High Performance 4/8 Channel Fault-Protected Analog Multiplexers
Description
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High Performance 4/8 Channel Fault-Protected Analog Multiplexers ADG438F/ADG439F*
FUNCTIONAL BLOCK DIAGRAMS
ADG438F
S1 S1A DA S4A D S1B DB S8 1 OF 8 DECODER S4B 1 OF 4 DECODER
FEATURES Fast Switching Times tON 250 ns max tOFF 150 ns max Fault and Overvoltage Protection (–40 V, +55 V) All Switches OFF with Power Supply OFF Analog Output of ON Channel Clamped Within Power Supplies If an Overvoltage Occurs Latch-Up Proof Construction Break Before Make Construction TTL and CMOS Compatible Inputs APPLICATIONS Data Acquisition Systems Industrial and Process Control Systems Avionics Test Equipment Signal Routing Between Systems High Reliability Control Systems
ADG439F
A0 A1 A2 EN
A0 A1 EN
GENERAL DESCRIPTION
PRODUCT HIGHLIGHTS
The ADG438F/ADG439F are CMOS analog multiplexers, the ADG438F comprising 8 single channels and the ADG439F comprising four differential channels.
These multiplexers provide fault protection.
Using a series n-channel, p-channel, nchannel MOSFET structure, both device and signal source protection is provided in the event of an overvoltage or power loss.
The multiplexer can withstand continuous overvoltage inputs from –40 V to +55 V.
During fault conditions, the multiplexer input (or output) appears as an open circuit and only a few nanoamperes of leakage current will flow.
This protects not only the multiplexer and the circuitry driven by the multiplexer, but also protects the sensors or signal sources which drive the multiplexer.
The ADG438F switches one of eight inputs to a common output as determined by the 3-bit binary address lines A0, A1 and A2.
The ADG439F switches one of four differential inputs to a common differential output as determined by the 2-bit binary address lines A0 and A1.
An EN input on each device is used to enable or disable the device.
When disabled, all channels are switched OFF.
1.
Fault Protection.
The ADG438F/ADG439F can withstand continuous voltage inputs up to –40 V or +55 V.
When a fault occurs due to the power...
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