CMOS/ Low-Voltage/ 3-Wire Serially-Controlled/ Matrix Switches
Description
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 any, all, or none of the eight switches may be closed at any time.
The input signal range extends to the supply rails.
All channels exhibit break-before-make switching action, preventing momentary shorting when switching channels.
The ADG738 and ADG739 are available in 16-lead TSSOP packages.
1.
3-Wire Serial Interface.
2.
Single Supply Operation.
The ADG738 and ADG739 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 sw...
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