REV. D

AD8610/AD8620

–13–

4V rms

6V rms

2V rms

13V

FREQUENCY – Hz

0.01

0.001

10

20k

0.1

100

1k

10k

Figure 19. THD + Noise vs. Frequency

Noise vs. Common-Mode Voltage

AD8610 noise density varies only 10% over the input range as

shown in Table I.

Table I. Noise vs. Common-Mode Voltage

Noise Reading (nV/

–10

7.21

–5

6.89

06.73

+5

6.41

+10

7.21

Settling Time

The AD8610 has a very fast settling time, even to a very tight error

band, as can be seen from Figure 20. The AD8610 is configured

in an inverting gain of +1 with 2 k

Ω input and feedback resistors.

The output is monitored with a 10

×, 10 M, 11.2 pF scope probe.

ERROR BAND – %

1.2k

0

0.001

10

0.01

0.1

1

800

400

1.0k

600

200

Figure 20. AD8610 Settling Time vs. Error Band

ERROR BAND – %

1.2k

1.0k

0

0.001

10

0.01

0.1

1

800

600

200

400

OPA627

Figure 21. OPA627 Settling Time vs. Error Band

The AD8610/AD8620 maintains this fast settling when loaded

with large capacitive loads as shown in Figure 22.

0

2000

500

1000

1500

ERROR BAND

0.01%

3.0

2.0

0.0

1.0

2.5

1.5

0.5

Figure 22. AD8610 Settling Time vs. Load Capacitance

3.0

2.0

0.0

1.0

2.5

1.5

0.5

0

2000

500

1000

1500

ERROR BAND

0.01%

Figure 23. OPA627 Settling Time vs. Load Capacitance

Output Current Capability

The AD8610 can drive very heavy loads due to its high output

current. It is capable of sourcing or sinking 45 mA at

±10 V output.

The short circuit current is quite high and the part is capable of

sinking about 95 mA and sourcing over 60 mA while operating with