參數(shù)資料
型號(hào)： LMX2485SQX
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類(lèi)： XO, clock
英文描述： 50 MHz - 3.0 GHz High Performance Delta-Sigma Low Power Dual PLLatinum⑩ Frequency Synthesizers with 800 MHz Integer PLL
中文描述： PLL FREQUENCY SYNTHESIZER, 3000 MHz, PQCC24
封裝： 4 X 4 MM, 0.8 MM, PLASTIC, LLP-24
文件頁(yè)數(shù)： 16/37頁(yè)
文件大?。?/td> 861K
代理商： LMX2485SQX
Bench Test Setups
20087769
Charge Pump Current Measurement Procedure
The above block diagram shows the test procedure for testing the RF and IF charge pumps. These tests include absolute current
level, mismatch, and leakage measurement. In order to measure the charge pump currents, a signal is applied to the high
frequency input pins. The reason for this is to guarantee that the phase detector gets enough transitions in order to be able to
change states. If no signal is applied, it is possible that the charge pump current reading will be low due to the fact that the duty
cycle is not 100%. The OSCin Pin is tied to the supply. The charge pump currents can be measured by simply programming the
phase detector to the necessary polarity. For instance, in order to measure the RF charge pump, a 10 MHz signal is applied to
the FinRF pin. The source current can be measured by setting the RF PLL phase detector to a positive polarity, and the sink
current can be measured by setting the phase detector to a negative polarity. The IF PLL currents can be measured in a similar
way. Note that the magnitude of the RF PLL charge pump current is controlled by the RF_CPG bit. Once the charge pump
currents are known, the mismatch can be calculated as well. In order to measure leakage, the charge pump is set to a TRI-STATE
mode by enabling the RF_CPT and IF_CPT bits. The table below shows a summary of the various charge pump tests.
Current Test
RF Source
RF Sink
RF TRI-STATE
IF Source
IF Sink
IF TRI-STATE
RF_CPG
0 to 15
0 to 15
X
X
X
X
RF_CPP
0
1
X
X
X
X
RF_CPT
0
0
1
X
X
X
IF_CPP
X
X
X
0
1
X
IF_CPT
X
X
X
0
0
1
L
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參數(shù)描述
LMX2485SQX/NOPB 功能描述:鎖相環(huán) - PLL RoHS:否 制造商:Silicon Labs 類(lèi)型:PLL Clock Multiplier 電路數(shù)量:1 最大輸入頻率:710 MHz 最小輸入頻率:0.002 MHz 輸出頻率范圍:0.002 MHz to 808 MHz 電源電壓-最大:3.63 V 電源電壓-最小:1.71 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:QFN-36 封裝:Tray
LMX2486 制造商:NSC 制造商全稱(chēng):National Semiconductor 功能描述:1.0 GHz - 4.5 GHz High Performance Delta-Sigma Low Power Dual PLLatinum TM Frequency Synthesizers with 3.0 GHz Integer PLL
LMX2486EVAL 功能描述:時(shí)鐘和定時(shí)器開(kāi)發(fā)工具 LMX2486 EVAL BOARD RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Modules 類(lèi)型:Clock Conditioners 工具用于評(píng)估:LMK04100B 頻率:122.8 MHz 工作電源電壓:3.3 V
LMX2486SQ 制造商:Texas Instruments 功能描述:PLL Frequency Synthesizer Dual 5MHz to 4500MHz 24-Pin LLP EP T/R
LMX2486SQ/NOPB 功能描述:鎖相環(huán) - PLL RoHS:否 制造商:Silicon Labs 類(lèi)型:PLL Clock Multiplier 電路數(shù)量:1 最大輸入頻率:710 MHz 最小輸入頻率:0.002 MHz 輸出頻率范圍:0.002 MHz to 808 MHz 電源電壓-最大:3.63 V 電源電壓-最小:1.71 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:QFN-36 封裝:Tray
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