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Product Description
Manufacturer Part Number: P-Q-AS3280
The AS3280 is Alfa's version of the CA3280 IC. 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 since 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.
The AS3280 is available in a 16-pin DIP package.
Features
Applications
The AS3280 is Alfa's version of the CA3280 IC. 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 since 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.
The AS3280 is available in a 16-pin DIP package.
Features
- Low Initial Input Offset Voltage: 1.8mV (Max)
- Low Offset Voltage Change vs IABC: <500 µV (Typ)
- Low Offset Voltage Drift: 5µV/°C
- Excellent Matching of the Two Amplifiers for All Characteristics
- Internal Current-Driven Linearizing Diodes Reduce the External Input Current to an Offset Component
- Flexible Supply Voltage Range: ±2V to ±15V
Applications
- Voltage Controlled Amplifiers
- Oscillators
- Multipliers
- Demodulators
- Sample and Hold
- Instrumentation Amplifiers
- Function Generators
- Triangle Wave-to-Sine Wave Converters
- Comparators
- Audio Preamplifier
| Input Current at ID = 0 | 100 A | |
| Max. Amplifier Bias Current (IABC) | 10 mA | |
| Max. Common Mode Input Voltage Range | 13 V | |
| Max. Differential Input Voltage | 5 V | |
| Max. Linearizing Diode Bias Current, ID | 5 mA | |
| Max. Output Short Circuit Duration | Indefinite | |
| Max. Peak Input Current with Linearizing Diode | ±ID | |
| Max. Supply Voltage (Between V+ and V-) | +36 V | |
| Max. lnput Voltage Range | V+ to V | |
| Min. Common Mode Input Voltage Range | -13 V | |
| Min. Input Resistance | 0.5 M? | |
| Min. Noise Voltage (N lABC = 500µA) | 20 nV/Hz | |
| Typ. Amplifier Bias Voltage | 1.2 V | |
| Typ. Amplifier Output Leakage Current (lABC = 0, Vo = 0V) | 0.015 nA | |
| Typ. Amplifier Output Leakage Current (lABC = 0, Vo = 30V) | 0.15 nA | |
| Typ. Amplifier Supply Current (Per Amplifier) | 2 mA | |
| Typ. Bandwidth | 9 MHz | |
| Typ. Channel Separation | 94 dB | |
| Typ. Common Mode Rejection Ratio | 100 dB | |
| Typ. Diode Network Supply Current | 600 µA | |
| Typ. Forward Transconductance (lABC = 1mA) | 16 mS | |
| Typ. Forward Transconductance (lABC = 50µA) | 0.8 mS | |
| Typ. Input Bias Current (lABC = 500µA) | 0.1 µA | |
| Typ. Input Capacitance | 4.5 pF | |
| Typ. Input Offset Current | 0.3 µA | |
| Typ. Input Offset Voltage (IABC = 100µA) | 1.8 mV | |
| Typ. Input Offset Voltage Drift (ABC = 1 µA to 1mA) | 0.5 mV | |
| Typ. Linearization Diodes Dynamic Impedance | 700 ? | |
| Typ. Linearization Diodes Offset Current (ID=10µA) | 0.5 µA | |
| Typ. Linearization Diodes Offset Current (ID=100µA) | 10 µA | |
| Typ. Open Loop Total Harmonic Distortion | 0.4% | |
| Typ. Open Loop Voltage Gain | 100 kV/V | |
| Typ. Output Capacitance | 7.5 pF | |
| Typ. Output Resistance | 63 M? | |
| Typ. Peak Output Current Sink (ABC = 5µA) | -5 µA | |
| Typ. Peak Output Current Sink (ABC = 500µA) | -410 µA | |
| Typ. Peak Output Current Sink and Source | 450 µA | |
| Typ. Peak Output Current Source (ABC = 5µA) | 5 µA | |
| Typ. Peak Output Current Source (ABC = 500µA) | 410 µA | |
| Typ. Peak Output Voltage VOM+ (lABC = 5µA) | 12.8 V | |
| Typ. Peak Output Voltage VOM+ (lABC = 500µA) | 12.6 V | |
| Typ. Peak Output Voltage VOM- (lABC = 5µA) | -13.5 V | |
| Typ. Peak Output Voltage VOM- (lABC = 500µA) | -13.5 V | |
| Typ. Power Supply Rejection Ratio | 105 dB | |
| Typ. Slew Rate, Open Loop | 125 V/µs |
| Packaging Dimensions | 0.72 in. × 0.36 in. × 0.283 in. | |
| Weight (Packaging) | 0.002 lbs. |
Attention CA Residents: Prop 65 Warning
WARNING:
This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, go to www.p65warnings.ca.gov.
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