AD8610 datasheet(17/24 Pages) AD

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AD8610/AD8620

Rev. F | Page 17 of 24

THD Readings vs. Common-Mode Voltage

Total harmonic distortion of the AD8610/AD8620 is well below

0.0006% with any load down to 600 Ω. The AD8610 outperforms

the OPA627 for distortion, especially at frequencies above 20 kHz.

100

10k

80k

FREQUENCY (Hz)

0.1

0.01

0.001

0.0001

OPA627

AD8610

VS = ±13V

VIN = 5V rms

BW = 80kHz

Figure 58. AD8610 vs. OPA627 THD + Noise @ VCM = 0 V

100

10k

20k

FREQUENCY (Hz)

0.1

0.01

0.001

4V rms

6V rms

2V rms

VS = ±13V

RL = 600Ω

Figure 59. THD + Noise vs. Frequency

Noise vs. Common-Mode Voltage

The AD8610/AD8620 noise density varies only 10% over the

input range, as shown in Table 5.

Table 5. Noise vs. Common-Mode Voltage

VCM at f = 1 kHz (V)

Noise Reading (nV/√Hz)

−10

7.21

−5

6.89

6.73

6.41

+10

7.21

Settling Time

The AD8610/AD8620 have a very fast settling time, even to a

very tight error band, as can be seen from Figure 60. The AD8610/

AD8620 are configured in an inverting gain of +1 with 2 kΩ input

and feedback resistors. The output is monitored with a 10×,

10 MΩ, 11.2 pF scope probe.

0.001

0.01

0.1

ERROR BAND (%)

1.2k

1.0k

800

600

400

200

Figure 60. AD8610/AD8620 Settling Time vs. Error Band

OPA627

0.001

0.01

0.1

ERROR BAND (%)

1.2k

1.0k

800

600

400

200

Figure 61. OPA627 Settling Time vs. Error Band

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