IL260 datasheet(5/7 Pages) ETC

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IL26XISOLOOP®

Bridge +

Serial Data Out

Serial Data In

Data Clock

Chip Select

Iso SD Out

Iso DS In

Iso Data Clock

Iso CS

Bridge -

OSC 2

IL717

CS5532

Clock

Generator

Bridge

Bias

Delta Sigma A/D

Isolation

Boundary

Bridge +

Serial Data Out

Serial Data In

Data Clock

Chip Select

Iso SD Out

Iso DS In

Iso Data Clock

Iso CS

Bridge -

OSC 2

IL261

CS5532

Clock

Generator

Bridge

Bias

Delta Sigma A/D

Isolation

Boundary

Bridge +

Serial Data Out

Serial Data In

Data Clock

Chip Select

Iso SD Out

Iso DS In

Iso Data Clock

Iso CS

Bridge -

OSC 2

IL261

CS5532

Bridge

Bias

Delta Sigma A/D

Channel #1

Channel #n

Figure 1 shows a typical single channel

∆Σ ADC

application. The A/D is located on the bridge with no

signal conditioning electronics between the bridge sensor

and the ADC. In this application, the IL717 is the best

choice for isolation. It isolates the control bus from the

microcontroller. The system clock is located on the

isolated side of the system.

The second

∆Σ application is where multiple ADC's are

configured in a channel-to-channel isolation configuration.

The problem for designers is how to control clock jitter

and edge placement accuracy of the system clock for each

ADC. The best solution is to use a single clock on the

system side and distribute this to each ADC. The IL261

adds a 5th channel to the IL717. This 5th channel is used

to distribute a single, isolated clock to multiple ADC's as

shown in Figure 2.

Applications:

Figure 2 Multi Channel ∆Σ

Figure 1 Single Channel ∆Σ

Preliminary

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