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参数资料
| 型号： | LMX2335UTMX |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 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, PDSO16 |
| 封装： | PLASTIC, TSSOP-16 |
| 文件页数： | 28/48页 |
| 文件大小： | 3127K |
| 代理商： | LMX2335UTMX |
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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
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
pin is tied to V
.
This establishes the other input to the phase detector. Alter-
natively, this input can be tied directly to the ground plane.
With the D
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
pin, which is simply zero in this case (DC), and let F
p
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 F
r
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
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.
L
www.national.com
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相关PDF资料 |
PDF描述 |
|---|---|
| LMX2335USLBX | PLLatinum Ultra Low Power Dual Frequency Synthesizer for RF Personal Communications |
| LMX2335UTM | PLLatinum Ultra Low Power Dual Frequency Synthesizer for RF Personal Communications |
| LMX2335U | PLLatinum Ultra Low Power Dual Frequency Synthesizer for RF Personal Communications |
| LMX2336 | PLLatinum⑩ Low Power Dual Frequency Synthesizer for RF Personal Communications |
| LMX2336LSLB | PLLatinum⑩ Low Power Dual Frequency Synthesizer for RF Personal Communications |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LMX2336 | 制造商:NSC 制造商全称: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 制造商全称:National Semiconductor 功能描述:PLLatinum⑩ Low Power Dual Frequency Synthesizer for RF Personal Communications |
| LMX2336LSLB | 制造商:NSC 制造商全称:National Semiconductor 功能描述:PLLatinum⑩ Low Power Dual Frequency Synthesizer for RF Personal Communications |
| LMX2336LSLBX | 功能描述:IC PLLANTINUM SYNTHESZR LAM CSP RoHS:是 类别:集成电路 (IC) >> 时钟/计时 - 时钟发生器，PLL，频率合成器 系列:PLLatinum™ 标准包装:39 系列:- 类型:* PLL:带旁路 输入:时钟 输出:时钟 电路数:1 比率 - 输入:输出:1:10 差分 - 输入:输出:是/是 频率 - 最大:170MHz 除法器/乘法器:无/无 电源电压:2.375 V ~ 3.465 V 工作温度:0°C ~ 70°C 安装类型:* 封装/外壳:* 供应商设备封装:* 包装:* |
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