DDS02.1-W015-DA​01-01-FW
您可以将每个D/A转换器（DAC）连接到10 V的内部参考电压或连接到I/O连接器上外部参考（EXTREF）引脚的外部参考信号。施加到EXTREF的该信号应在±11 V范围内。您可以配置每个通道以使用内部或外部参考。默认参考值选择为内部参考。模拟输出寄存器选择在正常操作中，DAC输出在使用新值更新时会出现小故障。故障能量因代码而异，在频谱中表现为失真。每个模拟输出通道都包含一个reglitch电路，该电路在每个代码处产生均匀的小故障能量，而不是在主要代码转换处产生大的小故障。这种均匀的小故障能量在频谱中显示为更新率的倍数。请注意，此reglitch电路并不能消除故障；这只会使它们的大小更加均匀。默认情况下，所有通道都禁用重新登录，但您可以使用NI-DAQ为每个通道单独启用重新登录。数字输入/输出设备包含八行通用数字输入/输出。您可以单独使用软件配置每一行的输入或输出。在系统启动和复位时，数字输入/输出端口均为高阻抗。通用计数器0和1的硬件上/下控制分别连接到DIO6和DIO7上。因此，您可以使用DIO6和DIO7来控制通用计数器。上升/下降控制信号仅为输入信号，不影响

You can connect each D/A converter (DAC) to the internal reference of 10 V or to the external reference signal connected to the external reference (EXTREF) pin on the I/O connector. This signal applied to EXTREF should be within ±11 V. You can configure each channel to use either internal or external reference. The default reference value selection is internal reference. Analog Output Reglitch Selection In normal operation, a DAC output will glitch whenever it is updated with a new value. The glitch energy differs from code to code and appears as distortion in the frequency spectrum. Each analog output channel contains a reglitch circuit that generates uniform glitch energy at every code rather than large glitches at the major code transitions. This uniform glitch energy appears as a multiple of the update rate in the frequency spectrum. Notice that this reglitch circuit does not eliminate the glitches; it only makes them more uniform in size. By default, reglitching is disabled for all channels, however you can use NI-DAQ to independently enable reglitching for each channel. Digital I/O The device contains eight lines of digital I/O for general-purpose use. You can individually software-configure each line for either input or output. At system startup and reset, the digital I/O ports are all high impedance. The hardware up/down control for general-purpose counters 0 and 1 are connected onboard to DIO6 and DIO7, respectively. Thus, you can use DIO6 and DIO7 to control the general-purpose counters. The up/down control signals are input only and do not affect the operation of the