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Da t as heet
AS1746
0 . 5 / 0 . 6 , L o w - Vo l ta g e , D u a l S P D T A n a l o g S w i t c h
1 General Description
The AS1746 is a low on-resistance (RON), low-voltage, dual-single-pole/double-throw (SPDT) analog switch designed to operate from a single +1.8 to +5.5V supply. The device features a 0.5 (max) RON for normally closed (NC) switches and a 0.6 (max) RON for normally open (NO) switches using a +2.7V supply. The AS1746 features break-before-make switching (2ns) with tON = 50ns and tOFF = 30ns (using a +2.7V supply). The digital logic inputs are 1.8V logic-compatible with +2.7 to +3.3V supplies. The AS1746 is available in a TDFN-10 (3x3mm) package and a WL-CSP-10 package.
2 Key Features
! ! ! ! ! ! ! ! ! ! ! ! !
Single Supply Operation: +1.8V to +5.5V Normally Closed Switch RON: 0.45 (+2.7V Supply) Normally Open Switch RON: 0.55 (+2.7V Supply) RON Matching Between Channels: 0.06 RON Flatness Over Signal Range: 0.15 Supply Current: 50nA Rail-to-Rail Signal Handling 1.8V Logic Compatibility Low Crosstalk: -60dB (100kHz) High Off-Isolation: -64dB (100kHz) Total Harmonic Distortion: 0.025% Ultra-Low Leakage Currents: 1nA (@ TAMB = +25C) Package Types: - TDFN-10 (3x3mm) - WL-CSP-10
3 Applications
The device is ideal for audio headsets, MP3 players, power routing switches, relay replacements, audio and video signal routing, communications circuits, PCMCIA cards, mobile phones, MODEMs, and any battery-operated equipment. Figure 1. AS1746 - Block Diagram
AS1746
V+ 1 NO1 2 COM1 3 IN1 4 NC1 5 10 NO2
Truth Table
9 COM2 8 IN2 7 NC2 6 GND
IN
Low High
NOx to COM
Off On
NCx to COM
On Off
Switch shown for logic low input.
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AS1746
Datasheet - P i n o u t
4 Pinout
Pin Assignments
Figure 2. Pin Assignments (Top View)
GND V+ 1 NO1 2 COM1 3 IN1 4 NC1 5 TDFN-10 (3x3mm) 10 NO2 9 COM2 IN1 C2 A2 IN2 NC1 C1 B1 A1 NC2
AS1746
8 IN2 7 NC2 6 GND COM1 C3
AS1746
A3 COM2
NO1
C4
B4 V+ WL-CSP-10
A4
NO2
Pin Descriptions
Table 1. Pin Descriptions Pin Number Pin Name V+ NO1 COM1 IN1 NC1 GND NC2 IN2 COM2 NO2 Description Positive Input Supply Voltage Normally Open Analog Switch 1 Analog Switch 1 Common Switch 1 Digital Input Normally Closed Analog Switch 1 Ground Normally Closed Analog Switch 2 Switch 2 Digital Input Analog Switch 2 Common Normally Open Analog Switch 2
See Figure 2
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AS1746
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 V+, INx to GND COMx, NOx, NCx, to GND COMx, NOx, NCx Continuous Current COMx, NOx, NCx Peak Current COMx, NOx, NCx Peak Current Continuous Power Dissipation Electro-Static Discharge Latchup Immunity Operating Ambient Temperature Range Storage Temperature Range -40 -65 2.5 250 +85 +150 Min -0.3 -0.3 Max +7 V+ + 0.3 +300 +400 +500 444 Units V V COMx, NOx, NCx signals exceeding V+ or GND are internally clamped by diodes and forwarddiode current must be limited to the maximum current rating. Comments
-300 -400 -500
mA mA mA mW kV mA C C The reflow peak soldering temperature (body temperature) specified is in accordance with IPC/JEDEC J-STD-020D "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). Pulsed at 50% duty cycle Pulsed at 10% duty cycle TAMB = +70C HBM Mil-Std883E 3015.7 methods Class II, Level A
Package Body Temperature
+260
C
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AS1746
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
(V+ = +2.7V to +3.3V, VIH = +1.4V, VIL = +0.5V, TAMB = -40C to +85C (unless otherwise specified). Typical values are at +3V and +25C. Table 3. Electrical Characteristics Symbol Analog Switch VNOx, VNCx, VCOMx Analog Signal Range V+ = 2.7V, ICOMx = 100mA, VNCx = 0 to V+, TAMB = 25C V+ = 2.7V, ICOMx = 100mA, VNCx = 0 to V+ V+ = 2.7V, ICOMx = 100mA, VNOx = 0 to V+, TAMB = 25C V+ = 2.7V, ICOMx = 100mA, VNOx = 0 to V+ V+ = 2.7V, ICOMx = 100mA, VNCx/VNOx = 1.5V V+ = 2.7V, ICOMx = 100mA, VNCx = 0 to V+ V+ = 2.7V, ICOMx = 100mA, VNOx = 0 to V+ V+ = 3.3V, VNOx/VNCx = 3V, 0.3V, VCOMx = 0.3V, 3V, TAMB = 25C V+ = 3.3V, VNOx/VNCx = 3V, 0.3V, VCOMx = 0.3V, 3V V+ = 3.3V, VNOx/VNCx = 3V, 0.3V or float, VCOMx = 3V, 0.3V, or float, TAMB = 25C V+ = 3.3V, VNOx/VNCx = 3V, 0.3V or float, VCOMx = 3V, 0.3V, or float V+ = 2.7V, VNOx/VNCx = 1.5V, RLOAD = 50, CLOAD = 35pF, TAMB = 25C V+ = 2.7V, VNOx/VNCx = 1.5V, RLOAD = 50, CLOAD = 35pF (see Figure 17 on page 10) V+ = 2.7V, VNOx/VNCx = 1.5V, RLOAD = 50, CLOAD = 35pF, TAMB = 25C V+ = 2.7V, VNOx/VNCx = 1.5V, RLOAD = 50, CLOAD = 35pF (see Figure 17 on page 10) V+ = 2.7V, VNOx/VNCx = 1.5V, RLOAD = 50, CLOAD = 35pF (see Figure 18 on page 10) COMx = 0, RS = 0, CLOAD = 1nF (see Figure 19 on page 10) 2 15 200 20 -1 -10 -2 -30 0.02 0.06 0.1 0.35 0 0.3 V+ 0.45 0.5 0.55 0.6 0.06 0.15 0.35 1 10 2 30 nA nA nA nA V Parameter
1
Condition
Min
Typ
Max
Unit
RON(NC)
NCx On-Resistance
RON(NO)
NOx On-Resistance
RON RFLAT(NC) RFLAT(NO)
On-Resistance Match 2 Between Channels NCx On-Resistance 3 Flatness NOx On-Resistance 3 Flatness NCx or NOx Off4 Leakage Current
INOxOFF/ INCxOFF
ICOMxON
COMx On-Leakage 4 Current
Dynamic Characteristics 30 50 ns 60
tON
Turn On Time
5
30 ns 35
tOFF
Turn Off Time
5
tBBM Q
Break-Before-Make 5 Delay Charge Injection
ns pC
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AS1746
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 VISO Parameter Off-Isolation
1
Condition VCOMx = 1VRMS, RLOAD = 50, CLOAD = 5pF, f = 100kHz (see Figure 20 on page 11) VCOMx = 1VRMS, RLOAD = 50, CLOAD = 5pF, f = 100kHz (see Figure 20 on page 11) RLOAD = 600, INx = 2VP-P, f = 20Hz to 20kHz f = 1MHz (see Figure 21 on page 11) f = 1MHz (see Figure 21 on page 11) f = 1MHz (see Figure 21 on page 11) f = 1MHz (see Figure 21 on page 11)
Min
Typ -64
Max
Unit dB
6
VXT THD CNCXOFF CNOXOFF CNCXON CNOXON Digital I/O VIH VIL IINx Power Supply V+ I+
Crosstalk Total Harmonic Distortion NCx Off-Capacitance NOx Off-Capacitance NCx On-Capacitance NOx On-Capacitance Input Logic High Input Logic Low INx Input Leakage Current
-60 0.025 84 37 190 150 1.4 0.5
dB % pF pF pF pF V V A
VINx = 0 or V+
-1
1
Power Supply Range V+ = 5.5V; VINx = 0 or V+, TAMB = 25C Supply Current V+ = 5.5V; VINx = 0 or V+
1.8 -50 -350
5.5 50 350
V nA
1. The algebraic convention used in this data sheet is such that the most negative value is the minimum and the most positive value is the maximum. 2. RON = RON(MAX) - RON(MIN) between pins NC1 and NC2 or between pins NO1 and NO2. 3. Flatness is defined as the difference between the maximum and minimum value of RON as measured over the specified analog signal ranges. 4. 100% tested. 5. Guaranteed by design. 6. Off-isolation = 20LOG10 (VCOM/VNO), VCOM = output, VNO = input to off switch.
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AS1746
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
TAMB = +25C. Values measured in TDFN-10 (3x3mm) package. Figure 3. NC ON-Resistance vs. VCOM
0.7
VDD = 1.8V
Figure 4. NO ON-Resistance vs. VCOM
1.1 1.0 0.9
VDD = 1.8V
0.6
R ON () .
0.5
R ON () .
VDD = 2.0V
0.8 0.7 0.6 0.5 0.4 0.3
VDD = 2.3V VDD = 2.5V VDD = 3.0V VDD =5.0V VDD = 2.0V
0.4
0.3
VDD = 2.3V VDD = 2.5V VDD = 3.0V
VDD =5.0V
0.2 0 1 2 3 4 5
0.2
0
1
2
3
4
5
VCOM (V)
VCOM (V)
Figure 5. NC ON-Resistance vs. VCOM, 5V
0.45 0.40 0.35
TAMB = +85C
Figure 6. NO ON-Resistance vs. VCOM, 5V
0.45 0.40 0.35 0.30 0.25
TAMB = +25C TAMB = +85C
R ON () .
0.30 0.25
TAMB = +25C
0.20
TAMB = -40C
R ON () .
0.20
TAMB = -40C
0.15 0 1 2 3 4 5
0.15 0 1 2 3 4 5
VCOM (V)
VCOM (V)
Figure 7. NC ON-Resistance vs. VCOM, 3V
0.45 0.40 0.35 0.30
TAMB = +25C
Figure 8. NO ON-Resistance vs. VCOM, 3V
0.50 0.45
TAMB = +85C
TAMB = +85C
0.40
R ON () .
R ON () .
0.35 0.30 0.25
TAMB = +25C
0.25
TAMB = -40C
TAMB = -40C
0.20 0.15 0 0.5 1 1.5 2 2.5 3
0.20 0.15 0 0.5 1 1.5 2 2.5 3
VCOM (V)
VCOM (V)
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AS1746
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, VDD = 3V
35
NC
Figure 10. Turn-ON/OFF Times vs. VSupply
90 80
30
tON
70
tON /tOFF (ns) .
tON /tOFF (ns) .
NO
60 50 40
tON
25
20
NO tOFF
30 20 10
tOFF
15
NC
10 -40
0 -15 10 35 60 85 1.5 2.5 3.5 4.5 5.5
Temperature (C)
VSupply (V)
Figure 11. Logic Threshold Voltage vs. Supply Voltage
1.5
Figure 12. Charge Injection vs. COM Voltage
350 300 250
Logic Threshold Voltage (V)
.
VIN rising
1
200
Q (pC) .
5 6
VIN falling
150 100 50 0 -50 -100
0.5
0 0 1 2 3 4
-150 0 1 2 3 4 5 6
Supply Voltage (V)
VCOM (V)
Figure 13. Frequency Response
0
ON- Response
Figure 14. THD+N vs. Frequency
0.05
-20
0.04
-40
THD+N (%) .
1000
Loss (dB) .
Crosstalk OFF- Isolation
0.03
-60
0.02
-80
0.01
-100 0.001
0 0.1 10 10 1000 100000
Frequency (MHz)
Frequency (Hz)
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AS1746
Datasheet - D e t a i l e d D e s c r i p t i o n
8 Detailed Description
The AS1746 is a low on-resistance, low-voltage, asymmetrical dual-SPDT analog switch designed to operate from a single +1.8 to +5.5V supply. The device is fully specified for nominal 3V applications and features break-before-make switching and fast switching speeds (tON = 60ns max, tOFF = 35ns max). The device provides 0.5 (max) RON for its NC switch, and 0.6 (max) RON for its NO switch for applications that require asymmetrical loads. Figure 15. AS1746 - Block Diagram - WL-CSP-10
AS1746
GND NC1 C1 B1 A1 NC2
IN1
C2
A2
IN2
COM1
C3
A3
COM2
NO1
C4
B4 V+
A4
NO2
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AS1746
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
9 Application Information
Digital Control Inputs
The AS1746 logic inputs can handle up to +5.5V regardless of the supply voltage. For example, with a +3.3V supply, INx may be driven low to GND and high to 5.5V. Driving INx rail-to-rail minimizes power consumption.
Analog Signal Levels
Analog signals that range over the entire supply voltage (V+ to GND) are passed with very little change in RON (see Typical Operating Characteristics on page 6). The switches are bi-directional, so the NOx, NCx, and COMx pins can be used as inputs or outputs.
Power Supply Sequencing
Proper power supply sequencing is recommended for all CMOS devices. The recommended sequence is as follows: 1. V+ 2. NOx, NCx, COMx Always apply V+ before applying analog signals, especially if the analog signal is not current limited. If this sequencing is not possible, and if the analog inputs are not current limited to <20mA, add a small signal protection diode (D1) as shown in Figure 16.
Overvoltage Protection
Using a protection diode will reduce the analog range to a diode voltage drop (approximately 0.7V) below V+ (for D1). RON will increase slightly at low supply voltages. Caution: The maximum supply voltage (V+) must not exceed +7V. Do not exceed the absolute maximum ratings because stresses beyond the ratings listed in Absolute Maximum Ratings on page 3 may cause permanent damage to the device. Note: Protection diode D1 can also protect the device from some overvoltage conditions. Figure 16. Overvoltage Protections using 2 External Blocking Diodes
AS1746
Positive Supply D1 V+
NO VGEN
COM
GND
Note: No damage will result to the circuit shown in Figure 16 if the supply voltage is below the absolute maximum rating applied to an analog signal pin (NOx, NCx, or COMx).
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AS1746
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
Test Circuits and Timing Diagrams
Figure 17. Switching Time
tR < 5ns tF < 5ns 50% VIL tOFF VOUT Switch Output 0 0.9 x VOUT 0.9 x VOUT 50%
V+ VIN NOx or NCx
AS1746
COMx RLOAD 50 VOUT CLOAD 35pF
VIH Logic Input
INx Logic Input
GND
VOUT = VNx
(
RLOAD RLOAD + RON
)
tON Logic input waveforms inverted for switches that have the opposite logic sense.
Includes stray capacitance and fixture capacitance.
Figure 18. Break-Before-Make Interval
V+ VIN NCx COMx NOx INx Logic Input RLOAD 50 VOUT CLOAD 35pF
VIH
AS1746
Logic Input 0
50%
VOUT GND tD
0.9 x VOUT
Includes stray capacitance and fixture capacitance.
Figure 19. Charge Injection
V+ INx VIL to VIH COMx RGEN VGEN GND CLOAD INx On Off Q = VOUT x CLOAD INx depends on switch configuration; input polarity is determined by the sense of the switches. Off NOx or NCx INx VOUT Off On Off
AS1746
VOUT
VOUT
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AS1746
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
Figure 20. On-Loss, Off-Isolation, Crosstalk
Network Analyzer
+5V 10nF
AS1746
V+ COMx
VIN
50
50
NCx NOx 50 0V or V+ INx GND 50 50 VOUT Measure Reference
Off-isolation = 20LOG(VOUT/VIN) On-loss = 20LOG(VOUT/VIN) Crosstalk = 20LOG(VOUT/VIN)
Notes: 1. 2. 3. 4. Measurements are standardized against short-circuit at all terminals. Off-isolation is measured between COMx and the off NCx/NOx terminal of each switch. Crosstalk is measured from one channel to all other channels. Signal direction through the switch is reversed; worst values are recorded.
Figure 21. Channel On- Off-Capacitance
V+ V+ 10nF
AS1746
COMx
1MHz Capacitance Analyzer
VIH or VIL
INx GND
NCx or NOx
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AS1746
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
10 Package Drawings and Markings
The device is available in a TDFN-10 (3x3mm) package and a WL-CSP-10 package. Figure 22. TDFN-10 (3x3mm) Packagee
D D2 SEE DETAIL B B A L E2/2
aaa C 2x 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 L aaa bbb ccc ddd eee ggg Notes:
Min 0.70 0.00 0.30
Typ 0.75 0.02 0.20 REF 0.40 0.15 0.10 0.10 0.05 0.08 0.10
Max 0.80 0.05 0.50
Notes 1, 2 1, 2 1, 2 1, 2 1, 2 1, 2 1, 2 1, 2 1, 2 1, 2
Symbol D BSC E BSC D2 E2 K b e N ND
Min
Typ 3.00 3.00
A1
SIDE VIEW
Max
2.20 1.40 0 0.20 0.18
2.70 1.75 14 0.25 0.50 10 5 0.30
Notes 1, 2 1, 2 1, 2 1, 2 1, 2 1, 2 1, 2, 5 1, 2 1, 2, 5
1. Figure 22 is shown for illustration only. 2. All dimensions are in millimeters; angles in degrees. 3. Dimensioning and tolerancing conform to ASME Y14.5 M-1994. 4. N is the total number of terminals. 5. The terminal #1 identifier and terminal numbering convention shall conform to JEDEC 95-1, SPP-012. Details of terminal #1 identifier are optional, but must be located within the zone indicated. The terminal #1 identifier may be either a mold or marked feature. 6. Dimension b applies to metallized terminal and is measured between 0.15mm and 0.30mm from the terminal tip. 7. ND refers to the maximum number of terminals on side D. 8. Unilateral coplanarity zone applies to the exposed heat sink slug as well as the terminals
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AS1746
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
Figure 23. WL-CSP-10 Package
A 1
B
C
f e
A1
ob
2
e D1
3
e
4
f e E1 E e f
f A2 A
Dimensions Min Typ 0.677 0.707 0.230 0.250 0.447 0.457 0.301 0.311 2.05 1.5 1.55 1 0.5 0.275
4 3
D
2 1 A B C
Symbol A A1 A2 b D D1 E E1 e f
Max 0.737 0.270 0.467 0.321
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AS1746
Datasheet - O r d e r i n g I n f o r m a t i o n
11 Ordering Information
The device is available as the standard products shown in Table 4. Table 4. Ordering Information Ordering Code Marking AS1746-BTDR AS1746-BTDT AS1746-BWLT* ASK8 ASK8 ASK7 Description 0.5/0.6, Low-Voltage, Dual SPDT Analog Switch 0.5/0.6, Low-Voltage, Dual SPDT Analog Switch 0.5/0.6, Low-Voltage, Dual SPDT Analog Switch Delivery Form Tray Tape and Reel Tape and Reel Package TDFN-10 (3x3mm) TDFN-10 (3x3mm) WL-CSP-10
* Available on request.
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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AS1746
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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