Quad, Rail-to-Rail, Fault-Protected,

SPST Analog Switches

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11

Bipolar Supplies

The MAX4511/MAX4512/MAX4513 operate with bipolar

supplies between ±4.5V and ±18V. The V+ and V- sup-

plies need not be symmetrical, but their difference can

not exceed the absolute maximum rating of 44V.

Single Supply

The MAX4511/MAX4512/MAX4513 operate from a sin-

gle supply between +9V and +36V when V- is connect-

ed to GND.

High-Frequency Performance

In 50

Ω systems, signal response is reasonably flat up to

50MHz (see

Typical Operating Characteristics). Above

20MHz, the on-response has several minor peaks that

are highly layout dependent. The problem with high-fre-

quency operation is not turning the switch on, but turn-

ing it off. The off-state switch acts like a capacitor and

passes higher frequencies with less attenuation. At

10MHz, off isolation is about -42dB in 50

Ω systems,

becoming worse (approximately 20dB per decade) as

frequency increases. Higher circuit impedances also

make off isolation worse. Adjacent channel attenuation

is about 3dB above that of a bare IC socket and is due

entirely to capacitive coupling.

50%

V+

0V

+10V

0V

90%

90%

V+

GND

V+

IN_

NO_ OR NC_

COM_

+10V

MAX4511

MAX4512

MAX4513

2k

50

Ω

10pF

V-

V-

V- IS CONNECTED TO GND (0V) FOR SINGLE-SUPPLY OPERATION.

Figure 2. Switch Turn-On/Turn-Off Times

Test Circuits/Timing Diagrams

50%

V+

0V

0V

80%

V+

GND

V-

V-

2k

V+

IN_

IN_

NO_

NC_

COM_

COM_

+10V

MAX4513

50

Ω

10pF

V- IS CONNECTED TO GND (0V) FOR SINGLE-SUPPLY OPERATION.

Figure 3. MAX4513 Break-Before-Make Interval