CMOS, Low Voltage, 3-Wire Serially-Controlled, Matrix Switches Data Sheet ADG738/ADG739 FEATURES FUNCTIONAL BLOCK DIAGRAMS 3-wire serial interface ADG738 2.7 V to 5.5 V single supply S1 2.5 on resistance 0.75 on-resistance flatness 100 pA leakage currents D Single 8-to-1 multiplexer ADG738 Dual 4-to-1 multiplexer ADG739 Power-on reset S8 TTL/CMOS-compatible Qualified for automotive applications INPUT SHIFT DOUT REGISTER APPLICATIONS Data acquisition systems SCLK DIN SYNC RESET Communication systems Figure 1. Relay replacement Audio and video switching ADG739 S1A DA S4A S1B DB S4B INPUT SHIFT DOUT REGISTER GENERAL DESCRIPTION The ADG738 and ADG739 are CMOS analog matrix switches SCLK DIN SYNC with a serially-controlled 3-wire interface. The ADG738 is an 8-channel matrix switch, while the ADG739 is a dual 4-channel Figure 2. matrix switch. On resistance is closely matched between switches and very flat over the full signal range. The ADG738 and ADG739 utilize a 3-wire serial interface All channels exhibit break-before-make switching action, that is compatible with SPI, QSPI, MICROWIRE, and some preventing momentary shorting when switching channels. DSP interface standards. The output of the input shift register, The ADG738 and ADG739 are available in 16-lead TSSOP DOUT, enables a number of these parts to be daisy-chained. packages. On power-up, the internal input shift register contains all zeros PRODUCT HIGHLIGHTS and all switches are in the off state. 1. 3-Wire Serial Interface. Each switch conducts equally well in both directions when on, 2. Single Supply Operation. The ADG738/ADG739 are fully making these parts suitable for both multiplexing and demulti- specified and guaranteed with 3 V and 5 V supply rails. plexing applications. As each switch is turned on or off by a 3. Low On Resistance, 2.5 typical. separate bit, these parts can also be configured as a type of 4. Any configuration of switches may be on or off at any switch array, where any, all, or none of the eight switches may one time. be closed at any time. The input signal range extends to the 5. Guaranteed Break-Before-Make Switching Action. supply rails. 6. Small 16-lead TSSOP Package. Rev. A Document Feedback 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 20002012 Analog Devices, Inc. All rights reserved. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. Technical Support www.analog.com 10758-001 10758-002ADG738/ADG739 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Theory of Operation ...................................................................... 15 Applications ....................................................................................... 1 Power-On Reset .......................................................................... 15 General Description ......................................................................... 1 Serial Interface ............................................................................ 15 Functional Block Diagrams ............................................................. 1 Microprocessor Interfacing ....................................................... 15 Product Highlights ........................................................................... 1 ADSP-21xx to ADG738/ADG739 ........................................... 15 Revision History ............................................................................... 2 8051 Interface to ADG738/ADG739 ....................................... 16 Specifications ..................................................................................... 3 MC68HC11 Interface to ADG738/ADG739 .......................... 16 Timing Characteristics ................................................................ 5 Applications Information .............................................................. 17 Absolute Maximum Ratings ............................................................ 6 Expand the Number of Selectable Serial Devices Using an ADG739 ....................................................................................... 17 ESD Caution .................................................................................. 6 Daisy-Chaining Multiple ADG738s ........................................ 17 Pin Configurations and Function Descriptions ........................... 7 Outline Dimensions ....................................................................... 18 Typical Performance Characteristics ............................................. 9 Ordering Guide .......................................................................... 18 Test Circuits ..................................................................................... 12 Automotive Products ................................................................. 18 Terminology .................................................................................... 14 REVISION HISTORY 11/12Rev. 0 to Rev. A Updated Format .................................................................. Universal Changes to Features Section............................................................ 1 Added W Version Specifications to Table 1 .................................. 3 Added W Version Specifications to Table 2 .................................. 4 Changes to Table 4 ............................................................................ 6 Changes to Figure 7, Figure 8, and Figure 11 ............................... 9 Changes to Figure 12 ...................................................................... 10 Deleted Figure 22 ............................................................................ 12 Updated Outline Dimensions ....................................................... 19 Changes to Ordering Guide .......................................................... 19 4/00Revision 0: Initial Version Rev. A Page 2 of 20