- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄44574 > LMX2331UTM/NOPB (NATIONAL SEMICONDUCTOR CORP) PLL FREQUENCY SYNTHESIZER, 2000 MHz, PDSO20 PDF資料下載
參數(shù)資料
| 型號： | LMX2331UTM/NOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | PLL合成/DDS/VCOs |
| 英文描述： | PLL FREQUENCY SYNTHESIZER, 2000 MHz, PDSO20 |
| 封裝： | 0.173 INCH, PLASTIC, TSSOP-20 |
| 文件頁數(shù)： | 26/49頁 |
| 文件大?。?/td> | 4568K |
| 代理商： | LMX2331UTM/NOPB |
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頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁當前第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頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁
Test Setups
LMX233xU Charge Pump Test Setup
10136650
The block diagram above illustrates the setup required to
measure the LMX233xU device’s RF charge pump sink cur-
rent. The same setup is used for the LMX2330TMEB/
LMX2330SLEEB Evaluation Boards. The IF charge pump
measurement setup is similar to the RF charge pump mea-
surement setup. The purpose of this test is to assess the
functionality of the RF charge pump.
This setup uses an open loop configuration. A power supply
is connected to V
cc and swept from 2.7V to 5.5V. By means
of a signal generator, a 10 MHz signal is typically applied to
the f
IN RF pin. The signal is one of two inputs to the phase
detector. The 3 dB pad provides a 50
match between the
PLL and the signal generator. The OSC
in pin is tied to Vcc.
This establishes the other input to the phase detector. Alter-
natively, this input can be tied directly to the ground plane.
With the D
o RF pin connected to a Semiconductor Param-
eter Analyzer in this way, the sink, source, and TRI-STATE
currents can be measured by simply toggling the Phase
Detector Polarity and Charge Pump State states in Code
Loader. Similarly, the LOW and HIGH currents can be mea-
sured by switching the Charge Pump Gain’s state between
1X and 4X in Code Loader.
Let F
r represent the frequency of the signal applied to the
OSC
in pin, which is simply zero in this case (DC), and let Fp
represent the frequency of the signal applied to the f
IN RF
pin. The phase detector is sensitive to the rising edges of F
r
and F
p. Assuming positive VCO characteristics; the charge
pump turns ON and sinks current when the first rising edge
of F
p is detected. Since Fr has no rising edge, the charge
pump continues to sink current indefinitely.
Toggling the Phase Detector Polarity state to negative
VCO characteristics allows the measurement of the RF
charge pump source current. Likewise, selecting TRI-STATE
(TRI-STATE ID
o RF Bit = 1) for Charge Pump State in Code
Loader facilitates the measurement of the TRI-STATE cur-
rent.
The measurements are repeated at different temperatures,
namely T
A = -40C, +25C, and +85C.
LMX2330U/LMX2331U/LMX2332U
www.national.com
32
相關PDF資料 |
PDF描述 |
|---|---|
| LMX2331USLEX | PLL FREQUENCY SYNTHESIZER, 2000 MHz, PQCC24 |
| LMX2330UTMX/NOPB | PLL FREQUENCY SYNTHESIZER, 2500 MHz, PDSO20 |
| LMX2335LTMX/NOPB | PLL FREQUENCY SYNTHESIZER, 1100 MHz, PDSO16 |
| LMX2335LMX | PLL FREQUENCY SYNTHESIZER, 1100 MHz, PDSO16 |
| LMX2335LTM/NOPB | PLL FREQUENCY SYNTHESIZER, 1100 MHz, PDSO16 |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LMX2331UTMX | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:PLLatinum Ultra Low Power Dual Frequency Synthesizer for RF Personal Communications |
| LMX2332 WAF | 制造商:Texas Instruments 功能描述: |
| LMX2332A | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:PLLatinum⑩ Dual Frequency Synthesizer for RF Personal Communications |
| LMX2332ATM | 制造商:Rochester Electronics LLC 功能描述: 制造商:Texas Instruments 功能描述: |
| LMX2332ATMX | 功能描述:IC FREQ SYNTH DUAL 20-TSSOP RoHS:否 類別:集成電路 (IC) >> 時鐘/計時 - 時鐘發(fā)生器，PLL，頻率合成器 系列:PLLatinum™ 標準包裝:39 系列:- 類型:* PLL:帶旁路 輸入:時鐘 輸出:時鐘 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/無 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:* 供應商設備封裝:* 包裝:* |
發(fā)布緊急采購，3分鐘左右您將得到回復。