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ADN2813ACPZ-RL7 Datasheet(PDF) 23 Page - Analog Devices |
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ADN2813ACPZ-RL7 Datasheet(HTML) 23 Page - Analog Devices |
23 / 28 page ADN2813 Rev. 0 | 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 ADN2813 VDIFF = V2–V2b VTH = ADN2813 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 ADN2813. THE QUANTIZER CAN RECOGNIZE BOTH HIGH AND LOW STATES AT THIS POINT. Figure 26. Example of Baseline Wander DC-COUPLED APPLICATION The inputs to the ADN2813 can also be dc-coupled. This may be necessary in burst mode applications, where there are long periods of CIDs, and baseline wander cannot be tolerated. If the inputs to the ADN2813 are dc-coupled, care must be taken not to violate the input range and common-mode level require- ments of the ADN2813 (see Figure 27 through Figure 29). If dc coupling is required, and the output levels of the TIA do not adhere to the levels shown in Figure 28, then level shifting and/or an attenuator must be between the TIA outputs and the ADN2813 inputs. 50 Ω 0.1 μF 50 Ω 3k Ω NIN PIN ADN2813 2.5V VREF 50 Ω 50 Ω TIA VCC Figure 27. DC-Coupled Application PIN V p-p = PIN – NIN = 2 × V SE = 10mV AT SENSITIVITY VSE = 5mV MIN VCM = 2.3V MIN (DC-COUPLED) NIN Figure 28. Minimum Allowed DC-Coupled Input Levels PIN V p-p = PIN – NIN = 2 × V SE = 2.0V MAX VSE = 1.0V MAX VCM = 2.3V (DC-COUPLED) NIN Figure 29. Maximum Allowed DC-Coupled Input Levels |
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