CA3080E

CA3080E - Operational Transconductance Amplifier (OTA)

Overview

The CA3080E is a high-performance Operational Transconductance Amplifier (OTA) manufactured by Intersil Corporation. This versatile component is designed for applications requiring adjustable gain, low power consumption, and flexible supply voltage ranges. The CA3080E is particularly well-suited for analog signal processing, offering excellent linearity and a wide dynamic range. Its transconductance (g_M) can be precisely controlled, making it ideal for use in voltage-controlled amplifiers, filters, and modulators.

The device is available in multiple package options, including PDIP, SOIC, and metal can, providing flexibility for various design requirements. With its robust performance and adaptability, the CA3080E is widely used in industrial, communication, and instrumentation systems.

Features

• High Slew Rate: 50V/µs (Unity Gain, Compensated)
• Adjustable Power Consumption: Ranges from 10µW to 30µW
• Wide Supply Voltage Range: Operates from ±2V to ±15V
• Fully Adjustable Gain: Programmable from 0 to g_MR_L Limit
• Tight Transconductance (g_M) Spread:
  • CA3080: 2:1 ratio
  • CA3080A: 1.6:1 ratio (improved consistency)
• Extended g_M Linearity: Maintains linearity across 3 decades of input signal

Applications

The CA3080E is a highly versatile component suitable for a broad range of analog applications, including:

• Sample and Hold Circuits: Provides precise signal capture and retention.
• Analog Multipliers: Enables multiplication of two analog signals with high accuracy.
• Multiplexers: Facilitates switching between multiple input signals.
• Voltage Comparators: Delivers fast response times for threshold detection.
• Voltage Followers: Acts as a buffer to isolate stages while maintaining signal integrity.
• Voltage-Controlled Amplifiers (VCAs): Adjusts gain dynamically based on control voltage.
• Analog Filters: Used in tunable active filter designs.

Electrical Characteristics

The following table summarizes key electrical specifications of the CA3080E under typical operating conditions (±15V supply, unless otherwise noted):

• Transconductance (g_M): 9.6mS (typical)
• Input Bias Current: 500nA (max)
• Input Offset Voltage: 5mV (max)
• Output Current: ±1.5mA (max)
• Bandwidth (Unity Gain): 2MHz (typical)
• Power Consumption: Adjustable from 10µW to 30µW
• Common-Mode Rejection Ratio (CMRR): 90dB (typical)

Package Information

The CA3080E is available in multiple package configurations to suit different assembly and thermal requirements:

• 8-Pin Plastic Dual In-Line Package (PDIP):
  • Standard through-hole mounting
  • Wide availability and ease of prototyping
• 8-Pin Small Outline IC (SOIC):
  • Surface-mount design for compact PCB layouts
  • Ideal for automated assembly processes
• 8-Pin Metal Can Package (TO-99):
  • Enhanced thermal performance
  • Used in high-reliability and military applications

Pin Configuration

The pinout for the CA3080E varies slightly depending on the package type:

• PDIP/SOIC (Top View):
  • Pin 1: Non-Inverting Input (+IN)
  • Pin 2: Inverting Input (-IN)
  • Pin 3: Bias Current Input (I_ABC)
  • Pin 4: Negative Supply (V_-)
  • Pin 5: Output (OUT)
  • Pin 6: Positive Supply (V₊)
  • Pin 7: Not Connected (NC)
  • Pin 8: Not Connected (NC)
• Metal Can (TO-99, Top View):
  • Pin 1: Bias Current Input (I_ABC)
  • Pin 2: Inverting Input (-IN)
  • Pin 3: Non-Inverting Input (+IN)
  • Pin 4: Negative Supply (V_-)
  • Pin 5: Output (OUT)
  • Pin 6: Positive Supply (V₊)
  • Pin 7: Not Connected (NC)
  • Pin 8: Case (Ground, if required)

Ordering Information

The CA3080E is available in different part numbers based on temperature range and packaging:

• CA3080E: Standard commercial temperature range (0°C to +70°C)
• CA3080AE: Improved g_M consistency variant
• CA3080M: Military-grade temperature range (-55°C to +125°C)

Typical Performance Curves

The datasheet includes several performance graphs to assist in design considerations:

• Transconductance vs. Bias Current: Shows linearity across control current range.
• Frequency Response: Illustrates bandwidth under varying gain settings.
• Input-to-Output Capacitance vs. Supply Voltage: Important for high-frequency stability.

Design Considerations

When implementing the CA3080E, consider the following:

• Bias Current (I_ABC): Directly controls g_M; use a stable current source.
• Supply Decoupling: 0.01µF capacitors near supply pins are recommended.
• Thermal Management: Metal can package preferred for high-power applications.