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PRELIMINARY

TYPICAL APPLICATION

The typical application diagram shows a bridge connection

of the two amplifiers inside a dual PA79 and provides output

voltage swing twice that of one amplifier. Two possible situ-

ations where there is an advantage would be in applications

with low supply voltages, or applications that operate amplifiers

near their maximum voltage ratings in which a single amplifier

could not provide sufficient drive. The bridge connection also

effectively doubles the slew rate, and non-linearity becomes

symmetrical reducing second harmonic distortion in compari-

son to a single amplifier circuit.

EXTERNAL CONNECTIONS - DK PACKAGE

FEATURES

• A UNIQUE (Patent Pending) TECHNIQUE FOR VERY

LOW QUIESCENT CURRENT < 1 mA

• OVER 350 V/µS SLEW RATE

• WIDE SUPPLY VOLTAGE

• Single Supply: 10V to 350V

• Split Supplies: +/- 10V to +/- 175V

• OUTPUT CURRENT- 150mA cont. ; 200mA Pk

• DUAL AMPLIFIER

• UP TO TBD WATT DISSIPATION CAPABILITY

• OVER 200 kHz POWER BANDWIDTH

APPLICATIONS

• PIEZOELECTRIC POSITIONING AND ACTUATION

• ELECTROSTATIC DEFLECTION

• DEFORMABLE MIRROR ACTUATORS

• CHEMICAL AND BIOLOGICAL STIMULATORS

DESCRIPTION

The PA79 is a dual high voltage, high speed Precision IC

power op amp with performance and unique features not

found previously in any commercially available OpAmp. This

approach provides a cost-effective, high density solution to

applications where multiple amplifiers are required.

Novel input stage design of this amplifier provides extremely

high slew rates in pulse applications while maintaining low

quiescent current of under 1mA. This novel input stage also

has the effect of adding variables to the power response and

slew rate characteristics of the amplifier. To a lesser degree,

there are also input related effects on open loop gain and

phase. It is important to note that slew rate for the PA79 is

independent of supply current. However the slew rate is a

strong function of input voltage amplitude.

The output stages are well protected with user defined

current limit although the Safe Operating Area (SOA) must

be observed for reliable protection. Proper heat sinking is

required for maintaining maximum reliability. External phase

compensation provides the user with great flexibility in trading

gain, stability and bandwidth.

M I C R O T E C H N O L O G Y

PA79

20-PIN PSOP

PACKAGE STYLE DK

NOTES:

1. The package heat slug needs to be connected to a stable reference such as gnd

for high slew rates. Please refer to special considerations section for details.

2. Supply bypassing required for –Vs and +Vs.

3. For Cc and Rc values refer to power supply biasing section.

4. Dimple and ESD triangle denotes pin 1.