ALFA RPAR AS3280 Dual OTA
AS3280 AS3280 CA3280 3280 ota lm13700 v13700 as13704
ALFA RPAR AS3280-DIL Dual OTA (DIL-16)
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The AS3280 is a direct replacement for the (discontinued) CA3280 used in many classic audio products.
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.
The AS3280 has all the generic characteristics of an operational voltage amplifier except that the forward transfer
characteristics is best described by transconductance rather than voltage gain, and the output is current, not voltage. The
magnitude of the output current is equal to the product of transconductance and the input voltage.
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 IABC: <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
Common Applications
- Voltage Controlled Amplifiers Oscillators
- Multipliers
- Demodulators
- Sample and Hold
- Instrumentation Amplifiers
- Function Generators
- Triangle Wave-to-Sine Wave Converters
- Comparators
- Audio Preamplifier
Package: DIL-16
References
ALFA RPAR AS3280-DIL Data Sheet
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