CA3420, CA3420A
TM
Data Sheet
April 2000
File Number
1320.6
0.5MHz, Low Supply Voltage, Low Input
Current BiMOS Operational Amplifiers
The CA3420A and CA3420 are integrated circuit operational
amplifiers that combine PMOS transistors and bipolar
transistors on a single monolithic chip. The CA3420A and
CA3420 BiMOS operational amplifiers 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 10
o
C increase in temperature. The CA3420
series operates at total supply voltages from 2V to 20V
either single or dual supply. These operational amplifiers are
internally phase compensated to achieve stable operation in
the unity gain follower configuration. 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 amplifier that can swing essentially from rail-to-rail. The
output driving current of 1.5mA (Min) is provided by using
nonlinear current mirrors.
Features
• 2V Supply at 300µA Supply Current
• 1pA Input Current (Typ) (Essentially Constant to 85
o
C)
• Rail-to-Rail Output Swing (Drive
±2mA
into 1kΩ Load)
• Pin Compatible with 741 Operational Amplifiers
Applications
• pH Probe Amplifiers
• Picoammeters
• Electrometer (High Z) Instruments
• Portable Equipment
• Inaccessible Field Equipment
• Battery-Dependent Equipment (Medical and Military)
Functional Diagram
X1
-
MOS
BIPOLAR
Ordering Information
PART NUMBER
CA3420AT
CA3420E
TEMP.
RANGE (
o
C)
-55 to 125
-55 to 125
PACKAGE
8 Pin Metal Can
8 Ld PDIP
PKG.
NO.
T8.C
E8.3
X1
+
MOS
BIPOLAR
BUFFER AMPS;
BOOTSTRAPPED
INPUT PROTECTION
NETWORK
HIGH GAIN
(50K)
OTA BUFFER
(X2)
Pinouts
CA3420 (PDIP)
TOP VIEW
1
2
3
4
8 STROBE
CA3420 (METAL CAN)
TOP VIEW
TAB
STROBE
7 V+
+
8
1
OFFSET NULL
INV.
INPUT
NON-INV.
INPUT
V-
OFFSET NULL
INV.
2
INPUT
-
+
7 V+
6 OUTPUT
5 OFFSET NULL
-
6 OUTPUT
5 OFFSET NULL
NON-INV. 3
INPUT
4
V-
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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Intersil Corporation 2000
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