ADG528FBNZ Datasheet, PDF (1/16 Pages) Analog Devices – 8-Channel Fault-Protected Analog Multiplexer

FEATURES
Low on resistance (300 Ω typical)
Fast switching times
tON: 250 ns maximum
tOFF: 250 ns maximum
Low power dissipation (3.3 mW maximum)
Fault and overvoltage protection (−40 V to +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
Existing multiplexer applications (both fault-protected and
nonfault-protected)
New designs requiring multiplexer functions
GENERAL DESCRIPTION
The ADG528F¹ is a CMOS analog multiplexer, with the
comprising eight single channels. This multiplexer provides
fault protection. Using a series n-channel, p-channel, n-channel
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 that drive the
multiplexer.
The ADG528F switches one of eight inputs to a common output
as determined by the 3-bit binary address lines A0, A1, and A2.
The ADG528F has on-chip address and control latches that
facilitate microprocessor interfacing. An EN input on the device
is used to enable or disable the device. When disabled, all channels
are switched off.
8-Channel Fault-Protected
Analog Multiplexer
ADG528F
FUNCTIONAL BLOCK DIAGRAM
ADG528F
S1
D
S8
WR
1 OF 8
RS
DECODER
A0 A1 A2 EN
Figure 1.
PRODUCT HIGHLIGHTS
1. Fault protection.
The ADG528F can withstand continuous voltage inputs
from −40 V to +55 V. When a fault occurs due to the
power supplies being turned off, all the channels are turned
off and only a leakage current of a few nanoamperes flows.
2. On channel turns off while fault exists.
3. Low RON.
4. Fast switching times.
5. Break-before-make switching.
Switches are guaranteed break-before-make so that input
signals are protected against momentary shorting.
6. Trench isolation eliminates latch-up.
A dielectric trench separates the p-channel and n-channel
MOSFETs thereby preventing latch-up.
Rev. F
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