EPSON differential oscillator empowers data acquisition card, making data more accurate!

Jul 22,2024
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What is a data collection card?

Data collection refers to the automatic collection and transmission of analog or digital signals from the tested equipment to the upper computer for analysis and processing. Data acquisition card, which is a computer expansion card that realizes data acquisition function, can be used through USB PXI、PCI、PCMCIA、ISA、Compact Flash、485、232、 Ethernet, various wireless networks, and other buses are connected to computers.

The image acquisition card samples analog image signals through sampling devices and converts continuous analog signals into discrete digital signals. The sampling rate determines the resolution of the image, and a higher sampling rate can provide finer image details. The sampled analog signal is converted into a digital signal, which is usually done by the digital signal processor (DSP) of the sampling device. In order to save storage space and transmission bandwidth, image capture cards usually compress image data, and common compression algorithms include JPEG, PNG, etc. Compressed image data can be stored on a computer's hard drive or other storage media, or transmitted to other devices through a network.

The role of crystal oscillator in data acquisition card

Provide clock signal: The crystal oscillator provides accurate and stable clock reference for the data acquisition card, ensuring that all aspects of data acquisition are carried out at a unified pace, such as analog-to-digital conversion, data storage, and transmission.

Ensure synchronization of data collection: enable the collection card to accurately collect data at specific time points, ensuring synchronization of data collection across different channels, which is crucial for scenarios that require precise multi-channel measurement and analysis.

Determine sampling frequency: The frequency of the crystal oscillator determines the sampling frequency of data acquisition, thereby affecting the resolution and accuracy of data acquisition. A suitable crystal oscillator can help the acquisition card achieve the required sampling rate.

Improving system stability: A stable clock signal helps reduce errors and uncertainties in the data acquisition process, enhancing the reliability and stability of the entire data acquisition system.

In high-speed data acquisition cards, high-quality differential crystal oscillators can ensure fast and accurate acquisition of large amounts of data; In some professional data acquisition cards that require high precision, high-precision crystal oscillators can ensure that the collected data has higher credibility and usability. For some low-speed data acquisition applications, crystal oscillator frequencies ranging from a few MHz to tens of MHz, such as 4MHz, 8MHz, 16MHz, etc., may be used to meet basic data acquisition rate requirements.

In medium to high-speed data acquisition scenarios, crystal oscillators ranging from tens of MHz to hundreds of MHz, such as 32MHz, 64MHz, 100MHz, 200MHz, etc., may be used to achieve higher data sampling frequencies and better timeliness.

Crystal oscillator selection requirements for data acquisition cards

one、High stability and precision

Ensure the provision of accurate clock signals to achieve precise data acquisition and measurement, reduce time related errors, maintain stable frequency output under different environmental conditions (such as temperature, humidity, etc.), and avoid frequency drift affecting the accuracy and consistency of data acquisition.

two、anti-interference

There are various electromagnetic interference sources in the working environment of graphics cards, such as power supply, current, and other electronic devices. The surface design of metal packaging has a certain anti-interference ability, supporting differential signal output of LVDS/LVPCECL/HCSL, which can easily distinguish small signals and accurately process' bipolar 'signals with ease.

three、Low jitter

Differential has low phase jitter noise characteristics (0.1pS typ.), which can reduce signal distortion and jitter, ensure clear edges of clock signals, and help improve the quality and reliability of data acquisition.

four、Small size

Adapt to the compact design space of the data acquisition card, making it easy to integrate and install.