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AD12400 Scheda tecnica(PDF) 6 Page - Analog Devices

Il numero della parte AD12400
Spiegazioni elettronici  12-Bit, 400 MSPS A/D Converter
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Produttore elettronici  AD [Analog Devices]
Homepage  http://www.analog.com
Logo AD - Analog Devices

AD12400 Scheda tecnica(HTML) 6 Page - Analog Devices

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AD12400
Rev. A | Page 6 of 24
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
High
ENC
100
Ω
100
Ω
100
Ω
100
Ω
3.3V
3.3V
PECL
DRIVER
ENC
Figure 2. Encode Equivalent Circuit
ENC
400MHZ
DRA
DRB
DRB
DRA
DATA OUT B
LEAD LAG
DATA OUT A
N – 74
N– 1
N – 73
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
1
1
74 CLOCK CYCLES
1. DATA LOST DUE TO ASSERTION OF LEAD/LAG. LATENCY OF 74 ENCODE CLOCK CYCLES BEFORE DATA VALID.
2. IF A SINGLE-ENDED SINE WAVE IS USED FOR ENCODE, USE THE ZERO CROSSING POINT (AC-COUPLED) AS
THE 50% POINT AND APPLY THE SAME TIMING INFORMATION.
3. 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 LOW FOR A MINIMUM OF 5ns TO ENSURE CORRECT OPERATION.
THE FUNCTION SHUTS OFF DRA AND DRB UNTIL THE LEAD/LAG PIN IS SET HIGH AGAIN. DRA AND DRB RESUME
ON THE NEXT VALID DRA AFTER LEAD/LAG IS RETURNED HIGH. IF THIS FEATURE IS NOT REQUIRED, TIE THIS
PIN TO 3.3V THROUGH A 3.74k
Ω RESISTOR.
NOTES
Figure 3. Timing Diagram
tPD
tV
ENC
DATA OUT
DR
ENC
DR
Figure 4. Highlighted Timing Diagram


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