a
FEATURES
44 V Supply Maximum Ratings
V
SS
to V
DD
Analog Signal Range
Low On Resistance (< 70
Ω)
Low
∆R
ON
(9
Ω
max)
Low R
ON
Match (3
Ω
max)
Low Power Dissipation
Fast Switching Times
t
ON
< 110 ns
t
OFF
< 60 ns
Low Leakage Currents ( 3 nA max)
Low Charge Injection (6 pC max)
Break-Before-Make Switching Action
Latch-Up Proof
Plug-In Upgrade for
DG201A/ADG201A, DG202A/ADG202A,
DG211/ADG211A
Plug in Replacement for DG441/DG442/DG444
APPLICATIONS
Audio and Video Switching
Automatic Test Equipment
Precision Data Acquisition
Battery Powered Systems
Sample Hold Systems
Communication Systems
GENERAL DESCRIPTION
IN1
LC
2
MOS Quad SPST Switches
ADG441/ADG442/ADG444
FUNCTIONAL BLOCK DIAGRAMS
S1
IN1
D1
S2
IN2
IN2
D1
S2
S1
ADG441
ADG444
IN3
D2
S3
IN3
D3
S4
ADG442
D2
S3
D3
S4
IN4
IN4
D4
D4
SWITCHES SHOWN FOR A LOGIC "1" INPUT
Each switch conducts equally well in both directions when ON
and has an input signal range that extends to the power sup-
plies. In the OFF condition, signal levels up to the supplies are
blocked. All switches exhibit break-before-make switching action
for use in multiplexer applications. Inherent in the design is low
charge injection for minimum transients when switching the
digital inputs.
PRODUCT HIGHLIGHTS
The ADG441, ADG442 and ADG444 are monolithic CMOS
devices comprising four independently selectable switches. They
are designed on an enhanced LC
2
MOS process that provides
low power dissipation yet gives high switching speed and low on
resistance.
The on resistance profile is very flat over the full analog input
range ensuring good linearity and low distortion when switching
audio signals. High switching speed also makes the parts suit-
able for video signal switching. CMOS construction ensures
ultralow power dissipation making the parts ideally suited for
portable and battery powered instruments.
The ADG441, ADG442 and ADG444 contain four indepen-
dent SPST switches. Each switch of the ADG441 and ADG444
turns on when a logic low is applied to the appropriate control
input. The ADG442 switches are turned on with a logic high on
the appropriate control input. The ADG441 and ADG444
switches differ in that the ADG444 requires a 5 V logic power
supply which is applied to the V
L
pin. The ADG441 and
ADG442 do not have a V
L
pin, the logic power supply being
generated internally by an on-chip voltage generator.
1. Extended Signal Range
The ADG441/ADG442/ADG444 are fabricated on an en-
hanced LC
2
MOS, trench-isolated process, giving an in-
creased signal range that extends to the supply rails.
2. Low Power Dissipation
3. Low R
ON
4. Trench Isolation Guards Against Latch Up
A dielectric trench separates the P and N channel transistors
thereby preventing latch up even under severe overvoltage
conditions.
5. Break-Before-Make Switching
This prevents channel shorting when the switches are config-
ured as a multiplexer.
6. Single Supply Operation
For applications where the analog signal is unipolar, the
ADG441/ADG442/ADG444 can be operated from a single
rail power supply. The parts are fully specified with a single
+12 V power supply.
REV. 0
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood. MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703
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