MAX4700EAE 查看數據表（PDF） - Maxim Integrated

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MAX4700EAE

1.25Ω, Dual SPST, CMOS Analog Switches

Maxim Integrated 

1.25Ω, Dual SPST,

CMOS Analog Switches

___________Applications Information

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 the supply pins and a Schottky diode

between V+ and VL for overvoltage protection (Figure

1). Adding diodes reduces the analog signal range to

one diode drop below V+ and one diode drop 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 44V.

COM_

+15V

D1

MAX4680

V+

VL

MAX4690

MAX4700

*

*

NO_

*

*

V-

D2

-15V * INTERNAL PROTECTION DIODES

Figure 1. Overvoltage Protection Using External Blocking Diodes

MAX4680

MAX4690

+5V

+15V MAX4700

SWITCH

INPUT

VCOM_

VL

COM_

IN_

V+

NO_

OR NC_

SWITCH

OUTPUT

VO

RL

CL

100Ω

35pF

LOGIC

INPUT

GND

V-

0

-15V

REPEAT TEST FOR EACH SWITCH. FOR LOAD

CONDITIONS, SEE Electrical Characteristics.

CL INCLUDES FIXTURE AND STRAY CAPACITANCE.

( ) VO = VCOM

RL

RL + RON

Figure 2. Switching-Time Test Circuit

+3V

LOGIC

INPUT 0

50%

tr < 20ns

tf < 20ns

VO

SWITCH 0

OUTPUT

0.9V0

tON

tOFF

0.9V0

LOGIC INPUT WAVEFORMS INVERTED FOR SWITCHES

THAT HAVE THE OPPOSITE LOGIC SENSE.

8 _______________________________________________________________________________________

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