ADG438F

Features:

Fast Switching Times
  t_ON 250 ns max
  t_OFF 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


Application

Data Acquisition Systems
Industrial and Process Control Systems
Avionics Test Equipment
Signal Routing Between Systems
High Reliability Control Systems


Pinout




Specifications

V_DD to V_SS  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..+44 V
V_DD to GND  . . . . . . . . . . . . . . . . . . . . . . . . . . 0.3 V to +25 V
V_SS to GND . . . . . . . . . . . . . . . . . . . . . . . . . .. +0.3 V to 25 V
V_EN, V_A Digital Input  . . . . . . .  0.3 V to V_DD + 2 V or 20 mA,
Whichever Occurs First
V_S, Analog Input Overvoltage with Power ON . . . .V_SS 25 V
                                                                          to V_DD + 40 V
V_S, Analog Input Overvoltage with Power OFF
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40 V to +55 V
Continuous Current, S or D  . . . . . . . . . . . . . . . . . . . . .20 mA
Peak Current, S or D
(Pulsed at 1 ms, 10% Duty Cycle max)  . . . . . . . . . . .  40 mA
Operating Temperature Range
Industrial (B Version)  . . . . . . . . . . . . . . . . 40°C to +105°C
Storage Temperature Range  . . . . . . . . . . 65°C to +150°C
Junction Temperature  . . . . . . . . . . . . . . . . . . . . . . . +150°C
Plastic Package
_JA, Thermal Impedance  . . . . . . . . . . . . . . . . . . . .117°C/W
Lead Temperature, Soldering (10 sec)  . . . . . . . . .  +260°C
SOIC Package
_JA, Thermal Impedance
Narrow Body  . . . . . . . . . . . . . . . . . . . . . . . . . . .   125°C/W
Wide Body  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  90°C/W
Lead Temperature, Soldering
Vapor Phase (60 sec)  . . . . . . . . . . . . . . . . . . . . .  +215°C
Infrared (15 sec)  . . . . . . . . . . . . . . . . . . . . . . . . .  +220°C


Description

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/ADG439F  switch one of eight inputs to a common out-put as determined by the 3-bit binary address lines A0, A1 and A2. The ADG438F/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.