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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
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 0.4 on-resistance. This SPDT switch is available in space-saving 10-pin TDFN 3x3 packages and operate over the -40C to +85C extended temperature range.
2 Key Features
!
Distortion -Free Negative Signal Throughput Down to VCC - 5.5V Low On-Resistance (RON) 0.4 at +2.7V Supply 0.25 On-Resistance Flatness 0.03 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 Out-
NC1 COM1 NO1
IN1
Input Select
AS1747
NC2 IN2
8 Speaker
Out+ Audio Source 2 OutNO2
COM2
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AS1747
Datasheet - P i n o u t
4 Pinout
Pin Assignment
Figure 2. Pin Assignments (Top View)
VCC 1 NO1 2 COM1 3 NC1 4 IN1 5
10 NO2 9 COM2 8 NC2 7 IN2 6 GND
Pin Description
Table 1. Pin Description Pin Name VCC NO1 COM1 NC1 IN1 GND IN2 NC2 COM2 NO2 TDFN 1 2 3 4 5 6 7 8 9 10 Positive-Supply Voltage Input Analog Switch 1 - Normally Open Terminal Analog Switch 1 - Common Terminal Analog Switch 1 - Normally Closed Terminal Digital Control Input for Analog Switch 1. A logic LOW on IN1 connects COM1 to NC1 and a logic HIGH connects COM1 to NO1. Ground Digital Control Input for Analog Switch 2. A logic LOW on IN2 connects COM2 to NC2 and a logic HIGH connects COM2 to N02. Analog Switch 2 - Normally Closed Terminal Analog Switch 2 - Common Terminal Analog Switch 2 - Normally Open Terminal Description
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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 VCC, IN_ COM_, NO_, NC_ Closed-Switch Continuous Current COM_, NO_, NC_ Open-Switch Continuous Current NO_, NC_ Peak Current COM_, NO_, NC_ (pulsed at 1ms, 10% duty cycle) Continuous Power Dissipation (TA = +70C) 10-Pin TDFN (derate 24.4mW/C above +70C) ESD Latchup Immunity Operating Temperature Range Junction Temperature Storage Temperature Range -65 -200 -40 2 +200 +85 +150 +150 1951 mW kV mA C C C 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). HBM MIL-Std. 883E 3015.7 methods @25C, JEDEC 78 Min -0.3 VCC - 6 Max +6.0 VCC + 0.3 150 30 400 Units V V mA mA mA Comments
Package Body Temperature
+260
C
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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 = -40C to +85C, unless otherwise specified. Typical values are at VCC = +3.0V, TA = +25C, unless otherwise specified. Table 3. Electrical Characteristics Symbol Analog Switch VNO_ VNC_ VCOM_ RON(NC) RON(NO) Analog Signal Range VCC = 2.7V; VNC_ or VNO_ = VCC - TA = +25C 5.5V, -1V, 0V, 1V, 2V, VCC; ICOM_ = TA = TMIN to 100mA TMAX VCC = 2.7V, VNC_ or VNO_ = 0V, ICOM = 100mA TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX -10 -200 -10 -200 0.25 VCC 5.5 0.4 VCC 0.85 0.95 0.03 0.1 0.15 0.4 0.45 +10 +200 +10 +200 nA nA V Parameter Condition Min Typ Max Unit
On-Resistance
RON
On-Resistance Match Between Channels
RFLAT(NC)
On-Resistance Flatness
VCC = 2.7V; VNC_ or VNC = -1V, 0V, 1V, 2V, VCC; ICOM_ = 100mA VCC = 2.7V, switch open; VNC_ or VNO_ = -2.5V, +2.5V; VCOM_ = +2.5V, -2.5V
INO_(OFF) INC_(OFF)
NO_, NC_ Off-Leakage Current
ICOM_(ON)
COM_ On-Leakage Current
VCC = 2.7V, switch closed; TA = +25C VNC_ or VNO_ = -2.5V, +2.5V; or floating; VCOM_ = -2.5V, +2.5V, or TA = TMIN to TMAX floating VNO = 2.5V; for NO_, VIN_ = 0V to TA = +25C VCC; for NC_, VIN_ = VCC to 0V; TA = TMIN to RL = 300, CL = 35pF, Figure 15 TMAX VNC = 2.5V; for NO_, VIN_ = VCC TA = +25C to 0V; for NC_, VIN_ = 0V to VCC; TA = TMIN to RL = 300, CL = 35pF, Figure 15 TMAX VN_ = 2.5V, for NO_, VIN_ = VCC to 0V; for NC_, VIN_ = 0V to VCC; RL = 300, CL = 35pF, Figure 16 VCOM_ = 0V, RS = 0, CL = 1.0nF, Figure 17 VCC = 5V, f = 100kHz, VCOM_ = 1VRMS, RL = 50, CL = 5pF, Figure 18 VCC = 5V, f = 100kHz, VCOM_ = 1VRMS, RL = 50, CL = 5pF, Figure 18 f = 10kHz, VCOM_ = 1VRMS, RL = 50, CL = 5pF VCC = 5V, Signal = 0dBm, RL = 50, CL = 5pF, Figure 18 f = 20Hz to 20kHz, VCOM_ = 0.5VP-P, DC Bias = 0, RL = 32 f = 1MHz, VCOM_ = 0.5VP-P, DC Bias = 0
Dynamic Characteristics 200 400 400 100 200 200 200 2 -65 -90 70 31 0.01 63 ns ns tON
1
Turn-On Time
tOFF
Turn-Off Time
1
tD Q VISO VCT PSRR BW THD CNO_(Off) CNC_(Off)
Break-Before-Make Time Delay Charge Injection Off-Isolation Crosstalk Power-Supply Rejection Ratio On-Channel-3dB Bandwidth Total Harmonic Distortion NO_, NC_ OffCapacitance
ns pC dB dB dB MHz % pF
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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 Digital I/O (IN_) VIH Input Logic High Voltage Input Logic Low Voltage Input Leakage Current Power-Supply Range Supply Current VCC = 5.5V, VIN_ = 0V or VCC VCC = 2.7V to 3.6V VCC = 4.2V to 5.5V VCC = 2.7V to 3.6V VCC = 4.2V to 5.5V VIN_ = 0V to VCC, VCC = 5.5V -1 1.8 0.01 1.4 2.0 0.5 0.8 +1 5.5 1 V Parameter Condition f = 1MHz, VCOM_ = 0.5VP-P, DC Bias = 0 Min Typ 196 Max Unit pF
CCOM_(ON) COM On-Capacitance
VIL IIN VCC ICC
V A V A
Power Supply
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 = +25C (unless otherwise specified). Figure 3. ON-Resistance vs. VCOM
2 1.8
VCC = 1.8V
Figure 4. ON Resistance vs. VCOM; VCC=3.0V
0.65
1.6 1.4
0.55
RON ( )
1 0.8 0.6 0.4 0.2 0 -4 -3 -2 -1 0 1
VCC = 2.0V
RON ()
1.2
0.45
TAMB = +85C
VCC = 2.3V VCC = 2.5V VCC = 3.0V VCC =5.0V
0.35
TAMB = +25C TAMB = -40C
0.25
0.15 2 3 4 5 -3 -2 -1 0 1 2 3
VCOM (V) Figure 5. ON Resistance vs. VCOM; VCC=5.0V
0.65
VCOM (V) Figure 6. Charge Injection vs. VCOM; CLOAD = 1nF
200 150
0.55
100 50
R ON ( )
Q (pC)
TAMB = +85C TAMB = +25C TAMB = -40C
0.45
0 -50 -100 -150 -200 -250
Vcc = 3.0V Vcc = 5.5V
0.35
0.25
0.15 -1 0 1 2 3 4 5
-300 -4 -2 0 2 4 6
VCOM (V) Figure 7. Frequency Response
20 0 -20
ON- Response
VCOM (V) Figure 8. Logic Threshold Voltage vs. VCC
1.5
Logic Threshold Voltage (V)
1.4 1.3
VIN rising
VIN falling
Loss (dB)
-40
OFF- Isolation
1.2 1.1 1 0.9 0.8
-60
Crosstalk
-80 -100 -120 0.001
0.01
0.1
1
10
100
1000
0
1
2
3
4
5
6
Frequency (MHz) www.austriamicrosystems.com Revision 1.01
VCC (V) 6 - 13
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
250
tON
Figure 10. Turn-ON/OFF Times vs. VCC
300 250 200
tON
200
Time (ns)
150
Time (ns)
tOFF
150 100
100
50
50
tOFF
0 -40
0 -15 10 35 60 85 1.8 2.3 2.8 3.3 3.8 4.3 4.8 5.3
Temperature (C)
VCC (V)
Figure 11. Leakage Current vs. Temperature
100
Figure 12. ICC vs. VCC
5
Leakage Current (nA)
80
4
IN = VCC
ICOM on
40
ICOM off
ICC (nA)
60
3
2
IN = GND
20
1
0 -40
0 -15 10 35 60 85 1.8 2.3 2.8 3.3 3.8 4.3 4.8 5.3
Temperature (C)
VCC (V)
Figure 13. Total Harmonic Distortion vs. Frequency
0.1
Figure 14. PSRR vs. Frequency
120 100 80 60 40 20
0.01
0.001 10 100 1000 10000 100000
PSRR (dB)
THD (%)
0 0.1 1 10 100
Frequency (Hz)
Frequency (kHz)
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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_
VN_
NO_ OR NC_
VOUT RL CL
CL includes fixture and stray capacitance VOUT = VN_(RL / (RL + RON))
IN_ Logic Input GND
Logic Input
VCC 0V 50%
tr < 5ns tf < 5ns
tOFF VOUT Switch Output 0V tON 0.9 x VOUT 0.9 x VOUT
IN depends on switch configuration; Input polarity determined by sense of switch.
Figure 16. Break-Before-Make Interval
VCC VCC VN_ NC_ COM_ NO_ IN_ Logic Input GND CL includes fixture and stray capacitance RL CL 0.9 x VOUT tBBM VOUT Logic Input
VCC 50% 0V
VOUT
Figure 17. Charge Injection
VCC VOUT VCC VOUT RGEN + VGEN GND IN_ IN NC_ OR NO_ CL ON OFF Q = (VOUT)(CL) OFF COM_ VOUT IN
OFF ON
OFF
VIL to VIH
Logic input waveforms inverted for switches that have the opposite logic sense.
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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 IN_ AS1747 NC1 50 GND 50 50 NO1* VOUT MEAS REF COM1 VIN 50 50
*For crosstalk this pin is NO2. NC2 and COM2 are open. Off-Isolation = 20log
VOUT --------------VIN
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.
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
D D2 SEE DETAIL B B A L E2/2
2x aaa C PIN 1 INDEX AREA (D/2 xE/2)
D2/2
E2 K N N-1 e (ND-1) X e b ddd bbb C CAB
BTM VIEW
PIN 1 INDEX AREA (D/2 xE/2)
aaa C 2x TOP VIEW
e DETAIL B
Terminal Tip
ccc C
E
A3
C
SEATING PLANE
0.08 C
A
Datum A or B ODD TERMINAL SIDE
Symbol A A1 A3 aaa bbb ccc ddd eee ggg Notes:
Min 0.70 0.00
0
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
14
Symbol D BSC E BSC D2 E2 L K b e N ND
Min
2.20 1.40 0.30 0.20 0.18
Nom 3.00 3.00 ----0.40 --0.25 0.50 10 5
A1
SIDE VIEW
Max
2.70 1.75 0.50 --0.30
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 Description Delivery Form Package
AS1747-BTDT
Dual 0.6Ohm SPDT, Audio Clickless Switch with Negative Rail Capability
Tape & Reel
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 (c) 1997-2009, austriamicrosystems AG, Tobelbaderstrasse 30, 8141 Unterpremstaetten, Austria-Europe. Trademarks Registered (R). 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: http://www.austriamicrosystems.com/contact
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