adm2485 Analog Devices, Inc., adm2485 Datasheet - Page 8

• Manufacturer Part Number: adm2485
• Description: High Speed Isolated Rs-485 Transceiver With Integrated Transformer Driver
• Manufacturer: Analog Devices, Inc.

ADM2485
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
Table 8.
Pin
1
2
3
4
5
6
7
8
10
12
13
9, 11, 14, 15
16
Mnemonic
D1
D2
GND
V
RxD
RE
RTS
TxD
DE OUT
A
B
GND
V
DD1
DD2
1
2
Function
Transformer Driver Terminal 1.
Transformer Driver Terminal 2.
Ground, Logic Side.
Power Supply, Logic Side (3.3 V or 5 V). Decoupling capacitor to GND
between 0.01 μF and 0.1 μF.
Receiver Output Data. This output is high when (A – B) > 200 mV and low when (A – B) < –200 mV. The
output is tristated when the receiver is disabled, that is, when RE is driven high.
Receiver Enable Input. This is an active-low input. Driving this input low enables the receiver; driving it high
disables the receiver.
Driver Enable Input. Driving this input high enables the driver; driving it low disables the driver.
Driver Input. Data to be transmitted by the driver is applied to this input.
Driver Enable Status Output.
Noninverting Driver Output/Receiver Input. When the driver is disabled or V
Pin A is put in a high impedance state to avoid overloading the bus.
Inverting Driver Output/Receiver Input. When the driver is disabled or V
put in a high impedance state to avoid overloading the bus.
Ground, Bus Side.
Power Supply, Bus Side (Isolated 5 V Supply) . Decoupling capacitor to GND
be between 0.01 μF and 0.1 μF.
GND
V
RxD
RTS
TxD
DD1
RE
D1
D2
1
1
2
3
4
5
6
7
8
Figure 2. Pin Configuration
Rev. 0 | Page 8 of 20
(Not to Scale)
ADM2485
TOP VIEW
16
15
14
13
12
11
10
9
V
GND
GND
B
A
GND
DE OUT
GND
DD2
2
2
2
2
1
required; capacitor value should be
DD1
2
or V
required; capacitor value should
DD1
DD2
or V
is powered down, Pin B is
DD2
is powered down,