CA3080

CA3080

Operational Transconductance Amplifier (OTA)

Features

• Slew Rate (Unity Gain, Compensated). . . . . . . .50V/ms
• Adjustable Power Consumption. . . . . . . 10mW to 30mW
• Flexible Supply Voltage Range . . . . . . . . . . ±2V to ±15V
• Fully Adjustable Gain . . . . . . . . . . . . . .0 to gmRL Limit
• Tight gM Spread:
  • CA3080 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2:1
  • CA3080A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.6:1
• • Extended gM Linearity . . . . . . . . . . . . . . . . . . 3 Decades

Applications

• Sample and Hold
• Multiplexer
• Voltage Follower
• Multiplier
• Comparator

Description

The CA3080 and CA3080A types are Gatable-Gain Blocks which utilize the unique operational-transconductance-amplifier (OTA) concept described in Application Note ICAN-6668, “Applications of the CA3080 and CA3080A High-Performance Operational Transconductance Amplifiers”. The CA3080 and CA3080A types have differential input and a single-ended, push-pull, class A output. In addition, these types have an amplifier bias input which may be used either for gating or for linear gain control. These types also have a high output impedance and their transconductance (gM) is directly proportional to the amplifier bias current (IABC).

The CA3080 and CA3080A types are notable for their excellent slew rate (50V/ms), which makes them especially useful for multiplexer and fast unity-gain voltage followers. These types are especially applicable for multiplexer applications because power is consumed only when the devices are in the “ON” channel state.

The CA3080A is rated for operation over the full military-temperature range (-55oC to +125oC) and its characteristics are specifically controlled for applications such as sample-hold, gain-control, multiplex, etc. Operational transconductance amplifiers are also useful in programmable power-switch applications, e.g., as described in Application Note AN6048, “Some Applications of a Programmable Power Switch/Ampli-fier” (CA3094, CA3094A, CA3094B).

Pinouts

CA3080 (PDIP, SOIC) TOP VIEW

Schematic Diagram

Absolute Maximum Ratings

• Supply Voltage (Between V+ and V- Terminal). . . . . . . . . . . . . . 36V
• Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5V
• Input Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V+ to V
• Input Signal Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1mA
• Amplifier Bias Current (IABC). . . . . . . . . . . . . . . . . . . . . . . . . . . .2mA
• Power Dissipation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125mW
• Output Short Circuit Duration (Note 1) . . . . . . . . . . . . . No Limitation
• Junction Temperature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +175oC
• Junction Temperature (Plastic Package) . . . . . . . . . . . . . . . +150oC
• Lead Temperature (Soldering 10 Sec.). . . . . . . . . . . . . . . . . +300oC

Operating Conditions

Operating Temperature Range

• CA3080 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0oC to +70oC
• CA3080A. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55oC to +125oC
• Storage Temperature Range. . . . . . . . . . . . . . . . . . -65oC to +150oC

Electrical Specifications For Equipment Design, TA = +25oC, Unless Otherwise Specified

Electrical Specifications Typical Values Intended Only for Design Guidance, TA = +25oC, Unless Otherwise Specified

Electrical Specifications For Equipment Design, TA = +25oC, Unless Otherwise Indicated

Electrical Specifications Typical Values Intended Only for Design Guidance, TA = +25oC, Unless Otherwise Specified

Applications

FIGURE 19. SCHEMATIC DIAGRAM OF THE CA3080 AND CA3080A IN A UNITY-GAIN VOLTAGE FOLLOWER CONFIGURATION AND ASSOCIATED WAVEFORM

FIGURE 20. 1,000,000/1 SINGLE-CONTROL FUNCTION GENERATOR - 1MHz TO 1Hz

FIGURE 22. SCHEMATIC DIAGRAM OF THE CA3080A IN A SAMPLE-HOLD CONFIGUREATION

Микросхемы

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