MAX4518ESD Просмотр технического описания (PDF) - Maxim Integrated

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MAX4518ESD

Precision, 4-Channel/Dual 2-Channel, Low-Voltage, CMOS Analog Multiplexers

Maxim Integrated 

Precision, 4-Channel/Dual 2-Channel,

Low-Voltage, CMOS Analog Multiplexers

__________Applications Information

Operation with Supply Voltages

Other than ±5V

Using supply voltages less than ±5V reduces the analog

signal range. The MAX4518/MAX4519 muxes operate

with ±2.7V to ±8V bipolar supplies or with a +2.7V to

+15V single supply. Connect V- to GND when operating

with a single supply. Both device types can also operate

with unbalanced supplies, such as +10V and -5V. The

Typical Operating Characteristics graphs show typical

on-resistance with ±3V, ±5V, +3V and +5V supplies.

(Switching times increase by a factor of two or more for

operation at 5V.)

Overvoltage Protection

Proper power-supply sequencing is recommended for

all CMOS devices. Do not exceed the absolute maxi-

mum ratings, because stresses beyond the listed rat-

ings can cause permanent damage to the devices.

Always sequence V+ on first, then V-, followed by the

logic inputs, NO, or COM. If power-supply sequencing

is not possible, add two small signal diodes (D1, D2) in

series with supply pins for overvoltage protection

(Figure 1). Adding diodes reduces the analog signal

range to one diode drop below V+ and one diode drop

+5V

D1

V+

MAX4518

MAX4519

*

*

COM

NO

*

*

V-

D2

-5V * INTERNAL PROTECTION DIODES

Figure 1. Overvoltage Protection Using External Blocking Diodes

above V-, but does not affect the devices’ low switch

resistance and low leakage characteristics. Device

operation is unchanged, and the difference between

V+ and V- should not exceed 17V. These protection

diodes are not recommended when using a single supply.

______________________________________________Test Circuits/Timing Diagrams

+5V

V+

EN

V+

NO1

+5V

NO2–NO3

A0 MAX4518 NO4

-5V

A1

COM

GND

50Ω

V-

300Ω

+5V -5V

V+

EN

V+

NO1B

+5V

COMA, NO1A–NO2A

A0

A1 MAX4519 NO2B

-5V

COMB

GND

V-

50Ω

300Ω

-5V

VOUT

35pF

VOUT

35pF

LOGIC +3V

INPUT

VEN

0V

VNO1A, VNO1B

SWITCH

OUTPUT

VOUT 0V

VNO4, VNO2B

tR < 20ns

50%

tF < 20ns

90%

90%

tTRANS

tTRANS

Figure 2. Transition Time

8 _______________________________________________________________________________________

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