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The NI 5772 clock source controls the sample rate and other timing functions on the device. The following table contains information about the possible NI 5772 clock sources.

Table 1. NI 5772 Clock Sources
Clock Source Frequency [1] Description
Internal Free-Running Sample Clock 800 MHz The internal Sample Clock is free-running.
Internal Sample Clock PLL On (IoModSyncClock) 800 MHz The internal Sample Clock locks to IoModSyncClock, which is provided only though the backplane of NI PXIe-796xR devices.
Internal Sample Clock PLL On (REF IN) 800 MHz The internal Sample Clock locks to an external 10 MHz Reference Clock, which is provided through the REF IN front panel connector.
External Sample Clock (CLK IN) 400 MHz to 800 MHz An external Sample Clock can be provided through the CLK IN front panel connector.
Note  

Do not connect an external Sample Clock with a frequency greater than 800 MHz to the CLK IN front panel connector to acquire data at rates greater than 800 MS/s. Instead, use an external clock with a frequency between 400 MHz and 800 MHz and configure the CLIP to use TIS.

You can configure the NI 5772 to use a variety of sampling modes. By default, the NI 5772 takes samples at 800 MS/s through both analog input channels; however, you can take samples through one analog input channel to increase the sample rate. The table below lists the sampling modes available on the NI 5772.
Table 2. Sampling Modes
Mode Sample Rate (MS/s) Full-Scale Input Power Range (dBm) Number of Channels Connection Description
TIS Disabled (default) 400 to 800 10 2 Use both CH 0 and CH 1. The device samples both channels simultaneously.
TIS Enabled, Multiplexed to CH 0 800 to 1,600 10 1 Use only CH 0. Disconnect or terminate unused channels.
TIS Enabled, Multiplexed to CH 1 800 to 1,600 10 1 Use only CH 1. Disconnect or terminate unused channels.
TIS Enabled, Non-Multiplexed [2] 800 to 1,600 16 1 Use CH 0 or CH 1. You can only use one channel. You must terminate the unused channel with the 50 Ω terminator.
  • 1 You can use TIS to acquire up to 1.6 GS/s. Refer to the NI FlexRIO Help for more information about configuring your NI 5772 CLIP.
  • 2 This sampling mode is available in the AC-coupled version only.