AS1710 datasheet(11/17 Pages) AMSCO

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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

Figure 24. Rail-to-Rail Input/Output Range, 32

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

VCC = 3.0V,

RLOAD = 32

VCC = 3.0V,

RLOAD = 100k

VIN

–

AS1710

VOUT

′ = R II R

RFCF = RCIN

Inverting

VIN

–

AS1710

VOUT

Non-Inverting

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