ADM2481 Datasheet, PDF (7/20 Pages) Analog Devices – Half-Duplex, iCoupler Isolated RS-485 Transceiver

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
ADM2481
V_DD1 1
16 V_DD2
GND₁₁ 2
15 GND₂₁
RxD 3 _ADM2481 14 NC
RE 4 _{TOP VIEW} 13 B
DE 5 (Not to Scale) 12 A
TxD 6
11 NC
GND₁₁ 7
GND₁₁ 8
10 GND₂₁
9 GND₂₁
NC = NO CONNECT
1 _{PIN 2, PIN 7, AND PIN 8 MUST BE CONNECTED TO GND1.}
PIN 9, PIN 10, AND PIN 15 MUST BE CONNECTED TO GND₂.
Figure 2. Pin Configuration
Table 8. Pin Function Descriptions
Pin No.
Mnemonic
1
VDD1
2, 7, 8
GND1
3
RxD
4
RE
5
6
9, 10, 15
11, 14
12
DE
TxD
GND2
NC
A
13
B
16
VDD2
Description
Power Supply (Logic Side).
Ground (Logic Side).
Receiver Output Data. When enabled, if (A − B) ≥ −30 mV, then RxD = high; if (A − B) ≤ −200 mV, then
RxD = low. This is a tristate output 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, and
driving it high disables the receiver.
Driver Enable Input. Driving the input high enables the driver, and driving it low disables the driver.
Transmit Data Input. Data to be transmitted by the driver is applied to this input.
Ground (Bus Side).
No Connect.
Noninverting Driver Output/Receiver Input. When the driver is disabled, or when VDD1 or VDD2 is
powered down, Pin A is put into a high impedance state to avoid overloading the bus.
Inverting Driver Output/Receiver Input. When the driver is disabled, or when VDD1 or VDD2 is powered
down, Pin B is put into a high impedance state to avoid overloading the bus.
Power Supply (Bus Side).
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