參數(shù)資料
型號(hào): LMX5080MX
廠商: NATIONAL SEMICONDUCTOR CORP
元件分類: 諧振器
英文描述: PLLatinum⑩ 2.7 GHz Low Power Dual Modulus Prescaler for RF Personal Communications
中文描述: LMX50 SERIES, PRESCALER, PDSO8
封裝: PLASTIC, SOP-8
文件頁(yè)數(shù): 4/7頁(yè)
文件大小: 99K
代理商: LMX5080MX
Functional Description
The basic phase-lock-loop (PLL) configuration using an ex-
ternal prescaler consists of a high-stability crystal reference
oscillator, a prescaler such as the National Semiconductor
LMX5080, a low frequency synthesizer, a voltage controlled
oscillator (VCO), and a loop filter. The frequency synthesizer
typically includes programmable reference [R] and feedback
[N] frequency dividers, a phase detector, as well as a charge
pump. The MC signal is fed back to the prescaler from either
Block Diagram
the low frequency synthesizer, or a controller to set the pres-
caler divide ratio to N or N+2. The prescaler output fre-
quency is established by dividing the VCO signal down via
the prescaler modulus. The RF inputs to the prescalar con-
sist of the Fin and /Fin input pins which are complementary
inputs to a differential pair amplifier. This configuration can
operate to 2 GHz with an input sensitivity of 15 dBm.
DS100940-3
www.national.com
4
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