LC2MOS Quad SPST Switches
ADG441/ADG442/ADG444
FUNCTIONAL BLOCK DIAGRAM
FEATURES
S1
S1
44 V supply maximum ratings
VSS to VDD analog signal range
Low on resistance (<70 Ω)
Low ∆RON (9 Ω max)
Low RON match (3 Ω max)
Low power dissipation
Fast switching times
IN1
IN2
IN3
IN4
IN1
IN2
IN3
IN4
D1
S2
D1
S2
ADG441
ADG444
D2
S3
D2
S3
ADG442
D3
S4
D3
S4
tON < 110 ns
tOFF < 60 ns
D4
D4
Low leakage currents (3 nA max)
Low charge injection (6 pC max)
Break-before-make switching action
Latch-up proof A grade
Plug-in upgrade for DG201A/ADG201A, DG202A/ADG202A,
DG211/ADG211A
Plug-in replacement for DG441/DG442/DG444
SWITCHES SHOWN FOR A LOGIC 1 INPUT
Figure 1.
differ in that the ADG444 requires a 5 V logic power supply
that is applied to the VL pin. The ADG441 and ADG442 do not
have a VL pin, the logic power supply is generated internally by
an on-chip voltage generator.
Each switch conducts equally well in both directions when ON
and has an input signal range that extends to the power
supplies. 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 the low charge injection for minimum transients when
switching the digital inputs.
APPLICATIONS
Audio and video switching
Automatic test equipment
Precision data acquisition
Battery-powered systems
Sample-and-hold systems
Communication systems
PRODUCT HIGHLIGHTS
GENERAL DESCRIPTION
1. Extended signal range. The ADG441A/ADG442A/
ADG444A are fabricated on an enhanced LC2MOS, trench-
isolated process, giving an increased signal range that
extends to the supply rails.
The ADG441, ADG442, and ADG444 are monolithic CMOS
devices that comprise of four independently selectable switches.
They are designed on an enhanced LC2MOS process that
provides low power dissipation yet gives high switching speed
and low on resistance.
2. Low power dissipation.
3. Low RON
.
The on resistance profile is very flat over the full analog input
range, which ensures good linearity and low distortion when
switching audio signals. High switching speed also makes the
parts suitable 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 independent
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 logic high on the
appropriate control input. The ADG441 and ADG444 switches
4. Trench isolation guards against latch-up for A grade parts. 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 configured 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. A
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 that may result from its use.
Specifications subject to change without notice. No license is granted by implication
or otherwise under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
www.analog.com
©2005 Analog Devices, Inc. All rights reserved.
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