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ADN2814 Datasheet(PDF) 23 Page - Analog Devices |
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ADN2814 Datasheet(HTML) 23 Page - Analog Devices |
23 / 28 page Preliminary Technical Data ADN2814 Rev. PrA | Page 23 of 28 50 Ω 50 Ω PIN VREF NIN CIN COUT COUT V1 CIN V1b V2 V2b TIA LIMAMP CDR + – VCC DATAOUTP DATAOUTN 1 V1 V1b V2 V2b VDIFF 23 4 VREF VTH ADN2814 VDIFF = V2–V2b VTH = ADN2814 QUANTIZER THRESHOLD NOTES: 1. DURING DATA PATTERNS WITH HIGH TRANSITION DENSITY, DIFFERENTIAL DC VOLTAGE AT V1 AND V2 IS ZERO. 2. WHEN THE OUTPUT OF THE TIA GOES TO CID, V1 AND V1b ARE DRIVEN TO DIFFERENT DC LEVELS. V2 AND V2b DISCHARGE TO THE VREF LEVEL, WHICH EFFECTIVELY INTRODUCES A DIFFERENTIAL DC OFFSET ACROSS THE AC COUPLING CAPACITORS. 3. WHEN THE BURST OF DATA STARTS AGAIN, THE DIFFERENTIAL DC OFFSET ACROSS THE AC COUPLING CAPACITORS IS APPLIED TO THE INPUT LEVELS CAUSING A DC SHIFT IN THE DIFFERENTIAL INPUT. THIS SHIFT IS LARGE ENOUGH SUCH THAT ONE OF THE STATES, EITHER HIGH OR LOW DEPENDING ON THE LEVELS OF V1 AND V1b WHEN THE TIA WENT TO CID, IS CANCELED OUT. THE QUANTIZER DOES NOT RECOGNIZE THIS AS A VALID STATE. 4. THE DC OFFSET SLOWLY DISCHARGES UNTIL THE DIFFERENTIAL INPUT VOLTAGE EXCEEDS THE SENSITIVITY OF THE ADN2814. THE QUANTIZER CAN RECOGNIZE BOTH HIGH AND LOW STATES AT THIS POINT. Figure 25. Example of Baseline Wander DC-COUPLED APPLICATION The inputs to the ADN2814 can also be dc-coupled. This might be necessary in burst mode applications, where there are long periods of CIDs, and baseline wander cannot be tolerated. If the inputs to the ADN2814 are dc-coupled, care must be taken not to violate the input range and common-mode level require- ments of the ADN2814 (see Figure 26 through Figure 28). If dc coupling is required, and the output levels of the TIA do not adhere to the levels shown in Figure 27, then level shifting and/or an attenuator must be between the TIA outputs and the ADN2814 inputs. 50 Ω 0.1 µF 50 Ω 3k Ω NIN PIN ADN2814 2.5V VREF 50 Ω 50 Ω TIA VCC Figure 26. DC-Coupled Application PIN VPP = PIN – NIN = 2 × VSE = 10mV AT SENSITIVITY VSE = 5mV MIN VCM = 2.3V MIN (DC-COUPLED) NIN Figure 27. Minimum Allowed DC-Coupled Input Levels PIN VPP = PIN – NIN = 2 × VSE = 2.0V MAX VSE = 1.0V MAX VCM = 2.3V (DC-COUPLED) NIN Figure 28. Maximum Allowed DC-Coupled Input Levels |
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