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| HV257_07 Datasheet, PDF (1/13 Pages) Supertex, Inc – 32-Channel High Voltage Sample and Hold Amplifi er Array | |||
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HV257
32-Channel High Voltage
Sample and Hold Ampliï¬er Array
Features
⺠32 independent high voltage ampliï¬ers
⺠300V operating voltage
⺠295V output voltage
⺠2.2V/µs typical output slew rate
⺠Adjustable output current source limit
⺠Adjustable output current sink limit
⺠Internal closed loop gain of 72V/V
⺠12M⦠feedback impedance
⺠Layout ideal for die applications
Applications
⺠MEMS (microelectromechanical systems) driver
⺠Piezoelectric transducer driver
⺠Optical crosspoint switches (using MEMS technology)
General Description
The Supertex HV257 is a 32 channel high voltage sample and
hold ampliï¬er 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 ampliï¬er and ampliï¬ed
by a high voltage ampliï¬er 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 approximated 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.
Typical Application Circuit
DAC
Micro
Processor
Supertex HV257
VSIG
Low Voltage
Power Supply
A0
A1
32
Low Voltage
A2
Channel
A3
Select
A4
Sample
and Hold
EN
High Voltage
Power Supply
HVOUT0
HVOUT1
HVOUT2
HVOUT3
High Voltage
OpAmp Array
HVOUT30
HVOUT31
y
x
x
y
MEMS
Array
DGND
AGND
VNN
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