
ADC12D1800RF
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SNAS518I –JULY 2011–REVISED JANUARY 2014
6.2.2 Extended Control Mode ........................................................................................ 44
6.2.2.1 The Serial Interface ................................................................................ 44
6.3 FEATURES ................................................................................................................. 46
6.3.1 Input Control and Adjust ....................................................................................... 47
6.3.1.1 AC/DC-coupled Mode ............................................................................. 47
6.3.1.2 Input Full-Scale Range Adjust .................................................................... 47
6.3.1.3 Input Offset Adjust ................................................................................. 48
6.3.1.4 DES/Non-DES Mode .............................................................................. 48
6.3.1.5 DES Timing Adjust ................................................................................. 48
6.3.1.6 Sampling Clock Phase (Aperture) Delay Adjust ............................................... 49
6.3.2 Output Control and Adjust ..................................................................................... 49
6.3.2.1 SDR / DDR Clock .................................................................................. 49
6.3.2.2 LVDS Output Differential Voltage ................................................................ 50
6.3.2.3 LVDS Output Common-Mode Voltage .......................................................... 50
6.3.2.4 Output Formatting .................................................................................. 50
6.3.2.5 Demux/Non-demux Mode ......................................................................... 50
6.3.2.6 Test Pattern Mode ................................................................................. 51
6.3.2.7 Time Stamp ......................................................................................... 52
6.3.3 Calibration Feature ............................................................................................. 52
6.3.3.1 Calibration Control Pins and Bits ................................................................ 52
6.3.3.2 How to Execute a Calibration .................................................................... 52
6.3.3.3 Power-on Calibration .............................................................................. 53
6.3.3.4 On-command Calibration ......................................................................... 53
6.3.3.5 Calibration Adjust .................................................................................. 53
6.3.3.6 Read / Write Calibration Settings ................................................................ 54
6.3.3.7 Calibration and Power-Down ..................................................................... 54
6.3.3.8 Calibration and the Digital Outputs .............................................................. 54
6.3.4 Power Down ..................................................................................................... 54
6.4 Applications Information .................................................................................................. 55
6.4.1 THE ANALOG INPUTS ........................................................................................ 55
6.4.1.1 Acquiring the Input ................................................................................. 55
6.4.1.2 Driving the ADC in DES Mode ................................................................... 55
6.4.1.3 FSR and the Reference Voltage ................................................................. 56
6.4.1.4 Out-Of-Range Indication .......................................................................... 56
6.4.1.5 Maximum Input Range ............................................................................ 56
6.4.1.6 AC-coupled Input Signals ......................................................................... 56
6.4.1.7 DC-coupled Input Signals ......................................................................... 57
6.4.1.8 Single-Ended Input Signals ....................................................................... 57
6.4.2 THE CLOCK INPUTS .......................................................................................... 58
6.4.2.1 CLK Coupling ....................................................................................... 58
6.4.2.2 CLK Frequency ..................................................................................... 58
6.4.2.3 CLK Level ........................................................................................... 58
6.4.2.4 CLK Duty Cycle .................................................................................... 58
6.4.2.5 CLK Jitter ............................................................................................ 59
6.4.2.6 CLK Layout ......................................................................................... 59
6.4.3 THE LVDS OUTPUTS ......................................................................................... 59
6.4.3.1 Common-mode and Differential Voltage ........................................................ 59
6.4.3.2 Output Data Rate .................................................................................. 59
6.4.3.3 Terminating Unused LVDS Output Pins ........................................................ 60
6.4.4 SYNCHRONIZING MULTIPLE ADC12D1800RFS IN A SYSTEM ....................................... 60
6.4.4.1 AutoSync Feature .................................................................................. 60
6.4.4.2 DCLK Reset Feature .............................................................................. 61
6.4.5 SUPPLY / GROUNDING, LAYOUT AND THERMAL RECOMMENDATIONS ......................... 62
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