描述
ULN-450和ULN-450A超低噪声100MHz晶体振荡器频率参考设计用于提供大量超低相位噪声100MHz正弦波和LVDS输出，具有非常高的精度和稳定性。在1秒到10秒的平均时间内，小于万亿分之7的Allan偏差和-163dBc/Hz的相位噪声本底是典型的（ULN-450 DOCXO版本）。ULN-450/A模块包括用于晶体老化和温度校正的微处理器控制、极低噪声的内部电源调节器以及可选的1PPS和10MHz输入，用于驯服外部源，如充满噪声的铷振荡器或GPS接收机。
ULN-450/A模块支持用于状态、控制和监测的英文版SCPI（GPIB）接口，还包含TTL LOCK/ALARM状态指示器和用户可选的TTL或RS-232级串行接口。
ULN-450模块包含一个具有低g灵敏度选项的DOCXO 10MHz晶体振荡器，可提供高Allan Deviation性能和低倾斜灵敏度，以及一个100MHz低g超低相位噪声晶体产生100MHz输出（100Hz通常为-120dBc/Hz偏移下），典型的噪声基底为-163dBc/Hz。100MHz晶体与10MHz OCXO锁相，10MHz OCXO可以被可选的外部1PPS或10MHz参考驯服。
ULN-450A模块是成本较低的单层晶体和基于VCXO的版本，适用于对成本敏感的应用。ULN-450A模块还具有略低的机械高度（0.66英寸总高度与0.93英寸总高度），用于机械紧密的应用，如VME机架使用。
ULN-450和450A单元包含4个100MHz正弦波输出、一个LVDS 100MHz输出以及一个LVDS 1PPS输出和输入。
ULN-450有多种选择，如军用温度范围和加固，适用于雷达、卫星通信、无线电、电信和测试设备等应用。
特点
- 具有4个隔离100MHz正弦波输出
- 驯服或无条件运行
- -163dBc/Hz本底噪声，典型值。在100Hz偏移时为-120dBc/Hz
- 5ppm最大老化，超过10年无条件运行（SOCXO）
- 3E-012@1s，6E-012@1s ADEV标准。（DOCXO）
- 集成电源、滤波器和隔离分配放大器
技术参数
ULN-450 PN：1001450
| Module Specification: | ||||
| 1 PPS Accuracy | ±25ns rms to external reference, 16.666ns resolution | |||
| Frequency Accuracy | Better than ±2E-010 to external reference after 20 minutes | |||
| Holdover Stability | <±10us for 3 Hour Period @25°C with 30 minute lock to reference | |||
| ADEV | 1s: <7E-12, 10s: <= 8E-12 | |||
| 1 PPS Outputs (OCXO Flywheel Generated) | LVDS Rising-Edge Aligned, Ultra Low Jitter, Sawtooth removed | |||
| 100MHz Outputs GPO/MMCX | 2x LVDS 100MHz, 4x 100MHz 50 Ohms 6dBm Sine | |||
| RS-232 Control | Full control via SCPI-99 Control Commands, TTL or RS-232 | |||
| External Reference Input | 1PPS LVDS or 10MHz Sine, Auto-switchover or manual select | |||
| TTL Alarm Output | Holdover and Hardware Failure indicator (low active, 3.3V CMOS) | |||
| Warm Up Time / Stabilization Time | <7 min at +25°C to <1E-09 Accuracy Typ. without reference | |||
| Supply Voltage (Vdd) | 13.8V to 15.5V DC, 15V nominal, <=100ms rise-time | |||
| Power Consumption | < 4W at +25°C with DOCXO, steady-state | |||
| Operating Temperature | -55°C to +80°C | |||
| Environmental Conformance | MIL-STD-202, Method 204, Condition I-A | |||
| Storage Temperature, Weight | -55°C to +90°C, < 60 grams | |||
| Oscillator Specification: | ||||
| Frequency Output | 4x 100MHz, GPO connectors, 2x LVDS Samtec connector | |||
| 100MHz Retrace | ±2E-08 After 1 Hour, no reference lock, 24 hours off | |||
| Frequency Stability (low-g, DOCXO option) | ±2.5E-010/temp, ±3E-010/g/axis (10MHz), <±6E-010/g/axis (100MHz) | |||
| Output Amplitude | 6dBm ±1.5dBm | |||
| Frequency adjustment range (SCPI control or to external reference) | >±100Hz @ 100MHz | |||
| Harmonics (Sine Output) | <-45dBc | |||
| Aging | <1ppm in 10 years | |||
| Warm Up Time at -40C | < 5 min to ±3E-8 | |||
| Phase Noise | 100MHz Out | |||
| 1Hz | -65dBc/Hz | |||
| 10Hz | -98dBc/Hz | |||
| 100Hz | -118dBc/Hz | |||
| 1kHz | -146dBc/Hz | |||
| 10kHz | -158dBc/Hz | |||
| 100Khz | -163dBc/Hz | |||
| Designed Lifetime | >10 years | |||
ULN-450A PN：1001450A
| Module Specification: | ||||
| 1 PPS Accuracy | ±35ns rms to external reference, 16.666ns resolution | |||
| Frequency Accuracy | Better than ±8E-010 to external reference after 20 minutes | |||
| Holdover Stability | <±20us/3 Hrs @25.0°C, no airflow or motion, with 2 Hrs reference lock | |||
| ADEV | 1s: <1E-11, 10s: <= 4E-11 | |||
| 1 PPS Outputs (OCXO Flywheel Generated) | LVDS Rising-Edge Aligned, Ultra Low Jitter, Sawtooth removed | |||
| 100MHz Outputs GPO/MMCX | 2x LVDS 100MHz, 4x 100MHz 50 Ohms 6dBm Sine | |||
| RS-232 Control | Full control via SCPI-99 Control Commands, TTL or RS-232 | |||
| External Reference Input | 1PPS LVDS or 10MHz Sine, Auto-switchover or manual select | |||
| TTL Alarm Output | Holdover and Hardware Failure indicator (low active, 3.3V CMOS) | |||
| Warm Up Time / Stabilization Time | <15 min at +25°C to <10E-09 Accuracy Typ. without reference | |||
| Supply Voltage (Vdd) | 13.8V to 15.5V DC, 15V nominal, <=100ms rise-time | |||
| Power Consumption | < 3.2W at +25°C with SOCXO, steady-state | |||
| Operating Temperature | -25°C to +75°C | |||
| Environmental Conformance | MIL-STD-202, Method 204, Condition I-A | |||
| Storage Temperature, Weight | -55°C to +90°C, < 55 grams | |||
| Oscillator Specification: | ||||
| Frequency Output | 4x 100MHz, GPO connectors, 2x LVDS Samtec connector | |||
| 100MHz Retrace | ±5E-08 After 1 Hour, no reference lock, 24 hours off | |||
| Frequency Stability | ±12E-09/temp, ±2.5E-09/g/axis (10MHz), ±3E-09/g/axis (100MHz) | |||
| Output Amplitude | 6dBm ±2dBm | |||
| Frequency adjustment range (SCPI control or to external reference) | >±40Hz @ 100MHz | |||
| Harmonics (Sine Output) | <-45dBc | |||
| Aging | <0.5ppm in 10 years | |||
| Warm Up Time at 25C | < 8 min to ±2E-8 (ref. to frequency after 1 Hr) | |||
| Phase Noise | 100MHz Out | |||
| 1Hz | -65dBc/Hz | |||
| 10Hz | -85dBc/Hz | |||
| 100Hz | -118dBc/Hz | |||
| 1kHz | -140dBc/Hz | |||
| 10kHz | -155dBc/Hz | |||
| 100Khz | -160dBc/Hz | |||
| Designed Lifetime | >10 years | |||
