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| EPF20K200EQC240-3资料 | |
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EPF20K200EQC240-3 PDF Download |
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File Size : 116 KB
Manufacturer:ALTERA Description: These outputs provide access to the outputs from the RF and reference dividers and are provided for monitoring purposes during product development or test, and for connection of an external phase detector if required. the output circuit is of ECL type, the circuit diagram being shown in Fig.7g. The outputs can be enabled or disabled under software control by the address 0 control word but are best left in the disabled state when not required as the fast edge speeds on the output can increase the level of reference sidebands on the synthesised oscillator. The emitter follower outputs have no internal pull down resistor to save current and if the outputs are required an external pull down resistor should be fitted.The value should be kept as high as possible to reduce supply current, about 2.2k being suitable for monitoring with a high impedance oscilloscope probe or for driving an AC coupled 50ohm load. A minimum value for the pull down resistor is 330ohms. When the Fpd and Fref outputs are disabled the output level will be at the logic low level of about 3.5V so that the additional supply current due to the load resistors will be present even when the outputs are disabled. |
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| 1PCS | 100PCS | 1K | 10K | ||
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型 号：EPF20K200EQC240-3 厂 家：ALTERA 封 装：QFP 批 号：08+ 数 量：1200 说 明：100%真实库存，原装，部分现货 |
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运 费： 所在地：深圳 新旧程度： |
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| 联系人：陈小姐 |
| 电 话：0755-83605789 |
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| 公司地址： 广东深圳市福田区华强北（振华路）赛格高科德电子市场A1848室 |
