1

2

3

4

5

6

7

8

16

14

13

12

11

10

9

INB

OUTC

VCC2

VCC1

0.1 µF

0.1 µF

Copyright © 2016, Texas Instruments Incorporated

INA

OUTB

IND

OUTD

INC

OUTC

VCC1

GND1

INA

INB

INC

IND

NC

GND1

VCC2

GND2

OUTA

OUTB

OUTC

OUTD

EN2

GND2

GND1

GND2

GND1

GND2

EN

ISO7840

22

ISO7840, ISO7840F

SLLSEN2B – JULY 2015 – REVISED APRIL 2016

www.ti.com

Product Folder Links: ISO7840 ISO7840F

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Copyright © 2015–2016, Texas Instruments Incorporated

Typical Application (continued)

9.2.1 Design Requirements

For this design example, use the parameters shown in Table 3.

Table 3. Design Parameters

PARAMETER

VALUE

Supply voltage

2.25 to 5.5 V

Decoupling capacitor between VCC1 and GND1

0.1 µF

Decoupling capacitor from VCC2 and GND2

0.1 µF

9.2.2 Detailed Design Procedure

Unlike optocouplers, which require external components to improve performance, provide bias, or limit current,

the ISO7840 device only requires two external bypass capacitors to operate.

Figure 19. Typical ISO7840 Circuit Hook-Up

9.2.3 Application Curve

The typical eye diagram of the ISO7840 device indicates low jitter and wide open eye at the maximum data rate

of 100 Mbps.

Figure 20. Eye Diagram at 100 Mbps PRBS, 5 V and 25°C