MAX4100 查看數據表（PDF） - Maxim Integrated

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MAX4100

500MHz, Low-Power Op Amps

Maxim Integrated 

500MHz, Low-Power Op Amps

Carbon composition resistors with leads are manufac-

tured by pouring the resistor material into a mold. This

process yields a relatively low-inductance resistor that

is very useful in high-frequency applications, although

they tend to cost more and have more thermal noise

than other types. The ability of carbon composition

resistors to self-heal after a large current overload

makes them useful in high-power RF applications.

For general-purpose use, surface-mount metal-film

resistors seem to have the best overall performance for

low cost, low inductance, and low noise.

Driving Capacitive Loads

When driving 50Ω or 75Ω back-terminated transmission

lines, capacitive loading is not an issue; therefore an iso-

lation resistor is not required. For other applications

where the ability to drive capacitive loads is required, the

MAX4100/MAX4101 can typically drive 5pF and 20pF,

respectively. Figure 4a illustrates how a capacitive load

influences the amplifier’s peaking without an isolation

resistor (RS). Figure 4b shows how an isolation resistor

decreases the amplifier’s peaking.

The MAX4100/MAX4101 can drive capacitive loads up to

5pF. By using a small isolation resistor between the

amplifier output and the load, large capacitance values

may be driven without oscillation (Figure 5a). In most

cases, less than 50Ω is sufficient. Use Figure 5b to deter-

mine the value needed in your application. Determine the

worst-case maximum capacitive load you may encounter

and select the appropriate resistor from the graph.

24Ω

MAX4100

VIN

RS

CL

RL

Figure 5a. Using an Isolation Resistor for High Capacitive

Loads (MAX4100)

25

20

MAX4100

15

10

MAX4101

5

0

0

20 40 60 80 100 120

CAPACITIVE LOAD (pF)

Figure 5b. Isolation vs. Capacitive Load

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