AS1741 AMSCO
Document overview
- Manufacturer or author: Provided By digicamel.com
- PDF pages: 15
Technical content
1 General Description
cell battery powered applications. number of switches as listed in Table 1. The AS1743 supports break-before-make switching. all devices can handle Rail-to-Rail signals. Figure 1. MSOP Block Diagrams
2 Key Features
3 Applications
signal switching is required. Table 1. Standard Products
4 Absolute Maximum Ratings
† Signals on pins COM1, COM2, NO1, NO2, NC1, or NC2 that exceed V+ or GND are clamped by internal diodes. Limit forward-diode current to the maximum current rating. Table 2. Absolute Maximum Ratings
5 Electrical Characteristics
Table 3. Power Supply Characteristics Table 4. +3V Supply Electrical Characteristics
- ∆RON = RON(MAX) - RON(MIN).
- Flatness is defined as the difference between the maximum and the minimum value of ON-resistance as measured
over the specified analog signal ranges.
- Off-Isolation = 20log10(VCOMx/VNOx), VCOMx = output, VNOx = input to off switch.
Table 5. +1.8V Supply Electrical Characteristics Table 4. +3V Supply Electrical Characteristics (Continued)
6 Typical Operating Characteristics
Figure 2. Charge Injection vs. Output Voltage; SOT23 F igure 3. Charge Injection vs. Output Voltage; MSOP Figure 6. tON/tOFF vs. Supply Voltage Figure 7. t ON/tOFF vs. Temperature
Figure 8. THD vs. Frequency; RLOAD = 32Ω, VDD = 3V Figure 9. Frequency Response
7 Pinout
Figure 10. MSOP Pin Assignments (Top View) Figure 11. SOT23 Pin Assignments (Top View) Table 6. Pin Descriptions
5 NC2
6 COM2
7 IN1
5 NO2
8 NC1
5 GND
6 IN2
7 COM1
8 NO1
www.austriamicrosystems.com Revision 1.76 8 - 15 AS1741, AS1742, AS1743 austria micro systems Data Sheet ON Resistance
8 Detailed Description
The AS1741/AS1742/AS1743 are low ON-resistance, low-voltage, dual analog SPST switches that operate from a sin- gle +1.6 to +3.6V supply. CMOS process technology allows switching of analog signals that are within the supply voltage range (GND to V+). ON Resistance When powered from a +3V supply, the AS1741/AS1742/AS1743 low (0.8Ω, max) ON-resistance allows high-speed, continuous signals to be switched in a variety of applications. All devices have very low RON flatness (0.18Ω, max) so they can meet or exceed the low-distortion audio requirements of modern portable audio devices. Bi-Directional Switching Pins NOx, NCx, and COMx are bi-directional and can be used as inputs or outputs. Analog Signal Levels Analog signals ranging over the entire supply voltage range (V+ to GND) can be passed with very little change in ON- resistance (see Typical Operating Characteristics on page 5). Logic Inputs The AS1741/AS1742/AS1743 logic inputs can be driven up to +3.6V regardless of the supply voltage value. For exam- ple, with a +1.8V supply, INx may be driven low to GND and high to +3.6V. This allows the devices to interface with +3V systems using a supply of less than 3V.
9 Application Information
Note: Operation beyond the absolute maximum ratings (see page 2) may permanently damage the devices. A 0.1µF bypass capacitor, connected from V+ to GND (see Figure 17 on page 11), is adequate for most applications. Driving INx Rail-to-Rail will help minimize power consumption. High-speed switches require proper layout and design procedures for optimum performance. ! Short, wide traces should be used to reduce stray inductance and capacitance. ! Bypass capacitors should be as close to the device as possible. ! Large ground planes should be used wherever possible. Figure 12. AS1741/AS1743 Test Circuit and Timing Diagram Figure 13. AS1742/AS1743 Test Circuit and Timing Diagram
Figure 17. Off-Isolation, On-Loss, and Crosstalk
- Measurements are standardized against short-circuit at socket terminals.
- Off-isolation is measured between COMx and the off NCx/NOx terminal of each switch. Off-isolation = 20log(VOUT/VIN).
- Signal direction through the switch is reversed; worst values are recorded.
The devices are available in an 8-pin MSOP package and an 8-pin SOT23 package. Figure 18. 8-pin MSOP Package
- All dimensions are in millimeters, angles in degrees, unless otherwise specified.
- Datums B and C to be determined at datum plane H.
- Dimensions D and E1 are to be determined at datum plane H.
- Dimensions D2 and E2 are for top package; dimensions D and E1 are for bottom package.
- Cross section A-A to be determined at 0.13 to 0.25mm from lead tip.
- Dimensions D and D2 do not include mold flash, protrusion, or gate burrs.
- Dimensions E1 and E2 do not include interlead flash or protrusion.
Figure 19. 8-pin SOT23 Package
- All dimensions are in millimeters.
- Foot length measured at intercept point between datum A and
- Package outline exclusive of mold flash and metal burr.
- Package outline inclusive of solder plating.
- PKGST0005 (Rev B) refer to SOT23 8-lead SOT23-D-2019
The devices are available as the standard products shown in Table 7. Table 7. Ordering Information
www.austriamicrosystems.com Revision 1.76 15 - 15 AS1741, AS1742, AS1743 austria micro systems Data Sheet Copyrights Copyright © 1997-2005, austriamicrosystems AG, Schloss Premstaetten, 8141 Unterpremstaetten, Austria-Europe. Trademarks Registered ®. All rights reserved. The material herein may not be reproduced, adapted, merged, trans- lated, 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. austriami- crosystems 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 tech- nical 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 A-8141 Schloss Premstaetten, Austria Tel: +43 (0) 3136 500 0 Fax: +43 (0) 3136 525 01 e-mail: info@austriamicrosystems.com For Sales Offices, Distributors and Representatives, please visit: http://www.austriamicrosystems.com austria micro systems – a leap ahead