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參數(shù)資料
| 型號： | LMX2332UTMX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | XO, clock |
| 英文描述： | PLLatinum Ultra Low Power Dual Frequency Synthesizer for RF Personal Communications |
| 中文描述： | PLL FREQUENCY SYNTHESIZER, 1200 MHz, PDSO20 |
| 封裝： | 0.173 INCH, PLASTIC, TSSOP-20 |
| 文件頁數(shù)： | 25/42頁 |
| 文件大小： | 3318K |
| 代理商： | LMX2332UTMX |
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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 a LMX2330TMEB Evalua-
tion Board. The IF charge pump measurement setup is
similar to the RF charge pump measurement 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
and swept from 2.7V to 5.5V. By means
of a signal generator, a 10 MHz signal is typically applied to
the f
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 V
cc
.
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
pin, which is simply zero in this case (DC), and let F
p
represent the frequency of the signal applied to the f
RF
pin. The phase detector is sensitive to the rising edges of F
r
and F
. Assuming positive VCO characteristics; the charge
pump turns ON and sinks current when the first rising edge
of F
is detected. Since F
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.
L
www.national.com
25
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相關(guān)代理商/技術(shù)參數(shù) |
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| LMX2334ATMX | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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| LMX2335 WAF | 制造商:Texas Instruments 功能描述: |
| LMX2335L | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:無線通訊 |
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