High Performance, 4-/8-Channel, Fault-Protected Analog Multiplexers ADG438F/ADG439F FEATURES FUNCTIONAL BLOCK DIAGRAM All switches off with power supply off ADG438F Analog output of on channel clamped within power supplies S1 if an overvoltage occurs Latch-up proof construction Fast switching times D t 250 ns maximum ON t 150 ns maximum OFF Fault and overvoltage protection: 40 V to +55 V S8 Break-before-make construction 1 OF 8 TTL- and CMOS-compatible inputs DECODER APPLICATIONS A0 A1 A2 EN Data acquisition systems Figure 1. Industrial and process control systems ADG439F Avionics test equipment S1A Signal routing between systems DA High reliability control systems S4A GENERAL DESCRIPTION S1B The ADG438F and ADG439F are CMOS analog multiplexers, with DB S4B the ADG438F comprising eight single channels and the ADG439F comprising four differential channels. These multiplexers provide 1 OF 4 DECODER fault protection. Using a series n-channel, p-channel, and n-channel MOSFET structure, both device and signal source protection is provided in the event of an overvoltage or power A0 A1 EN loss. The multiplexer can withstand continuous overvoltage Figure 2. inputs from 40 V to +55 V. During fault conditions with power PRODUCT HIGHLIGHTS supplies off, the multiplexer input (or output) appears as an open 1. Fault Protection. The ADG438F and ADG439F can with- circuit and only a few nanoamperes of leakage current flows. This stand continuous voltage inputs up to 40 V or +55 V. protects not only the multiplexer and the circuitry driven by the When a fault occurs due to the power supplies being multiplexer, but also protects the sensors or signal sources which turned off, all the channels are turned off and only a drive the multiplexer. leakage current of a few nanoamperes flows. The ADG438F switches one of eight inputs to a common output 2. On channel saturates while fault exists. as determined by the 3-bit binary address lines, A0, A1, and A2. 3. Low RON. The ADG439F switches one of four differential inputs to a 4. Fast Switching Times. common differential output as determined by the 2-bit binary 5. Break-Before-Make Switching. Switches are guaranteed address lines, A0 and A1. An EN input on each device is used break-before-make so that input signals are protected to enable or disable the device. When disabled, all channels are against momentary shorting. switched off. 6. Trench Isolation Eliminates Latch-Up. A dielectric trench separates the p-channel and n-channel MOSFETs thereby preventing latch-up. 7. Improved Off Isolation. Trench isolation enhances the channel-to-channel isolation of the ADG438F/ADG439F. Rev. E Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 www.analog.com license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Fax: 781.461.3113 2011 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. 00468-001 00468-101ADG438F/ADG439F TABLE OF CONTENTS Features .............................................................................................. 1 ESD Caution...................................................................................5 Applications....................................................................................... 1 Pin Configuration and Function Descriptions..............................6 General Description ......................................................................... 1 Typical Performance Characteristics ..............................................7 Functional Block Diagram .............................................................. 1 Test Circuits........................................................................................9 Product Highlights ........................................................................... 1 Terminology.................................................................................... 12 Revision History ............................................................................... 2 Theory of Operation ...................................................................... 13 Specifications..................................................................................... 3 Outline Dimensions....................................................................... 14 Dual Supply ................................................................................... 3 Ordering Guide .......................................................................... 15 Absolute Maximum Ratings............................................................ 5 REVISION HISTORY 7/11Rev. D to Rev. E Updated Format..................................................................Universal Changes to Product Highlights Section and General Description ........................................................................................ 1 Changes to Specification Section and Table 1 .............................. 3 Changes to Table 2............................................................................ 5 Added Table 3 and Table 4 Renumbered Sequentially ............... 6 Changes to Figure 5 to Figure 10.................................................... 7 Changes to Figure 11 to Figure 13.................................................. 8 Added Figure 14 to Figure 16.......................................................... 8 Changes to Figure 18 to Figure 20, Figure 23, and Figure 24 ..... 9 Changes to Terminology Section.................................................. 12 Changes to Theory of Operation Section, Figure 29, and Figure 30 .......................................................................................... 13 Updated Outline Dimensions ....................................................... 14 Changes to Ordering Guide .......................................................... 15 2/00Rev. C to Rev. D Rev. E Page 2 of 16