ADG738_15 Datasheet, PDF (1/20 Pages) Analog Devices – Serially-Controlled, Matrix Switches

Data Sheet
FEATURES
3-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 multiplexer ADG738
Dual 4-to-1 multiplexer ADG739
Power-on reset
TTL/CMOS-compatible
Qualified for automotive applications
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
D
S8
INPUT SHIFT
REGISTER
DOUT
SCLK DIN SYNC RESET
Figure 1.
ADG739
S1A
DA
S4A
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 input shift register,
DOUT, enables a number of these parts to be daisy-chained.
On power-up, the internal input 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.
Rev. A
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S1B
DB
S4B
INPUT SHIFT
REGISTER
DOUT
SCLK DIN SYNC
Figure 2.
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/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.
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