AD8231

Rev. A | Page 12 of 24

100

10

1

0.1

0.01

11

10k

1k

100

10

FREQUENCY (Hz)

00k

G = +1, 1µV/DIV

G = +128, 0.4µV/DIV

1s/DIV

Figure 21. Instrumentation Amplifier 0.1 Hz to 10 Hz Noise

Figure 24. Instrumentation Amplifier Current Noise Spectral Density

100

80

60

40

20

90

70

50

30

10

0

1

10

100

1k

FREQUENCY (Hz)

G = +1

G = +8

G = +128

5µs/DIV

20mV/DIV

Figure 25. Instrumentation Amplifier Small Signal Pulse Response, G = 1,

R

Figure 22. Instrumentation Amplifier Voltage Noise Spectral Density vs.

Frequency, 5 V, 1 Hz to 1000 Hz

= 2 kΩ, C = 500 pF

L

L

1000

900

800

700

600

500

400

300

200

100

0

1

10

100

1k

10k

100k

FREQUENCY (Hz)

G = +1

G = +8

G = +128

NO

LOAD

300pF

500pF

800pF

4µs/DIV

20mV/DIV

Figure 26. Instrumentation Amplifier Small Signal Pulse Response for Various

Capacitive Loads, G = 1

Figure 23. Instrumentation Amplifier Voltage Noise Spectral Density vs.

Frequency, 5 V, 1 Hz to 1 MHz