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AD8610/AD8620

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/AD8620

outperform the OPA627 for distortion, especially at frequencies

above 20 kHz.

0.1

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 X,

10 MΩ, 11.2 pF scope probe.

100

10k

80k

0.01

0.001

0.0001

OPA627

AD8610

VS = ±13V

VIN = 5V rms

BW = 80kHz

0.001

0.01

0.1

1.2k

1.0k

800

600

400

200

FREQUENCY (Hz)

ERROR BAND (%)

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

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

0.1

FREQUENCY (Hz)

OPA627

0.001

0.01

0.1

ERROR BAND (%)

1.2k

1.0k

800

600

400

200

Figure 59. THD + Noise vs. Frequency

Figure 61. OPA627 Settling Time vs. Error Band

Noise vs. Common-Mode Voltage

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

range as shown in Table 5.

Table 5. Noise vs. Common-Mode Voltage

100

10k

20k

0.01

0.001

4V rms

6V rms

2V rms

VS = ±13V

RL = 600Ω

VCM at F = 1 kHz (V)

Noise Reading (nV/√Hz)

−10

7.21

−5

6.89

6.73

6.41

+10

7.21

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