NI-9775 Getting Started

NI-9775 Block Diagram

Figure 1. NI-9775 Block Diagram, Single Channel

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  • The shell of the BNC connects to CHASSIS GND.
  • The four channels of the NI-9775 share the clock circuit and operate simultaneously.
  • The NI-9775 has two separate data engines operating simultaneously for each channel: the continuous stream engine and triggered record engine.
  • The module waits for a trigger event, fills the circular buffer with the configured set of data (called a record), then streams the entire record from the module to the chassis.
  • The analog filter allows you to select 10 MHz or 5 MHz bandwidth.
  • The software-selectable digital decimation filter improves resolution and alias rejection.
  • The ADC samples the analog signal continuously at 20 MS/s.

NI-9775 Timing Modes

The NI-9775 has two timing modes: high-speed and high-resolution.

High-speed mode turns off the digital decimation filter on all channels and enables you to set the analog filter per channel.

High-resolution mode turns on both the analog filter and digital decimation filter for all channels.

Acquisition Modes

The NI-9775 has three acquisition modes: continuous mode, record mode, and advanced mode.

In continuous mode, the NI-9775 transfers real-time data to the chassis at an aggregate rate of 4 MS/s across all channels.

In record mode, the NI-9775 stores samples into onboard memory at up to 20 MS/s then transfers the data to the chassis at a slower rate.

In advanced mode, the NI-9775 combines the functionality of continuous mode and record mode to enable more complex triggering schemes based on the continuous data.

Note Advanced mode is only available on CompactRIO systems.

NI-9775 Pinout


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Table 1. Signal Descriptions
Signal Description
AI Analog input signal connection
CHASSIS GND Chassis ground connection

Single-Ended Connections


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NI-9775 Connection Guidelines

Make sure that devices you connect to the NI-9775 are compatible with the module specifications.