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ADG728:  CMOS, Low Voltage, 2 Wire, Serially Controlled Single 8 to 1 Matrix Switch

Product Details

The ADG728 is a CMOS analog matrix switch with a serially controlled 2-wire interface. It is an 8-channel matrix switch. On resistance is closely matched between switches and very flat over the full signal range. This part can operate equally well as a multiplexer, demultiplexer or switch array and the input signal range extends to the supplies.

The ADG728 and ADG729 utilize a 2-wire serial interface that is compatible with the I2C™ interface standard. Both have two external address pins (A0 and A1). This allows the 2 LSBs of the 7-bit slave address to be set by the user. Four of each of the devices can be connected to the one bus. The ADG728 also has a RESET pin that should be tied high if not in use.

Each channel is controlled by one bit of an 8-bit word. This means that these devices may be used in a number of different configurations; all, any, or none of the channels may be on at any one time.

On power-up of the device, all switches will be in the OFF condition and the internal shift register will contain all zeros.

All channels exhibit break-before-make switching action preventing momentary shorting when switching channels.

The ADG728 and ADG729 are available in 16-lead TSSOP packages.

Product Highlights
  1. 2-Wire Serial Interface.
  2. Single Supply Operation. The ADG728 and ADG729 are fully specified and guaranteed with 3 V and 5 V supply rails.
  3. Low On Resistance 2.5 Ω typical.
  4. Any configuration of switches may be on at any one time.
  5. Guaranteed Break-Before-Make Switching Action.
  6. Small 16-Lead TSSOP Package.


  • Data Acquisition Systems
  • Communications Systems
  • Relay Placement
  • Audio and Video Switching
  • Automatic Test Equipment


  • 2-Wire Serial Interface
  • 2.7 V to 5.5 V Single Supply
  • 2.5 Ω On Resistance
  • 0.75 Ω On-Resistance Flatness
  • 100 pA Leakage Currents
  • Single 8-to-1 Matrix Switch
  • Power-On Reset
  • Small 16-Lead TSSOP Package
  • Qualified for Automotive Applications

Functional Block Diagram for ADG728


Title Content Type File Type
ADG728/ADG729: CMOS, Low Voltage, 2-Wire Serially Controlled, Matrix Switches Datasheet  (Rev C, 06/2012) (pdf, 151 kB) Data Sheets PDF
AN-1024: How to Calculate the Settling Time and Sampling Rate of a Multiplexer  (pdf, 210 kB) Application Notes PDF
Data-acquisition system uses fault protection
By Catherine Redmond, Analog Devices, Inc. (EDN, 4/15/2004)
Technical Articles HTML
CMOS Switches Offer High Performance in Low Power, Wideband Applications  (pdf, 320 kB)
by Theresa Corrigan and Ray Goggin, Analog Devices, Inc. (High Frequency Electronics, February 2004)
Technical Articles PDF
Temperature monitor measures three thermal zones
by Susan Pratt, Analog Devices, Inc. (EDN, 12/11/03)
Technical Articles HTML
Enhanced Multiplexing for MEMS Optical Cross Connects
by James Caffrey (Fiberoptic Product News, 8/2003)
Technical Articles HTML
Switches and Multiplexers Product Selection Guide  (pdf, 1462 kB) Product Selection Guide PDF
Switch Parametric Search Product Selection Guide HTML
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

Evaluation Kits & Symbols & Footprints

Symbols and Footprints— Analog Devices offers Symbols & Footprints which are compatible with a large set of today’s CAD systems for broader and easier support.

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Price, packaging, availability

ADG728 Model Options
Model Package Pins Temp.
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
ADG728BRU Status: Production 16 ld TSSOP 16 Ind Tube, 96 $2.29 $1.87 N  Material Info PCN Purchase
ADG728BRU-REEL Status: Last Time Buy 16 ld TSSOP 16 Ind Reel, 2500 - $1.87 N  Material Info PCN/PDN Purchase
ADG728BRU-REEL7 Status: Last Time Buy 16 ld TSSOP 16 Ind Reel, 1000 - $1.87 N  Material Info PCN/PDN Purchase
ADG728BRUZ Status: Production 16 ld TSSOP 16 Ind Tube, 96 $1.97 $1.62 Y  Material Info PCN Purchase Sample
ADG728BRUZ-REEL7 Status: Production 16 ld TSSOP 16 Ind Reel, 1000 - $1.62 Y  Material Info PCN Purchase
ADG728WBRUZ-REEL7 Status: Production TSSOP 4.4 MM 16 Ind Reel, 1000 - $1.86 Y  Material Info Notify Me Purchase
ADG878BRUZ Status: Pre-Release 20 ld TSSOP 16 Ind Tube, 96 - - Y  Material Info PDN Purchase
Price Table Help

The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

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