REV. D
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.
a
ADG438F/ADG439F*
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
Analog Devices, Inc., 2000
High Performance 4/8 Channel
Fault-Protected Analog Multiplexers
FUNCTIONAL BLOCK DIAGRAMS
S1
S8
A0
D
A1 A2 EN
ADG438F
1 OF 8
DECODER
A0
ADG439F
A1 EN
S1A
DA
S4A
S1B
S4B
DB
1 OF 4
DECODER
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
APPLICATIONS
Data Acquisition Systems
Industrial and Process Control Systems
Avionics Test Equipment
Signal Routing Between Systems
High Reliability Control Systems
GENERAL DESCRIPTION
The ADG438F/ADG439F are CMOS analog multiplexers, the
ADG438F comprising 8 single channels and the ADG439F
comprising four differential channels. These multiplexers pro-
vide 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 multi-
plexer 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 out-
put 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.
PRODUCT HIGHLIGHTS
1. Fault Protection.
The ADG438F/ADG439F can withstand continuous volt-
age inputs up to 40 V or +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 nano-
amperes flows.
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.
7. Improved OFF Isolation.
Trench isolation enhances the channel-to-channel isolation
of the ADG438F/ADG439F.
*Patent Pending.
2
REV. D
ADG438F/ADG439FSPECIFICATIONS
1
Dual Supply
B Version
40 C to
40 C to
Parameter
+25 C
+85 C
+105 C
Units
Test Conditions/Comments
ANALOG SWITCH
Analog Signal Range
V
SS
+ 1.2
V
SS
+ 1.2
V min
V
DD
0.8
V
DD
0.8
V max
R
ON
400
400
max
10 V < V
S
< +10 V, I
S
= 1 mA;
R
ON
5
5
% max
5 V < V
S
< +5 V, I
S
= 1 mA;
R
ON
Drift
0.6
%/
C typ
V
S
= 0 V, I
S
= 1 mA
R
ON
Match
3
3
3
% max
V
S
=
10 V, I
S
= 1 mA
LEAKAGE CURRENTS
Source OFF Leakage I
S
(OFF)
0.01
nA typ
V
D
=
10 V, V
S
= 10 V;
0.5
2
5
nA max
Test Circuit 2
Drain OFF Leakage I
D
(OFF)
0.01
nA typ
V
D
=
10 V, V
S
= 10 V;
ADG438F
0.5
5
30
nA max
Test Circuit 3
ADG439F
0.5
5
15
nA max
Channel ON Leakage I
D
, I
S
(ON)
0.01
nA typ
V
S
= V
D
=
10 V;
ADG438F
0.5
5
30
nA max
Test Circuit 4
ADG439F
0.5
5
15
nA max
FAULT
Output Leakage Current
0.02
nA typ
V
S
= 33 V, +33 V or +50 V, V
D
= 0 V, Test Circuit 3
(With Overvoltage)
0.1
2
10
A max
Input Leakage Current
0.005
A typ
V
S
=
25 V, V
D
= 10 V, Test Circuit 5
(With Overvoltage)
0.1
1
2
A max
Input Leakage Current
0.001
A typ
V
S
=
25 V, V
D
= V
EN
= A0, A1, A2 = 0 V
(With Power Supplies OFF)
0.1
1
4
A max
Test Circuit 6
DIGITAL INPUTS
Input High Voltage, V
INH
2.4
2.4
V min
Input Low Voltage, V
INL
0.8
0.8
V max
Input Current
I
INL
or I
INH
1
1
A max
V
IN
= 0 or V
DD
C
IN
, Digital Input Capacitance
5
pF typ
DYNAMIC CHARACTERISTICS
2
t
TRANSITION
170
ns typ
R
L
= 1 M
, C
L
= 35 pF;
220
300
320
ns max
V
S1
=
10 V, V
S8
= 10 V; Test Circuit 7
t
OPEN
10
10
10
ns min
R
L
= 1 k
, C
L
= 35 pF;
V
S
= +5 V; Test Circuit 8
t
ON
(EN)
200
ns typ
R
L
= 1 k
, C
L
= 35 pF;
250
300
300
ns max
V
S
= +5 V; Test Circuit 9
t
OFF
(EN)
110
ns typ
R
L
= 1 k
, C
L
= 35 pF;
150
180
180
ns max
V
S
= +5 V; Test Circuit 9
t
SETT
, Settling Time
0.1%
0.5
0.5
s typ
R
L
= 1 k
, C
L
= 35 pF;
0.01%
1.7
1.7
s typ
V
S
= +5 V
Charge Injection
4
pC typ
V
S
= 0 V, R
S
= 0
, C
L
= 1 nF; Test Circuit 10
OFF Isolation
80
dB typ
R
L
= 1 k
, C
L
= 15 pF, f = 100 kHz;
V
S
= 7 V rms; Test Circuit 11
Channel-to-Channel Crosstalk
85
dB typ
R
L
= 1 k
, C
L
= 15 pF, f = 100 kHz;
V
S
= 7 V rms; Test Circuit 12
C
S
(OFF)
5
pF typ
C
D
(OFF)
ADG438F
50
pF typ
ADG439F
25
pF typ
POWER REQUIREMENTS
I
DD
0.05
mA typ
V
IN
= 0 V or 5 V
0.15
0.25
0.25
mA max
I
SS
0.01
mA typ
0.02
0.04
0.04
mA max
NOTES
1
Temperature range is as follows: B Version: 40
C to +105
C.
2
Guaranteed by design, not subject to production test.
Specifications subject to change without notice.
(V
DD
= +15 V, V
SS
= 15 V, GND = 0 V, unless otherwise noted)
ADG438F/ADG439F
3
REV. D
ABSOLUTE MAXIMUM RATINGS*
(T
A
= +25
C unless otherwise noted)
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
*Stresses above those listed under Absolute Maximum Ratings may cause perma-
nent damage to the device. This is a stress rating only; functional operation of the
device at these or any other conditions above those listed in the operational
sections of this specification is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect device reliability. Only one absolute
maximum rating may be applied at any one time.
Table I. ADG438F Truth Table
A2
A1
A0
EN
ON SWITCH
X
X
X
0
NONE
0
0
0
1
1
0
0
1
1
2
0
1
0
1
3
0
1
1
1
4
1
0
0
1
5
1
0
1
1
6
1
1
0
1
7
1
1
1
1
8
X = Don't Care
Table II. ADG439F Truth Table
A1
A0
EN
ON SWITCH PAIR
X
X
0
NONE
0
0
1
1
0
1
1
2
1
0
1
3
1
1
1
4
X = Don't Care
ADG438F/ADG439F PIN CONFIGURATIONS
DIP/SOIC DIP/SOIC
A0
EN
A1
A2
S2
S3
S4
S5
S6
S7
S1
GND
V
DD
D
S8
1
2
16
15
5
6
7
12
11
10
3
4
14
13
8
9
TOP VIEW
(Not to Scale)
ADG438F
V
SS
A0
EN
A1
GND
S2A
S3A
S4A
S2B
S3B
S4B
V
SS
S1A
V
DD
S1B
DA
DB
1
2
16
15
5
6
7
12
11
10
3
4
14
13
8
9
TOP VIEW
(Not to Scale)
ADG439F
CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection.
Although the ADG438F/ADG439F features proprietary ESD protection circuitry, permanent
damage may occur on devices subjected to high energy electrostatic dischar ges. Therefore, proper
ESD precautions are recommended to avoid performance degradation or loss of functionality.
ORDERING GUIDE
Model
Temperature Range
Package Option*
ADG438FBN
40
C to +105
C
N-16
ADG438FBR
40
C to +105
C
R-16N
ADG439FBN
40
C to +105
C
N-16
ADG439FBR
40
C to +105
C
R-16N
ADG439FBRW
40
C to +105
C
R-16W
*N = Plastic DIP; R-16N = 0.15" Small Outline IC (SOIC); R-16W = 0.3"
Small Outline IC (SOIC).
WARNING!
ESD SENSITIVE DEVICE
ADG438F/ADG439F
4
REV. D
TERMINOLOGY
V
DD
Most positive power supply potential.
V
SS
Most negative power supply potential.
GND
Ground (0 V) reference.
R
ON
Ohmic resistance between D and S.
R
ON
R
ON
variation due to a change in the analog
input voltage with a constant load current.
R
ON
Drift
Change in R
ON
when temperature changes
by one degree Celsius.
R
ON
Match
Difference between the R
ON
of any two
channels.
I
S
(OFF)
Source leakage current when the switch is
off.
I
D
(OFF)
Drain leakage current when the switch is off.
I
D
, I
S
(ON)
Channel leakage current when the switch is
on.
V
D
(V
S
)
Analog voltage on terminals D, S.
C
S
(OFF)
Channel input capacitance for "OFF"
condition.
C
D
(OFF)
Channel output capacitance for "OFF"
condition.
C
D
, C
S
(ON)
"ON" switch capacitance.
C
IN
Digital input capacitance.
t
ON
(EN)
Delay time between the 50% and 90% points
of the digital input and switch "ON"
condition.
t
OFF
(EN)
Delay time between the 50% and 90% points
of the digital input and switch "OFF"
condition.
t
TRANSITION
Delay time between the 50% and 90% points
of the digital inputs and the switch "ON"
condition when switching from one address
state to another.
t
OPEN
"OFF" time measured between 80% points of
both switches when switching from one
address state to another.
V
INL
Maximum input voltage for Logic "0".
V
INH
Minimum input voltage for Logic "1".
I
INL
(I
INH
)
Input current of the digital input.
Off Isolation
A measure of unwanted signal coupling
through an "OFF" channel.
Charge Injection
A measure of the glitch impulse transferred
from the digital input to the analog output
during switching.
I
DD
Positive supply current.
I
SS
Negative supply current.
Typical Performance Graphs
2000
1000
0
15
5
15
5
0
10
10
500
1750
1500
1250
750
250
V
D
(V
S
) Volts
R
ON
T
A
= +25 C
V
DD
= +5V
V
SS
= 5V
V
DD
= +10V
V
SS
= 10V
V
DD
= +15V
V
SS
= 15V
Figure 1. On Resistance as a Function of V
D
(V
S
)
1m
1
1p
50
30
50
10
20
20
40
1n
30
40
100
10
10n
100n
10p
100p
10
0
V
IN
INPUT VOLTAGE Volts
I
S
INPUT LEAKAGE A
OPERATING RANGE
V
DD
= 0V
V
SS
= 0V
V
D
= 0V
60
Figure 2. Input Leakage Current as a Function of V
S
(Power Supplies OFF) During Overvoltage Conditions
1m
1
1p
50
30
50
10
20
20
40
1n
30
40
100
10
10n
100n
10p
100p
10
0
V
IN
INPUT VOLTAGE Volts
I
D
OUTPUT LEAKAGE A
OPERATING RANGE
V
DD
= +15V
V
SS
= 15V
V
D
= 0V
60
Figure 3. Output Leakage Current as a Function of V
S
(Power Supplies ON) During Overvoltage Conditions
ADG438F/ADG439F
5
REV. D
100
10
0.01
25
45
65
55
75
35
85
95
105
1
0.1
TEMPERATURE C
LEAKAGE CURRENTS nA
I
S
(OFF)
I
D
(OFF)
I
D
(ON)
V
DD
= +15V
V
SS
= 15V
V
D
= +10V
V
S
= 10V
Figure 7. Leakage Currents as a Function of Temperature
260
240
100
10
15
12
13
11
120
14
t
ON
(EN)
V
IN
= +2V
220
200
180
160
140
t
ns
V
SUPPLY
Volts
t
OFF
(EN)
t
TRANSITION
Figure 8. Switching Time vs. Power Supply
280
240
100
25
105
65
85
45
120
t
ON
(EN)
220
200
180
160
140
t
ns
TEMPERATURE C
t
OFF
(EN)
t
TRANSITION
260
V
DD
= +15V
V
SS
= 15V
V
IN
= +5V
Figure 9. Switching Time vs. Temperature
2000
1000
0
15
5
15
5
0
10
10
500
1750
1500
1250
750
250
V
D
(V
S
) Volts
R
ON
+25 C
V
DD
= +15V
V
SS
= 15V
+105 C
+85 C
Figure 4. On Resistance as a Function of V
D
(V
S
) for
Different Temperatures
1m
1
1p
50
30
60
10
20
20
40
30
40
10
0
50
1n
100
10
10n
100n
10p
100p
V
S
INPUT VOLTAGE Volts
I
S
INPUT LEAKAGE A
OPERATING RANGE
V
DD
= +15V
V
SS
= 15V
V
D
= 0V
Figure 5. Input Leakage Current as a Function of V
S
(Power Supplies ON) During Overvoltage Conditions
0.3
0.2
0.2
14
6
14
2
2
6
10
0.1
10
0.0
0.1
V
S
, V
D
Volts
LEAKAGE CURRENTS nA
I
S
(OFF)
I
D
(OFF)
I
D
(ON)
V
DD
= +15V
V
SS
= 15V
T
A
= +25 C
Figure 6. Leakage Currents as a Function of V
D
(V
S
)
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