ADG738 Datasheet, PDF (1/12 Pages) Analog Devices – CMOS, Low-Voltage, 3-Wire Serially-Controlled, Matrix Switches

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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
ADG739
S1
S1A
DA
S4A
D
S1B
DB
S8
S4B
INPUT SHIFT
REGISTER
DOUT
INPUT SHIFT
REGISTER
DOUT
SCLK DIN SYNC RESET
SCLK DIN SYNC
GENERAL DESCRIPTION
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 demulti-
plexing 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.
PRODUCT HIGHLIGHTS
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 switches may be on or off at any one time.
5. Guaranteed Break-Before-Make Switching Action.
6. Small 16-lead TSSOP Package.
SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corporation.
REV. 0
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