IL260/IL261/IL262
Application Diagram—Multi-Channel Delta-Sigma A/D Converter
In a typical single-channel delta-sigma ADC, the system clock is located on the isolated side of the system and only four channels of isolation are
required. With multiple ADCs configured in a channel-to-channel isolation configuration, however, clock jitter and edge placement accuracy of
the system clock must be matched between ADCs. The best solution is to use a single clock on the system side and distribute the clock to each
ADC. The five-channel IL261 is ideal, with the fifth channel used to distribute a single, isolated clock to multiple ADCs as shown below:
Bridge
Bias
Delta Sigma A/D
CS5532
Bridge +
Bridge -
Isolation
Boundary
Serial Data Out
Iso SD Out
Channel 1
Bridge
Bias
Bridge +
Bridge -
Serial Data In
Data Clock
Chip Select
OSC 2
Delta Sigma A/D
CS5532
Serial Data Out
Serial Data In
IL261
Iso SD In
Iso Data Clock
Iso CS
Iso SD Out
Iso SD In
Clock
Generator
Channel n
Data Clock
Chip Select
OSC 2
8
IL261
Iso Data Clock
Iso CS
NVE Corporation
11409 Valley View Road, Eden Prairie, MN 55344-3617
Phone: (952) 829-9217
Fax: (952) 829-9189
www.IsoLoop.com
?NVE Corporation
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