a
16-/32-Channel, Serially Controlled 4 ⍀
1.8 V to 5.5 V, ؎2.5 V, Analog Multiplexers
ADG725/ADG731
FEATURES
3-Wire SPI Compatible Serial Interface
1.8 V to 5.5 V Single Supply
؎2.5 V Dual-Supply Operation
4 ⍀ On Resistance
0.5 ⍀ On Resistance Flatness
7 mm x 7 mm 48-Lead Chip Scale Package (LFCSP)
or 48-Lead TQFP Package
Rail-to-Rail Operation
Power-On Reset
42 ns Switching Times
Single 32-to-1 Channel Multiplexer
Dual/Differential 16-to-1 Channel Multiplexer
TTL/CMOS Compatible Inputs
For Functionally Equivalent Devices with Parallel
Interface, See ADG726/ADG732
FUNCTIONAL BLOCK DIAGRAM
ADG731
ADG725
S1
S1A
DA
S16A
D
S1B
DB
S32
S16B
INPUT SHIFT
REGISTER
SCLK DIN SYNC
INPUT SHIFT
REGISTER
SCLK DIN SYNC
APPLICATIONS
Optical Applications
Data Acquisition Systems
Communication Systems
Relay Replacement
Audio and Video Switching
Battery-Powered Systems
Medical Instrumentation
Automatic Test Equipment
GENERAL DESCRIPTION
The ADG731/ADG725 are monolithic, CMOS, 32-channel/
dual 16-channel analog multiplexers with a serially controlled
3-wire interface. The ADG731 switches one of 32 inputs
(S1–S32) to a common output, D. The ADG725 can be configured as a dual mux switching one of 16 inputs to one output, or a
differential mux switching one of 16 inputs to a differential output.
These mulitplexers utilize a 3-wire serial interface that is compatible with SPI®, QSPI™, MICROWIRE™, and some DSP
interface standards. On power-up, the Internal Shift Register
contains all zeros and all switches are in the OFF state.
These multiplexers are designed on an enhanced submicron
process that provides low power dissipation yet gives high switching speed with very low on resistance and leakage currents.
They operate from a single supply of 1.8 V to 5.5 V or a
± 2.5 V dual supply, making them ideally suited to a variety of
applications. On resistance is in the region of a few ohms, is
closely matched between switches, and is very flat over the full
signal range.
Rev. B
These parts can operate equally well as either multiplexers or
demultiplexers and have an input signal range that extends to the
supplies. In the OFF condition, signal levels up to the supplies
are blocked. All channels exhibit break-before-make switching
action, preventing momentary shorting when switching channels.
The ADG731 and ADG725 are serially controlled 32-channel,
and dual/differential 16-channel multiplexers, respectively. They
are available in either a 48-lead LFCSP or TQFP package.
PRODUCT HIGHLIGHTS
1.
3-Wire Serial Interface.
2.
1.8 V to 5.5 V Single-Supply or ± 2.5 V Dual-Supply
Operation. These parts are specified and guaranteed
with 5 V ± 10%, 3 V ± 10% single-supply,
and ± 2.5 V ± 10% dual-supply rails.
3.
On Resistance of 4 W.
4.
Guaranteed Break-Before-Make Switching Action.
5.
7 mm ¥ 7 mm 48-Lead Chip Scale Package (LFCSP) or
48-Lead TQFP Package.
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