MAX4598CWP Datasheet MAX4598CPP, MAX4598CWP, MAX4598EAP+T | P7-P9

_______________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-.

MAX4598

Low-Voltage, Combination Single-Ended

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

_______________________________________________________________________________________ 7

-2

-1

-5 -1-2-4 -3 0 1 2 3 4 5

CHARGE INJECTION vs. V

COM

MAX4598-10

COM

(V)

Q (pC)

V+ = +5V

V- = -5V

V+ = +5V

V- = 0

Typical Operating Characteristics (continued)

= +25°C, unless otherwise noted.)

Pin Description

Positive Supply VoltageV+9

Multiplexer Output ACOMA10

Data-Strobe Mode SelectNLATCH11

Latch InputLATCH12

Multiplexer EnableEN13

Channel Input 2NO25

Channel Input 3NO36

Channel Input 1NO17

Negative Supply VoltageV-8

Channel Input 4NO44

Address Bit 0A03

Address Bit 1A12

Multiplexer Output BCOMB1

FUNCTIONNAME

Channel Input 6NO616

Channel Input 8NO817

Address Bit 3A318

Address Bit 2A219

GroundGND20

Channel Input 5NO514

Channel Input 7NO715

-90

0.1 10 1001 1000

FREQUENCY RESPONSE

-70

-80

MAX4598-09

FREQUENCY (MHz)

LOSS (dB)

-50

-60

-40

-30

-10

-20

180

-180

-100

-140

PHASE (°C)

-20

-60

140

100

OFF-ISOLATION

INSERTION LOSS

ON-PHASE

MAX4598

Low-Voltage, Combination Single-Ended

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

8 _______________________________________________________________________________________

Truth Table

NO7x0

NO8x0

NO1x1

NO3x1

NO5x1

NO3x0

NO4x0

NO5x0

NO6x0

NO2x0

NO1x0

State is latched on the

rising edge of LATCH

High-Zxx

COMALATCH

V+x1

NO8x1

High-Zx1

NO7x1

GNDx1

NLATCH

GND

NO2

NO4

NO6

GND

State is latched on the

rising edge of LATCH

High-Z

COMB

GND

NO8

High-Z

NO8

GND

x = Don’t care

Virtually all the analog leakage current is through the

ESD diodes. Although the ESD diodes on a given sig-

nal pin are identical, and therefore fairly well balanced,

they are reverse-biased differently. Each is biased by

either V+ or V- and the analog signal. This means their

leakage varies as the signal varies. The difference in

the two diodes’ leakage from the signal path to the V+

and V- pins constitutes the analog signal-path leakage

current. All analog leakage current flows to the supply

terminals, not to the other switch terminal. This explains

how both sides of a given switch can show leakage

currents of either the same or opposite polarity.

There is no connection between the analog signal

paths and GND. The analog signal paths consist of an

N-channel and a P-channel MOSFET, with their sources

and drains paralleled and their gates driven out of

phase with V+ and V- by the logic-level translators.

V+ and GND power the internal logic and logic-level

translators, and set the input logic thresholds. The

logic-level translators convert the logic levels to

switched V+ and V- signals to drive the analog switch

gates. This drive signal is the only connection between

the logic supplies and the analog supplies. All pins

have ESD protection to V+ and to V-.

Increasing V- has no effect on the logic-level thresh-

olds, but it does increase the drive to the P-channel

switches, reducing their on-resistance. V- also sets the

negative limit of the analog signal voltage.

The logic-level thresholds are CMOS- and TTL-compat-

ible when V+ is +5V. As V+ is raised, the threshold

increases slightly; when V+ reaches +12V, the level

threshold is about 3.2V, which is above the TTL output

high-level minimum of 2.4V but still compatible with

CMOS outputs.

Bipolar-Supply Operation

The MAX4598 operates with bipolar supplies between

±2.7V and ±6V. The V+ and V- supplies need not be

symmetrical, but their sum cannot exceed the absolute

maximum rating of 13V. Do not connect the MAX4598

V+ pin to +3V and connect the logic-level input pins

to TTL logic-level signals. TTL logic-level outputs

can exceed the absolute maximum ratings, causing

damage to the part and/or external circuits.

Caution: The absolute maximum V+ to V- differential

voltage is 13V. Typical “±6 Volt” or “12 Volt” sup-

plies with ±10% tolerances can be as high as 13.2V

from V+ to V-. This voltage can damage the

MAX4598. Even ±5% tolerance supplies may have

overshoot or noise spikes that exceed 13V.

Single-Supply Operation

The MAX4598 operates from a single supply between

+2.7V and +12V when V- is connected to GND. All of

the bipolar precautions must be observed. However,

these parts are optimized for ±5V operation, and most

AC and DC characteristics are degraded significantly

when departing from ±5V. As the overall supply voltage

(V+ to V-) is lowered, switching speed, on-resistance,

off-isolation, and distortion are degraded (see

Typical

Operating Characteristics

Single-supply operation also limits signal levels and

interferes with grounded signals. When V- = 0, AC sig-

nals are limited to -0.3V. Voltages below -0.3V can be

clipped by the internal ESD-protection diodes, and the

parts can be damaged if excessive current flows.

Power Off

When power to the MAX4598 is off (i.e., V+ = V- = 0),

the Absolute Maximum Ratings still apply: neither logic-

level inputs on NO_ nor signals on COM_ can exceed

±0.3V. Voltages beyond ±0.3V cause the internal ESD-

protection diodes to conduct, and the parts can be

damaged if excessive current flows.

MAX4598

Low-Voltage, Combination Single-Ended

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

_______________________________________________________________________________________ 9

Test Circuits/Timing Diagrams

50%

< 20ns

OUT

V+

NO1

NO8

LOGIC

INPUT

SWITCH

OUTPUT

V+

+5V

OUT

-5V

GND

V+

V-

NLATCH

NO1

NO2–NO7

NO8

COMA

+3V

50Ω

MAX4598

300Ω

35pF

90%

TRANS

-3V

LATCH

Figure 1. Transition Time

50% 50%

OPEN

< 20ns

OUT

V+

LOGIC

INPUT

SWITCH

OUTPUT

COM

+5V

OUT

-5V

GND

V+NLATCH

V-

NO1–NO8

COMA

+3V

50Ω

MAX4598

300Ω

35pF

90%

LATCH

Figure 2. Break-Before-Make Interval

P1-P3 P4-P6 P7-P9 P10-P12

MAX4598CWP

Mfr. #:

Buy MAX4598CWP

Manufacturer:

Maxim Integrated

Description:

Multiplexer Switch ICs Low-Voltage, Combination Single-Ended 8-to-1 and Differential 4-to-1 Multiplexer

Lifecycle:

New from this manufacturer.

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MAX4598CWP

MAX4598CWP

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