描述
FireFly-1C GPSDO提供三种GPS驯服的10MHz和100MHz输出，其外形尺寸旨在满足实验室和19英寸机架安装设备的参考要求。基于非常快的预热和非常稳定的TCXO，可提供2个低相位噪声并相互隔离的10MHz正弦波输出和1个低相位噪声的100MHz正弦波输出，均采用SMA连接器。也可为外部提供的可选10MHz基准提供即时锁定功能（锁定范围为+/-40Hz）。切换到外部参考是自动的，并且可通过板载LED或可选的外部LED指示 “REF DETECT” 和“GPS LOCKED” 。FireFly-1C板载支持USB和TTL电平串行端口（RS-232电平是可选的），并具有内置的SCPI和NMEA命令和控制语句，便于集成。FireFly-1C通过USB电源或外部+5V电源运行，USB电源和外部+5V功率可以同时应用以实现冗余，总体典型功耗为1.1W。
特点
- 尺寸：2.5 x 2.8 x 0.55 英寸
- 集成USB，10MHz Ref-In
- 50通道WAAS GPS接收机
- 10MHz和100MHz输出
技术参数
| Module Specification: | |||||
| 1 PPS Accuracy | ±75ns to UTC RMS (1-Sigma) GPS Locked (<20ns typical) | ||||
| Serial Control | GPS NMEA and Status Output, SCPI-99 control, USB Port | ||||
| GPS Frequency | L1, C/A 1574MHz | ||||
| GPS Receiver | 50 Channels, Mobile, SBAS WAAS, EGNOS, MSAS capable | ||||
| Sensitivity | Acquisition –142 dBm, Tracking -158 dBm | ||||
| GPS TTFF | Cold Start – <45 sec, Warm Start – 1 sec, Hot Start – 1 sec | ||||
| ADEV (10MHz outputs) | 1Ks <1E-010, 10Ks <2E-011 (GPS Locked, 25°C, no motion/airflow) | ||||
| TTL Alarm Output | GPS LOCK, EXT REF LOCK, and Event indicator | ||||
| Stabilization Time | <5 min at +25°C to 1E-08 Accuracy to GPS, <2s to external 10MHz Ref | ||||
| Supply Voltage (Vdd) | 5V ±5%, <220mA | ||||
| Power Consumption | 1.1W | ||||
| Operating Temperature | -20°C to +70°C | ||||
| 10MHz External Reference Input | 10MHz TCXO locked to external 10MHz reference with 5Hz loop BW Auto-switchover to EXT IN, EXT REFLOCK LED output 0dBm to +15dBm (+20dBm max level) | ||||
| 10MHz/100MHz outputs | 2x 10MHz at +13dBm, 1x 100MHz at +7dBm, ±3dB | ||||
| 100MHz PLL | 100MHz VCXO Locked to 10MHz TCXO, 8Hz loop BW | ||||
| Oscillator Specification (TCXO): | |||||
| Frequency Output | 10MHz with ±80Hz range from 10MHz nominal adjust range | ||||
| 10MHz Retrace | ±2E-08 After 1 Hour @ +25°C (no GPS) | ||||
| Frequency Stability over Temperature, and over 24hrs | ±1.5E-07 (no GPS), <5E-012 over 24hrs (with GPS) | ||||
| Output Amplitude | +13dBm ±3dBm Sine Wave | ||||
| TCXO aging (fully compensated by GPS) | <±1ppm per year without GPS | ||||
| Phase Noise (10MHz TCXO, 100MHz VCXO) | 10MHz | 100MHz | |||
| 1Hz | -70dBc/Hz | ||||
| 10Hz | -100dBc/Hz | -77dBc/Hz | |||
| 100Hz | -128dBc/Hz | -108dBc/Hz | |||
| 1kHz | -145dBc/Hz | -142dBc/Hz | |||
| 10kHz | -152dBc/Hz | -153dBc/Hz | |||
| 100KHz | <-155dBc/Hz | -160dBc/Hz | |||
| Connections: | Connector Type: | ||||
| 2x 10MHz Sine Wave Out, 10MHz Sine Wave REF Input, 1x 100MHz Sine Wave Out, 1PPS Output | SMA | ||||
| +5V Power, GPS Lock/Event Status, 100MHz PLL lock LED, 10MHz EXT REF lock Status | Molex PN 22-11-2032 | ||||
| USB Power and Communication | Mini USB | ||||
