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參數(shù)資料
| 型號： | SI5315B-C-GM |
| 廠商： | Silicon Laboratories Inc |
| 文件頁數(shù)： | 22/54頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC CLOCK MULT 8KHZ-125MHZ 36QFN |
| 應(yīng)用說明： | SI5315/17 Crystal Selection AppNote |
| 標(biāo)準(zhǔn)包裝： | 490 |
| 系列： | DSPLL® |
| 類型： | 時鐘/頻率倍增器，抖動衰減器，多路復(fù)用器 |
| PLL： | 無 |
| 主要目的： | 以太網(wǎng)，SONET/SDH/PDH，電信 |
| 輸入： | CML，CMOS，LVDS，LVPECL |
| 輸出： | CML，CMOS，LVDS，LVPECL |
| 電路數(shù)： | 1 |
| 比率 - 輸入:輸出： | 2:2 |
| 差分 - 輸入:輸出： | 是/是 |
| 頻率 - 最大： | 125MHz |
| 電源電壓： | 1.71 V ~ 3.63 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 36-VFQFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 36-QFN（6x6） |
| 包裝： | 托盤 |
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Si5315
Rev. 1.0
29
5.2. PLL Self-Calibration
An internal self-calibration (ICAL) is performed before operation to optimize loop parameters and jitter
performance. While the self-calibration is being performed, the DSPLL is being internally controlled by the self-
calibration state machine. The LOL alarm will be active during ICAL. The self-calibration time tLOCKHW is given in
Any of the following events will trigger a self-calibration:
Power-on-reset (POR)
Release of the external reset pin RST (transition of RST from 0 to 1)
Change in FRQSEL, FRQTBL, BWSEL, or XTAL/CLOCK pins
Internal DSPLL registers out-of-range, indicating the need to relock the DSPLL
In any of the above cases, an internal self-calibration will be initiated if a valid input clock exists (no input alarm)
and is selected as the active clock at that time. The external crystal or reference clock must also be present for the
self-calibration to begin. If valid clocks are not present, the self-calibration state machine will wait until they appear,
at which time the calibration will start. An output clock will be active while waiting for a valid input clock. The output
clock frequency is based on the VCO range determine by FRQSEL and FRQTBL settings. This output clock will
vary by ±20%. If no output clock is desired prior to an ICAL, then the SFOUT pins should be kept at LM for
1.2 seconds until the output clock is stable.
After a successful self-calibration has been performed with a valid input clock, no subsequent self calibrations are
performed unless one of the above conditions are met. If the input clock is lost following self-calibration, the device
enters holdover mode. When the input clock returns, the device relocks to the input clock without performing a self-
calibration.
5.2.1. Input Clock Stability during Internal Self-Calibration
An exit from reset must occur when the selected CKINn clock is stable in frequency with a frequency value that is
within the device operating range. The other CKINs must also either be stable in frequency or squelched during a
reset.
5.2.2. Self-Calibration caused by Changes in Input Frequency
If the selected CKINn varies by 500 ppm or more in frequency since the last calibration, the device may initiate a
self-calibration.
5.2.3. Device Reset
Upon powerup, the device internally executes a power-on-reset (POR) which resets the internal device logic. The
pin RST can also be used to initiate a reset. The device stays in this state until a valid CKINn is present, when it
then performs a PLL Self-Calibration (See 5.2. "PLL Self-Calibration”).
5.2.4. Recommended Reset Guidelines
Follow the recommended RESET guidelines in Table 10 when reset should be applied to a device.
Table 10. Si5315 Pins and Reset
Pin #
Si5315 Pin Name
Must Reset after Changing
2FRQTBL
Yes
11
XTAL/CLOCK
Yes
22
BWSEL0
Yes
23
BWSEL1
Yes
24
FRQSEL0
Yes
25
FRQSEL1
Yes
26
FRQSEL2
Yes
27
FRQSEL3
Yes
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SI5315B-C-GMR | 功能描述:時鐘發(fā)生器及支持產(chǎn)品 Pin-Ctrl SyncE Clk Xplier/Jitt Attn 2/2 RoHS:否 制造商:Silicon Labs 類型:Clock Generators 最大輸入頻率:14.318 MHz 最大輸出頻率:166 MHz 輸出端數(shù)量:16 占空比 - 最大:55 % 工作電源電壓:3.3 V 工作電源電流:1 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-56 |
| SI5315-C | 制造商:AUK 制造商全稱:AUK corp 功能描述:IRED |
| SI5315-C(B) | 制造商:AUK 制造商全稱:AUK corp 功能描述:IRED |
| SI5315-C_1 | 制造商:AUK 制造商全稱:AUK corp 功能描述:IRED |
| SI5315-CB | 制造商:AUK 制造商全稱:AUK corp 功能描述:IRED |
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