描述
RSR CSAC模块是JLT制造的超小型、低成本的CSAC模块。商用版设计为直接插入客户的PCB，或使用电缆线束进行连接。该模块由可选的外部1PPS源或可选的外部GNSS接收机驯服。SAASM版本还具有与Rockwell RSR SAASM精灵接收机兼容的外形匹配，并且可以安装在RSR精灵下方，为流行的Rockwell RSR精灵添加CSAC GPSDO保持功能。该模块的工作电压为2.5V至5.5V，功耗极低，通常小于0.38W。该模块包含一个20皮秒分辨率的双输入时间戳电路，用于从两个独立和可选的USB连接外部1PPS源和RS-232连接的外部GNSS接收机进行驯服。该模块被屏蔽以提供额外的EMI保护。
特点
- 占位面积非常小
- 成本低的CSAC
- 兼容u-blox GNSS和Rockwell SAASM接收机
- 带有软件CSAC老化校正的保持模块
- 使用5V、3.0V、3.3V或5V电源或锂离子电池运行
技术参数
| Module Specification: | ||||
| Long-Term Oscillator Aging (without GPS – no aging with ext. reference) | Less than 0.3ppb per month in Holdover without ext. reference | |||
| Frequency Stability Over Temperature | Better than ±0.5E-09 (CSAC only, no Disciplining, 0°C to +70°C) | |||
| 1 PPS Accuracy | <5ns to ext. 1PPS RMS (1-Sigma) steady-state | |||
| Frequency Accuracy | Better than ±2E-010 after 3 minutes operation to ext. reference | |||
| Holdover Drift (after 5 minute warmup with ext. reference lock) | <±2.5us drift per hour over worst case temperature range | |||
| Typical Holdover Drift (after 5 minute warmup with ext. reference lock) | <±1us drift per hour at 25°C ±5°C | |||
| ADEV (with ext. reference lock) | 1s: <1E-10, 10s: <2.5E-11, 100s <2E-11, 1Ks: <1E-11, 10Ks: <2E-12 | |||
| 1 PPS Output (CSAC Flywheel Generated) | 3.3V CMOS output | |||
| 10MHz Outputs | 10MHz CMOS 3.3V | |||
| RS-232 control ports | Independent RS-232 ports for SCPI/NMEA and external GNSS Receiver | |||
| RS-232 and TTL NMEA Output Sentences | NMEA 0183 rev. 2.3, Sentences: GGA, RMC, ZDA, PASHR, and others | |||
| External SAASM GPS disciplining option | Glue-less control of optional Rockwell Collins RSR Puck SAASM receivers | |||
| External GNSS disciplining option | Glue-less control and monitoring of uBlox 6,7,8 receivers | |||
| TTL Alarm Output | Hardware Event Indicator | |||
| Warm Up Time / Stabilization Time (CSAC Atomic Lock) | <180s at +25°C to <5E-010 Accuracy Typ. | |||
| Supply Voltage (Vdd) | +2.3V to +5.5V (e.g. 2.5V, 3.0V, 3.3V, 5V) | |||
| Power Consumption | 0.39W at 5.0V, 0.41W at 3.3V | |||
| Operating Temperature | -10C to +70C | |||
| g-sensitivity | <0.2ppb per-g per-axis | |||
| Magnetic Sensitivity | Less than 0.4ppb per Gauss | |||
| Storage Temperature | -25°C to +70°C | |||
| MTBF | > 100,000 Hours at +40C | |||
| Connectors | Samtec board-to-board, or Hirose board-to-cable | |||
| Phase Noise | 10Hz | -75dBc/Hz | ||
| 100Hz | -115dBc/Hz | |||
| 1KHz | -128dBc/Hz | |||
| 10kHz | -134dBc/Hz | |||
| 100kHz | -140dBc/Hz | |||
| Applications: | Glue-less Plug-In Timing and Frequency reference with Atomic Clock | |||
| CSAC Module upgrade for Rockwell Collins RSR SAASM Puck | ||||
| Low-Power high-reliability Glue-Less CSAC module | ||||
| Atomic Frequency Standard with optional external 1PPS input | ||||
