AMSCO AS1747

Da t as heet
AS1747
L o w - Vo l ta g e , D u a l S P D T, A u d i o C l i c k l e s s S w i t c h
w i t h N e g a t i v e R a i l C a pa b i l i t y
1 General Description
2 Key Features
The SPDT (single-pole/double-throw) switch AS1747
allows signals below ground to pass through without distortion. This analog switch is ideal for switching audio
signals, due to the supply voltage from +1.8V to +5.5V
and the low 0.4Ω on-resistance.
This SPDT switch is available in space-saving 10-pin
TDFN 3x3 packages and operate over the -40ºC to
+85ºC extended temperature range.
!
Distortion -Free Negative Signal Throughput Down
to VCC - 5.5V
!
Low On-Resistance (RON)
0.4Ω at +2.7V Supply
!
0.25Ω On-Resistance Flatness
!
0.03Ω On-Resistance Matching
!
+1.8V to 5.5V Supply Voltage
!
-90dB Crosstalk (100kHz)
!
-65dB Off-Isolation (100kHz)
!
Available in 10-pin TDFN 3x3 Packages
3 Applications
The device is ideal for cell phones, PDAs and hand-held
devices, notebook computers and MP3 players.
Figure 1. AS1747 - Typical Operating Circuit
Out+
Audio
Source 1
NC1
Out-
COM1
NO1
IN1
8Ω
Speaker
AS1747
IN2
NC2
COM2
Out+
Audio
Source 2
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Out-
Input
Select
NO2
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AS1747
Datasheet - P i n o u t
4 Pinout
Pin Assignment
Figure 2. Pin Assignments (Top View)
VCC 1
10 NO2
9 COM2
NO1 2
8 NC2
COM1 3
NC1 4
7 IN2
IN1 5
6 GND
Pin Description
Table 1. Pin Description
Pin Name
TDFN
Description
VCC
1
Positive-Supply Voltage Input
NO1
2
Analog Switch 1 - Normally Open Terminal
COM1
3
Analog Switch 1 - Common Terminal
NC1
4
Analog Switch 1 - Normally Closed Terminal
IN1
5
Digital Control Input for Analog Switch 1. A logic LOW on IN1 connects
COM1 to NC1 and a logic HIGH connects COM1 to NO1.
GND
6
Ground
IN2
7
Digital Control Input for Analog Switch 2. A logic LOW on IN2 connects
COM2 to NC2 and a logic HIGH connects COM2 to N02.
NC2
8
Analog Switch 2 - Normally Closed Terminal
COM2
9
Analog Switch 2 - Common Terminal
NO2
10
Analog Switch 2 - Normally Open Terminal
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AS1747
Datasheet - A b s o l u t e M a x i m u m R a t i n g s
5 Absolute Maximum Ratings
Stresses beyond those listed in Table 2 may cause permanent damage to the device. These are stress ratings only,
and functional operation of the device at these or any other conditions beyond those indicated in Electrical Characteristics on page 4 is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
Table 2. Absolute Maximum Ratings
Parameter
Min
Max
Units
VCC, IN_
-0.3
+6.0
V
COM_, NO_, NC_
VCC - 6
VCC +
0.3
V
Closed-Switch Continuous Current COM_,
NO_, NC_
±150
mA
Open-Switch Continuous Current NO_, NC_
±30
mA
Peak Current COM_, NO_, NC_
(pulsed at 1ms, 10% duty cycle)
±400
mA
1951
mW
Comments
Continuous Power Dissipation (TA = +70ºC)
10-Pin TDFN
(derate 24.4mW/ºC above +70ºC)
ESD
2
kV
HBM MIL-Std. 883E 3015.7 methods
@25°C, JEDEC 78
Latchup Immunity
-200
+200
mA
Operating Temperature Range
-40
+85
ºC
+150
ºC
+150
ºC
Junction Temperature
Storage Temperature Range
Package Body Temperature
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-65
+260
Revision 1.01
ºC
The reflow peak soldering temperature
(body temperature) specified is in
accordance with IPC/JEDEC J-STD020D “Moisture/Reflow Sensitivity
Classification for Non-Hermetic Solid
State Surface Mount Devices”.
The lead finish for Pb-free leaded
packages is matte tin (100% Sn).
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AS1747
Datasheet - E l e c t r i c a l C h a r a c t e r i s t i c s
6 Electrical Characteristics
VCC = +2.7V to +5.5V, TA = -40ºC to +85ºC, unless otherwise specified. Typical values are at VCC = +3.0V, TA = +25ºC,
unless otherwise specified.
Table 3. Electrical Characteristics
Symbol
Parameter
Condition
Min
Typ
Max
Unit
VCC
V
Analog Switch
VNO_
VNC_
VCOM_
Analog Signal Range
RON(NC)
RON(NO)
On-Resistance
ΔRON
On-Resistance Match
Between Channels
VCC = 2.7V, VNC_ or VNO_ = 0V,
ICOM = 100mA
RFLAT(NC)
On-Resistance
Flatness
VCC = 2.7V; VNC_ or VNC = -1V,
0V, 1V, 2V, VCC; ICOM_ = 100mA
INO_(OFF)
INC_(OFF)
NO_, NC_
Off-Leakage Current
VCC = 2.7V, switch open;
VNC_ or VNO_ = -2.5V, +2.5V;
VCOM_ = +2.5V, -2.5V
ICOM_(ON)
COM_
On-Leakage Current
VCC 5.5
VCC = 2.7V; VNC_ or VNO_ = VCC - TA = +25ºC
5.5V, -1V, 0V, 1V, 2V, VCC; ICOM_ = TA = TMIN to
100mA
TMAX
0.4
TA = +25ºC
0.03
0.85
0.95
TA = TMIN to
TMAX
0.1
0.15
TA = +25ºC
0.25
TA = TMIN to
TMAX
Ω
0.4
0.45
TA = +25ºC
-10
+10
TA = TMIN to
TMAX
-200
+200
-10
+10
-200
+200
VCC = 2.7V, switch closed;
TA = +25ºC
VNC_ or VNO_ = -2.5V, +2.5V; or
floating; VCOM_ = -2.5V, +2.5V, or TA = TMIN to
TMAX
floating
Ω
Ω
nA
nA
Dynamic Characteristics
tON
Turn-On Time
1
VNO = 2.5V; for NO_, VIN_ = 0V to TA = +25ºC
VCC; for NC_, VIN_ = VCC to 0V; TA = TMIN to
RL = 300Ω, CL = 35pF, Figure 15
TMAX
200
100
400
400
ns
tOFF
Turn-Off Time
VNC = 2.5V; for NO_, VIN_ = VCC TA = +25ºC
to 0V; for NC_, VIN_ = 0V to VCC; TA = TMIN to
RL = 300Ω, CL = 35pF, Figure 15
TMAX
tD
Break-Before-Make
Time Delay
VN_ = 2.5V, for NO_, VIN_ = VCC to 0V; for NC_,
VIN_ = 0V to VCC; RL = 300Ω, CL = 35pF,
Figure 16
200
ns
Q
Charge Injection
VCOM_ = 0V, RS = 0Ω, CL = 1.0nF, Figure 17
2
pC
VISO
Off-Isolation
VCC = 5V, f = 100kHz, VCOM_ = 1VRMS, RL =
50Ω, CL = 5pF, Figure 18
-65
dB
VCT
Crosstalk
VCC = 5V, f = 100kHz, VCOM_ = 1VRMS, RL =
50Ω, CL = 5pF, Figure 18
-90
dB
PSRR
Power-Supply
Rejection Ratio
f = 10kHz, VCOM_ = 1VRMS, RL = 50Ω, CL = 5pF
70
dB
BW
On-Channel-3dB
Bandwidth
VCC = 5V, Signal = 0dBm, RL = 50Ω, CL = 5pF,
Figure 18
31
MHz
THD
Total Harmonic
Distortion
f = 20Hz to 20kHz, VCOM_ = 0.5VP-P, DC Bias =
0, RL = 32Ω
0.01
%
CNO_(Off)
CNC_(Off)
NO_, NC_ OffCapacitance
f = 1MHz, VCOM_ = 0.5VP-P, DC Bias = 0
63
pF
1
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Revision 1.01
200
200
ns
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AS1747
Datasheet - E l e c t r i c a l C h a r a c t e r i s t i c s
Table 3. Electrical Characteristics (Continued)
Symbol
Parameter
CCOM_(ON) COM On-Capacitance
Condition
Min
f = 1MHz, VCOM_ = 0.5VP-P, DC Bias = 0
Typ
Max
196
Unit
pF
Digital I/O (IN_)
VIH
Input Logic High
Voltage
VCC = 2.7V to 3.6V
1.4
VCC = 4.2V to 5.5V
2.0
VIL
Input Logic Low
Voltage
VCC = 2.7V to 3.6V
0.5
VCC = 4.2V to 5.5V
0.8
IIN
Input Leakage Current
VIN_ = 0V to VCC, VCC = 5.5V
V
V
-1
+1
µA
1.8
5.5
V
1
µA
Power Supply
VCC
Power-Supply Range
ICC
Supply Current
VCC = 5.5V, VIN_ = 0V or VCC
0.01
1. Guaranteed by design
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AS1747
Datasheet - Ty p i c a l O p e r a t i n g C h a r a c t e r i s t i c s
7 Typical Operating Characteristics
VCC = 3.0V, TA = +25ºC (unless otherwise specified).
Figure 3. ON-Resistance vs. VCOM
Figure 4. ON Resistance vs. VCOM; VCC=3.0V
2
0.65
1.8
VCC = 1.8V
1.6
0.55
1.2
RON (Ω)
RON ( Ω)
1.4
VCC = 2.0V
1
0.8
VCC = 2.3V
0.6
0.45
TAMB = +85°C
0.35
TAMB = +25°C
VCC = 2.5V
0.4
VCC = 3.0V
0.2
TAMB = -40°C
0.25
VCC =5.0V
0
0.15
-4
-3
-2
-1
0
1
2
3
4
5
-3
-2
-1
VCOM (V)
0
1
2
3
VCOM (V)
Figure 5. ON Resistance vs. VCOM; VCC=5.0V
Figure 6. Charge Injection vs. VCOM; CLOAD = 1nF
200
0.65
150
100
0.55
0.45
Q (pC)
R ON ( Ω)
50
0.35
TAMB = +85°C
-50
-100
-150
TAMB = +25°C
0.25
0
-200
TAMB = -40°C
-250
Vcc = 3.0V
Vcc = 5.5V
0.15
-300
-1
0
1
2
3
4
-4
5
-2
0
VCOM (V)
Figure 7. Frequency Response
6
1.5
Logic Threshold Voltage (V)
ON- Response
0
-20
Loss (dB)
4
Figure 8. Logic Threshold Voltage vs. VCC
20
-40
OFF- Isolation
-60
Crosstalk
-80
-100
-120
0.001
2
VCOM (V)
1.4
VIN rising
1.3
VIN falling
1.2
1.1
1
0.9
0.8
0.01
0.1
1
10
100
1000
Frequency (MHz)
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0
1
2
3
4
5
6
VCC (V)
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AS1747
Datasheet - Ty p i c a l O p e r a t i n g C h a r a c t e r i s t i c s
Figure 9. Turn-ON/OFF vs. Temperature; VCC = 3V
Figure 10. Turn-ON/OFF Times vs. VCC
250
300
tON
250
200
tON
Time (ns)
Time (ns)
200
150
100
150
100
tOFF
50
50
tOFF
0
-40
0
-15
10
35
60
85
1.8
2.3
2.8
3.3
Temperature (°C)
Figure 11. Leakage Current vs. Temperature
4.3
4.8
5.3
Figure 12. ICC vs. VCC
100
5
80
4
60
ICC (nA)
Leakage Current (nA)
3.8
VCC (V)
ICOM on
40
IN = VCC
3
2
IN = GND
ICOM off
20
1
0
-40
0
-15
10
35
60
85
1.8
2.3
2.8
3.3
Temperature (°C)
3.8
4.3
4.8
5.3
VCC (V)
Figure 13. Total Harmonic Distortion vs. Frequency
Figure 14. PSRR vs. Frequency
0.1
120
PSRR (dB)
THD (%)
100
0.01
80
60
40
20
0.001
0
10
100
1000
10000
100000
Frequency (Hz)
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0.1
1
10
100
Frequency (kHz)
Revision 1.01
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AS1747
Datasheet - D e t a i l e d D e s c r i p t i o n
8 Detailed Description
The AS1747 operates from a +1.8V to +5.5V supply and features a negative signal capability that allows signals below
ground to pass through without distortion. A break-before-make switching and a low on-resistance is also included in
this analog dual SPDT switch. The device is fully specified for a 3.0V application.
9 Application Information
Digital Control Inputs
The logic inputs of the AS1747 accept up to +5.5V independent of the supply voltage. Due to this a mixing of the logic
levels in a system is possible. For example, with a +3.3V supply, IN_ can be driven low to GND and high to +5.5V. For
a +1.8V supply voltage, the logic levels are 0.5V (low) and 1.4V (high); for a +5V supply voltage, the logic levels are
0.8V (low) and 2.0V (high).
Analog Signal Levels
The change of the on-resistance of the AS1747 is very little for analog input signals over the whole supply voltage
range. The switches are bi-directional, so the NO_, NC_, and COM_ pins can be either inputs or outputs.
The AS1747 pass signals as low as VCC - 5.5V, including signals below ground with minimal distortion.
Power-Supply Sequencing and Overvoltage Protection
Caution: Do not exceed the absolute maximum ratings since stresses beyond the listed ratings may cause
permanent damage to the device.
Proper power-supply sequencing is recommended for all CMOS devices. Always apply VCC before applying analog
signals, especially if the analog signal is not current-limited.
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AS1747
Datasheet - Ti m i n g D i a g r a m s
10 Timing Diagrams
Figure 15. Switching Time
VCC
VCC
COM_
NO_
VN_
VOUT
OR NC_
CL includes fixture and stray capacitance
VOUT = VN_(RL / (RL + RON))
CL
RL
IN_
GND
Logic
Input
tr < 5ns
tf < 5ns
VCC
Logic
Input
50%
0V
IN depends on switch configuration;
Input polarity determined by sense of switch.
tOFF
VOUT
Switch
Output
0.9 x VOUT
0.9 x VOUT
0V
tON
Figure 16. Break-Before-Make Interval
VCC
VCC
NC_
VN_
Logic
Input
VOUT
COM_
VCC
50%
0V
NO_
CL
RL
IN_
GND
Logic
Input
0.9 x VOUT
VOUT
tBBM
CL includes fixture and stray capacitance
Figure 17. Charge Injection
VCC
ΔVOUT
VCC
VOUT
RGEN
NC_
COM_
VOUT
OR NO_
IN
OFF
OFF
ON
+
CL
VGEN
GND
ON
IN_
IN
Q = (ΔVOUT)(CL)
OFF
Logic input waveforms inverted for switches
that have the opposite logic sense.
VIL to VIH
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OFF
Revision 1.01
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AS1747
Datasheet - Ti m i n g D i a g r a m s
Figure 18. On-Loss, Off-Isolation, and Crosstalk
+5V
10nF
Network Analyzer
VCC
0V or VCC
VIN
50Ω
50Ω
COM1
IN_
AS1747
NO1*
NC1
50Ω
VOUT
MEAS
REF
GND
50Ω
50Ω
*For crosstalk this pin is NO2.
NC2 and COM2 are open.
Off-Isolation = 20log
Measurements are standardized against shorts at IC terminals. Off-Isolation is
measured between COM_
and “OFF” NO_ or NC_ terminal on each switch. On-Loss is measured between
COM_ and “ON” NO_ or NC_ terminal on each switch. Crosstalk is measured from
one channel to the other channel. Signal direction through switch is reversed;
worst values are recorded.
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Revision 1.01
VOUT
---------------VIN
On-Loss = 20log
VOUT
---------------VIN
Crosstalk = 20log
VOUT
---------------VIN
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AS1747
Datasheet - P a c k a g e D r a w i n g s a n d M a r k i n g s
11 Package Drawings and Markings
The devices are available in 10-pin TDFN 3x3 package.
Figure 19. 10-pin TDFN 3x3 Package Dimensions
D2
SEE
DETAIL B
A
D
D2/2
B
2x
E
E2
E2/2
L
aaa C
PIN 1 INDEX AREA
(D/2 xE/2)
K
PIN 1 INDEX AREA
(D/2 xE/2)
N N-1
aaa C 2x
e
TOP VIEW
e
(ND-1) X e
b
ddd
bbb
C
C A B
BTM VIEW
Terminal Tip
DETAIL B
A3
ccc C
A
C
SEATING
PLANE
0.08 C
A1
SIDE VIEW
Datum A or B
ODD TERMINAL SIDE
Symbol
A
A1
A3
θ
aaa
bbb
ccc
ddd
eee
ggg
Min
0.70
0.00
0º
Nom
0.75
0.02
0.20 REF
--0.15
0.10
0.10
0.05
0.08
0.10
Max
0.80
0.05
Symbol
D BSC
E BSC
D2
E2
L
K
b
e
N
ND
14º
Min
2.20
1.40
0.30
0.20
0.18
Nom
3.00
3.00
----0.40
--0.25
0.50
10
5
Max
2.70
1.75
0.50
--0.30
Notes:
1.
2.
3.
4.
5.
Figure 19 is shown for illustration only.
Dimensioning and tolerancing conform to ASME Y14.5M-1994.
All dimensions are in millimeters, angle is in degrees.
N is the total number of terminals.
ND refers to the maximum number of terminals on D side.
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AS1747
Datasheet - O r d e r i n g I n f o r m a t i o n
12 Ordering Information
The devices are available as the standard products shown in Table 4.
Table 4. Ordering Information
Model
AS1747-BTDT
Description
Delivery Form
Dual 0.6Ohm SPDT, Audio Clickless Switch with
Negative Rail Capability
Tape & Reel
Package
10-pin TDFN
(3.0mm x 3.0mm)
Note: All products are RoHS compliant and Pb-free.
Buy our products or get free samples online at ICdirect: http://www.austriamicrosystems.com/ICdirect
For further information and requests, please contact us mailto:sales@austriamicrosystems.com
or find your local distributor at http://www.austriamicrosystems.com/distributor
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AS1747
Datasheet
Copyrights
Copyright © 1997-2009, austriamicrosystems AG, Tobelbaderstrasse 30, 8141 Unterpremstaetten, Austria-Europe.
Trademarks Registered ®. All rights reserved. The material herein may not be reproduced, adapted, merged,
translated, stored, or used without the prior written consent of the copyright owner.
All products and companies mentioned are trademarks or registered trademarks of their respective companies.
Disclaimer
Devices sold by austriamicrosystems AG are covered by the warranty and patent indemnification provisions appearing
in its Term of Sale. austriamicrosystems AG makes no warranty, express, statutory, implied, or by description regarding
the information set forth herein or regarding the freedom of the described devices from patent infringement.
austriamicrosystems AG reserves the right to change specifications and prices at any time and without notice.
Therefore, prior to designing this product into a system, it is necessary to check with austriamicrosystems AG for
current information. This product is intended for use in normal commercial applications. Applications requiring
extended temperature range, unusual environmental requirements, or high reliability applications, such as military,
medical life-support or life-sustaining equipment are specifically not recommended without additional processing by
austriamicrosystems AG for each application. For shipments of less than 100 parts the manufacturing flow might show
deviations from the standard production flow, such as test flow or test location.
The information furnished here by austriamicrosystems AG is believed to be correct and accurate. However,
austriamicrosystems AG shall not be liable to recipient or any third party for any damages, including but not limited to
personal injury, property damage, loss of profits, loss of use, interruption of business or indirect, special, incidental or
consequential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the technical data herein. No obligation or liability to recipient or any third party shall arise or flow out of
austriamicrosystems AG rendering of technical or other services.
Contact Information
Headquarters
austriamicrosystems AG
Tobelbaderstrasse 30
A-8141 Unterpremstaetten, Austria
Tel: +43 (0) 3136 500 0
Fax: +43 (0) 3136 525 01
For Sales Offices, Distributors and Representatives, please visit:
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