LM747CN

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LM747CN: General Purpose Dual Operational Amplifier

Overview

The LM747CN is a general-purpose dual operational amplifier featuring two independent op-amps in a single package. The amplifiers share common bias networks and power supply connections while maintaining fully independent operation. This device is designed for a wide range of analog applications requiring high performance and reliability.

Manufactured using a bipolar process, the LM747CN offers excellent performance characteristics while maintaining stability across its operating range. The dual op-amp configuration makes it particularly useful in applications requiring matched amplifier pairs or where board space is at a premium.

Features

• Dual operational amplifier in single package
• No latch-up when common mode range is exceeded
• Excellent immunity to oscillations
• Wide common-mode and differential voltage ranges
• Low power consumption
• No frequency compensation required
• Short-circuit protection
• Wide power supply range: ±5V to ±18V
• Large output voltage swing
• Low input bias and offset currents

Applications

The LM747CN is suitable for a wide variety of analog circuit applications including:

• Active filters and equalizers
• Instrumentation amplifiers
• Signal conditioning circuits
• Voltage followers
• Summing amplifiers
• Integrators and differentiators
• Precision rectifiers
• Oscillators and waveform generators
• ADC/DAC interfaces
• Industrial control systems

Electrical Characteristics

The following specifications are typical at V_CC = ±15V and T_A = 25°C unless otherwise noted:

Input Characteristics

• Input Offset Voltage: 2mV (max)
• Input Bias Current: 80nA (max)
• Input Offset Current: 20nA (max)
• Input Resistance: 2MΩ (min)
• Input Voltage Range: ±12V (min)
• Common Mode Rejection Ratio: 90dB (min)

Output Characteristics

• Output Voltage Swing: ±13V (min) into 10kΩ
• Output Short Circuit Current: 25mA (max)
• Output Resistance: 75Ω (typ)

Dynamic Characteristics

• Large Signal Voltage Gain: 50V/mV (min)
• Bandwidth: 1MHz (typ)
• Slew Rate: 0.5V/μs (typ)
• Rise Time: 0.3μs (typ)
• Settling Time: 2μs (typ)

Power Supply Characteristics

• Supply Voltage Range: ±5V to ±18V
• Supply Current (per amplifier): 1.7mA (typ)
• Power Supply Rejection Ratio: 96dB (min)

Package Information

The LM747CN is available in a standard 14-pin PDIP (Plastic Dual In-line Package) with the following mechanical specifications:

• Package Type: PDIP-14
• Package Dimensions: 19.3mm x 6.35mm x 4.57mm
• Lead Pitch: 2.54mm (0.1 inch)
• Lead Count: 14
• Lead Material: Copper Alloy
• Lead Finish: Matte Tin
• Operating Temperature Range: 0°C to +70°C
• Storage Temperature Range: -65°C to +150°C
• Moisture Sensitivity Level (MSL): 1 (Unlimited)

Pin Configuration

The pinout for the LM747CN is as follows:

• Pin 1: Output A
• Pin 2: Inverting Input A
• Pin 3: Non-Inverting Input A
• Pin 4: V- (Negative Power Supply)
• Pin 5: Non-Inverting Input B
• Pin 6: Inverting Input B
• Pin 7: Output B
• Pin 8: V+ (Positive Power Supply)
• Pins 9-14: No Connection

Design Considerations

When designing with the LM747CN, consider the following guidelines:

Power Supply Decoupling

Proper power supply decoupling is essential for stable operation. Place 0.1μF ceramic capacitors as close as possible to the power supply pins (pins 4 and 8). For applications with long power supply leads or noisy environments, additional 1-10μF electrolytic capacitors may be required.

PCB Layout

Maintain good PCB layout practices to minimize noise and ensure stability:

• Keep input traces short and away from output traces
• Use ground planes where possible
• Minimize parasitic capacitance at high impedance nodes
• Route power supply traces with adequate width for current requirements

Thermal Considerations

While the LM747CN has modest power dissipation, thermal management should still be considered in high-temperature environments or when operating near maximum supply voltages. Ensure adequate airflow and consider heat sinking if necessary.

Reliability and Quality

The LM747CN is manufactured under strict quality control standards with the following reliability characteristics:

• ESD Protection: 1kV Human Body Model
• MTBF: >1,000,000 hours at 25°C
• Qualified to industrial temperature standards
• RoHS compliant

Alternative Parts

For applications requiring different specifications or package options, consider these alternatives:

• LM747CJ: Ceramic DIP package
• LM747H: Metal can package
• LM747E: Enhanced performance version
• LM358: Single supply dual op-amp
• LM1458: Similar dual op-amp with different characteristics

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