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| 型號(hào)： | MK2069-03GITR |
| 廠商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分類： | 時(shí)鐘產(chǎn)生/分配 |
| 英文描述： | 160 MHz, OTHER CLOCK GENERATOR, PDSO56 |
| 封裝： | 6.10 MM, 0.50 MM PITCH, TSSOP-56 |
| 文件頁(yè)數(shù)： | 6/20頁(yè) |
| 文件大?。?/td> | 204K |
| 代理商： | MK2069-03GITR |
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MK2069-03
VCXO-BASED CLOCK TRANSLATOR WITH HIGH MULTIPLICATION
VCXO AND SYNTHESIZER
IDT / ICS VCXO-BASED CLOCK TRANSLATOR WITH HIGH MULTIPLICATION 14
MK2069-03
REV J 030906
Circuit Troubleshooting
1) IF TCLK or VCLK does not lock to ICLK
First check VCLK to ICLK. It is best to display and trigger the
scope with RCLK, especially if a non-integer VCXO PLL
multiplication ratio is used.
If VCLK is not locked to ICLK:
1.1) Ensure the proper ICLK input is selected.
1.2) Check Divider settings.
1.3) Ensure ICLK is within lock range (within about 100 ppm
of the nominal input frequency, limited by pull range of the
external crystal). If in doubt, tweak the ICLK frequency up
and down to see if VCLK locks.
1.4) Ensure ICLK jitter is not excessive. If ICLK jitter is
excessive device may not lock. Also see item 2.1 below.
1.5) Clean the PCB. The VCXO PLL loop filter is very
sensitive to board leakage, especially when the VCXO PLL
phase detector frequency is in the low kHz. If organic solder
flux is used (most common today) scrub the PCB board with
detergent and water and then blow and bake dry. Inorganic
solder flux (Rosen core) requires solvent. See also section
3 below.
2) If There is Excessive Jitter on VCLK or TCLK
2.1) The problem may be an unstable input reference clock.
An unstable ICLK will not appear to jitter when ICLK is used
as the oscilloscope trigger source. In this condition, VCLK
and TCLK may appear to be unstable since the jitter from
ICLK (the trigger source) has been removed by the trigger
circuit of the scope.
2.2) The instability may be caused by VCXO PLL loop filter
leakage. Refer to item 1.5 above.
2.3) VCLK and TCLK jitter can also be caused by poor
power supply decoupling. Ensure a bulk decoupling
capacitor is in place.
2.4) Ensure that the VCXO PLL loop bandwidth is
sufficiently low. It should be at least 1/20th of the phase
detector frequency.
2.5) Ensure that the VCXO PLL loop damping is sufficient.
If should be at least 0.7, preferably 1.0 or higher.
2.6) Ensure that the 2nd pole in the VCXO PLL loop filter is
set sufficiently. In general, CP should be equal to CS/20. If
CP is too high, passband peaking will occur and loop
instability may occur. If CP is set too low, excessive VCXO
modulation by the charge correction pulses may occur.
3) If There is Excessive Input to Output Skew
3.1) TCLK should track VCLK. The rising edge of TCLK
should be within a few nanoseconds of VCLK.
3.2) VCLK should track RCLK. The rising edge of VCLK
should be within 5-10 nsec of RCLK (VCLK leads).
3.3) The biggest cause of input to output skew is VCXO PLL
loop filter leakage. Skew is best observed by comparing
ICLK to RCLK. When no leakage is present the rising edge
of RCLK should lag the rising edge of ICLK by about 10
μsec. Loop filter leakage can greatly increase this lag time
or cause the loop to not lock. Refer to item 1.5, above.
3.4) Another way to view the loop filter leakage is to observe
LDR pin. Use RCLK as the scope trigger. LDR will produce
a negative pulse equal in length to the charge pump pulse.
3.5) Filter leakage can also be caused by the use of
improper loop capacitors. Refer to the section titled ‘Loop
Filter Capacitor Type’ on page 9.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MK2069-04 | 制造商:ICS 制造商全稱:ICS 功能描述:VCXO-Based Universal Clock Translator |
| MK2069-04GI | 功能描述:IC VCXO CLK TRANSLATOR 56-TSSOP RoHS:否 類別:集成電路 (IC) >> 時(shí)鐘/計(jì)時(shí) - 時(shí)鐘發(fā)生器，PLL，頻率合成器 系列:- 標(biāo)準(zhǔn)包裝:39 系列:- 類型:* PLL:帶旁路 輸入:時(shí)鐘 輸出:時(shí)鐘 電路數(shù):1 比率 - 輸入:輸出:1:10 差分 - 輸入:輸出:是/是 頻率 - 最大:170MHz 除法器/乘法器:無(wú)/無(wú) 電源電壓:2.375 V ~ 3.465 V 工作溫度:0°C ~ 70°C 安裝類型:* 封裝/外殼:* 供應(yīng)商設(shè)備封裝:* 包裝:* |
| MK2069-04GILF | 功能描述:時(shí)鐘發(fā)生器及支持產(chǎn)品 VCXO-BASED UNIVERSAL CLOCK TRANSLATOR 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 |
| MK2069-04GILFTR | 功能描述:時(shí)鐘發(fā)生器及支持產(chǎn)品 VCXO-BASED UNIVERSAL CLOCK TRANSLATOR 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 |
| MK2069-04GITR | 功能描述:IC VCXO CLK TRANSLATOR 56-TSSOP RoHS:否 類別:集成電路 (IC) >> 時(shí)鐘/計(jì)時(shí) - 時(shí)鐘發(fā)生器，PLL，頻率合成器 系列:- 標(biāo)準(zhǔn)包裝:39 系列:- 類型:* PLL:帶旁路 輸入:時(shí)鐘 輸出:時(shí)鐘 電路數(shù):1 比率 - 輸入:輸出:1:10 差分 - 輸入:輸出:是/是 頻率 - 最大:170MHz 除法器/乘法器:無(wú)/無(wú) 電源電壓:2.375 V ~ 3.465 V 工作溫度:0°C ~ 70°C 安裝類型:* 封裝/外殼:* 供應(yīng)商設(shè)備封裝:* 包裝:* |
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