- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄384604 > LMX2485SQX (NATIONAL SEMICONDUCTOR CORP) 50 MHz - 3.0 GHz High Performance Delta-Sigma Low Power Dual PLLatinum⑩ Frequency Synthesizers with 800 MHz Integer PLL PDF資料下載
參數(shù)資料
| 型號： | LMX2485SQX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 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 |
| 文件頁數(shù)： | 18/37頁 |
| 文件大?。?/td> | 861K |
| 代理商： | LMX2485SQX |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁當前第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁
Bench Test Setups
(Continued)
20087770
Frequency Input Pin
OSCin
FinRF
FinIF
OSCin
DC Blocking Capacitor
1000 pF
100 pF// 1000 pF
100 pF
1000 pF
Corresponding Counter
RF_R / 2
RF_N / 2
IF_N / 2
IF_R / 2
Default Counter Value
50
502 + 2097150 / 4194301
534
50
MUX Value
14
15
13
12
Sensitivity Measurement Procedure
Sensitivity is defined as the power level limits beyond which the output of the counter being tested is off by 1 Hz or more of its
expected value. It is typically measured over frequency, voltage, and temperature. In order to test sensitivity, the MUX[3:0] word
is programmed to the appropriate value. The counter value is then programmed to a fixed value and a frequency counter is set
to monitor the frequency of this pin. The expected frequency at the Ftest/LD pin should be the signal generator frequency divided
by twice the corresponding counter value. The factor of two comes in because the LMX2485 has a flip-flop which divides this
frequency by two to make the duty cycle 50% in order to make it easier to read with the frequency counter. The frequency counter
input impedance should be set to high impedance. In order to perform the measurement, the temperature, frequency, and voltage
is set to a fixed value and the power level of the signal is varied. Note that the power level at the part is assumed to be 4 dB less
than the signal generator power level. This accounts for 1 dB for cable losses and 3 dB for the pad. The power level range where
the frequency is correct at the Ftest/LD pin to within 1 Hz accuracy is recorded for the sensitivity limits. The temperature,
frequency, and voltage can be varied in order to produce a family of sensitivity curves. Since this is an open-loop test, the charge
pump is set to TRI-STATE and the unused side of the PLL (RF or IF) is powered down when not being tested. For this part, there
are actually four frequency input pins, although there is only one frequency test pin (Ftest/LD). The conditions specific to each pin
are shown in above table.
Note that for the RF N counter, a fourth order fractional modulator is used in 22-bit mode with a fraction of 2097150 / 4194301
is used. The reason for this long fraction is to test the RF N counter and supporting fractional circuitry as completely as possible.
L
www.national.com
18
相關PDF資料 |
PDF描述 |
|---|---|
| LMX2487 | 3.0 GHz - 6.0 GHz High Performance Delta-Sigma Low Power Dual PLLatinum⑩ Frequency Synthesizers with 3.0 GHz Integer PLL |
| LMX2487SQ | 3.0 GHz - 6.0 GHz High Performance Delta-Sigma Low Power Dual PLLatinum⑩ Frequency Synthesizers with 3.0 GHz Integer PLL |
| LMX2487SQX | 3.0 GHz - 6.0 GHz High Performance Delta-Sigma Low Power Dual PLLatinum⑩ Frequency Synthesizers with 3.0 GHz Integer PLL |
| LMX3161 | Single Chip Radio Transceiver(單芯片無線電收發(fā)器) |
| LMX3161VBH | Single Chip Radio Transceiver |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LMX2485SQX/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 |
| LMX2486 | 制造商:NSC 制造商全稱: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:時鐘和定時器開發(fā)工具 LMX2486 EVAL BOARD RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Modules 類型:Clock Conditioners 工具用于評估: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 |
發(fā)布緊急采購，3分鐘左右您將得到回復。