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AS1712A Datasheet(PDF) 11 Page - ams AG |
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AS1712A Datasheet(HTML) 11 Page - ams AG |
11 / 17 page www.austriamicrosystems.com Revision 1.06 11 - 17 AS1710/AS1712 Data Sheet - A p p l i c a t i o n I n f o r m a t i o n Figure 23. Rail-to-Rail Input/Output Range, 100k Ω Figure 24. Rail-to-Rail Input/Output Range, 32 Ω Note: The absolute maximum ratings (see page 3) for power dissipation and output short-circuit duration (10s, max) must be adhered to since the output current can exceed 200mA (see Typical Operating Characteristics on page 6). Input Capacitance The parallel-connected differential input stages for rail-to-rail operation results in relatively large input capacitance CIN (6pF typ). This introduces a pole at frequency (2 πR′CIN)-1, where R′ is the parallel combination of the gain-setting resistors for the inverting or non-inverting amplifier configuration (Figure 25). If the pole frequency is less than or com- parable to the unity-gain bandwidth (10MHz), the phase margin is reduced, and the amplifier exhibits degraded AC performance through either ringing in the step response or sustained oscillations. Figure 25. Inverting and Non-inverting Amplifiers with Feedback Compensation The pole frequency is 10MHz when R ′ = 2kΩ. To maximize stability, R′ << 2kΩ is recommended. To improve step response when R ′ > 2kΩ, connect a small capacitor (CF) between the inverting input and output. CF can be calculated by: CF = 6(R/RF) [pf] (EQ 6) Where: RF is the feedback resistor. R is the gain-setting resistor. 2.5µs/Div 2.5µs/Div VCC = 3.0V, RLOAD = 32 Ω VCC = 3.0V, RLOAD = 100k Ω VIN RF – + AS1710 CF VOUT R R ′ = R II R F RFCF = RCIN Inverting VIN RF – + AS1710 CF VOUT R Non-Inverting |
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