ADM3251E_VE View Datasheet(PDF) - Analog Devices

Part Name

Description

Manufacturer

ADM3251E_VE

Isolated, Single-Channel RS-232 Line Driver/Receiver

Analog Devices 

ADM3251E

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

NC 1

VCC 2

VCC 3

GND 4

GND 5

GND 6

GND 7

ROUT 8

TIN 9

GND 10

ADM3251E

TOP VIEW

(Not to Scale)

20 VISO

19 V+

18 C1+

17 C1–

16 TOUT

15 RIN

14 C2+

13 C2–

12 V–

11 GNDISO

NC = NO CONNECT

Figure 2. Pin Configuration

Table 8. Pin Function Descriptions

Pin No.

Mnemonic Description

1

NC

No Connect. This pin should always remain unconnected.

2, 3

VCC

Power Supply Input. A 0.1 μF decoupling capacitor is required between VCC and ground. When a voltage

between 4.5 V and 5.5 V is applied to the VCC pin, the integrated dc-to-dc converter is enabled. If this voltage is

lowered to between 3.0 V and 3.7 V, the integrated dc-to-dc converter is disabled.

4, 5, 6, 7, 10 GND

Ground.

8

ROUT

Receiver Output. This pin outputs CMOS logic levels.

9

TIN

Transmitter (Driver) Input. This pin accepts TTL/CMOS levels.

11

GNDISO

Ground Reference for Isolator Primary Side.

12

V−

Internally Generated Negative Supply.

13, 14

C2−, C2+

Positive and Negative Connections for Charge Pump Capacitors. External Capacitor C2 is connected between

these pins; a 0.1 μF capacitor is recommended, but larger capacitors up to 10 μF can be used.

15

RIN

Receiver Input. This input accepts RS-232 signal levels.

16

TOUT

Transmitter (Driver) Output. This outputs RS-232 signal levels.

17, 18

C1−, C1+

Positive and Negative Connections for Charge Pump Capacitors. External Capacitor C1 is connected between

these pins; a 0.1 μF capacitor is recommended, but larger capacitors up to 10 μF can be used.

19

V+

Internally Generated Positive Supply.

20

VISO

Isolated Supply Voltage for Isolator Secondary Side. A 0.1 μF decoupling capacitor is required between VISO and

ground. When the integrated dc-to-dc converter is enabled, the VISO pin should not be used to power external

circuitry. If the integrated dc-to-dc converter is disabled, power the secondary side by applying a voltage in the

range of 3.0 V to 5.5 V to this pin.

Rev. E | Page 8 of 16

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