ADG508F Datasheet, PDF (1/12 Pages) Analog Devices – 4/8 Channel Fault-Protected Analog Multiplexers

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4/8 Channel Fault-Protected
Analog Multiplexers
ADG508F/ADG509F/ADG528F*
FEATURES
Low On Resistance (300 ⍀ typ)
Fast Switching Times
t_ON 250 ns max
t_OFF 250 ns max
Low Power Dissipation (3.3 mW max)
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 ADG508F, ADG509F and ADG528F are CMOS analog
multiplexers, the ADG508F and ADG528F comprising eight
single channels and the ADG509F comprising four differential
channels. These multiplexers provide 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 ADG508F and ADG528F switch one of eight inputs to a
common output as determined by the 3-bit binary address lines
A0, A1 and A2. The ADG509F switches one of four differential
inputs to a common differential output as determined by the 2-
bit binary address lines A0 and A1. The ADG528F has on-chip
address and control latches that facilitate microprocessor inter-
facing. An EN input on each device is used to enable or disable
the device. When disabled, all channels are switched OFF.
PRODUCT HIGHLIGHTS
1. Fault Protection.
The ADG508F/ADG509F/ADG528F can withstand con-
tinuous 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.
*Patent Pending.
REV. C
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
FUNCTIONAL BLOCK DIAGRAMS
ADG508F/ADG528F
ADG509F
S1
S1A
DA
S4A
D
S8
ADG528F ^WR
ONLY _RS
1 OF 8
DECODER
S1B
DB
S4B
1 OF 4
DECODER
A0 A1 A2 EN
A0 A1 EN
2. ON channel turns off while fault exists.
3. Low R_ON.
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 and n-channel MOSFETs
thereby preventing latch-up.
ORDERING GUIDE
Model¹
Temperature Range Package Option²
ADG508FBN
ADG508FBRN
ADG508FBRW
ADG508FTQ
ADG509FBN
ADG509FBRN
ADG509FBRW
ADG509FTQ
ADG528FBN
ADG528FBP
ADG528FTQ
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–55°C to +125°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–55°C to +125°C
–40°C to +85°C
–40°C to +85°C
–55°C to +125°C
N-16
R-16N
R-16W
Q-16
N-16
R-16N
R-16W
Q-16
N-18
P-20A
Q-18
NOTES
1_{To order MIL-STD-883, Class B processed parts, add /883B to T grade part}
numbers.
2_{N = Plastic DIP; P = Plastic Leaded Chip Carrier (PLCC); Q = Cerdip;}
RN = 0.15" Small Outline IC (SOIC), RW = 0.3" Small Outline IC (SOIC).
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© Analog Devices, Inc., 1998