AS1744 AMSCO
Document overview
- Manufacturer or author: Provided By digicamel.com
- PDF pages: 16
Technical content
1 General Description
single-pole/double-throw (SPDT) analog switches. cell battery powered applications. support break-before-make switching. Figure 1. Block Diagrams
2 Key Features
3 Applications
Switches shown for low input.
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 1. Absolute Maximum Ratings
5 Electrical Characteristics
Table 2. +5V 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.
- Between any two switches.
Table 3. +3V Supply Electrical Characteristics
6 Typical Operating Characteristics
Figure 2. Frequency Response Figure 3. THD vs. Frequency Figure 4. RON vs. VCOM and Temperature (VDD = 5V) Figure 5. R ON vs. VCOM and Temperature (VDD = 3V) Figure 6. RON vs. VCOM Figure 7. tON/tOFF vs. Temperature (V+ = 5V)
Figure 8. tON/tOFF vs. Supply Voltage Figure 9. Charge Injection
7 Detailed Description
CMOS process technology allows switching of analog signals that are within the supply voltage range (GND to V+). requirements of modern portable audio devices. Pins NOx, NCx, and COMx are bi-directional, thus they can be used as inputs or outputs. tance (see Typical Operating Characteristics on page 5). systems using a supply of less than 5V.
8 Application Information
analog range to a diode-drop (about 0.7V) below V+ (for D1), and a diode-drop above ground (for D2). Note: Operation beyond the absolute maximum ratings (see page 2) may permanently damage the devices. ON-resistance increases slightly at lower supply voltages. Figure 10. Overvoltage Protection Using 2 External Blocking Diodes and D2 also protect against overvoltage conditions. fault voltage up to the absolute maximum rating is applied to an analog signal pin, no damage will result. Note: The supply voltage (V+) must not exceed the absolute maximum rating of +7V. High-speed switches require proper layout and design procedures for optimum performance. ! Reduce stray inductance and capacitance by keeping traces short and wide. ! Ensure that bypass capacitors are as close to the device as possible. ! Use large ground planes where possible.
9 Pinout and Packaging
Figure 16. Pin Assignments (Top View) Table 4. Pin Descriptions
10 COM1
7 NC2
9 NC1
6 COM25IN2
7 NO2
9 NO1
The devices are available in a 10-pin MSOP package and a 10-pin TDFN package. Figure 17. 10-pin MSOP Package
AS1744, AS1745 austria micro systems Data Sheet Package Drawings and Markings www.austriamicrosystems.com Revision 1.53 12 - 16 Notes: 1. All dimensions are in millimeters, angles in degrees, unless otherwise specified. 2. Datums B and C to be determined at datum plane H. 3. Dimensions D and E1 are to be determined at datum plane H. 4. Dimensions D2 and E2 are for top package; dimensions D and E1 are for bottom package. 5. Cross section A-A to be determined at 0.13 to 0.25mm from lead tip. 6. Dimensions D and D2 do not include mold flash, protrusion, or gate burrs. 7. Dimensions E1 and E2 do not include interlead flash or protrusion.
Figure 18. 10-pin TDFN Package (3.0x3.0mm)
AS1744, AS1745 austria micro systems Data Sheet Package Drawings and Markings www.austriamicrosystems.com Revision 1.53 14 - 16 Notes: 1. Dimensioning and tolerancing are compliant with ASME Y14.5M-1994. 2. Dimensions are in millimeters, angles in degrees (º). 3. N is the total number of terminals. 4. The terminal 1 identifier and terminal numbering convention shall conform to JESD 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, embedded metal or mark feature. 5. Dimension b applies to metallized terminal and is measured between 0.15 and 0.30mm from terminal tip. 6. ND refers to the maximum number of terminals on D side. 7. Variation shown in Figure 18 is for illustration purposes only. 8. For variation identifier dimension details, refer to the Dimensions table. 9. For a complete set of dimensions for each variation, refer to the Variations table. 10. Unilateral coplanarity zone applies to the exposed heat sink slug and the terminals. 11. For a rectangular package, the terminal side of the package is determined by: - Type 1: Terminals are on the short side of the package. - Type 2: Terminals are on the long side of the package. 12. Variations specified as NJR (non JEDEC registered), with an additional dash number (e.g., -1, -2) are pack- ages currently not registered with JEDEC. 13. When more than one variations exist for the same profile height, body size (DxE), and pitch, then those vari- ations will be denoted by an additional dash number (i.e., -1,-2) for identification. The new variations shall be created based on any or all of the following factors: terminal count, terminal length, and exposed pad sizes.
The devices are available as the standard products shown in Table 5. Available upon request. Contact austriamicrosystems, AG for details. Table 5. Ordering Information
AS1744, AS1745 austria micro systems Data Sheet www.austriamicrosystems.com Revision 1.53 16 - 16 Copyrights Copyright © 1997-2006, 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 For Sales Offices, Distributors and Representatives, please visit: http://www.austriamicrosystems.com austria micro systems a leap ahead