The CA3160 is an operational amplifier that combines the
advantages of both CMOS and bipolar transistors on a
monolithic chip. The CA3160 series are frequency
compensated versions of the popular CA3130 series.
Gate protected P-Channel MOSFET (PMOS) transistors are
used in the input circuit to provide very high input
impedance, very low input current, and exceptional speed
performance. The use of PMOS field effect transistors in the
input stage results in common-mode input voltage capability
down to 0.5V below the negative supply terminal, an
important attribute in single supply applications.
A complementary symmetry MOS (CMOS) transistor-pair,
capable of swinging the output voltage to within 10mV of
either supply voltage terminal (at very high values of load
impedance), is employed as the output circuit.
The CA3160 Series circuits operate at supply voltages
ranging from 5V to 16V, or ?2.5V to ?8V when using split
supplies, and have terminals for adjustment of offset voltage
for applications requiring offset null capability. Terminal
provisions are also made to permit strobing of the output
stage.
Features
? MOSFET Input Stage Provides:
– Very High ZI . . . . . . . . . . . . . 1.5T? (1.5 x 1012?) (Typ)
– Very Low II . . . . . . . . . . . . . 5pA (Typ) at 15V Operation
. . . . . . . . . . . . . . . . . . . . . . . 2pA (Typ) at 5V Operation
? Common-Mode Input Voltage Range Includes
Negative Supply Rail; Input Terminals Can Be Swung 0.5V
Below Negative Supply Rail
? CMOS Output Stage Permits Signal Swing to Either (or
Both) Supply Rails