数据搜索系统,热门电子元器件搜索 |
|
ZL30100 数据表(PDF) 11 Page - Zarlink Semiconductor Inc |
|
ZL30100 数据表(HTML) 11 Page - Zarlink Semiconductor Inc |
11 / 34 page ZL30100 Data Sheet 11 Zarlink Semiconductor Inc. Figure 3 - Reference Monitor Circuit Exceeding the thresholds of any of the monitors forces the corresponding REF_FAIL pin to go high. The single cycle and coarse frequency failure flags force the DPLL into Holdover mode and feed a timer that disqualifies the reference input signal when the failures are present for more than 2.5 s. The single cycle and coarse frequency failures must be absent for 10 s to let the timer requalify the input reference signal as valid. Multiple failures of less than 2.5 s each have an accumulative effect and will disqualify the reference eventually. This is illustrated in Figure 4. Figure 4 - Behaviour of the Dis/Requalify Timer When the incoming signal returns to normal (REF_FAIL=0), the DPLL returns to Normal mode with the output signal locked to the input signal. Each of the monitors has a build-in hysteresis to prevent flickering of the REF_FAIL status pin at the threshold boundaries. The precise frequency monitor and the timer do not affect the mode (Holdover/Normal) of the DPLL. Reference Frequency Detector Single Cycle Monitor Precise Frequency Monitor Coarse Frequency Monitor dis/requalify timer REF0 / REF1 OR OR REF_DIS= reference disrupted. This is an internal signal. Mode select state machine HOLDOVER REF_DIS REF_FAIL0 / REF_FAIL1 2.5 s 10 s current REF timer REF_FAIL SCM or CFM failure HOLDOVER |
类似零件编号 - ZL30100 |
|
类似说明 - ZL30100 |
|
|
链接网址 |
隐私政策 |
ALLDATASHEETCN.COM |
ALLDATASHEET是否为您带来帮助? [ DONATE ] |
关于 Alldatasheet | 广告服务 | 联系我们 | 隐私政策 | 链接交换 | 制造商名单 All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |