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Zakładka z wyszukiwarką danych komponentów |
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TC913BCPA Arkusz danych(PDF) 5 Page - Microchip Technology |
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TC913BCPA Arkusz danych(HTML) 5 Page - Microchip Technology |
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5 / 12 page  © 2002 Microchip Technology Inc. DS21482B-page 5 TC913A/TC913B 3.0 DETAILED DESCRIPTION 3.1 Theory of Operation Each of the TC913's two Op Amps actually consists of two amplifiers. A main amplifier is always connected from the input to the output. A separate nulling amplifier alternately nulls its own offset and then the offset of the amplifier. Since each amplifier is continuously being nulled, offset voltage drift with time, temperature and power supply variations is greatly reduced. All nulling circuitry is internal and the nulling operation is transparent to the user. Offset nulling voltages are stored on two internal capacitors. An internal oscillator and control logic, shared by the TC913's two amplifiers, control the nulling process. 3.2 Pin Compatibility The TC913 pinout is compatible with OP-14, LM358, MC1458, LT1013, TLC322, and similar dual Op Amps. In many circuits operating from single or ±5V supplies, the TC913 is a drop-in replacement offering DC performance rivaling that of the best single Op Amps. The TC913's amplifiers include a low-impedance class AB output buffer. Some previous CMOS chopper amplifiers used a high impedance output stage which made open-loop gain dependent on load resistance. The TC913's open-loop gain is not dependent on load resistance. 3.3 Overload Recovery The TC913 recovers quickly from output saturation. Typical recovery time from positive output saturation is 20 msec. Negative output saturation recovery time is typically 5 msec. 3.4 Avoiding Latchup Junction-isolated CMOS circuits inherently contain a parasitic p-n-p-n transistor circuit. Voltages exceeding the supplies by 0.3V should not be applied to the device pins. Larger voltages can turn the p-n-p-n device on, causing excessive device power supply current and power dissipation. The TC913's power supplies should be established at the same time or before input signals are applied. If this is not possible, input current should be limited to 0.1mA to avoid triggering the p-n-p-n structure. |
Podobny numer części - TC913BCPA |
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Podobny opis - TC913BCPA |
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