CA3290

CA3290, CA3290A Data Sheet September 1998 File Number 1049.3 BiMOS Dual Voltage Comparators with MOSFET Input, Bipolar Output The CA3290A and CA3290 types consist of a dual voltage comparator on a single monolithic chip. The common mode input voltage range includes ground even when operated from a single supply. The low supply current drain makes these comparators suitable for battery operation; their extremely low input currents allow their use in applications that employ sensors with extremely high source impedances. Package options are shown in the table below. Features MOSFET Input Stage - Very High Input Impedance (ZIN) . . . . . . . . 1.7TΩ (Typ) - Very Low Input Current at V+ = 5V . . . . . . . 3.5pA (Typ) - Wide Common Mode Input Voltage Range (VICR) Can Be Swung 1.5V (Typ) Below Negative Supply Voltage Rail - Virtually Eliminates Errors Due to Flow of Input Currents Output Voltage Compatible with TTL, DTL, ECL, MOS, and CMOS Logic Systems in Most Applications Applications High Source Impedance Voltage Comparators Long Time Delay Circuits Square Wave Generators A/D Converters Window Comparators Pinout CA3290/A (PDIP) TOP VIEW OUTPUT (A1) 1 INV. INPUT (A1) 2 NON-INV. INPUT (A1) 3 V- 4 A1 8 V+ +A2 7 OUTPUT (A2) Schematic Diagram (ONLY ONE IS SHOWN) BIASING CIRCUIT FOR CURRENT SOURCES COMPARATOR NO. 1 V+ D1 D2 Q1 +VI -VI Q2 Q3 1 -+ 6 INV. INPUT (A2) 5 NON-INV. INPUT (A2) Ordering Information PART NUMBER CA3290AE CA3290E TEMP RANGE (oC) -55 to 12...