 English |
|
|
|
|
|
|
|
| HV257FG-G Datasheet, PDF (1/16 Pages) Supertex, Inc – 32-Channel High Voltage Sample and Hold Amplifier Array | |||
| |||
|
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 0 to 4.096V. The
input voltage can be up to 5.0V, but the output will saturate. The
maximum output voltage swing is 5.0V 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.
Typical Application Circuit
DAC
Micro
Processor
HV257
VSIG
Low Voltage
Power Supply
A0
A1
Low Voltage
A2
Channel
A3
Select
Sample
A4
and Hold
EN
High Voltage
Power Supply
HVOUT0
HVOUT1
HVOUT2
HVOUT3
32 High Voltage
OpAmp Array
HVOUT30
HVOUT31
DGND
AGND
y
x
x
y
MEMS
Array
VNN
â 1235 Bordeaux Drive, Sunnyvale, CA 94089 â Tel: 408-222-8888 â www.supertex.com
|
▷ |
German
Russian
Spanish
Italian
Polish
Chinese
Japanese
Korean
French
Portuguese