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PDF ADG428 Data sheet ( Hoja de datos )
| Número de pieza | ADG428 | |
| Descripción | LC2MOS Latchable 4-/8-Channel High Performance Analog Multiplexers | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de ADG428 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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a
LC2MOS Latchable 4-/8-Channel
High Performance Analog Multiplexers
FEATURES
44 V Supply Maximum Ratings
VSS to VDD Analog Signal Range
Low On Resistance (60 ⍀ typ)
Low Power Consumption (1.6 mW max)
Low Charge Injection (<4 pC typ)
Fast Switching
Break-Before-Make Switching Action
Plug-In Replacement for DG428/DG429
APPLICATIONS
Automatic Test Equipment
Data Acquisition Systems
Communication Systems
Avionics and Military Systems
Microprocessor Controlled Analog Systems
Medical Instrumentation
ADG428/ADG429
FUNCTIONAL BLOCK DIAGRAMS
ADG428
ADG429
S1 S1A
S4A
DA
D
S1B
DB
S8 S4B
DECODERS/DRIVERS
LATCHES
WR RS WR
A2 A1 A0 EN
DECODERS/DRIVERS
LATCHES
A1 A0 EN
RS
GENERAL DESCRIPTION
The ADG428 and ADG429 are monolithic CMOS analog
multiplexers comprising eight single channels and four differen-
tial channels respectively. On-chip address and control latches
facilitate microprocessor interfacing. The ADG428 switches one
of eight inputs to a common output as determined by the 3-bit
binary address lines A0, A1 and A2. The ADG429 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 both devices is used to enable or disable the device.
When disabled, all channels are switched OFF. All the control
inputs, address and enable inputs are TTL compatible over the
full specified operating temperature range. This makes the part
suitable for bus-controlled systems such as data acquisition sys-
tems, process controls, avionics and ATEs because the TTL-
compatible address latches simplify the digital interface design
and reduce the board space required.
The ADG428/ADG429 are designed on an enhanced LC2MOS
process that provides low power dissipation yet gives high switching
speed and low on resistance. Each channel conducts equally well
in both directions when ON and has an input signal range that
extends to the supplies. In the OFF condition, signal levels up to
the supplies are blocked. All channels exhibit break-before-make
switching action, preventing momentary shorting when switching
channels. Inherent in the design is low charge injection for mini-
mum transients when switching the digital inputs.
The ADG428/ADG429 are improved replacements for the
DG428/DG429 Analog Multiplexers.
PRODUCT HIGHLIGHTS
1. Extended Signal Range
The ADG428/ADG429 are fabricated on an enhanced
LC2MOS process, giving an increased signal range that ex-
tends to the supply rails.
2. Low Power Dissipation
3. Low RON
4. Single/Dual Supply Operation
5. Single Supply Operation
For applications where the analog signal is unipolar, the
ADG428/ADG429 can be operated from a single rail power
supply. The parts are fully specified with a single +12 V
power supply and will remain functional with single supplies
as low as +5 V.
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.
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., 1999
1 page  
TERMINOLOGY
VDD Most positive power supply potential.
VSS Most negative power supply potential in dual
supplies. In single supply applications, it may
be connected to ground.
GND
Ground (0 V) reference.
RON
∆RON
Ohmic resistance between D and S.
Difference between the RON of any two
channels.
IS (OFF)
ID (OFF)
ID, IS (ON)
Source leakage current when the switch is off.
Drain leakage current when the switch is off.
Channel leakage current when the switch is
on.
VD (VS)
CS (OFF)
Analog voltage on terminals D, S.
Channel input capacitance for “OFF”
condition.
CD (OFF)
Channel output capacitance for “OFF”
condition.
CD, CS (ON)
CIN
tON (EN)
“ON” switch capacitance.
Digital input capacitance.
Delay time between the 50% and 90% points
of the digital input and switch “ON”
condition.
tOFF (EN)
Delay time between the 50% and 90% points
of the digital input and switch “OFF”
condition.
tTRANSITlON
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.
tOPEN
“OFF” time measured between 80% points of
both switches when switching from one
address state to another.
VINL
VINH
IINL (IINH)
Crosstalk
Maximum input voltage for Logic “0.”
Minimum input voltage for Logic “1.”
Input current of the digital input.
A measure of unwanted signal which is
coupled through from one channel to another
as a result of parasitic capacitance.
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.
IDD Positive supply current.
ISS Negative supply current.
ADG428/ADG429
ADG428 Truth Table
A2 A1 A0 EN WR RS ON SWITCH
Latching
XXXXg 1
Maintains Previous
Switch Condition
Reset
XXXXX0
NONE
(Latches Cleared)
Transparent Operation
XXX0 0 1
000101
001101
010101
011101
100101
101101
110101
111101
NONE
1
2
3
4
5
6
7
8
ADG429 Truth Table
A1 A0 EN WR RS ON SWITCH PAIR
Latching
X X X g 1 Maintains Previous
Switch Condition
Reset
XXXX0
NONE
(Latches Cleared)
Transparent Operation
X X 0 0 1 NONE
001011
011012
101013
111014
REV. C
–5–
5 Page 
3V
EN
VOUT
QINJ = CL ؋ ⌬VOUT
⌬VOUT
VS RS
VIN
ADG428/ADG429
VDD
VSS
VDD
VSS
A0 RS
A1
A2 ADG428*
SD
EN
GND WR
2.4V
VOUT
CL
10nF
*SIMILAR CONNECTION FOR ADG429
Test Circuit 10. Charge Injection
VDD
VSS
VDD
VSS
A0
RS
A1
A2
ADG428
S1
D
2.4V
VOUT
VS S8
1k⍀
0V EN
GND WR
1k⍀
VS
VDD
VSS
VDD
VSS
A0 EN
A1 RS
A2 ADG428
S1 D
S2
S8
GND WR
2.4V
VOUT
1k⍀
Test Circuit 11. OFF Isolation
Test Circuit 12. Crosstalk
REV. C
–11–
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet ADG428.PDF ] | |
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