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參數(shù)資料
| 型號： | LMX2486 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | 1.0 GHz - 4.5 GHz High Performance Delta-Sigma Low Power Dual PLLatinum TM Frequency Synthesizers with 3.0 GHz Integer PLL |
| 中文描述： | 1.0千兆赫- 4.5吉赫高性能Δ-Σ低功耗雙PLLatinum商標(biāo)頻率合成器與整數(shù)的3.0 GHz鎖相環(huán) |
| 文件頁數(shù)： | 18/37頁 |
| 文件大?。?/td> | 870K |
| 代理商： | LMX2486 |
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Bench Test Setups
(Continued)
20156970
Frequency Input Pin
OSCin
FinRF
DC Blocking Capacitor
1000 pF
47 pF || 1000 pF
Corresponding Counter
RF_R / 2
RF_N / 2
Default Counter Value
50
RF_P = 16/17/20/21
1023 + 2097150 / 4194301
RF_P = 32/33/36/37
2039 + 2097150/4194301
1533
50
MUX Value
14
15
FinIF
OSCin
47 pF || 1000 pF
1000 pF
IF_N / 2
IF_R / 2
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 LMX2486 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
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相關(guān)PDF資料 |
PDF描述 |
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| LMX2487E | 7.5 GHz High Performance Delta-Sigma Low Power Dual PLLatinum⑩ Frequency Synthesizers with 3.0 GHz Integer PLL |
| LMX2487ESQ | 7.5 GHz High Performance Delta-Sigma Low Power Dual PLLatinum⑩ Frequency Synthesizers with 3.0 GHz Integer PLL |
| 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 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LMX2486EVAL | 功能描述:時(shí)鐘和定時(shí)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 |
| LMX2486SQX | 制造商:Texas Instruments 功能描述:PLL Frequency Synthesizer Dual 5MHz to 4500MHz 24-Pin LLP EP T/R |
| LMX2486SQX/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 |
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