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Data Sheets (.pdf)
AA Series AAK001 AAT001/AAT009 AAT003 AAT006 AAT101 AB Series ABT Series ABL Series ACT001 AD Series ADA Series ADK991 ADL Series ADT001 ADT002 ADT9xx ADV Series
AET Series AFL Series AHL Series AHK991 AHT Series AKL Series AKT001 ALT Series ALT 521 D Series ASR002 ASR012 ASR022 SM12x Series SM223 SM225 SM228 SM324
IL01x IL260 IL261 IL262 IL2985 IL3022 IL3085 IL3122 IL3185 IL3222 IL3285 IL3422 IL3485 IL3522 IL3585 IL3685 IL3685P IL41050TT IL41050TA IL41050TFD Series IL422
IL485 IL485W IL4622 / IL4685 / IL4822 IL5xx Series IL6xx Series IL6xxA Series IL6xxCMTI Series IL710 IL711 IL712 IL715 IL716 IL717 IL721 IL76xx / IL78xx Series IL8xxT Series
ACT001 DB001 DC001 DC002 ILDC1x
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Isolated ADCs and DACs
and Serial Peripheral Interface (SPI)

Isolating ADCs and DACs eliminates ground loops and reduces noise.

Compared to other isolators, IsoLoops Isolators minimize signal distortion with typical propagation delay of 10 ns and jitter of 100 ps. Reduce board space with up to five channels in 0.15" or 0.3"-wide SOICs.

Illustrative circuits:

  •
Single-Channel Isolated SPI Delta-Sigma A/D Converter Using IL717
 
• Multi-Channel Isolated Sampling A/D Converter Using IL261  
•
Multi-Channel Isolated SPI Delta-Sigma A/D Converter Using IL261s
 
•
Isolated Multi-Channel SPI Sampling With IL262
 
• Isolated 12-Bit DAC Using Three IL515s  
• Isolated Audio DAC Using Two IL260s  
 
 
Recommended application bulletins:
  AB-11: Isolated A/D Converters
This bulletin shows how Isoloop isolators are used to enhance static and dynamic ADC performance through effective digital current steering.
 
AB-14: Isolating Data Converters—What’s All the Noise About?
Isolation is a cost-effective way to reduce data converter system noise and increase resolution. This bulletin shows how to achieve “best in class” distortion specs with the correct mix of isolation and appropriate ground plane PCB layers. 

 
NVE Technical Video IL700-Series
Isolator Overview 
NVE Technical Video SPI Isolation
 
NVE Technical Video ADC Layout Tips
 

 3, 4, and 5-Channel Bidirectional Isolator selector guide


Single-Channel Isolated SPI Delta-Sigma A/D Converter Using IL717

This circuit illustrates a typical single-channel delta-sigma isolated ADC SPI interface. The ADC is located on the bridge with no signal conditioning electronics between the bridge sensor and the ADC. The IL717 isolates the control bus from the microcontroller and the system clock is located on the isolated side of the system.

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Multi-Channel Isolated Sampling A/D Converter Using IL261

The IL261 is ideal for isolating multi-channel sampling ADCs. Isolated channels A0 and A1 control the analog channel being sampled, while the three remaining I/O lines on the IL261 isolate the SPI interface.

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Multi-Channel Isolated SPI Delta-Sigma A/D Converter Using IL261s

This circuit illustrates multiple ADCs 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 fifth channel to the IL717. This fifth channel is used to distribute a single, isolated SPI clock to multiple ADCs.

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Isolated Multi-Channel SPI A/D Sampling With IL262s

A multi-channel sampling system with separate A/D cells. The IL262 is used to control the SPI lines and send back ADC BUSY commands to the host, allowing efficient interrupt-driven sampling. The BUSY line may also be used as a frame synchronization signal in video applications.

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Isolated 12-Bit DAC Using Three IL515s

The IL515 four-channel isolator is ideally suited for parallel bus isolation. The circuit above uses three IL515s to isolate a 12-bit DAC. The unique SYNC function allows the internal clock to be shut off, eliminating the small amount of noise associated with this clock. A reset pulse is applied at power-on to ensure correct data on the isolator outputs. After the reset pulse goes high, data transfer from input to output is initiated by the leading edge of each changing data bit.

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Isolated Audio DAC Using Two IL260s

Isolation ensures the best DAC performance by eliminating much of the digital noise that tends to find its way onto the analog output. The unique five-channel IL260 isolator series allows ten channels of isolation with just two narrow-body or wide-body ICs.

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