參數(shù)資料
型號(hào)： LMX2332UTMX/NOPB
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： PLL合成/DDS/VCOs
英文描述： PLL FREQUENCY SYNTHESIZER, 1200 MHz, PDSO20
封裝： 0.173 INCH, PLASTIC, TSSOP-20
文件頁(yè)數(shù)： 26/49頁(yè)
文件大?。?/td> 4568K
代理商： LMX2332UTMX/NOPB
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(guān)PDF資料
PDF描述
LMX2332UTM/NOPB PLL FREQUENCY SYNTHESIZER, 1200 MHz, PDSO20
LMX2331UTM/NOPB PLL FREQUENCY SYNTHESIZER, 2000 MHz, PDSO20
LMX2331USLEX PLL FREQUENCY SYNTHESIZER, 2000 MHz, PQCC24
LMX2330UTMX/NOPB PLL FREQUENCY SYNTHESIZER, 2500 MHz, PDSO20
LMX2335LTMX/NOPB PLL FREQUENCY SYNTHESIZER, 1100 MHz, PDSO16
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