PA79 Datasheet, PDF (1/4 Pages) Cirrus Logic – POWER OPERATIONAL AMPLIFIERS

MICROTECHNOLOGY
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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
20-Pin PSOP
PACKAGE STYLE DK
• UP TO TBD WATT DISSIPATION CAPABILITY
• OVER 200 kHz POWER BANDWIDTH
APPLICATIONS
• PIEZOELECTRIC POSITIONING AND ACTUATION
Y _{• ELECTROSTATIC DEFLECTION}
• DEFORMABLE MIRROR ACTUATORS
R ^{• CHEMICAL AND BIOLOGICAL STIMULATORS}
DESCRIPTION
The PA79 is a dual high voltage, high speed Precision IC
A _{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
IN 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
IM ^{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
L strong function of input voltage amplitude.
The output stages are well protected with user defined
current limit although the Safe Operating Area (SOA) must
E ^{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
PR ^{gain, stability and bandwidth.}
TYPICAL APPLICATION
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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
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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.
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