Applications Information

Operation with Supply Voltages

Other Than ±15V

Using supply voltages other than ±15V reduces the

analog signal range. The DG441/DG442 switches oper-

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

to +30V single supply; connect V- to 0V when operating

with a single supply. Also, all device types can operate

with unbalanced supplies such as +24V and -5V. The

Typical Operating Characteristics graphs show typical

on-resistance with ±20V, ±15V, ±10V, and ±5V sup-

plies. (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, followed by V- and 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 exter-

nal diodes reduces the analog-signal range to 1V

below V+ and 1V above V-, but low switch resistance

and low leakage characteristics are unaffected. Device

operation is unchanged, and the difference between

V+ and V- should not exceed +44V.

Pin Description

Improved, Quad, SPST Analog Switches

6

_______________________________________________________________________________________

V+

S

V-

D

Vg

Figure 1. Overvoltage Protection Using External Blocking Diodes

PIN

DIP/SO

THIN

QFN-EP

NAME

FUNCTION

1, 16, 9,

8

15, 14,

7, 6

IN1–IN4

Input

2, 15,

10, 7

16, 13,

8, 5

D1–D4

Analog Switch Drain Terminal

3, 14,

11, 6

1, 12, 9,

4

S1–S4

Analog Switch Source

Terminal

4

2

V-

Negative-Supply Voltage Input

5

3

GND

Ground

12

10

N.C.

Not Internally Connected

13

11

V+

Positive-Supply Voltage

Input—Connected to Substrate

——

EP

Exposed Pad. Connect EP to

V+. Do not use EP as a sole

V+ connection. (Thin QFN

package only.)