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VTL5C1 Datasheet(PDF) 71 Page - PerkinElmer Optoelectronics |
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VTL5C1 Datasheet(HTML) 71 Page - PerkinElmer Optoelectronics |
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71 / 76 page  66 Application Notes—Analog Optical Isolators The control loop consists of op-amp A2 and resistors R1 and R4. This circuit sets the LED current so that: If we set: R3 = R4 and: R1 = R2 then: eout / ein = VREF / VC or: eout = ein (VREF / VC) where VC = control voltage Note that R1 and R2 are the two halves of the cell. These two resistors match within 10% and track over a wide range within 5% so that the gain is closely set by VC when VREF is fixed. The limits of operation are: 0 < VC < VREF and the signal must never be so large that amplifier A1 saturates when the gain is at maximum. This circuit performs a dividing operation with ein and VC as the numerator and denominator respectively. The accuracy is limited by the tracking ability of the two sides of the photocell. The error due to matching can be eliminated by trimming R4. Figure 10. Electrically Programmable Gain V REF V C ----------- R 1 R 4 + () R 1 ---------------------- = e out e in -------- V REF V C ----------- Gain == |
Similar Part No. - VTL5C1 |
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Similar Description - VTL5C1 |
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