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HV257FG-G

Description
SAMPLE AND HOLD AMPLIFIER, 4 us ACQUISITION TIME, PQFP100
Categorysemiconductor    Analog mixed-signal IC   
File Size1MB,16 Pages
ManufacturerSUTEX
Websitehttp://www.supertex.com/
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HV257FG-G Overview

SAMPLE AND HOLD AMPLIFIER, 4 us ACQUISITION TIME, PQFP100

HV257FG-G Parametric

Parameter NameAttribute value
Number of functions1
Number of terminals100
Maximum supply/operating voltage8 V
Maximum negative supply voltage-7 V
Processing package description20 × 14 MM, 3.15 MM HEIGHT, 0.65 MM PITCH, GREEN, MS-022GC-2, MQFP-100
Lead-freeYes
EU RoHS regulationsYes
stateACTIVE
packaging shapeRectangle
Package SizeFLATPACK
surface mountYes
Terminal formGULL WING
Terminal spacing0.6500 mm
terminal coatingMATTE Tin
Terminal locationFour
Packaging MaterialsPlastic/Epoxy
Amplifier typesample and hold circuit
maximum rate of descent6 V/s
Rated acquisition time4 us
Sample and hold and track and holdSAMPLE
HV257
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
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, V
DD
and
V
NN
.
All 32 sample and hold circuits share a common analog input,
V
SIG
. 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 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 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
MEMS (microelectromechanical systems) driver
Piezoelectric transducer driver
Optical crosspoint switches (using MEMS
technology)
Typical Application Circuit
HV257
DAC
VSIG
High Voltage
Power Supply
HV
OUT
0
Low Voltage
Power Supply
HV
OUT
1
y
x
y
x
HV
OUT
2
HV
OUT
3
32
Micro
Processor
A
0
A
1
A
2
A
3
A
4
EN
RSOURCE
RSINK
Low Voltage
Channel
Select
Sample
and Hold
High Voltage
OpAmp Array
HV
OUT
30
HV
OUT
31
AGND
MEMS
Array
DGND
VNN
1235 Bordeaux Drive, Sunnyvale, CA 94089
Tel: 408-222-8888
www.supertex.com
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