Driving Capacitive Loads

The MAX4112/MAX4113/MAX4117–MAX4120 are opti-

mized for AC performance. They are not designed to

drive highly capacitive loads. Reactive loads decrease

phase margin and can produce excessive ringing and

oscillation. Figure 5a shows a circuit that eliminates this

problem. The small (usually 5

Ω to 22Ω) isolation resis-

ing and oscillation. At higher capacitive loads, AC

performance is controlled by the interaction of the load

capacitance and isolation resistor.

Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are

implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.

© 1997 Maxim Integrated Products

Printed USA

is a registered trademark of Maxim Integrated Products.

Single/Dual/Quad, 400MHz, Low-Power,

Current Feedback Amplifiers

TRANSISTOR COUNT: 53

(MAX4112/MAX4113)

112 (MAX4117/MAX4118)

220 (MAX4119/MAX4120)

VIDEO

IN

VIDEO

OUT

75

Ω

75

Ω CABLE

75

Ω CABLE

75

Ω

75

Ω

MAX4112

MAX4113

MAX4117

MAX4118

MAX4119

MAX4120

Figure 4. Video Line Driver

MAX4112

MAX4113

MAX4117

MAX4118

MAX4119

MAX4120

Loads

0.1

10

1

100

1000

FREQUENCY (MHz)

12

10

8

6

4

2

0

Figure 5b. Frequency Response vs. Capacitive Load—

No Isolation Resistor

0.1

12

10

8

6

4

2

0

-2

10

1

100

1000

FREQUENCY (MHz)

Figure 5c. Frequency Response vs. Isolation Resistance

(see Figure 5a for circuit)

_Ordering Information (continued)

PART

MAX4119ESD

MAX4119EEE

-40°C to +85°C

-40°C to +85°C

TEMP. RANGE

PIN-PACKAGE

14 SO

16 QSOP*

MAX4120ESD

-40°C to +85°C

14 SO

MAX4120EEE

-40°C to +85°C

16 QSOP*

___________________Chip Information

*

Contact factory for QSOP package availability.