Product
Summary
Sheet
HV256
32-Channel High Voltage Amplifier Array
Product Overview:
The HV256 is a 32-channel high voltage amplifier
array integrated circuit featuring programmable,
external current limit on each amplifier. Each
channel is configured as a noninverting amplifier.
The maximum output voltage swing is 5V below
the V
PP
high voltage supply. The outputs can
drive capacitive loads of up to 3000pF. Typical
slew rate under a no load condition is 2.0V/碌s.
The amplifier has an internal closed loop gain of
37dB or 72V/V saving the user from having to
use external gain setting resistors. When a DAC
voltage of 4.096 is applied to the input of an
amplifier an output voltage of 295V will be cre-
ated.
The HV256 operates on a 300V supply and two
low voltage supplies, 8.0V and -7.0V. It is de-
signed to operate on minimal power featuring a
low quiescent current, while still maintaining a
slew rate of 2.0V/碌s. To further reduce power
consumption, high value gain setting resistors
are used for the internal feedback path. The
output current for all 32 channels can be ad-
justed via two external resistors. This allows the
user to set the amount of output current during a
shorted condition. An integrated diode is also
included to help monitor die temperature.
B
YP
-V
PP
B
YP
-V
DD
B
YP
-V
NN
To internal V
PP
bus
To internal V
DD
bus
To internal V
NN
bus
Output Current Source
Limiting for all HV
OUT
Output Current Sink
Limiting for all HV
OUT
R
SOURCE
Applications
- MEMS Driver
(MicroElectroMechanical
Systems)
- Piezoelectric Transducer
Driver
- Optical Crosspoint Switches
(using MEMS technology)
R
SINK
V
PP
V
DD
V
DD
V
PP
Package Type:
V
DD
V
PP
Also available in die form
GND
V
NN
Anode
Cathode
Block Diagram
Features:
32 independent high voltage amplifiers
Output voltage up to 295V
2.0V/碌s output slew rate
Integrated feedback resistors
High value internal feedback resistors
Very low operating current
(maximum 25碌A per channel)
Integrated silicon diode for temperature
sensing
Adjustable output current limit
11/20/02
Benefits:
Saves board space.
Provides adequate movement for an optical MEMS switch
Provides adequate switching time from one line to another
Saves board space. Reduces component count and
simplifies board layout.
Minimizes power consumption and dissipation
Minimizes power consumption and dissipation
Allows for external temperature compensation or thermal
protection
Provides output short circuit protection to ground and
supply rails
+
Low Profile MQFP Gullwing
(FG)
V
IN
31
+
V
IN
1
+
HV
OUT
0
V
IN
0
-
V
NN
71R
R
HV
OUT
1
V
NN
71R
R
-
-
HV
OUT
31
71R
R
1
2
