a us t ria
m i c r o
s y s t e m s
AS1741, AS1742, AS1743
H i g h - Sp e e d , L o w - Vo l ta g e , S i n g l e - S u p p l y, 0 . 8Ω,
Dual SPST Analog Switches
D a ta S he e t
1 General Description
The AS1741/AS1742/AS1743 are high-speed, low-volt-
age, dual single-pole/single-throw (SPST) analog
switches.
Fast switching speeds, low ON-resistance, and low
power-consumption make these devices ideal for single-
cell battery powered applications.
These highly-reliable devices operate from a single +1.6
to +3.6V supply, and are differentiated by the type and
number of switches as listed in
Table 1. Standard Products
Model
AS1741
AS1742
AS1743
Switch Types
Two Normally Open (NO) Switches
Two Normally Closed (NC) Switches
One NO Switch and One NC Switch
2 Key Features
!
ON-Resistance:
- 0.8Ω (+3V supply)
- 2.5Ω (+1.8V supply)
!
!
!
!
!
!
!
!
!
!
!
R
ON
Matching: 0.08Ω (+3V supply)
R
ON
Flatness: 0.18Ω (+3V supply)
Supply Voltage Range: +1.6 to +3.6V
Switching Action: t
ON
= 22ns, t
OFF
= 14ns
Current-Handling: 250mA Continuous
Break-Before-Make Switching (AS1743)
Rail-to-Rail Signal Handling
1.8V CMOS Logic Compatible (+3V supply)
Total Harmonic Distortion: 0.03%
Operating Temperature Range: -40 to +85ºC
Package Types:
- 8-pin MSOP
- 8-pin SOT23
The AS1743 supports break-before-make switching.
With very low ON-resistance (R
ON
), R
ON
matching, and
R
ON
flatness, the devices can accurately switch signals
for sample and hold circuits, digital filters, and op-amp
gain switching networks.
The AS1741/AS1742/AS1743 digital logic input is 1.8V
CMOS-compatible when using a single +3V supply, and
all devices can handle Rail-to-Rail signals.
The devices are available in an 8-pin MSOP package
and an 8-pin SOT23 package.
3 Applications
The devices are ideal for use in power routing systems,
cordless and mobile phones, MP3 players, CD and DVD
players, PDAs, handheld computers, digital cameras,
hard drives, and any other application where high-speed
signal switching is required.
Figure 1. MSOP Block Diagrams
AS1741
NO1
V+
NC1
AS1742
V+
NO1
AS1743
V+
COM1
IN1
COM1
IN1
COM1
IN1
IN2
COM2
IN2
COM2
IN2
COM2
GND
NO2
GND
NC2
GND
NC2
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