AD8510/AD8512/AD8513

Rev. E | Page 14 of 20

SETTLING TIME

Settling time is the time it takes the output of the amplifier to

reach and remain within a percentage of its final value after a

pulse has been applied at the input. The AD8510/AD8512/

AD8513 settle to within 0.01% in less than 900 ns with a step of

0 V to 10 V in unity gain. This makes the each of the parts an

excellent choice as a buffer at the output of DACs whose settling

time is typically less than 1 µs.

In addition to their fast settling time and fast slew rate, the

AD8510/AD8512/AD8513’s low offset voltage drift and input

offset current maintain full accuracy of 12-bit converters over

the entire operating temperature range.

OVERLOAD RECOVERY TIME

Overload recovery, also known as overdrive recovery, is the time

it takes the output of an amplifier to recover from a saturated

condition to its linear region. This recovery time is particularly

important in applications where the amplifier must amplify

small signals in the presence of large transient voltages.

Figure 43 shows the positive overload recovery of the

AD8510/AD8512/AD8513. The output recovers in

approximately 200 ns from a saturated condition.

TIME (2

µs/DIV)

200mV

0V

0V

–15V

RL = 10kΩ

Figure 43. Positive Overload Recovery

The negative overdrive recovery time shown in Figure 44 is less

than 200 ns.

In addition to the fast recovery time, the AD8510/AD8512/

AD8513 show excellent symmetry of the positive and negative

recovery times. This is an important feature for transient signal

rectification, because the output signal is kept equally undis-

torted throughout any given period.

TIME (2

µs/DIV)

–200mV

0V

0V

+15V

Figure 44. Negative Overload Recovery

CAPACITIVE LOAD DRIVE

The AD8510/AD8512/AD8513 are unconditionally stable at all

gains in inverting and noninverting configurations. They are

capable of driving up to 1000 pF of capacitive loads without

oscillation in unity gain, the worst-case configuration.

However, as with most amplifiers, driving larger capacitive loads

in a unity gain configuration may cause excessive overshoot and

ringing or even oscillation. A simple snubber network reduces

the amount of overshoot and ringing significantly. The advan-

tage of this configuration is that the output swing of the ampli-

7

4

6

AD8510

200mV

V+

V–

Figure 45. Snubber Network Configuration

Figure 46 shows a scope photograph of the output of the

AD8510/AD8512/AD8513 in response to a 400 mV pulse. The

circuit is configured in positive unity gain (worst-case) with a

load experience of 500 pF.