ADG739

a FEATURES 3-Wire Serial Interface 2.7 V to 5.5 V Single Supply 2.5 ⍀ On Resistance 0.75 ⍀ On-Resistance Flatness 100 pA Leakage Currents Single 8-to-1 Multiplexer ADG738 Dual 4-to-1 Multiplexer ADG739 Power-On Reset TTL/CMOS-Compatible APPLICATIONS Data Acquisition Systems Communication Systems Relay Replacement Audio and Video Switching CMOS, Low-Voltage, 3-Wire Serially-Controlled, Matrix Switches ADG738/ADG739 FUNCTIONAL BLOCK DIAGRAMS ADG738 S1 S1A DA S4A D S1B DB S8 INPUT SHIFT REGISTER S4B DOUT INPUT SHIFT REGISTER DOUT ADG739 SCLK DIN SYNC RESET SCLK DIN SYNC GENERAL DESCRIPTION PRODUCT HIGHLIGHTS The ADG738 and ADG739 are CMOS analog matrix switches with a serially-controlled 3-wire interface. The ADG738 is an 8-channel matrix switch, while the ADG739 is a dual 4-channel 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 that is compatible with SPI™, QSPI™, MICROWIRE™, and some DSP interface standards. The output of the shift register DOUT enables a number of these parts to be daisy-chained. On power-up, the internal shift register contains all zeros and all switches are in the OFF state. Each switch conducts equally well in both directions when on, making these parts suitable for both multiplexing and demultiplexing applications. As each switch is turned on or off by a separate bit, these parts can also be configured as a type of switch array, where ...