Overview
The CA3140EZ, produced by Renesas Electronics America Inc., is a high-performance operational amplifier (op-amp) that combines the advantages of BiMOS technology, integrating MOSFET inputs and bipolar outputs. This device is designed for a wide range of applications requiring high input impedance, low input current, and robust output drive capabilities. The CA3140EZ is particularly suited for single supply operations and offers features such as input offset voltage nulling and built-in protection against load terminal short circuiting to either supply rail or ground.
Key Specifications
| Parameter | Symbol | CA3140 | CA3140A | Units | ||||
|---|---|---|---|---|---|---|---|---|
| Input Offset Voltage | |VIO| | - | 5 | 15 | - | 2 | 5 | mV |
| Input Offset Current | |IIO| | - | 0.5 | 30 | - | 0.5 | 20 | pA |
| Input Current | II | - | 10 | 50 | - | 10 | 40 | pA |
| Large Signal Voltage Gain | AOL | 20 | 100 | - | 20 | 100 | kV/V | |
| Common Mode Rejection Ratio | CMRR | 32 | 320 | - | 32 | 320 | - | |
| Supply Voltage | VSUPPLY | - | - | 36V (±18V) | - | - | - | |
| Bandwidth | - | - | - | - | - | 4.5 MHz |
Key Features
- MOSFET Input Stage: Very high input impedance (1.5 TΩ typical) and very low input current (10 pA typical at ±15V).
- Bipolar Output Stage: Includes built-in protection against damage from load terminal short circuiting to either supply rail or to ground.
- Input Offset Voltage Nulling: Terminals provided for input offset voltage nulling using a 10 kΩ potentiometer.
- High Voltage Operation: Can operate at supply voltages up to 36V (±18V).
- On-Chip Phase Compensation: Sufficient for unity gain voltage follower configuration.
Applications
The CA3140EZ is versatile and can be used in a variety of applications, including:
- Single Supply Operations: Suitable for applications where the input terminals need to operate down to 0.5V below the negative supply rail.
- Instrumentation: Ideal for instrumentation amplifiers due to its high input impedance and low input current.
- Audio and Video Equipment: Can be used in audio and video circuits requiring high gain and low noise.
- Medical Equipment: Suitable for medical devices that require high precision and low noise amplification).
Q & A
- What is the typical input impedance of the CA3140EZ?
The typical input impedance of the CA3140EZ is 1.5 TΩ. - What is the maximum supply voltage for the CA3140EZ?
The maximum supply voltage for the CA3140EZ is 36V (±18V). - How can the input offset voltage be nullified in the CA3140EZ?
The input offset voltage can be nullified using a 10 kΩ potentiometer connected across Terminals 1 and 5, with its slider arm connected to Terminal 4. - What is the bandwidth of the CA3140EZ?
The bandwidth of the CA3140EZ is 4.5 MHz. - Does the CA3140EZ have built-in protection against short circuits?
Yes, the CA3140EZ includes built-in protection against damage from load terminal short circuiting to either supply rail or to ground. - What type of transistors are used in the input stage of the CA3140EZ?
The input stage uses PMOS field-effect transistors. - Can the CA3140EZ be used in single supply applications?
Yes, the CA3140EZ is suitable for single supply operations and can operate with input terminals down to 0.5V below the negative supply rail. - What is the common mode rejection ratio (CMRR) of the CA3140EZ?
The CMRR of the CA3140EZ is between 32 and 320. - Is the CA3140EZ suitable for audio and video applications?
Yes, the CA3140EZ is suitable for audio and video circuits requiring high gain and low noise. - What is the typical input current of the CA3140EZ at ±15V supply voltage?
The typical input current of the CA3140EZ at ±15V supply voltage is 10 pA.
