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What is AS1744?

This electronic component, produced by the manufacturer "austriamicrosystems", performs the same function as "(AS1744 / AS1745) SPDT Analog Switches".


AS1744 Datasheet PDF - austriamicrosystems

Part Number AS1744
Description (AS1744 / AS1745) SPDT Analog Switches
Manufacturers austriamicrosystems 
Logo austriamicrosystems Logo 


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austriamicrosystems
AS1744, AS1745
High-Speed, Low-Voltage, Dual, Single-Supply,
4 , S P D T A n a l o g S w i t c h e s
Data Sheet
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 (RON), RON matching, and RON
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:
- 4(+5V supply)
- 5.5(+3V supply)
! RON Matching: 0.2(+5V supply)
! RON Flatness: 1(+5V supply)
! Supply Voltage Range: +1.8 to +5.5V
! 1.8V Operation:
- 9.5ON-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
Figure 1. Block Diagrams
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.
1 10
1 10
IN1 COM1
IN1
Truth Table
29
2
NO1
NC1
INx
NOx to NCx to
COMx COMx
NC1
COM1
9
NO1
3
GND
AS1744
8
V+
Low
High
Off
On
On
Off
3 AS1745 8
GND
V+
47
4
NO2
NC2
Switches shown for low input.
NC2
7
NO2
56
56
IN2 COM2
IN2 COM2
www.austriamicrosystems.com
Revision 1.53
1 - 16

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AS1744 equivalent
AS1744, AS1745
Data Sheet
austriamicrosystems
6 Typical Operating Characteristics
Figure 2. Frequency Response
10
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
0.001
Bandwidth
Isolation
Crosstalk
0.1 10
Frequency (MHz)
1000
Figure 3. THD vs. Frequency
0.12
0.1
0.08
0.06
0.04
0.02
0
1000
10000
Frequency (Hz)
100000
Figure 4. RON vs. VCOM and Temperature (VDD = 5V)
3.5
3.0
Temp = +85ºC
2.5
Temp = +25ºC
2.0
Temp = -40ºC
1.5
1.0
0 1 23 4 5
VCOM (V)
Figure 5. RON vs. VCOM and Temperature (VDD = 3V)
4.5
4.0 Temp = +85ºC
3.5
3.0 Temp = +25ºC
2.5 Temp = -40ºC
2.0
1.5
1.0
0.0
1.0 2.0
VCOM (V)
3.0
Figure 6. RON vs. VCOM
14
12
10
8 VDD = 1.8V
6 VDD = 2.5V
VDD = 3V
4
2
VDD = 5V
0
0 12 3
VCOM (V)
VDD = 4.5V
45
Figure 7. tON/tOFF vs. Temperature (V+ = 5V)
25
20
15 tON
10
tOFF
5
0
-40 25 85
Temperature (°C)
www.austriamicrosystems.com
Revision 1.53
5 - 16


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