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PDF ADG438 Data sheet ( Hoja de datos )
| Número de pieza | ADG438 | |
| Descripción | High Performance 4/8 Channel Fault-Protected Analog Multiplexers | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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a
High Performance 4/8 Channel
Fault-Protected Analog Multiplexers
ADG438F/ADG439F*
FEATURES
Fast Switching Times
tON 250 ns max
tOFF 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
FUNCTIONAL BLOCK DIAGRAMS
ADG438F
S1
D
S8
1 OF 8
DECODER
ADG439F
S1A
S4A
DA
S1B
S4B
1 OF 4
DECODER
DB
A0 A1 A2 EN
A0 A1 EN
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 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- 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.
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.
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
1 page  
2000
1750
1500
VDD = +15V
VSS = –15V
1250
1000
750
500
250
0
–15
–10
+85؇C
+105؇C
–5 0
5
VD (VS) – Volts
+25؇C
10 15
Figure 4. On Resistance as a Function of VD (VS) for
Different Temperatures
1m
100
10
VDD = +15V
VSS = –15V
VD = 0V
1
100n
10n
OPERATING RANGE
1n
100p
10p
1p
–50 –40 –30 –20 –10 0 10 20 30 40 50 60
VS – INPUT VOLTAGE – Volts
Figure 5. Input Leakage Current as a Function of VS
(Power Supplies ON) During Overvoltage Conditions
0.3
VDD = +15V
0.2 VSS = –15V
TA = +25؇C
0.1
0.0
–0.1
IS (OFF)
ID (OFF)
ID (ON)
–0.2
–14
–10
–6 –2
2
6
VS, VD – Volts
10 14
Figure 6. Leakage Currents as a Function of VD (VS)
ADG438F/ADG439F
100
VDD = +15V
10
VSS = –15V
VD = +10V
VS = –10V
1
0.1
ID (OFF)
IS (OFF)
ID (ON)
0.01
25 35 45 55 65 75 85 95 105
TEMPERATURE – ؇C
Figure 7. Leakage Currents as a Function of Temperature
260
VIN = +2V
240
220
tON (EN)
200
180
160 tTRANSITION
140
tOFF (EN)
120
100
10 11 12 13 14 15
VSUPPLY – Volts
Figure 8. Switching Time vs. Power Supply
280
260
VDD = +15V
VSS = –15V
240 VIN = +5V
220
tON (EN)
200
tTRANSITION
180
160
140
120
100
25
tOFF (EN)
45 65 85
TEMPERATURE – ؇C
105
Figure 9. Switching Time vs. Temperature
REV. D
–5–
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet ADG438.PDF ] | |
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