Figure 5. Driving a Capacitive Load through an Isolation Resistor

Figure 7. Small-Signal Gain vs. Frequency with Load

Capacitance and No Isolation Resistor

Figure 8. Small-Signal Gain vs. Frequency with Load

Capacitance and 27Ω Isolation Resistor

Figure 6. Capacitive Load vs. Isolation Resistance

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Analog Devices │ 13

MAX4012/MAX4016/

MAX4018/MAX4020

Low-Cost, High-Speed, Single-Supply

Op Amps with Rail-to-Rail Outputs

RG

RF

RISO

50Ω

CL

VOUT

VIN

RTIN

MAX40_ _

6

-4

100k

10M

100M

1M

1G

-2

FREQUENCY (Hz)

0

2

4

5

-3

-1

1

3

CL = 10pF

CL = 15pF

CL = 5pF

30

25

20

5

10

15

0

CAPACITIVE LOAD (pF)

50

0

100

200

150

250

3

-7

100k

10M

100M

1M

1G

-5

FREQUENCY (Hz)

-3

-1

1

2

-6

-4

-2

0

CL = 68pF

RISO = 27Ω

CL = 120pF

CL = 47pF