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 5Ω 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.

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

Current Feedback Amplifiers

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.

© 2007 Maxim Integrated Products

is a registered trademark of Maxim Integrated Products, Inc.

TRANSISTOR COUNT: 53

(MAX4112/MAX4113)

112 (MAX4117/MAX4118)

220 (MAX4119/MAX4120)

VIDEO

IN

VIDEO

OUT

75Ω

75Ω CABLE

75Ω CABLE

75Ω

75Ω

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)

___________________Chip Information

*Contact factory for QSOP package availability.

PART

TEMP RANGE

PIN-

PACKAGE

PKG

CODE

MAX4119ESD

-40°C to +85°C

14 SO

S14-1

MAX4119EEE

-40°C to +85°C

16 QSOP

E16-1

MAX4120ESD

-40°C to +85°C

14 SO

S14-1

MAX4120EEE

-40°C to +85°C

16 QSOP

E16-1

Revision History

Pages changed at Rev 3: 1–3, 6, 7, 10–12