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ADG508FBRWZ-REEL Datasheet(PDF) 1 Page - Analog Devices |
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ADG508FBRWZ-REEL Datasheet(HTML) 1 Page - Analog Devices |
1 / 20 page 8-Channel/4-Channel Fault-Protected Analog Multiplexers ADG508F/ADG509F Rev. F Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 ©2001–2011 Analog Devices, Inc. All rights reserved. FEATURES All switches off with power supply off Analog output of on channel clamped within power supplies if an overvoltage occurs Latch-up proof construction Low on resistance (270 Ω typical) Fast switching times tON: 230 ns maximum tOFF: 130 ns maximum Low power dissipation (3.3 mW maximum) Fault and overvoltage protection (−40 V to +55 V) Break-before-make construction TTL and CMOS compatible inputs APPLICATIONS Existing multiplexer applications (both fault-protected and nonfault-protected) New designs requiring multiplexer functions GENERAL DESCRIPTION The ADG508F and ADG509F are CMOS analog multi- plexers, with the ADG508F comprising eight single channels and the ADG509F comprising four differential channels. These multiplexers provide fault protection. Using a series n-channel, p-channel, n-channel MOSFET structure, both device and signal source protection is provided in the event of an overvoltage or power loss. The multiplexer can withstand continuous overvolt- age inputs from −40 V to +55 V. During fault conditions with power supplies off, the multiplexer input (or output) appears as an open circuit and only a few nanoamperes of leakage current will flow. This protects not only the multiplexer and the circuitry driven by the multiplexer, but also protects the sensors or signal sources that drive the multiplexer. The ADG508F switches one of eight inputs to a common output as determined by the 3-bit binary address lines A0, A1, and A2. The ADG509F switches one of four differential inputs to a common differential output as determined by the 2-bit binary address lines A0 and A1. An EN input on each device is used to enable or disable the device. When disabled, all channels are switched off. FUNCTIONAL BLOCK DIAGRAMS S1 S8 A0 D ADG508F A1 A2 EN 1 OF 8 DECODER Figure 1. S1A A0 DA ADG509F A1 S4A S1B S4B DB EN 1 OF 4 DECODER Figure 2. PRODUCT HIGHLIGHTS 1. Fault protection. The ADG508F/ADG509F can withstand continuous voltage inputs from −40 V to +55 V. When a fault occurs due to the power supplies being turned off, all the channels are turned off and only a leakage current of a few nanoamperes flows. 2. On channel saturates while fault exists. 3. Low RON. 4. Fast switching times. 5. Break-before-make switching. Switches are guaranteed break-before-make so that input signals are protected against momentary shorting. 6. Trench isolation eliminates latch-up. A dielectric trench separates the p and n-channel MOSFETs thereby preventing latch-up. |
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