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ADM1487 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer ADM1487
Beschreibung Ultralow Power RS-485/RS-422 Transceiver
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 8 Seiten
ADM1487 Datasheet, Funktion
PRELIMINARY TECHNICAL DATA
a
Ultra-Low Power RS-485/RS-422 Transceiver
with Low EMI and +/-10kV ESD Protection
Preliminary Technical Data
ADM1487
FEATURES
Low Power - 120µA Max ICC with Driver Disabled
High Input Impedance — Up to 256 Transceivers on Bus
Low-Current (1µA) Shutdown Mode
Slew Rate Control for Error-Free Data
Transmission and Low EMI
±10kV ESD Protection (Human Body Model) on
RS-485 I/O pins
Thermal Protection of Driver
Glitch-Free Driver Power-Up Allows Hot Connection
Driver Maintains High Output Impedance with Power
Off
Wide Common-Mode Range Allows ±7V Ground Differ-
ences Between Devices
Pin-Compatible with Industry Standard 75176
APPLICATIONS
Battery-Powered RS-485/RS-422 Systems
Level Translation
GENERAL DESCRIPTION
The ADM1487 is an ultra-low power RS-485/RS-422
transceiver consisting of one driver and one receiver per
package. Quiescent operating current is typically 80µA
and 1µA in shutdown mode. The driver and receiver both
have three-state outputs. This allows multiple drivers to be
connected to an RS-485/RS-422 bus, or several receiver
outputs to be connected to a serial data bus. The driver
will maintain a high-impedance output state even with
power off, while the receiver features fail-safe operation
that guarantees a logic high output if the inputs are left
open-circuit.
The device has slew-rate limited drivers to minimize elec-
tromagnetic interference (EMI) and reduce reflections
caused by incorrectly terminated cables.
FUNCTIONAL BLOCK DIAGRAM
RO 1
w RE 2
w DE 3
w DI 4
R
D
8 VCC
7B
6A
5 GND
.D ADM1487
ataSheetREV. PrC 08/02
4Information furnished by Analog Devices is believed to be accurate and
Ureliable. 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
comotherwise 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
www.analog.com
Fax: 781/326-8703
Analog Devices, Inc., 2002
–1–






ADM1487 Datasheet, Funktion
PRELIMINARY TECHNICAL DATA
ADM1487
ADM1487TYPICALPERFORMANCECHARACTERISTICS
AWAITING DATA
AWAITING DATA
AWAITING DATA
TPC1. No-load Supply Current vs. Tem-
perature
TPC2. Output Current vs. Receiver Out-
put High Voltage
TPC3. Output Current vs. Receiver Out-
put Low Voltage
AWAITING DATA
AWAITING DATA
AWAITING DATA
TPC4. Receiver Output High
Voltage vs. Temperature
TPC5. Receiver Output Low
Voltage vs. Temperature
TPC6. Shutdown Current vs.
Temperature
PIN FUNCTION DESCRIPTION
Pin Mnemonic
Description
1 RO
Receiver Output. When RE is low and A - B Ն (more positive than) 200mV, RO will be high.
When RE is low and A - B Յ (more negative than) –200mV, RO will be low.
2 RE
Receiver Output Enable. Take RE low to enable RO; RO is high impedance when RE is high.
Take RE high and DE low to enter low-power shutdown mode.
3 DE
Driver Output Enable. Take DE high to enable driver outputs. These outputs are high
impedance when DE is low. Take RE high and DE low to enter low-power shutdown mode.
4 DI
Driver Input. With DE high, a low on DI forces non-inverting output low and inverting output
high. Similarly, a high on DI forces non-inverting output high and inverting output low.
5 GND
Ground
6A
Non-Inverting Receiver Input and Non-Inverting Driver Output
7B
Inverting Receiver Input and Inverting Driver Output
8 VCC
Positive Supply 4.75V =VCC =5.25V
–6– Rev. PrC

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