Microchip HV257 Handleiding

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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 MΩ F

eedback Impedance

•Layout Ideal for Die Applications

Applications

•Microelectromechanical Systems (MEMS) Driver

•Piezoelectric Transducer Driver

•Optical Crosspoint Switches

(Using MEMS T

echnology)

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, V

DD

and V

NN

.

All 32 sample-and-hold circuits share a common

an

alog input, V

SIG

. 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 V

PP

high-voltage supply.

The outputs can drive capacitive loads of up to

3000 pF.

The maximum output source and sink current can be

ad

justed 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.

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

Product specificaties