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ELM Video Technology, Inc.
"Innovative Midi and DMX Products"
http://elmvideotechnology.com
DMX Opto vs. Standard Input/Output IC Comparison Table
DMX product line addendum about optical isolation verses a standard IC or chip set on the input and output of a device or product.
Based on IC specifications.
Standard IC SN75176AP | Optical Isolated IC 6N137 |
TVS
Isolation SN75LBC184 |
True Fault MAX3088E |
|
Isolation Type |
Electronic | Optical | Electronic - Transient Voltage Suppression | Electronic |
Line Load (input impedance) |
1/32 (Apx 1.9mA
|
1/2 (Apx 25mA
|
1/128 (Apx .5mA
|
1/256 (Apx .25mA
|
Fault Indication broken or loose wire |
*Unstable (LED = unknown) |
*Stable
(LED = Off) |
*Stable (LED = Off) |
*Stable
(LED = Off) |
Fault Indication Open w/ Termination |
*Unstable (LED = unknown) |
*Stable (LED = Off) |
*Unstable (LED = unknown) |
*Stable (LED = Off) |
DMX512 Conformity |
Yes | **No | Yes | Yes |
ELM Products | Standard IC SN75176AP | Optical Isolated IC 6N137 | SN75LBC184 | MAX3088E |
DS4 Version A 1x4 Splitter |
(4) Output IC's | Input IC | ||
DS4 Version B 1x4 Splitter Upgraded chipset |
(4) Output IC's | Input IC | ||
DSI-4 1x4 Opto In Iso Splitter |
(4) Output IC's | Input IC | ||
***DBOP Optical Buffer |
Input IC & Output IC |
|||
***DBOP Optical Buffer Upgraded chipset |
Output IC | Input IC | ||
DS5 1x5 Splitter |
(5) Output IC's | Input IC | ||
DS5
1x5 Splitter Upgraded chipset |
(5) Output IC's | Input IC | ||
DXI Mini Opto Iso Buffer |
Output | Input IC | Optional Output IC | |
DXT Mini Buffer/Driver |
Input IC & Output IC |
|||
DXT Mini Buffer/Driver Upgraded chipset |
Output IC | Input IC |
*Circuit design and environment affect the output
**6N137 does NOT conform to the DMX512 standards but should work with most systems.
***The DBOP2 (Dual Power Supply Version) is designed with isolated power and gnd inputs between the input and output circuits
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The Advantages of Optical Isolation on the input of a device
The Disadvantage of Optical Isolation on the input of a device ( See Texas Instruments web site chip # 6N137 for specs )
The Advantages of TVS Isolation IC (75184) on the input of a device ( See Texas Instruments web site chip # SN75LBC184 for specs )
The Disadvantage of TVS Isolation IC (75184) on the input of a device
The Advantage of True Fault IC MAX3088E on the input of a device
The Disadvantage of True Fault IC MAX3088E on the input of a device
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