a us t ria
m i c r o
s y s t e m s
AS1744 , AS1745
H i g h - Sp e e d , L o w - Vo l ta g e , D u a l , S i n g l e - S u p p l y,
4
Ω,
S P D T A n a l o g S w i t c h e s
D a ta S he e t
1 General Description
The AS1744/AS1745 are high-speed, low-voltage, dual
single-pole/double-throw (SPDT) 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 +1.8 to
+5.5V supply, are differentiated by inverted logic, and
support break-before-make switching.
With 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 devices are available in a 10-pin MSOP package
and a 10-pin TDFN package.
2 Key Features
!
ON-Resistance:
- 4Ω (+5V supply)
- 5.5Ω (+3V supply)
R
ON
Matching: 0.2Ω (+5V supply)
R
ON
Flatness: 1Ω (+5V supply)
Supply Voltage Range: +1.8 to +5.5V
1.8V Operation:
- 9.5Ω ON-Resistance over Temperature
- 38ns Turn On Time
- 12ns Turn Off Time
Current-Handling: 100mA Continuous
Break-Before-Make Switching
Rail-to-Rail Signal Handling
Crosstalk: -90dB at 1MHz
Off-Isolation: -85dB at 1MHz
Total Harmonic Distortion: 0.1%
Operating Temperature Range: -40 to +85ºC
Package Types:
- 10-pin MSOP
- 10-pin TDFN
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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,
and any other application where high-speed signal
switching is required.
Figure 1. Block Diagrams
1
IN1
2
NO1
3
GND
4
NO2
5
IN2
10
COM1
9
NC1
1
10
COM1
9
NO1
Truth Table
IN1
2
NC1
3
GND
4
NC2
5
IN2
INx
Low
High
NOx to NCx to
COMx COMx
Off
On
On
Off
AS1744
8
V+
7
NC2
6
COM2
AS1745
8
V+
7
NO2
6
COM2
Switches shown for low input.
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