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CA3420AT Datasheet(PDF) 1 Page - Intersil Corporation

Part No. CA3420AT
Description  0.5MHz, Low Supply Voltage, Low Input Current BiMOS Operational Amplifiers
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Maker  INTERSIL [Intersil Corporation]
Homepage  http://www.intersil.com/cda/home
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 1 page
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1
TM
File Number
1320.6
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143
| Intersil and Design is a trademark of Intersil Corporation. | Copyright
Ā© Intersil Corporation 2000
CA3420, CA3420A
0.5MHz, Low Supply Voltage, Low Input
Current BiMOS Operational Ampliļ¬ers
The CA3420A and CA3420 are integrated circuit operational
ampliļ¬ers that combine PMOS transistors and bipolar
transistors on a single monolithic chip. The CA3420A and
CA3420 BiMOS operational ampliļ¬ers feature 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 10oC increase in temperature. The CA3420
series operates at total supply voltages from 2V to 20V
either single or dual supply. These operational ampliļ¬ers are
internally phase compensated to achieve stable operation in
the unity gain follower conļ¬guration. Additionally, they have
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 ampliļ¬er that can swing essentially from rail-to-rail. The
output driving current of 1.5mA (Min) is provided by using
nonlinear current mirrors.
Features
ā€¢ 2V Supply at 300
ĀµA Supply Current
ā€¢ 1pA Input Current (Typ) (Essentially Constant to 85oC)
ā€¢ Rail-to-Rail Output Swing (Drive
Ā±2mA into 1kā„¦ Load)
ā€¢ Pin Compatible with 741 Operational Ampliļ¬ers
Applications
ā€¢ pH Probe Ampliļ¬ers
ā€¢ Picoammeters
ā€¢ Electrometer (High Z) Instruments
ā€¢ Portable Equipment
ā€¢ Inaccessible Field Equipment
ā€¢ Battery-Dependent Equipment (Medical and Military)
Functional Diagram
Pinouts
CA3420 (PDIP)
TOP VIEW
CA3420 (METAL CAN)
TOP VIEW
Ordering Information
PART NUMBER
TEMP.
RANGE (oC)
PACKAGE
PKG.
NO.
CA3420AT
-55 to 125
8 Pin Metal Can
T8.C
CA3420E
-55 to 125
8 Ld PDIP
E8.3
MOS
BIPOLAR
X1
X1
MOS
BIPOLAR
OTA BUFFER
(X2)
HIGH GAIN
(50K)
BUFFER AMPS;
BOOTSTRAPPED
INPUT PROTECTION
NETWORK
-
+
1
2
3
4
8
7
6
5
+
V+
OFFSET NULL
INV.
INPUT
V-
NON-INV.
INPUT
STROBE
OUTPUT
OFFSET NULL
-
OUTPUT
OFFSET NULL
4
6
1
3
7
5
8
+
STROBE
V+
V-
NON-INV.
INPUT
INV.
INPUT
TAB
OFFSET NULL
2
-
Data Sheet
April 2000




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