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数据搜索系统，热门电子元器件搜索 |
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NRF51822-CFAB-R 数据表(PDF) 41 Page - Nordic Semiconductor |
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NRF51822-CFAB-R 数据表(HTML) 41 Page - Nordic Semiconductor |
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41 / 130 page  Page 41 nRF51822 Product Specification v3.3 8.1.2 16 MHz crystal oscillator (16M XOSC) Table 22 16 MHz crystal oscillator Symbol Description Note Min. Typ. Max. Units Test level fNOM,X16M Crystal frequency. 16 MHz N/A fTOL,X16M Frequency tolerance.1 1. The Frequency tolerance relates to the amount of time the radio can be in transmit mode. See Table 38 on page 52. ±502 2. Includes initial tolerance of the crystal, drift over temperature, aging, and frequency pulling due to incorrect load capac- itance. ppm N/A fTOL,X16M,BLE Frequency tolerance, Bluetooth low energy applications.1 ±402 ppm N/A RS,X16M Equivalent series resistance. C0 ≤ 7 pF, CL,MAX ≤ 16 pF C0 ≤ 5 pF, CL,MAX ≤ 12 pF C0 ≤ 3 pF, CL,MAX ≤ 12 pF 50 75 100 100 150 200 Ω Ω Ω N/A N/A N/A PD,X16M Drive level. 100 μW N/A Cpin Input capacitance on XC1 and XC2 pads. 4 pF 1 IX16M Run current for 16 MHz crystal oscillator. SMD 2520 CL = 8 pF 4703 3. This number includes the current used by the automated power and clock management system. μA 1 IX16M,1M Run current for the 16 MHz crystal oscillator when used only for a Timer at 1 MHz or less. SMD 2520 CL = 8pF 2503 μA 1 ISTBY,X16M Standby current for 16 MHz crystal oscillator.4 4. Standby current is the current drawn by the oscillator when there are no resources requesting the 16M, meaning there is no clock management active (see Table 33 on page 49). This value will depend on type of crystal. SMD 2520 CL = 8 pF 25 μA 1 ISTART,XOSC Startup current for 16 MHz crystal oscillator. 1.1 mA 3 tSTART,XOSC Startup time for 16 MHz crystal oscillator. SMD 2520 CL = 8 pF 400 5005 5. Crystals with other specification than SMD 2520 may have much longer startup times. μs 2 tSTART,X16M Total startup time (tSTART,XOSC + debounce period). 6 6. This is the time from when the crystal oscillator is powered up until its output becomes available to the system. It includes both the crystal startup time and the debounce period. SMD 2520 CL = 8 pF 800 μs 1 VINEXTCLK Input amplitude if driven by external clock applied to XC1 pin.7 7. Leave XC2 pin unconnected. 800 8 8. Input signal must not swing outside supply rails. mV pp 1 |
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