Improved, Dual, High-Speed Analog Switches

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5

__________Applications Information

_____________________Pin Description

Figure 1. Overvoltage Protection Using External Blocking Diodes

Operation with Supply Voltages

Other than ±15V

The DG401/DG403/DG405 switches operate with

±4.5V to ±20V bipolar supplies or with a +10V to +30V

single supply. In either case, analog signals ranging

from V+ to V- can be switched. The Typical Operating

Characteristics graphs illustrate typical analog-signal

and supply-voltage on-resistance variations. The usual

on-resistance temperature coefficient is 0.5%/°C (typ).

Logic Inputs

These devices operate with a single positive supply or

with bipolar supplies. They maintain TTL compatibility

with supplies anywhere in the ±4.5V to ±20V range as

supply at voltages other than +5V, the devices will

operate at CMOS-logic-level inputs.

Overvoltage Protection

Proper power-supply sequencing is recommended for

all CMOS devices. Do not exceed the absolute

maximum ratings because stresses beyond the listed

ratings may cause permanent damage to the devices.

logic inputs. If power-supply sequencing is not

possible, add two small, external signal diodes in

series with supply pins for overvoltage protection

(Figure 1). Adding diodes reduces the analog-signal

range to 1V below V+ and 1V below V-, without affect-

ing low switch resistance and low leakage

characteristics. Device operation is unchanged, and

the difference between V+ and V- should not exceed

+44V.

DG401

DIP/SO

LCC

NAME

FUNCTION

1, 8

2, 10

D1, D2

Drain (Analog Signal)

2-7

1, 3-9,

11, 16

N.C.

Not internally connected

9, 16

12, 20

S2, S1

Source (Analog Signal)

10, 15

13, 19

IN2, IN1 Digital Logic Inputs

11

14

V+

Positive Supply-Voltage

Input—connected to

substrate

12

15

Logic Supply-Voltage Input

13

17

GND

Ground

14

18

V-

Negative Supply-Voltage

Input

DG403

DIP/SO

LCC

NAME

FUNCTION

1, 8, 3, 6

2, 10, 4, 8

D1-D4

Drain (Analog Signal)

2, 7

1, 3, 6, 9,

11, 16

N.C.

Not internally connected

11

14

V+

Positive Supply-Voltage

Input—connected to

substrate

12

15

Logic Supply-Voltage Input

13

17

GND

Ground

14

18

V-

Negative Supply-Voltage

Input

DG405

DIP/SO

LCC

NAME

FUNCTION

1, 8, 3, 6

2, 10, 4, 8

D1-D4

Drain (Analog Signal)

2, 7

1, 3, 6, 9,

11, 16

N.C.

Not internally connected

11

14

V+

Positive Supply-Voltage

Input—connected to

substrate

12

15

Logic Supply-Voltage Input

13

17

GND

Ground

14

18

V-

Negative Supply Voltage

V+

D

V-

S

16, 9, 4, 5

20, 12,

5, 7,

S1-S4

Source (Analog Signal)

10, 15

13, 19

IN2, IN1 Digital Logic Inputs

16, 9, 4, 5

20, 12,

5, 7,

S1-S4

Source (Analog Signal)

10, 15

13, 19

IN2, IN1 Digital Logic Inputs