參數(shù)資料
型號(hào)： LMX2487ESQ
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： XO, clock
英文描述： 7.5 GHz High Performance Delta-Sigma Low Power Dual PLLatinum⑩ Frequency Synthesizers with 3.0 GHz Integer PLL
中文描述： PLL FREQUENCY SYNTHESIZER, 7500 MHz, PQCC24
封裝： 4 X 4 MM, 0.80 MM HEIGHT, LLP-24
文件頁(yè)數(shù)： 16/38頁(yè)
文件大小： 419K
代理商： LMX2487ESQ
Bench Test Setups
30013969
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
www.national.com
16
L
相關(guān)PDF資料
PDF描述
LMX2487ESQX 7.5 GHz High Performance Delta-Sigma Low Power Dual PLLatinum⑩ Frequency Synthesizers with 3.0 GHz Integer PLL
LMX2515 PLLatinum⑩ Frequency Synthesizer System with Integrated VCO
LMX2515LQ0701 PLLatinum⑩ Frequency Synthesizer System with Integrated VCO
LMX2515LQ1321 PLLatinum⑩ Frequency Synthesizer System with Integrated VCO
LMX2515LQX0701 PLLatinum⑩ Frequency Synthesizer System with Integrated VCO
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LMX2487ESQ/NOPB 功能描述:鎖相環(huán) - PLL RoHS:否 制造商:Silicon Labs 類型: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
LMX2487ESQE 制造商:Texas Instruments 功能描述:PLL, 7.5GHZ, DUAL, DELTA SIGMA, SMD 制造商:Texas Instruments 功能描述:Delta-Sigma LPower Dual PLL,LMX2487ESQE
LMX2487ESQE/NOPB 功能描述:鎖相環(huán) - PLL RoHS:否 制造商:Silicon Labs 類型: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
LMX2487ESQNOPB 制造商:National Semiconductor 功能描述:PLL Frequency Synthesizer Dual 5MHz to 7500MHz 24-Pin LLP EP T/R
LMX2487ESQX 制造商:NSC 制造商全稱:National Semiconductor 功能描述:7.5 GHz High Performance Delta-Sigma Low Power Dual PLLatinum⑩ Frequency Synthesizers with 3.0 GHz Integer PLL
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*