Datasheet ADG438F, ADG439F (Analog Devices)

High Performance, 4-/8-Channel, Fault-Protected Analog Multiplexers ADG438F /ADG439F FEATURES FUNCTIONAL BLOCK DIAGRAM All switches off with power supply off ADG438F Analog output of on channel clamped within power supplies S1 if an overvoltage occurs Latch-up proof construction Fast switching times D tON 250 ns maximum tOFF 150 ns maximum Fault and overvoltage protection: −40 V to +55 V S8 Break-before-make construction TTL- and CMOS-compatible inputs 1 OF 8 DECODER
1 -00
APPLICATIONS
8
A0 A1 A2 EN
46 00
Data acquisition systems
Figure 1.
Industrial and process control systems ADG439F Avionics test equipment Signal routing between systems S1A DA High reliability control systems S4A GENERAL DESCRIPTION S1B
The ADG438F and ADG439F are CMOS analog multiplexers, with
DB
the ADG438F comprising eight single channels and the ADG439F
S4B
comprising four differential channels. These multiplexers provide
1 OF 4
fault protection. Using a series n-channel, p-channel, and
DECODER
n-channel MOSFET structure, both device and signal source -101 protection is provided in the event of an overvoltage or power 68
A0 A1 EN
004 loss. The multiplexer can withstand continuous overvoltage Figure 2. inputs from −40 V to +55 V. During fault conditions with power
PRODUCT HIGHLIGHTS
supplies off, the multiplexer input (or output) appears as an open 1. Fault Protection. The ADG438F and ADG439F can with- circuit and only a few nanoamperes of leakage current flows. This stand continuous voltage inputs up to −40 V or +55 V. protects not only the multiplexer and the circuitry driven by the When a fault occurs due to the power supplies being multiplexer, but also protects the sensors or signal sources which turned off, all the channels are turned off and only a drive the multiplexer. leakage current of a few nanoamperes flows. The ADG438F switches one of eight inputs to a common output 2. On channel saturates while fault exists. as determined by the 3-bit binary address lines, A0, A1, and A2. 3. Low RON. The ADG439F switches one of four differential inputs to a 4. Fast Switching Times. common differential output as determined by the 2-bit binary 5. Break-Before-Make Switching. Switches are guaranteed address lines, A0 and A1. An EN input on each device is used break-before-make so that input signals are protected to enable or disable the device. When disabled, all channels are against momentary shorting. switched off. 6. Trench Isolation Eliminates Latch-Up. A dielectric trench separates the p-channel and n-channel MOSFETs thereby preventing latch-up. 7. Improved Off Isolation. Trench isolation enhances the channel-to-channel isolation of the ADG438F/ADG439F.
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Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAM PRODUCT HIGHLIGHTS TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS DUAL SUPPLY ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS TEST CIRCUITS TERMINOLOGY THEORY OF OPERATION OUTLINE DIMENSIONS ORDERING GUIDE