ADM2485(RevPrk) 查看數據表（PDF） - Analog Devices

零件编号

产品描述 (功能)

生产厂家

ADM2485
(Rev.:RevPrk)

High Speed Isolated RS-485 Transceiver with Integrated Transformer Driver

Analog Devices 

Preliminary Technical Data

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

ADM2485

Table 4.

Pin

1

2

3

4

5

6

7

8

10

12

13

9,11,14,15

16

Mnemonic

D1

D2

GND1

VDD1

RxD

RE

RTS

TxD

DE OUT

A

B

GND2

VDD2

D1 1

D2 2

GND1 3

VDD1 4

RxD 5

RE 6

RTS 7

TxD 8

ADM2485

T OP V IEW

( Not t o Scale)

16 VDD2

15 GND2

14 GND2

13 B

12 A

11 GND2

10 DE OUT

9 GND2

Figure 2. Pin Configuration

Function

Transformer driver terminal 1.

Transformer driver terminal 2.

Ground, Logic Side.

Power Supply Logic Side, 3V or 5V. Decoupling capacitor to GND1 required, capacitor value should

be 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 tri-stated when the receiver is disabled, i.e. when RE is driven high.

Receiver Enable input. This is an active-low input. Driving this input low enables the receiver,

while driving it high disables the receiver.

Driver enable input. Driving this input high enables the driver, while 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 VDD1 or VDD2 is powered

down, 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 VDD1 or VDD2 is powered

down, pin B is put in a high impedance state to avoid overloading the bus.

Ground, Bus Side.

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

Share Link: