CA5420A
Data Sheet
September 1998
File Number 1925.4
0.5MHz, Low Supply Voltage, Low Input
Current BiMOS Operational Ampli鏗乪rs
The CA5420A is an integrated circuit operational ampli鏗乪r
that combines PMOS transistors and bipolar transistors on a
single monolithic chip. It is designed and guaranteed to
operate in microprocessor logic systems that use V+ = 5V,
V- = GND, since it can operate down to
鹵1V
supplies. It will
also be suitable for 3.3V logic systems.
The CA5420A BiMOS operational ampli鏗乪r features gate-
protected PMOS transistors in the input circuit to provide
very high input impedance, very low input currents (less than
1pA). The internal bootstrapping network features a unique
guardbanding technique for reducing the doubling of leakage
current for every 10
o
C increase in temperature. The
CA5420A operates at total supply voltages from 2V to 20V
either single or dual supply. This operational ampli鏗乪r is
internally phase compensated to achieve stable operation in
the unity gain follower con鏗乬uration. Additionally, it has
access terminals for a supplementary external capacitor if
additional frequency roll-off is desired. Terminals are also
provided for use in applications requiring input offset voltage
nulling. The use of PMOS in the input stage results in
common-mode input voltage capability down to 0.45V below
the negative supply terminal, an important attribute for single
supply application. The output stage uses a feedback OTA
type ampli鏗乪r that can swing essentially from rail-to-rail. The
output driving current of 1.0mA (Min) is provided by using
nonlinear current mirrors.
This device has guaranteed speci鏗乧ations for 5V operation
over the full military temperature range of -55
o
C to 125
o
C.
The CA5420A has the same 8 lead pinout used for the
industry standard 741.
Features
鈥?CA5420A at 5V Supply Voltage with Full Military
Temperature Range Guaranteed Speci鏗乧ations
鈥?CA5420A Guaranteed to Operate from
鹵1V
to
鹵10V
Supplies
鈥?2V Supply at 300碌A(chǔ) Supply Current
鈥?1pA (Typ) Input Current (Essentially Constant to 85
o
C)
鈥?Rail-to-Rail Output Swing (Drive
鹵2mA
Into 1k鈩?Load)
鈥?Pin Compatible with 741 Op Amp
Applications
鈥?pH Probe Ampli鏗乪rs
鈥?Picoammeters
鈥?Electrometer (High Z) Instruments
鈥?Portable Equipment
鈥?Inaccessible Field Equipment
鈥?Battery Dependent Equipment (Medical and Military)
鈥?5V Logic Systems
鈥?Microprocessor Interface
Ordering Information
PART NUMBER
(BRAND)
CA5420AM
(5420A)
TEMP.
RANGE (
o
C)
-55 to 125
PACKAGE
8 Ld SOIC
PKG.
NO.
M8.15
Pinout
CA5420A
(SOIC)
TOP VIEW
OFFSET 1
NULL
INV.
2
INPUT
Functional Diagram
8 STROBE
X1
-
+
7 V+
6 OUTPUT
5 OFFSET
NULL
-
MOS
BIPOLAR
+
MOS
BIPOLAR
NON-INV. 3
INPUT
V- 4
NOTE: Pin is connected to Case.
X1
BUFFER AMPS;
BOOTSTRAPPED
INPUT PROTECTION
NETWORK
HIGH GAIN
(50K)
OTA BUFFER
(X2)
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143
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Copyright
漏
Intersil Corporation 1999
INTERSIL
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