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

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

* 2-Wire Serial Interface.

* Single Supply Operation. The ADG728 and ADG729 are

fully specified and guaranteed with 3 V and 5 V supply rails.

* Low On Resistance 2.5 Ω typical.

* Any configuration of switches may be on at any one time.

* Guaranteed Break-Before-Make Switching Action.

* Small 16-Lead TSSOP Package.

APPLICATIONS

* 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