VREF NIN CIN
參數(shù)資料
型號: ADN2806ACPZ-500RL7
廠商: Analog Devices Inc
文件頁數(shù): 11/20頁
文件大?。?/td> 0K
描述: IC CLK/DATA REC 622MBPS 32-LFCSP
標(biāo)準(zhǔn)包裝: 500
類型: 時(shí)鐘和數(shù)據(jù)恢復(fù)(CDR),多路復(fù)用器
PLL:
主要目的: SONET/SDH
輸入: CML
輸出: LVDS
電路數(shù): 1
比率 - 輸入:輸出: 1:2
差分 - 輸入:輸出: 是/是
頻率 - 最大: 622MHz
電源電壓: 3 V ~ 3.6 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 32-VFQFN 裸露焊盤,CSP
供應(yīng)商設(shè)備封裝: 32-LFCSP-VQ(5x5)
包裝: 帶卷 (TR)
ADN2806
Rev. C | Page 19 of 20
50
PIN
VREF
NIN
CIN
COUT
V1
CIN
V1b
V2
V2b
LIM
BUFFER
CDR
+
DATAOUTP
DATAOUTN
1
V1
V1b
V2
V2b
VDIFF
23
4
VREF
VTH
ADN2806
VDIFF = V2–V2b
VTH = ADN2806 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 V1AND 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 ADN2806.
THE QUANTIZER CAN RECOGNIZE BOTH HIGH AND LOW STATES AT THIS POINT.
0
58
31
-0
27
Figure 21. Example of Baseline Wander
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