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AD12400 Scheda tecnica(PDF) 6 Page - Analog Devices |
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AD12400 Scheda tecnica(HTML) 6 Page - Analog Devices |
6 / 24 page 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 |
Codice articolo simile - AD12400_15 |
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Descrizione simile - AD12400_15 |
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