In high-speed data acquisition (DAQ) cards, the stability and precision of the clock signal are critical to data sampling and transmission. Differential crystal oscillators, known for their low noise, high immunity to interference, and excellent stability, are widely used in high-speed data acquisition systems. They provide reliable clock support especially in applications requiring high sampling rates and high bandwidth.
1. Advantages of Differential Oscillators
>> Low Phase Noise: Minimizes clock jitter, ensuring high-precision sampling.
>> Strong Anti-Interference Capability: Maintains signal integrity over long-distance transmission and in electromagnetically noisy environments.
>> High Signal Quality: Ideal for high-speed data transmission and high-bandwidth requirements, particularly suited for multi-channel synchronous sampling.
2. Application Scenarios
Depending on the requirements of various internal modules within a high-speed DAQ card, differential oscillators play a critical role in the three key scenarios outlined below. Common frequencies are also provided:
|
Application Scenario |
Core Function |
Common Frequencies |
Technical Notes |
|
FPGA High-Speed Transceiver Reference Clock |
Provides the reference clock for GTH/GTX transceivers within the FPGA, used for high-speed uplink data transmission such as PCIe and 10 Gigabit Ethernet. |
100MHz |
• 100MHz: Standard reference frequency for computer buses like PCIe and SATA. |
|
High-Speed ADC/DAC Sampling Clock |
Directly determines the sampling rate. Provides precise, low-jitter clock edges, ensuring high-fidelity conversion from analog to digital signals. |
250MHz |
• 250MHz: Commonly used for JESD204B/C high-speed data converter interfaces. |
|
Multi-Channel Synchronous Clock Tree |
Serves as the core reference source for the clock buffer/distributor chip in multi-channel acquisition cards. After distribution, it drives all ADCs to operate synchronously, ensuring consistency across channels. |
100MHz |
• 100MHz: General-purpose high-precision PLL reference source. |
3. Differential Oscillators from Hangjing
HCI differential oscillators are widely adopted in data acquisition systems. We offer these oscillators in four package sizes - 7050, 5032, 3225, and 2520 - and with three different output types - LVDS, LVPECL, and HCSL - providing flexible options to suit various customer design requirements.
HCI can provide matching solutions and free samples. If needed, please contact your dedicated sales or technical representative.