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ADN2816 Datasheet(PDF) 21 Page - Analog Devices

Part No. ADN2816
Description  Continuous Rate 10 Mb/s to 675 Mb/s Clock and Data Recovery IC
Download  24 Pages
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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ADN2816 Datasheet(HTML) 21 Page - Analog Devices

 
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Data Sheet
ADN2816
Rev. C | Page 21 of 24
50
50
PIN
VREF
NIN
CIN
COUT
COUT
V1
CIN
V1b
V2
V2b
TIA
BUFFER
CDR
+
VCC
DATAOUTP
DATAOUTN
1
V1
V1b
V2
V2b
VDIFF
23
4
VREF
VTH
ADN2816
VDIFF = V2–V2b
VTH = ADN2816 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 ADN2816. THE
QUANTIZER CAN RECOGNIZE BOTH HIGH AND LOW STATES AT THIS POINT.
Figure 21. Example of Baseline Wander


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