HV256
32-Channel High Voltage
Amplifier Array
Features
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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
General Description
The Supertex HV256 is a 32-channel high voltage amplifier
array integrated circuit. It operates on a single high voltage
supply, up to 300V, and two low voltage supplies, V
DD
and
V
NN
.
The input voltage range is from 0V to 4.096V. The internal
closed loop gain is 72V/V, giving an output voltage of 295V
when 4.096V is applied. Input voltages of up to 5V can be
applied, but will cause the output to saturate. The maximum
output voltage swing is 5V below the V
PP
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 R
SOURCE
resistor
controls the maximum sourcing current and an external R
SINK
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.
Applications
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MEMS (microelectromechanical systems) driver
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Piezoelectric transducer driver
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Optical crosspoint switches
(using MEMS technology)
Typical Application Circuit
Micro
Processor
DAC
DAC
DAC
DAC
Supertex
HV256
V
IN
0
V
IN
1
V
IN
2
V
IN
3
V
DD
V
PP
HV
OUT
0
HV
OUT
1
HV
OUT
2
x
y
y
x
High Voltage
Op-Amp
Array
HV
OUT
3
MEMS
Array
HV
OUT
30
HV
OUT
31
DAC
DAC
V
IN
30
V
IN
31
R
SOURCE
R
SINK
A
GND
V
NN
SUPERTEX [ Supertex, Inc ]
