CA3420 Datasheet | Intersil

CA3420, CA3420A Data Sheet April 2000 File Number 0.5MHz, Low Supply Voltage, Low Input Current Bi MOS Operational Amplifiers The CA3420A and CA3420 are integrated circuit operational amplifiers that bine PMOS transistors and bipolar transistors on a single monolithic chip. The CA3420A and CA3420 Bi MOS operational amplifiers feature gate protected PMOS transistors in the input circuit to provide very high input impedance, very low input currents (less than 1p A). The internal bootstrapping network Features a unique guardbanding technique for reducing the doubling of leakage current for every 10o 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 pensated 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 mon 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 1.5m A (Min) is provided by using nonlinear current mirrors. Features - 2V Supply at 300µA Supply Current - 1p A Input Current (Typ) (Essentially Constant to 85o C) - Rail-to-Rail Output Swing (Drive ±2m A into 1kΩ Load) - Pin patible with 741 Operational Amplifiers Applications - p H 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...