF) 1 Page - Supertex, Inc

Part # HV257
Description  32 CHANNEL HIGH VOLTAGE SAMPLE AND HOLD AMPLIFIER ARRAY
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Manufacturer  SUTEX [Supertex, Inc]
Direct Link  http://www.supertex.com
Logo SUTEX - Supertex, Inc

HV257 Datasheet(HTML) 1 Page - Supertex, Inc

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1
HV257
A122104
32-Channel High Voltage
Sample and Hold Amplifier Array
Features
32 independent high voltage amplifiers
❑ 300V operating voltage
❑ 295V output voltage
❑ 2.2V/µs typical output slew rate
❑ Adjustable output current source limit
❑ Adjustable output current sink limit
❑ Internal closed loop gain of 72V/V
❑ 12MΩ feedback impedance
❑ Layout ideal for die applications
Application
❑ MEMS (microelectromechanical systems) driver
❑ Piezoelectric transducer driver
❑ Optical crosspoint switches (using MEMS technology)
General Description
The Supertex HV257 is a 32-channel high voltage sample and
hold amplifier array integrated circuit. It operates on a single high
voltage supply, up to 300V, and two low voltage supplies, VDD
and VNN.
All 32 sample and hold circuits share a common analog input,
Vsig. The individual sample and hold circuits are selected by a
5 to 32 logic decoder. The sampled voltage on the holding
capacitor is buffered by a low voltage amplifier and amplified by
a high voltage amplifier with a closed loop gain of 72V/V. The
internal closed loop gain is set for an input voltage range of 0V
to 4.096V. The input voltage can be up to 5.0V, but the output will
saturate. The maximum output voltage swing is 5V below the VPP
high voltage supply. The outputs can drive capacitive loads of up
to 3000pF.
The maximum output source and sink current can be adjusted by
using two external resistors. An external RSOURCE resistor
controls the maximum sourcing current and an external RSINK
resistor controls the maximum sinking current. The current limit
is approximately 12.5V divided by the external resistor value.
The setting is common for all 32 outputs. A low voltage silicon
junction diode is made available to help monitor the die
temperature.
Demo Kit
Available
HV257
VSIG
A0
EN
A3
A2
A4
HVOUT0
Supertex HV257
High Voltage
Power Supply
Low Voltage
Power Supply
32
DGND
AGND
HVOUT1
MEMS
Array
y
y
x
x
HVOUT2
HVOUT3
HVOUT30
HVOUT31
A1
VNN
Low Voltage
Channel
Select
Sample
and Hold
High Voltage
OpAmp Array
Micro
Processor
DAC
A122104
Typical Application


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