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ADM3488E Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer ADM3488E
Beschreibung (ADM3483E - ADM3491E) low power data transceivers
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 20 Seiten
ADM3488E Datasheet, Funktion
www.DataSheet4U.com
3.3 V, ±15 kV ESD-Protected, Half- and
Full-Duplex, RS-485/RS-422 Transceivers
ADM3483E/ADM3486E/ADM3488E/ADM3490E/ADM3491E
FEATURES
TIA/EIA RS-485/RS-422 compliant
±15 kV ESD protection on RS-485 input/output pins
Data rates
ADM3483E/ADM3488E: 250 kbps
ADM3486E: 2.5 Mbps
ADM3490E/ADM3491E: 12 Mbps
Half- and full-duplex options
Up to 32 nodes on the bus
Receiver open-circuit, fail-safe design
Low power shutdown current
(ADM3483E/ADM3486E/ADM3491E only)
Outputs high-Z when disabled or powered off
Common-mode input range: −7 V to +12 V
Thermal shutdown and short-circuit protection
Industry-standard 75176 pinout
8-lead and 14-lead narrow SOIC packages
APPLICATIONS
Power/energy metering
Telecommunications
EMI-sensitive systems
Industrial control
Local area networks
GENERAL DESCRIPTION
The ADM3483E/ADM3486E/ADM3488E/ADM3490E/
ADM3491E are 3.3 V, low power data transceivers with
±15 kV ESD protection suitable for full- and half-duplex
communication on multipoint bus transmission lines. They
are designed for balanced data transmission, and they
comply with TIA/EIA standards RS­485 and RS-422. The
ADM3483E/ADM3486E are half-duplex transceivers that
share differential lines and have separate enable inputs for
the driver and receiver. The full-duplex ADM3488E/
ADM3490E/ADM3491E transceivers have dedicated
differential line driver outputs and receiver inputs. The
ADM3491E also features separate enable inputs for the
driver and receiver.
The devices have a 12 kΩ receiver input impedance,
which allows up to 32 transceivers on a bus. Because only
one driver should be enabled at any time, the output of a
disabled or powered-down driver is tristated to avoid
overloading the bus.
FUNCTIONAL BLOCK DIAGRAMS
VCC
ADM3483E/
ADM3486E
RO R
RE
DE
DI D
A
B
GND
Figure 1.
VCC
ADM3488E/
ADM3490E
A
RO
R
B
DI D
Z
Y
GND
Figure 2.
VCC
ADM3491E
RO R
RE
DE
DI D
A
B
Z
Y
GND
Figure 3.
Rev. A
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 that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
(continued on Page 3)
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2006 Analog Devices, Inc. All rights reserved.






ADM3488E Datasheet, Funktion
www.DataSheet4U.com
ADM3483E/ADM3486E/ADM3488E/ADM3490E/ADM3491E
VCC = 3.3 V, TA = 25°C.
Table 5. ADM3490E/ADM3491E
Parameter
MAXIMUM DATA RATE
DIFFERENTIAL OUTPUT DELAY
DIFFERENTIAL OUTPUT TRANSITION TIME
PROPAGATION DELAY
From Low to High Level
From High to Low Level
|tPLH − tPHL| PROPAGATION DELAY SKEW1
ENABLE/DISABLE TIMING (ADM3491E ONLY)
Enable Time to Low Level
Enable Time to High Level
Disable Time from Low Level
Disable Time from High Level
Enable Time from Shutdown to Low Level
Enable Time from Shutdown to High Level
1 Measured on |tPLH (Y) − tPHL (Y)| and |tPLH (Z) − tPHL (Z)|.
Symbol
tDD
tTD
Min Typ
12 15
1 22
3 11
Max Unit
Mbps
35 ns
25 ns
Test Conditions/Comments
RL = 60 Ω (see Figure 10)
RL = 60 Ω (see Figure 10)
tPLH
7 23 35 ns
RL = 27 Ω (see Figure 11)
tPHL
7 23 35 ns
RL = 27 Ω (see Figure 11)
tPDS
−1.4 ±8 ns
RL = 27 Ω (see Figure 11)
tPZL
42 90 ns
RL = 110 Ω (see Figure 13)
tPZH
42 90 ns
RL = 110 Ω (see Figure 12)
tPLZ
35 80 ns
RL = 110 Ω (see Figure 13)
tPHZ
35 80 ns
RL = 110 Ω (see Figure 12)
tPSL
650 900 ns
RL = 110 Ω (see Figure 13)
tPSH
650 900 ns
RL = 110 Ω (see Figure 12)
RECEIVER TIMING SPECIFICATIONS
VCC = 3.3 V, TA = 25°C.
Table 6. ADM3483E/ADM3486E/ADM3488E/ADM3490E/ADM3491E
Parameter
Symbol Min Typ
PROPAGATION DELAY
From Low to High Level
tRPLH
ADM3486E/ADM3490E/ADM3491E
25 62
ADM3483E/ADM3488E
25 75
From High to Low Level
tRPHL
ADM3486E/ADM3490E/ADM3491E
25 62
ADM3483E/ADM3488E
25 75
|tRPLH − tRPHL| PROPAGATION DELAY SKEW
tRPDS
ADM3486E/ADM3490E/ADM3491E
+6
ADM3483E/ADM3488E
+12
ENABLE/DISABLE TIMING (ADM3483E/ADM3486E/
ADM3491E ONLY)
Enable Time to Low Level
tRPZL
25
Enable Time to High Level
tRPZH
25
Disable Time from Low Level
tRPLZ
25
Disable Time from High Level
tRPHZ
25
Enable Time from Shutdown to Low Level
tRPSL
720
Enable Time from Shutdown to High Level
Time to Shutdown1
tRPSH
tSHDN
720
80 190
Max
90
120
90
120
±10
±20
50
50
45
45
1400
1400
300
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Test Conditions/Comments
VID = 0 V to 3.0 V, CL = 15 pF (see Figure 14)
VID = 0 V to 3.0 V, CL = 15 pF (see Figure 14)
VID = 0 V to 3.0 V, CL = 15 pF (see Figure 14)
VID = 0 V to 3.0 V, CL = 15 pF (see Figure 14)
VID = 0 V to 3.0 V, CL = 15 pF (see Figure 14)
VID = 0 V to 3.0 V, CL = 15 pF (see Figure 14)
CL = 15 pF (see Figure 15)
CL = 15 pF (see Figure 15)
CL = 15 pF (see Figure 15)
CL = 15 pF (see Figure 15)
CL = 15 pF (see Figure 15)
CL = 15 pF (see Figure 15)
1 The transceivers are put into shutdown mode by bringing the RE high and the DE low. If the inputs are in this state for less than 80 ns, the parts are guaranteed not to
enter shutdown. If the parts are in this state for 300 ns or more, the parts are guaranteed to enter shutdown.
Rev. A | Page 6 of 20

6 Page









ADM3488E pdf, datenblatt
www.DataSheet4U.com
ADM3483E/ADM3486E/ADM3488E/ADM3490E/ADM3491E
120
100
80
60
40
20
0
0 2 4 6 8 10 12
OUTPUT LOW VOLTAGE (V)
Figure 22. Output Current vs. Driver Output Low Voltage
120
100
80
60
40
20
0
–7 –6 –5 –4 –3 –2 –1 0 1 2 3 4
OUTPUT HIGH VOLTAGE (V)
Figure 23. Output Current vs. Driver Output High Voltage
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
–40
–10 20
50
TEMPERATURE (°C)
Figure 24. Supply Current vs. Temperature
80
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
–50 –25
0
25 50
TEMPERATURE (°C)
75
Figure 25. Shutdown Current vs. Temperature
DI
3
Y
CH1 Z
CH2
CH1 1.0V CH2 1.0V
CH3 2.0V
IT 400ps/pt A CH3 1.44V
M20ns 1.25GS/s
Figure 26. ADM3490E/ADM3491E Driver Propagation Delay
VA – VB
M1
RO
3
CH3 2.0V M200ns 250MS/s
MATH1 2.01V 200ns
4ns/pt A CH2 1.24V
Figure 27. ADM3490E/ADM3491E Receiver Propagation Delay,
Driven by External RS-485 Device
Rev. A | Page 12 of 20

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