CLOCK CORE
About the CLOCK CORE PCB
CLOCK CORE is an open source PCB design by Han-ZenX, published on GitHub under the Custom license license. It is a 4-layer board measuring 70 × 70 mm, with 131 components from 38 distinct parts.
Other key parts include the OCXO_20x20mm, OCXO_25.4x25.4mm, TPS7A5201RPSR, LMK5B12204 and REF5040. By type, the board carries 59 capacitors, 39 resistors, 7 inductors, 6 ICs, 5 diodes and 3 connectors.
From the project
High-precision frequency meter clock generation module
本模块是高精度频率计的后端标准时钟产生系统，为频率测量提供超稳定的时间基准信号。采用 TI 高端时钟发生器芯片 LMK5B12204 和 LMK1C1102，实现超低相位噪声和高精度的时钟输出，适用于精密测试测量、通信系统、雷达电子战等对时钟质量要求极高的应用场景。
- ✅ 超低相位噪声：专业级时钟性能，满足苛刻的频谱纯度要求 - ✅ 多路可编程输出：支持 4 路独立可编程差分时钟输出（LVDS/PECL） - ✅ 高分辨率频率合成：支持 1Hz-3.3GHz 范围内任意频率设定 - ✅ 参考源冗余切换：双参考输入 + 自动切换，确保时钟连续性 - ✅ 低抖动性能：<0.2ps RMS 抖动，提供精准时序基准 - ✅ EEPROM 存储：配置断电保存，上电自启动 - ✅ 硬件级稳定性：工业级设计，宽温工作范围
- 核心电压：3.3V ±5% - 功耗：典型 1.2W - 电源抑制比：>60dB
Main components on the CLOCK CORE
CLOCK CORE bill of materials (BOM)
131 components, 38 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | OCXO_20x20mm | OCXO_20x20mm | U1 |
| 1 | OCXO_25.4x25.4mm | DOPFITKR2-10M | U2 |
| 2 | TPS7A5201RPSR Texas Instruments | TPS7A5201RPSR | U3, U4 |
| 1 | LMK5B12204 | VQFN-48-1EP_7x7mm_P0.5mm_EP5.15x5.15mm_ThermalVias | U5 |
| 1 | REF5040 Texas Instruments | REF5040 | U6 |
| 1 | LAIL-PHC2_54-2P-01-XH-L LAILAN | LAIL-PHC2_54-2P-01-XH-L | CN1 |
| 1 | Conn_Coaxial | SMA_Amphenol_132134-11_Vertical | J1 |
| 1 | Conn_01x04_Socket | PinHeader_1x04_P2.54mm_Vertical | J3 |
| 1 | BSMD1206C-1300T BHFUSE | BSMD1206C-1300T | F1 |
| 1 | HX_PH254-01-03-Z-L11_5_PCB_PIN_HEADER hanxia | HX_PH254-01-03-Z-L11_5_PCB_PIN_HEADER | H1 |
| 10 | KH-IPEX-K501-29 Shenzhen Kinghelm Elec | KH-IPEX-K501-29 | RF1, RF2, RF3, RF4, RF5, RF6, RF7, RF8 +2 |
| 5 | LED | LED_0603_1608Metric | D1, D2, D3, D4, D5 |
| 7 | 220 ohm@100mhz | L_0603_1608Metric | FB1, FB2, FB3, FB4, FB5, FB6, FB7 |
| 34 | 100nF | C_0402_1005Metric | C1, C2, C3, C4, C5, C6, C7, C8 +26 |
| 5 | 10uF | C_0603_1608Metric | C12, C14, C18, C56, C58 |
| 4 | 22uF | C_0805_2012Metric | C16, C17, C23, C24 |
| 2 | 10nF | C_0402_1005Metric | C20, C25 |
| 1 | TAJB107M010RNJ -- | TAJB107M010RNJ | C22 |
| 9 | 10uF | C_0402_1005Metric | C27, C28, C29, C33, C36, C39, C42, C47 +1 |
| 1 | 470nF | C_0402_1005Metric | C30 |
Show 18 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 2 | 1uF | C_0402_1005Metric | C41, C44 |
| 1 | 1uF | C_0603_1608Metric | C57 |
| 8 | 49.9 | R_0402_1005Metric | R1, R2, R4, R5, R7, R8, R10, R11 |
| 4 | DNP | R_0402_1005Metric | R3, R6, R9, R12 |
| 2 | 1K | R_0402_1005Metric | R13, R14 |
| 1 | 3296W-1-103_C48997937 jieerrui | 3296W-1-103_C48997937 | R15 |
| 2 | 12.1K | R_0402_1005Metric | R16, R21 |
| 2 | 3.87K | R_0402_1005Metric | R17, R22 |
| 2 | 100K | R_0402_1005Metric | R18, R23 |
| 1 | 0 | R_0805_2012Metric | R19 |
| 1 | DNP | R_0805_2012Metric | R20 |
| 9 | 0 | R_0402_1005Metric | R24, R31, R32, R33, R34, R35, R36, R37 +1 |
| 1 | 10K | R_0603_1608Metric | R25 |
| 2 | 4.7K | R_0603_1608Metric | R26, R27 |
| 1 | 10R | R_0603_1608Metric | R28 |
| 1 | 0R | R_0603_1608Metric | R29 |
| 1 | 0R | R_0402_1005Metric | R30 |
| 1 | 0R | R_0805_2012Metric | R39 |
CLOCK CORE design files
The KiCad project lives in the Han-ZenX/CLOCK repository on GitHub; these links point at the commit this page was built from.
CLOCK CORE: common questions
How big is the CLOCK CORE PCB?
The CLOCK CORE measures 70 × 70 mm, has 4 copper layers and is 1.5942 mm thick.
How many components are on the CLOCK CORE?
131 components, from 38 distinct parts. The full bill of materials is listed on this page.
Where can I download the CLOCK CORE design files?
From the Han-ZenX/CLOCK repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the CLOCK CORE design in my own project?
It is published under Custom license, which limits how it may be reused; read the license before building on it.
