National Instruments 778950-01 Digital Waveform Generator

Part Number 778950-01 is the identifying part number for the National Instruments PCI-6551 Digital Waveform Generator. The 778950-01 features 20 data channels, 4 PFI (Programmable Function Interface) channels, 3 input clock terminals, and 2 output clock terminals. For signal generation, the module uses data channels for data transmission, the DDC CLK OUT for synchronization, and PFI channels for additional control signals. Likewise, for signal acquisition, the data channels are used for acquiring digital data, while the STROBE channel and the PFI channels are used for timing and control functions respectively. 

The 778950-01 can use multiple clock sources. First, the onboard clock is an internal voltage-controlled crystal oscillator with a frequency range of 48 Hz to 50 MHz. Likewise, an external clock can be connected via the CLK IN connector, which is an SMB jack. The frequency range for this type of clock is 20 kHz to 50 MHz. Lastly, the STROBE signal can be used as a clock source during data acquisition. It can operate within a frequency range of 48 Hz to 50 MHz.

The onboard memory size for the 778950-01 depends on the channel configuration. When 1 Mbit/channel configuration is used, the total memory size for both acquisition and generation channels is 4 MBytes. Likewise, when 8 Mbit/channel and 64 Mbit/channel, the total memory size reaches a total of 32 MBytes and 256 MBytes respectively. The 778950-01 draws 2.0 A (max) of current at +3.3 V. Likewise, it draws 1.8 A (typical) to 2.4 A (maximum) of current at +5V. Furthermore, it draws 0.3 A (typical) to 0.5 A (maximum) of current at +12 V and 0.2 A at -12 V. The total power is typically 21.6 W, which can reach a maximum of 27 W. 

The 778950-01 is recommended for operation between temperatures of 0 °C to 45 °C with a relative humidity of 10% to 90%. On the other hand, it can be stored between a wider temperature range of –20 °C to 70 °C at a 
relative humidity of 5% to 95%.