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AD12400KWS bảng dữ liệu(PDF) 7 Page - Analog Devices

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AD12400
Rev. 0 | Page 7 of 28
Table 4. Output Coding (Twos Complement)
Code
AIN (V)
Digital Output
4095
+1.6
0111 1111 1111
.
.
.
.
.
.
.
.
.
2048
0
0000 0000 0000
2047
−0.000781
1111 1111 1111
.
.
.
.
.
.
0
−1.6
1000 0000 0000
Table 5. Option Pin List With Necessary Associated Circuitry
Pin Name
Active
High or
Low
Logic
Level
Type
Default
Level
Associated
Circuitry
Within Part
RESET
Low
LVTTL
High
3.74 kΩ Pull-Up
LEAD/LAG
Low
LVTTL
Low
10 kΩ − 60 kΩ
Pull-Down
ENCODE
100
ENCODE
100
100
100
3.3V
3.3V
PECL
DRIVER
Figure 2. Encode Equivalent Circuit
ENCODE
400MHZ
DRA
DRB
DRB
DRA
DATA OUT B
LEAD LAG
DATA OUT A
*DATA LOST DUE TO ASSERTION OF LEAD/LAG. LATENCY OF 40 ENCODE CLOCK CYCLES BEFORE DATA VALID.
N – 40
N– 1
N – 39
N
N
N + 2
N + 1
N + 1
N + 2
N + 3
N + 3
N + 5
N + 7
N + 4
N + 6
N + 8
1/fS
tEL
tEH
*
*
40 CLOCK CYCLES
NOTES:
1 IF A SINGLE-ENDED SINEWAVE IS USED FOR ENCODE, USE THE "ZERO CROSSING" POINT (AC-COUPLED) AS THE 50%
POINT AND APPLY THE SAME TIMING INFORMATION.
2 THE LEAD/LAG PIN IS USED TO SYNCHRONIZE THE COLLECTION OF DATA INTO EXTERNAL BUFFER MEMORIES. THE
LEAD/LAG PIN CAN BE APPLIED SYNCHRONOUSLY OR ASYNCHRONOUSLY TO THE AD12400. IF APPLIED
ASYNCHRONOUSLY, LEAD/LAG MUST BE HELD HIGH FOR A MINIMUM OF 5ns TO ENSURE CORRECT OPERATION. THE
FUNCTION WILL SHUT OFF DRA AND DRB UNTIL THE LEAD/LAG PIN IS RELEASED. DRA AND DRB WILL RESUME ON THE
NEXT VALID DRA AFTER LEAD/LAG IS RELEASED.
Figure 3. Timing Diagram
tPD
tV
ENC
DATA OUT
DR
ENC
DR
Figure 4. Highlighted Timing Diagram


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