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ADM1487E の電気的特性と機能

ADM1487EのメーカーはAnalog Devicesです、この部品の機能は「(ADMx48xE) transceivers」です。


製品の詳細 ( Datasheet PDF )

部品番号 ADM1487E
部品説明 (ADMx48xE) transceivers
メーカ Analog Devices
ロゴ Analog Devices ロゴ 




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ADM1487E Datasheet, ADM1487E PDF,ピン配置, 機能
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5 V, ±15 kV ESD Protected
Half-Duplex, RS-485/RS-422 Transceivers
ADM485E/ADM487E/ADM1487E
FEATURES
TIA/EIA RS-485-/RS-422-compliant
ESD protection on RS-485 I/O pins
±15 kV human body model
Data rates
ADM487E: 250 kbps
ADM485E/ADM1487E: 2.5 Mbps
Half-duplex options
Reduced slew rates for low EMI
−7 V to +12 V common-mode input range
Thermal shutdown and short-circuit protection
8-lead SOIC packages
APPLICATIONS
Energy/power metering
Lighting systems
Industrial control
Telecommunications
Security systems
Instrumentation
FUNCTIONAL BLOCK DIAGRAM
VCC
ADM485E/
ADM487E/
ADM1487E
RO R
RE A
DE B
DI D
GND
Figure 1.
GENERAL DESCRIPTION
The ADM485E/ADM487E/ADM1487E are 5 V, low power
data transceivers with ±15 kV ESD protection suitable for half-
duplex communication on multipoint bus transmission lines.
They are designed for balanced data transmission and comply
with Telecommunication Industry Association/Electronics Indus-
tries Association (TIA/EIA) standards RS-485 and RS-422. The
ADM487E and ADM1487E have a 1/4 unit load receiver input
impedance that allows up to 128 transceivers on a bus, whereas
the ADM485E allows up to 32 transceivers on a bus. Because
only one driver is enabled at any time, the output of a disabled or
power-down driver is three-stated to avoid overloading the bus.
The driver outputs are slew rate-limited to reduce EMI and data
errors caused by reflections from improperly terminated buses.
Excessive power dissipation caused by bus contention or output
shorting is prevented with a thermal shutdown circuit.
The parts are fully specified over the industrial temperature
ranges and are available in 8-lead SOIC packages.
Table 1. Selection Table
Part
Number
ADM485E
ADM487E
ADM1487E
Half-/Full-
Duplex
Half
Half
Half
Guaranteed
Data Rate
(Mbps)
2.5
0.25
2.5
Slew Rate
Limited
No
Yes
No
Low Power
Shutdown
No
Yes
No
Driver/Receiver
Enable
Yes
Yes
Yes
Quiescent
Current (μA)
300
120
230
Number of
Nodes on Bus
32
128
128
Pin
Count
8
8
8
Rev. 0
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.
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
©2007 Analog Devices, Inc. All rights reserved.

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ADM1487E pdf, ピン配列
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ADM485E/ADM487E/ADM1487E
SPECIFICATIONS
VCC = 5 V ± 5%, TA = TMIN to TMAX, unless otherwise noted.
Table 2. ADM485E/ADM487E/ADM1487E
Parameter
Symbol Min Typ Max
DRIVER
Differential Outputs
Differential Output Voltage (no Load) VOD1
5
Differential Output Voltage (with Load) VOD2
2
1.5 5
Δ |VOD| for Complementary Output
States
0.2
Common-Mode Output Voltage
VOC
3
Δ |VOC| for Complementary Output
States
0.2
Logic Inputs
Input High Voltage
VIH 2.0
Input Low Voltage
VIL
0.8
Logic Input Current
IIN1
±2
RECEIVER
Input Current (A, B) IIN2 1.0
−0.8
0.25
−0.2
Differential Inputs
Differential Input Threshold Voltage
Input Hysteresis
Receiver Output Logic
Output Voltage High
Output Voltage Low
Three-State Output Leakage Current
Receiver Input Resistance
POWER SUPPLY
No Load Supply Current
VTH
ΔVTH
VOH
VOL
IOZR
RIN
ICC
Supply Current in Shutdown
Driver Short-Circuit Current, VO High
Driver Short-Circuit Current, VO Low
Receiver Short-Circuit Current
ESD PROTECTION
A, B Pins
ISHDN
IOSD1
IOSD2
IOSR
−0.2
70
+0.2
3.5
0.4
±1
12
48
500 900
300 500
300 500
230 400
250 400
120 250
0.5 10
35 250
35 250
7 95
±15
Unit Test Conditions/Comments
V
V RL = 50 Ω (RS-422)
V RL = 27 Ω (RS-485) (see Figure 18)
V RL = 27 Ω or 50 Ω (see Figure 18)
V RL = 27 Ω or 50 Ω (see Figure 18)
V RL = 27 Ω or 50 Ω (see Figure 18)
V DE, DI, RE
V DE, DI, RE
μA DE, DI, RE
mA DE = 0 V, VIN = 12 V
mA VCC = 0 V or +5.25 V, VIN = −7 V (ADM485E)
mA DE = 0 V, VIN = 12 V
mA VCC = 0 V or +5.25 V, VIN = −7 V
(ADM487E/ADM1487E)
V −7 V < VCM < +12 V
mV VCM = 0 V
V IOUT = −4 mA, VID = +200 mV
V IOUT = +4 mA, VID = −200 mV
μA 0.4 V < VO < 2.4 V
kΩ −7 V < VCM < +12 V (ADM485E)
kΩ −7 V< VCM < +12 V (ADM487E/ADM1487E)
μA RE = 0 V or VCC, DE = VCC (ADM485E)
μA RE = 0 V or VCC, DE = 0 V (ADM485E)
μA RE = 0 V or VCC, DE = VCC (ADM1487E)
μA RE = 0 V or VCC, DE = 0 V (ADM1487E)
μA RE = 0 V or VCC, DE = VCC (ADM487E)
μA RE = 0 V, DE = 0 V (ADM487E)
μA DE = 0 V, RE = VCC (ADM487E)
mA −7 V ≤ VO ≤ +12 V, applies to peak current
−7 V ≤ VO ≤ +12 V, applies to peak current
mA 0 V ≤ VO ≤ VCC
kV Human body model
Rev. 0 | Page 3 of 16


3Pages


ADM1487E 電子部品, 半導体
www.DataSheet4U.com
ADM485E/ADM487E/ADM1487E
ABSOLUTE MAXIMUM RATINGS
TA = 25°C, unless otherwise noted.
Table 5.
Parameter
VCC to GND
Digital I/O Voltage (DE, RE)
Driver Input Voltage (DI)
Receiver Output Voltage (RO)
Driver Output/Receiver Input Voltage
(A, B)
Operating Temperature Range
Storage Temperature Range
θJA Thermal Impedance
SOIC-8
Lead Temperature
Soldering (10 sec)
Rating
−0.5 V to +6 V
−0.5 V to (VCC + 0.5 V)
−0.5 V to (VCC + 0.5 V)
−0.5 V to (VCC + 0.5 V)
−9 V to +14 V
−40° to +85°C
−65° to +150°C
158°C/W
260°C
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
ESD CAUTION
Rev. 0 | Page 6 of 16

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共有リンク

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部品番号部品説明メーカ
ADM1487

Ultralow Power RS-485/RS-422 Transceiver

Analog Devices
Analog Devices
ADM1487E

(ADMx48xE) transceivers

Analog Devices
Analog Devices


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