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ADM2485BRWZ Scheda tecnica(PDF) 7 Page - Analog Devices

Il numero della parte ADM2485BRWZ
Spiegazioni elettronici  High Speed Isolated RS-485 Transceiver with Integrated Transformer Driver
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Produttore elettronici  AD [Analog Devices]
Homepage  http://www.analog.com
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Preliminary Technical Data
ADM2485
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
D1 1
ADM2485
2
3
4
5
16
15
14
13
12
TOP V IEW
( Not t o Scale)
6
7
8
11
10
9
VDD2
D2
GND2
GND1
GND2
VDD1
B
RxD
A
RE
GND2
RTS
DE OUT
TxD
GND2
Figure 2. Pin Configuration
Table 4.
Pin
Mnemonic
Function
1
D1
Transformer driver terminal 1.
2
D2
Transformer driver terminal 2.
3
GND1
Ground, Logic Side.
4
VDD1
Power Supply Logic Side, 3V or 5V. Decoupling capacitor to GND1 required, capacitor value should
be between 0.01 µF and 0.1 µF.
5
RxD
Receiver Output data. This output is high when (A – B) > 200 mV, and low when (A – B) < -200
mV. The output is tri-stated when the receiver is disabled, i.e. when RE is driven high.
6
RE
Receiver Enable input. This is an active-low input. Driving this input low enables the receiver,
while driving it high disables the receiver.
7
RTS
Driver enable input. Driving this input high enables the driver, while driving it low disables the
driver.
8
TxD
Driver input. Data to be transmitted by the driver is applied to this input.
10
DE OUT
Driver Enable status output
12
A
Noninverting Driver Output/Receiver Input. When the driver is disabled or VDD1 or VDD2 is powered
down, pin A is put in a high impedance state to avoid overloading the bus.
13
B
Inverting Driver Output/Receiver Input. When the driver is disabled or VDD1 or VDD2 is powered
down, pin B is put in a high impedance state to avoid overloading the bus.
9,11,14,15
GND2
Ground, Bus Side.
16
VDD2
Power Supply Bus Side, Isolated 5V supply. Decoupling capacitor to GND2 required, capacitor value
should be between 0.01 µF and 0.1 µF.
Rev. PrK | Page 7 of 15


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