AS1710B-ASCT datasheet(13/20 Pages) AMSCO

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AS1710/AS1712

Datasheet - Application In form atio 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).

8.5 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

R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 comparable 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

 = 2k. To maximize stability, R << 2k is recommended.

To improve step response when R

 > 2k, 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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