__________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

_______________________________________________________________________________________

PIN

NAME

FUNCTION

1, 16, 9, 8

IN1–IN4 Input

2, 15, 10, 7

D1–D4

Drain Output

3, 14, 11, 6

S1–S4

Source Output

4

V-

Negative Supply Voltage Input

5

GND

Ground

12

N.C.

Not Internally Connected

13

V+

Positive Supply Voltage Input.

Connected to substrate.

V+

S

V-

D

Vg

Figure 1. Overvoltage Protection Using External Blocking Diodes