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AD12401 Fiches technique(PDF) 9 Page - Analog Devices |
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AD12401 Fiches technique(HTML) 9 Page - Analog Devices |
9 / 28 page AD12401 Rev. A | Page 9 of 28 Table 7. Output Coding (Twos Complement) AIN (V) Code KWS JWS Digital Output 4095 +1.6 +0.8 0111 1111 1111 . . . . . . . . . . . . 2048 0 0 0000 0000 0000 2047 −0.000781 to +0.0003905 1111 1111 1111 . . . . . . . . 0 −1.6 to +0.8 1000 0000 0000 Table 8. Option Pin List with Necessary Associated Circuitry Pin Name Active High Logic Level Type Default Level Associated Circuitry Within Part RESET Low LVTTL High 3.74 kΩ Pull-Up DR_EN High LVTTL High Weak Pull-Up (>16 kΩ) ENCODE 100 Ω 100 Ω 100 Ω 100 Ω 3.3V 3.3V PECL DRIVER ENCODE Figure 2. ENCODE Equivalent Circuit ENC 400MHZ DRA DRB DRB DRA DATA OUT B DR_EN 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 DR_EN. 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 DR_EN PIN IS USED TO SYNCHRONIZE THE COLLECTION OF DATA INTO EXTERNAL BUFFER MEMORIES. THE DR_EN PIN CAN BE APPLIED SYNCHRONOUSLY OR ASYNCHRONOUSLY TO THE AD12401. IF APPLIED ASYNCHRONOUSLY, DR_EN MUST BE HELD LOW FOR A MINIMUM OF 5ns TO ENSURE CORRECT OPERATION. THE FUNCTION SHUTS OFF DRA AND DRB UNTIL THE DR_EN PIN IS SET HIGH AGAIN. DRA AND DRB RESUME ON THE NEXT VALID DRA AFTER DR_EN IS RETURNED HIGH. IF THIS FEATURE IS NOT REQUIRED, TIE THIS PIN TO 3.3V THROUGH A 3.74k Ω RESISTOR OR LEAVE IT FLOATING. NOTES Figure 3. Timing Diagram tPD tVD ENC DATA OUT DR ENC DR tEDR Figure 4. Highlighted Timing Diagram |
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Description similaire - AD12401 |
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