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參數(shù)資料
| 型號： | LMX2335UTM/NOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | PLL合成/DDS/VCOs |
| 英文描述： | PLL FREQUENCY SYNTHESIZER, 1200 MHz, PDSO16 |
| 封裝： | PLASTIC, TSSOP-16 |
| 文件頁數(shù)： | 21/48頁 |
| 文件大?。?/td> | 3127K |
| 代理商： | LMX2335UTM/NOPB |
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Test Setups
LMX2335U and LMX2336U Charge Pump Test Setup
10136750
The block diagram above illustrates the setup required to
measure the LMX2336U device’s RF1 charge pump sink
current. The same setup is used for the LMX2336TMEB/
LMX2336SLEEB Evaluation Boards. The RF2 charge pump
measurement setup is similar to the RF1 charge pump mea-
surement setup. The purpose of this test is to assess the
functionality of the RF1 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 RF1 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 RF1 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 RF1
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 RF1
charge pump source current. Likewise, selecting TRI-STATE
(TRI-STATE ID
o RF1 Bit = 1) for Charge Pump State in
Code Loader facilitates the measurement of the TRI-STATE
current.
The measurements are repeated at different temperatures,
namely T
A = -40C, +25C, and +85C.
The LMX2335U charge pump test setup is very much similar
to the above test setup.
LMX2335U/LMX2336U
www.national.com
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LMX2335UTMX | 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 |
| LMX2336 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:PLLatinum⑩ Dual Frequency Synthesizer for RF Personal Communications |
| LMX2336 WAF | 制造商:Texas Instruments 功能描述: |
| LMX2336L | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:PLLatinum⑩ Low Power Dual Frequency Synthesizer for RF Personal Communications |
| LMX2336LSLB | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:PLLatinum⑩ Low Power Dual Frequency Synthesizer for RF Personal Communications |
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