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index | cn.accusilicon.com Reviews
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Accusilicon updates
t1_usage1
http://cn.accusilicon.com/t1_usage1.html
电源电压可以是2.8伏到3.3伏的直流电压,在使用T1芯片测试板时,如果用2.8伏电压,可以直接从P8002板上的2.8伏电压出口获取,如图中所示,一根RCA转双香蕉头线,香蕉头插在P8002板 红头进红插座,黑头进黑插座 ,RCA插在T1测试板的白色RCA插座上 如果打算测试的TCXO使用2.8伏以外的电压,可以把外接电源通过白色RCA接口供应给T1测试板。 T1芯片的Q引脚有两个功能,一是在T1芯片烧录完成后,输出TCXO的频率信号 clipped sine wave。 在T1芯片烧录之前,Q引脚可以根据VC引脚收到的指令,选择输出芯片内部的电压信号,或者是输出TCXO的频率信号 Q引脚输出的频率信号可以通过频率计 如HP 53131A 测量 Q引脚输出的电压信号,可以通过数字万用表测量,或者P8002板上的电压测量接口测量. VREF, 芯片内部参考电压,目标是1.6伏,如测量出来有偏差,可以通过调整T1内部VREF的参数改变. VCTC, TCXO温度补偿电压,该电压控制压控振荡电路 VCXO 来达到温度补偿的效果.
t1reg_c0
http://cn.accusilicon.com/t1reg_c0.html
Void T1 SetC0(int x);.
t1_3525_1
http://cn.accusilicon.com/t1_3525_1.html
Accusilicon T1芯片 双温度点补偿方法 part 1. Accusilicon的双温度点补偿计算服务器的网址是 west.accusilicon.com. 也就是说,用户只需要向 west.accusilicon.com. TCXOFIT -A3 98.5e-6 -T0 29.7 -FITTYPE 1 -A1 0.285 -TEMP25 25.20 -VREF25 1.562 -V225 1.554 -VCTC25 0.265 -VTST0 0.673 -VTST1 0.376 -VTST2 0.551 -VTST3 0.421 -VTST4 0.382 -VTST5 0.331 -NOPNG 1. A1是石英晶体温度/频率特性的一次项系数 不带正负号 ,该数的理想范围是 0.25到0.35,几乎每个石英晶体的A1参数都不一样,需要测量。 测量方法是,在35度测量一次频率,25度测量一次频率,把两次频率的 频偏(ppm)的差 delta ppm),除以温度差(35-25=10 ,就能获得A1参数值。 Import socket HOST='west.accusilicon.c...
t1_fact
http://cn.accusilicon.com/t1_fact.html
T1温补晶振芯片功耗极低,工作电流1.5毫安,非常适合使用电池的移动通信设备如手机等 用户也可以设置IC工作在更大的工作电流 至6毫安 ,以便获得更低的相噪性能. 针对质量较好的晶体或者较窄的温度范围,还能达到 /-1ppm (-30度到85度)或者 /-0.5ppm(-20度到70度)的稳定度. T1温补晶振芯片输出削峰正弦波频率信号(clipped sine wave),与市场上的主流TCXO产品输出波形完全兼容,用T1芯片制成的温补晶振,可以做到完全pin to pin的替换市场上的主流TCXO产品。
t1_package
http://cn.accusilicon.com/t1_package.html
Accusilicon T1温补晶振IC大小仅为0.85毫米x0.83毫米,可以封装到京瓷(Kyocera)的通用4脚陶瓷晶振底座里面。
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