ALFA RPAR AS3280-SMT Dual OTA (SOIC-16)

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The AS3280 is a direct replacement for the (discontinued) CA3280 used in many classic audio products. Note that this device is in SMT packaging (SOIC-16) and requires a SOIC-DIL adapter kit to be used in through-hole (DIL) applications.

The AS3280 consists of two variable operational amplifiers that are designed to substantially reduce the initial input offset voltage and the offset voltage variation with respect to changes in programming current. This design results in reduced "AGC thump," an objectionable characteristic of many AGC systems. Careful design of critical places of the circuit reduces the amplifier dependence upon thermal and processing variables.

This type of operational transconductance amplifier has gained wide acceptance as a gateable, gain controlled building block for instrumentation and audio applications, such as linearization of transducer outputs, standardization of widely changing signals for data processing, multiplexing, instrumentation amplifiers operating from the nanopower range to high current and high speed comparators.

Features

• Low Initial Input Offset Voltage: 1.8mV (Max)
• Low Offset Voltage Change vs I_ABC: <500 µV (Typ)
• Low Offset Voltage Drift: 5µV/°C (Typ)
• Excellent matching of the two amplifiers in the package for all characteristics
• Internal current-driven linearizing diodes reduce the external input current to an offset component
• Flexible Supply Voltage Range ±2V to ±15V

• Voltage Controlled Amplifiers Oscillators
• Multipliers
• Demodulators
• Sample and Hold
• Instrumentation Amplifiers
• Function Generators
• Triangle Wave-to-Sine Wave Converters
• Comparators
• Audio Preamplifier

References