Product description
The CA3140 is a BiMOS operational amplifier that combines the advantages of high-voltage PMOS transistors in the input stage with bipolar transistors in the output stage, integrated on a single monolithic chip. With a MOSFET input, it offers very high input impedance, low input current, and high speed. The amplifier operates with supply voltages from 4 V to 36 V (single or dual supply) and is internally phase-compensated for stable unity-gain operation. An external capacitor can be connected for additional frequency roll-off. Dedicated pins allow input offset voltage nulling.
The PMOS input stage supports input signals as low as 0.5 V below the negative supply rail, making it well-suited for single-supply applications. The bipolar output stage includes built-in protection against short circuits to either supply rail or ground.
Features:
- MOSFET input stage
- Very high input impedance: typ. 1.5 TΩ
- Very low input current: typ. 10 pA at ±15 V
- Wide common-mode input voltage range: down to 0.5 V below the negative rail
- Output swing complements input range
- Direct replacement for standard 741 in most applications
Applications:
- Ground-referenced single-supply amplifiers in automotive and portable equipment
- Sample and hold amplifiers
- Long-duration timers and multivibrators
- Photocurrent instrumentation
- Peak detectors
- Active filters
- Comparators
- Interface for 5 V TTL and other low-voltage systems
- All standard operational amplifier applications
- Function generators
- Tone controls
- Power supplies
- Portable instruments
- Intrusion alarm systems
