PA79_07 Datasheet, PDF (1/5 Pages) Cirrus Logic – POWER OPERATIONAL AMPLIFIERS

MICROTECHNOLOGY
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FEATURES
• A UNIQUE (Patent Pending) TECHNIQUE FOR VERY
LOW QUIESCENT CURRENT
• OVER 350 V/µS SLEW RATE
• WIDE SUPPLY VOLTAGE
• Single Supply: 20V to 350V
• Split Supplies: +/– 10V to +/– 175V
• OUTPUT CURRENT – Per Amplifier –
150mA cont. ; 200mA Pk
• UP TO 26 WATT DISSIPATION CAPABILITY (DUAL)
• 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 unity gain bandwidth
and phase. It is important to note that the slew rate is a strong
function of input voltage amplitude. It should be noted that the
package tab needs to be connected to a stable reference
such as GND for high slew rates. Please refer to special
BLOCK DIAGRAM
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considerations section for details.
The output stages are well protected with user defined
current limit although the Safe Operating Area (SOA) must
be observed for reliable protection. Proper heatsinking is
required for maintaining maximum reliability. External phase
compensation provides the user with great flexibility in trading
gain, stability and bandwidth.
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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
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