_______________Detailed Description

The MAX4598 can be configured as a single 8-channel

or dual 4-channel multiplexer. In the single 8-to-1 multi-

plexer configuration, COMA connects to one of the

eight inputs (NO1 to NO8), GND, or V+ by the address

inputs A0 to A2 (see

Truth Table). In the dual 4-to-1

multiplexer configuration, COMA connects to one of the

four inputs (NO1, NO3, NO5, NO7), GND, or V+, and

COMB connects to one of the four inputs (NO2, NO4,

NO6, NO8) or GND by the address inputs A0 to A2

(see

Truth Table).

The MAX4598 functions as a standard multiplexer

when NLATCH is high. When NLATCH is low, the con-

dition set by A0 to A3 is activated at the rising edge of

LATCH. Otherwise, the outputs remain at the previously

set condition.

__________Applications Information

The MAX4598 construction is typical of most CMOS

analog switches. It has three supply pins: V+, V-, and

GND. The positive and negative power supplies are

used to drive the internal CMOS switches and set the

limits of the analog voltage on any switch. Reverse

ESD-protection diodes are internally connected be-

tween each analog signal pin and V+ and V-. If the volt-

age on any pin exceeds V+ or V- by 0.3V, one of the

ESD diodes starts to conduct. During normal operation

these reverse-biased ESD diodes leak, forming the only

current drawn from V-.

Low-Voltage, Combination Single-Ended

8-to-1/Differential 4-to-1 Multiplexer

_______________________________________________________________________________________

7

-2

2

1

0

-1

4

3

5

6

-5

-1

-2

-4

-3

0

1

2

3

4

5

V+ = +5V

V- = -5V

V+ = +5V

V- = 0

Typical Operating Characteristics (continued)

Pin Description

Positive Supply Voltage

V+

9

Multiplexer Output A

COMA

10

Data-Strobe Mode Select

NLATCH

11

Latch Input

LATCH

12

Multiplexer Enable

EN

13

Channel Input 2

NO2

5

Channel Input 3

NO3

6

Channel Input 1

NO1

7

Negative Supply Voltage

V-

8

Channel Input 4

NO4

4

Address Bit 0

A0

3

PIN

Address Bit 1

A1

2

Multiplexer Output B

COMB

1

FUNCTION

NAME

Channel Input 6

NO6

16

Channel Input 8

NO8

17

Address Bit 3

A3

18

Address Bit 2

A2

19

Ground

GND

20

Channel Input 5

NO5

14

Channel Input 7

NO7

15

0

-90

0.1

10

100

1

1000

FREQUENCY RESPONSE

-70

-80

MAX4598-09

FREQUENCY (MHz)

-50

-60

-40

-30

-10

-20

180

-180

-100

-140

-20

-60

20

60

140

100

OFF-ISOLATION

INSERTION LOSS

ON-PHASE