There is no connection between the analog signal

paths and GND. V+ and GND power the internal logic

and logic-level translators, and set both the input and

output logic limits. The logic-level translators convert

the logic levels into switched V+ and GND signals to

drive the gates of the analog signals. This drive signal

is the only connection between the logic supplies (and

signals) and the analog supplies. V+ has an ESD-pro-

tection diode to GND.

Low-Voltage Operation

These devices operate from a single supply between

+2V and +12V. At room temperature, they actually

“work” with a single supply at near or below +1.7V,

although as supply voltage decreases, switch on-resis-

tance and switching times become very high.

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, which are highly layout dependent. The problem

is not turning the switch on, but turning it off. The off-

state switch acts like a capacitor, and passes higher

frequencies with less attenuation. At 10MHz, off-isola-

tion is about -50dB in 50

Ω systems, becoming worse

(approximately 20dB per decade) as frequency

increases. Higher circuit impedances also degrade off-

isolation. Adjacent channel attenuation is about 3dB

above that of a bare IC socket, and is entirely due to

capacitive coupling.

Low-Voltage, Single-Supply

Multiplexer and Switch

8

_______________________________________________________________________________________

_________________________________Test Circuits/Timing Diagrams (continued)

50%

V+

0V

0V

90%

90%

50%

V+

0V

0V

90%

90%

V+

GND

V+

ADDB

ADDA

INH

NO0

NO1–NO3

COM

V+

MAX4524

300

Ω

50

Ω

35pF

V+

GND

V+

ADD

INH

NO_

NC_

COM_

V+

MAX4525

300

Ω

35pF

50

Ω

REPEAT TEST FOR EACH SECTION.

Figure 2. Inhibit Switching Times