Microchip HV257 Manual


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2017 Microchip Technology Inc. DS20005827A-page 1
HV257
Features
Thirty-two 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
12 M Feedback Impedance
Layout Ideal for Die Applications
Applications
Microelectromechanical Systems (MEMS) Driver
Piezoelectric Transducer Driver
Optical Crosspoint Switches
(Using MEMS Technology)
General Description
The 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, 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 five-to-32 logic decoder. The
sampled voltage on the holding capacitor is buffered by
a low-voltage amplifier and is magnified 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 0V to 4.096V. The input voltage can be up to
5V, 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
3000 pF.
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.
Package Type
100-lead MQFP
(Top view)
1
100
See Table 3-1 for pin information.
32-Channel High-Voltage Sample-and-Hold Amplifier Array


Produkt Specifikationer

Mærke: Microchip
Kategori: Ikke kategoriseret
Model: HV257

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