MAX4102 查看數據表（PDF） - Maxim Integrated

零件编号

产品描述 (功能)

生产厂家

MAX4102

250MHz, Broadcast-Quality, Low-Power Video Op Amps

Maxim Integrated 

250MHz, Broadcast-Quality, Low-Power

Video Op Amps

Driving Capacitive Loads

When driving 50Ω or 75Ω back-terminated transmission

lines, capacitive loading is not an issue. The MAX4102/

MAX4103 can typically drive 5pF and 20pF, respectively.

Figure 3a illustrates how a capacitive load influences the

amplifier’s peaking without an isolation resistor (RS).

Figure 3b shows how an isolation resistor decreases the

amplifier’s peaking. By using a small isolation resistor

between the amplifier output and the load, large capaci-

tance values may be driven without oscillation (Figure

4a). In most cases, less than 50Ω is sufficient. Use Figure

4b to determine the value needed in your application.

Determine the worst-case maximum capacitive load you

may encounter and select the appropriate resistor from

the graph.

6

5

AVCL = +1

4

3

2

CL = 15pF

CL = 10pF

1

0

-1

CL = 5pF

-2

-3

-4

0.1M

1M

10M 100M

1G

FREQUENCY (Hz)

Figure 3a. MAX4102 Bandwidth vs. Capacitive Load

(No Isolation Resistor (RS))

4

3

CL = 10pF

RS = 10Ω

RS = 22Ω

2

1

0

-1

RS = 33Ω

-2

-3

-4

-5

-6

0.1M

1M

10M 100M

1G

FREQUENCY (Hz)

Figure 3b. MAX4102 Bandwidth vs. 10pF Capacitive Load and

Isolation Resistor

24Ω

RS

MAX4102

VIN

CL

RL

40

35

30

25

20

15

10

5

0

MAX4102

MAX4103

50 100 150 200 250

CAPACITIVE LOAD (pF)

Figure 4a. Using an Isolation Resistor (RS) for Large Capacitive

Loads (MAX4102)

Figure 4b. Isolation vs. Capacitive Load

10 ______________________________________________________________________________________

Share Link: