MAX4667CSE データシートの表示（PDF） - Maxim Integrated

部品番号

コンポーネント説明

メーカー

MAX4667CSE

2.5Ω, Dual, SPST, CMOS Analog Switches

Maxim Integrated 

2.5Ω, Dual, SPST,

CMOS Analog Switches

MAX4667

1, 3, 6, 8,

10, 15

2, 7

PIN

MAX4668

1, 3, 6, 8,

10, 15

2, 7

MAX4669

1, 3, 6, 8,

10, 15

2, 7

4

4

4

5

12

13

14, 11

16, 9

—

—

—

5

12

13

14, 11

—

16, 9

—

—

5

12

13

14, 11

—

—

9

16

NAME

N.C.

IN2, IN2

V-

GND

VL

V+

COM1, COM2

NC1, NC2

NO1, NO2

NC1

NO1

Pin Description

FUNCTION

No Connection. Not internally connected. Connect to GND as

low impedance to improve on/off-isolation.

Logic-Control Digital Inputs

Negative Analog Supply Voltage Input. Connect to GND for

single-supply operation.

Ground

Logic Supply Input

Positive Analog Supply Voltage Input

Analog Switch, Common Terminals

Analog Switch, Normally Closed Terminals

Analog Switch, Normally Open Terminals

Analog Switch, Normally Closed Terminal

Analog Switch, Normally Open Terminal

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 supply pins (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 leak-

age characteristics. Device operation is unchanged,

and the difference between V+ and V- should not

exceed 44V. These protection diodes are not recom-

mended when using a single supply.

Off-Isolation at High Frequencies

With the N.C. pins connected to GND, the high-fre-

quency on-response of these parts extends from DC to

above 100MHz with a typical loss of -2dB. When the

switch is turned off, however, it behaves like a capaci-

tor, and off-isolation decreases with increasing frequen-

cy. (Above 300MHz, the switch actually passes more

signal turned off than turned on.) This effect is more

pronounced with higher source and load impedances.

Above 5MHz, circuit-board layout becomes critical and

it becomes difficult to characterize the response of the

switch independent of the circuit. The graphs shown in

the Typical Operating Characteristics were taken using

a 50Ω source and load connected with BNC connectors

to a circuit board deemed “average”; that is, designed

with isolation in mind, but not using stripline or other

special RF circuit techniques. For critical applications

above 5MHz, use the MAX440, MAX441, and MAX442,

which are fully characterized up to 160MHz.

COM_

+15V

D1

V+

*

*

*

*

MAX4667

MAX4668

MAX4669

NO_/NC_

V-

D2

-15V * INTERNAL PROTECTION DIODES

Figure 1. Overvoltage Protection Using External Blocking

Diodes

8 _______________________________________________________________________________________

Share Link: