on November 20th 57

CA3140 Op-Amp: Features, Circuit, and Pinout

The article introduces the CA3140 operational amplifier, renowned for its innovative BiMOS technology which blends MOSFET inputs with bipolar transistor outputs. This combination offers high input impedance and low input current, optimizing performance across diverse electronic applications.

Catalog

What is the CA3140?

The CA3140 operational amplifier captures attention with its distinctive blend of PMOS and bipolar transistor technology. This architecture is crafted to achieve impressive input impedance and minimal input current, facilitated by the PMOS input for precise measurements in sensitive applications. The unique design authorizes quick response times, highly desirable in dynamic situations, while offering versatile power supply options. It accommodates voltages between 4V and 36V, maintaining performance consistency. The phase compensation ensures operational stability, finding a perfect equilibrium between speed and reliability. Zero input offset voltage is especially great in precision engineering applications, and the CA3140 excels here due to its inventive design. By reducing offsets, it enhances feedback circuit accuracy in tasks like analog signal processing, where minor inaccuracies can escalate to errors over time. This trait is exceptionally valued in sectors such as biomedical instrumentation and industrial control systems, where reliability is non-negotiable.

CA3140 Pin Configuration

CA3140 Symbol, Footprint, and CAD Model

Features of the CA3140

• High Input Impedance: Approx. 1.5TΩ due to its MOSFET input stage.

• Low Input Current: Only 10pA, ideal for high-impedance sources.

• Wide Input Range: Operates up to 0.5V below the negative supply voltage, offering flexibility in diverse applications.

• 741 Op-Amp Compatibility: Direct substitute, reducing the need for circuit redesign.

• RoHS-Compliant: Lead-free and environmentally friendly, meeting modern standards.

• Versatile & Reliable: Ideal for precise, sensitive, and adaptable analog circuit designs.

CA3140 Technical Specifications

Technical specifications, features, parameters, and components with comparable characteristics to the Intersil (Renesas Electronics America) CA3140E.

Type	Parameter
Contact Plating	Lead, Tin
Package / Case	DIP
Published	1988
Pbfree Code	no
Terminal Finish	Tin/Lead (Sn/Pb)
Min Operating Temperature	-55°C
Peak Reflow Temperature (Cel)	NOT SPECIFIED
Supply Voltage	15V
Time@Peak Reflow Temperature-Max (s)	NOT SPECIFIED
Qualification Status	Not Qualified
Temperature Grade	MILITARY
Min Supply Voltage	4V
Supply Current-Max	6mA
Architecture	VOLTAGE-FEEDBACK
Mount	Through Hole
Number of Pins	8
JESD-609 Code	e0
ECCN Code	EAR99
Max Operating Temperature	125°C
Terminal Position	DUAL
Number of Functions	1
Terminal Pitch	2.54mm
Pin Count	8
Operating Supply Voltage	9V
Max Supply Voltage	36V
Operating Supply Current	4mA
Slew Rate	9 V/μs
Amplifier Type	OPERATIONAL AMPLIFIER
Common Mode Rejection Ratio	90 dB
Output Current per Channel	40mA
Gain Bandwidth Product	3.7MHz
Unity Gain BW-Nom	4500 kHz
Low-Offset	NO
Max Dual Supply Voltage	18V
Min Dual Supply Voltage	2V
Dual Supply Voltage	9V
Height	4.95mm
Width	7.11mm
RoHS Status	RoHS Compliant
Current - Input Bias	10pA
Input Offset Voltage (Vos)	5mV
Neg Supply Voltage-Nom (Vsup)	-15V
Voltage Gain	100dB
Frequency Compensation	YES
Low-Bias	YES
Bias Current-Max (IIB) @25C	0.00005μA
Number of Amplifiers	1
Length	10.16mm
REACH SVHC	No SVHC

Schematic Diagram of the CA3140

Block Diagram of the CA3140

Operating Principles of the CA3140

The image depicts a schematic of a current amplifier circuit utilizing a CA3140 operational amplifier, designed to monitor and amplify load current with the capability of adjusting amplification through resistive feedback, making it suitable for precision current measurement applications.

Amplifying Volts and Harmonizing with References

The CA3140 operational amplifier excels in the art of voltage amplification, harmonizing input with a specific reference. This capability becomes a core in settings where precise voltage readings are cherished, such as with sensor interfaces or lab instruments. You can appreciate the low input bias current and high input impedance, which work diligently to minimize interference and preserve the purity of the signal, enhancing both accuracy and reliability.

Enhancing Current and Playing with Resistance

The CA3140's talent for augmenting load current by manipulating chosen resistance values makes it a player in scenarios requiring discerning current measurement, frequently seen in automation and control systems of the industrial realm. With practical usage, carefully selected resistor values are applied to achieve the desired current boost while maintaining circuit stability, allowing the amplifier to deftly adapt to various load situations in dynamic testing.

Stabilizing with Capacities and Easing Oscillations

Incorporating capacitive elements within the CA3140's framework is central to strengthening circuit stability and curtailing the risk of unwanted high-frequency oscillations. For high-output demands, such as in audio processing or communications, these capacitive parts ensure signal clarity by smoothing out fluctuations, preventing potential inefficiencies or distortions.

Where Can the CA3140 Be Applied?

Voltage Followers and Buffers

The CA3140 shines in situations where signal buffering and voltage following are needed, thanks to its excellent high input impedance and remarkably low output impedance. These attributes are advantageous in contexts where maintaining signal tenacity is important. Take audio signal processing as an example, preserving minimal distortion for a desirable output, and the CA3140 effectively ensures this consistency in quality.

Comparators and Amplifiers

As a comparator, the CA3140 adeptly handles extensive ranges of input signals, delivering precise voltage level detections. Its function is central to circuits necessitating signal comparison for decision-making processes, such as those within control systems. Furthermore, when deployed as an amplifier, the CA3140's swift response facilitates quick signal amplification without substantial delay in fast-paced, dynamic applications.

Adders and Custom Designs

The adaptability of the CA3140 permits its integration into more intricate configurations like adders, where it adeptly merges multiple input signals. This capability proves in analog computing circuits, where precision in combining analog signals is an important aspect.

Using the CA3140 Operational Amplifier

A notable characteristic of the CA3140 is its dual Offset Null pins (pins 1 and 5). These pins are instrumental in addressing offset errors, a frequent issue in precision signal processing. Offset errors manifest when the anticipated zero output of an Op-Amp, given a zero voltage difference between inverting and non-inverting inputs, deviates from zero, potentially skewing signal output and causing inaccuracies in delicate measurements. By introducing an offset voltage to these pins, the output can be realigned to the intended zero level, thereby improving measurement reliability.

Offset correction can be realized by connecting a potentiometer between the Offset Null pins, allowing for adjustable offset voltage aligned with specific application needs. This hands-on approach not only corrects errors but also opens up opportunities to explore the CA3140's versatility, encouraging innovative developments in analog signal processing. Thoughtful execution of offset correction highlights the synergy between precision adjustments and achieving target system outputs, a principle echoed across various technical disciplines.

The picture below shows a test circuit of the CA3140 operational amplifier, detailing its connection to power supplies, input and feedback components, and simulated load parameters including bandwidth and slew rate.

Advanced Utilization of CA3140

Operational Amplification in Automotive and Portable Meters

The CA3140 excels in single-supply operations, providing ground-referenced amplification that enhances its application in both automotive systems and portable meters. It offers precision and reliability, which play a role in interpreting vehicle sensor data and facilitating portable diagnostics. This ensures accuracy, even when faced with diverse environmental conditions.

High-Performance Sample and Hold Amplifiers

As a sample and hold amplifier, the CA3140 achieves impressive high-speed sampling rates, imperative for capturing transient signals without distortion. It is extensively employed in digital signal processing, enabling stable signal acquisition. Such precision is integral for systems relying on swift and accurate data capture.

Versatile Long Duration Timers

Acting as a timer/multivibrator, the CA3140 manages durations ranging from microseconds to hours. This timing flexibility supports diverse applications, from timing in electronic processes to managing power cycles in industrial settings, demonstrating its adaptability across various systems.

Sensitivity in Photocurrent Measurement

Used as a photocurrent meter, the CA3140 detects low-level light signals with outstanding sensitivity. This capability is use in scientific instruments like photometers, where precise light measurement is needed. It provides accurate assessments under varying lighting conditions.

Precise Peak Detection

In peak detection applications, the CA3140 identifies maximum signal levels with minimal distortion. This is important in audio processing and radio frequency applications, ensuring the integrity of peak level readings, which is good for communication systems and audio engineering.

Dynamic Active Filters

Utilized as an active filter, the CA3140 is great in refining audio signals and filtering out unwanted frequencies. This application is used in audio processing equipment, where clarity and purity in sound reproduction are important, ensuring high-quality sound output.

Reliable Comparators for Decision-Making

As a comparator in decision-making circuits, the CA3140 ensures accurate digital outputs from analog signals. In automation systems, this precise comparison enhances system responses and operational efficiency, impacting decision-making processes.

Optimizing Interfaces in Low Voltage Systems

The CA3140 facilitates interfacing in 5V TTL and other low voltage systems, boosting compatibility across various electronic devices. By enabling seamless communication between components with different voltage standards, it simplifies design, especially in electronics focused on power efficiency.

Diverse Operational Amplifier Applications

Beyond its specific applications, the CA3140 meets broad operational amplifier needs, supporting activities like signal conditioning, amplification, and mathematical operations. It underpins numerous systems commonly found in commercial and personal technology settings.

Consistent Function Generator Designs

In function generator designs, the CA3140 assists in crafting precise waveforms, benefiting both educational labs and electronic testing environments. It offers consistent and accurate opportunities for exploring and troubleshooting various signal configurations.

Tone Control Capabilities

Through managing frequency balance, the CA3140 supports tone control circuits, making it good in audio amplification systems. Its ability to adjust bass, mid-range, and treble frequencies in entertainment setups.

Stable Power Supply Management

The CA3140 plays a role in power supply regulation, delivering stable output amidst input or load changes. This application is great for maintaining the reliability of power delivery in sensitive electronic devices.

Development in Portable Instrumentation

Incorporation into portable instruments allows for miniaturization without loss of performance, an important factor for modern gadgets and diagnostic tools. The CA3140 enables to innovate, maintaining functionality in compact designs.

Effective Intrusion Detection and Alarm Systems

In intrusion alarm systems, the CA3140 enables rapid signal processing, for detecting threats promptly. Its integration enhances security measures by improving the response time and accuracy, contributing to safer environments.

Package for CA3140

Manufacturer of the CA3140

The CA3140 operational amplifier, originally crafted by Intersil and now under the stewardship of Renesas Electronics, symbolizes growth in semiconductor innovation. Intersil's impressive history highlights its groundbreaking contributions to power management and precision simulation technologies. Their expertise caters to automotive, telecommunications, and aerospace sectors, addressing various needs that demand precision and reliability. The CA3140 stands as a standard for dependability across varying operational scenarios, marrying historical legacy with innovative potential.

Datasheet PDF

CA3140E Datasheets:

CA3140(A).pdf

Label Change-All Devices 01/Dec/2022.pdf