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ADM2485

High Speed, Isolated RS-485 Transceiver with Integrated Transformer Driver

Analog Devices 

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

ADM2485

D1 1

D2 2

GND1 3

VDD1 4

RxD 5

RE 6

RTS 7

TxD 8

ADM2485

TOP VIEW

(Not to Scale)

16 VDD2

15 GND2

14 GND2

13 B

12 A

11 GND2

10 DE OUT

9 GND2

Figure 6. Pin Configuration

Table 8. Pin Function Description

Pin No.

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 (3.3 V or 5 V). 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 tristated when the receiver is disabled, that is, when RE is driven high.

6

RE

Receiver Enable Input. This is an active-low input. Driving this input low enables the receiver; driving it

high disables the receiver.

7

RTS

Driver Enable Input. Driving this input high enables the driver; driving it low disables the driver.

8

TxD

Driver Input. Data to be transmitted by the driver is applied to this input.

9, 11, 14, 15 GND2

10

DE OUT

Ground, Bus Side.

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.

16

VDD2

Power Supply, Bus Side (Isolated 5 V Supply). Decoupling capacitor to GND2 required; capacitor value

should be between 0.01 μF and 0.1 μF.

Rev. A | Page 9 of 20

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