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CS2100CP-CZZ 데이터시트(PDF) 11 Page - Cirrus Logic

부품명 CS2100CP-CZZ
상세설명  Fractional-N Clock Multiplier
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제조업체  CIRRUS [Cirrus Logic]
홈페이지  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

CS2100CP-CZZ 데이터시트(HTML) 11 Page - Cirrus Logic

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CS2100-CP
DS840F1
11
4. ARCHITECTURE OVERVIEW
4.1
Delta-Sigma Fractional-N Frequency Synthesizer
The core of the CS2100 is a Delta-Sigma Fractional-N Frequency Synthesizer which has very high-resolu-
tion for Input/Output clock ratios, low phase noise, very wide range of output frequencies and the ability to
quickly tune to a new frequency. In very simplistic terms, the Fractional-N Frequency Synthesizer multiplies
the Timing Reference Clock by the value of N to generate the PLL output clock. The desired output to input
clock ratio is the value of N that is applied to the delta-sigma modulator (see Figure 7).
The analog PLL based frequency synthesizer uses a low-jitter timing reference clock as a time and phase
reference for the internal voltage controlled oscillator (VCO). The phase comparator compares the fraction-
al-N divided clock with the original timing reference and generates a control signal. The control signal is fil-
tered by the internal loop filter to generate the VCO’s control voltage which sets its output frequency. The
delta-sigma modulator modulates the loop integer divide ratio to get the desired fractional ratio between the
reference clock and the VCO output (thus the one’s density of the modulator sets the fractional value). This
allows the design to be optimized for very fast lock times for a wide range of output frequencies without the
need for external filter components. As with any Fractional-N Frequency Synthesizer the timing reference
clock should be stable and jitter-free.
Figure 7. Delta-Sigma Fractional-N Frequency Synthesizer
4.2
Hybrid Analog-Digital Phase Locked Loop
The addition of the Digital PLL and Fractional-N Logic (shown in Figure 8) to the Fractional-N Frequency
Synthesizer creates the Hybrid Analog-Digital Phase Locked Loop with many advantages over classical an-
alog PLL techniques. These advantages include the ability to operate over extremely wide frequency ranges
without the need to change external loop filter components while maintaining impressive jitter reduction per-
formance. In the Hybrid architecture, the Digital PLL calculates the ratio of the PLL output clock to the fre-
quency reference and compares that to the desired ratio. The digital logic generates a value of N which is
then applied to the Fractional-N frequency synthesizer to generate the desired PLL output frequency. Notice
that the frequency and phase of the timing reference signal do not affect the output of the PLL since the
digital control loop will correct for the PLL output. A major advantage of the Digital PLL is the ease with which
the loop filter bandwidth can be altered. The PLL bandwidth is automatically set to a wide-bandwidth mode
to quickly achieve lock and then reduced for optimal jitter rejection.
Fractional-N
Divider
Timing Reference
Clock
PLL Output
Voltage Controlled
Oscillator
Internal
Loop Filter
Phase
Comparator
N
Delta-Sigma
Modulator


유사한 부품 번호 - CS2100CP-CZZ

제조업체부품명데이터시트상세설명
logo
Cirrus Logic
CS2100-CP CIRRUS-CS2100-CP Datasheet
412Kb / 32P
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CS2100-CP-CZZ CIRRUS-CS2100-CP-CZZ Datasheet
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CS2100-CP-CZZR CIRRUS-CS2100-CP-CZZR Datasheet
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CS2100-OTP CIRRUS-CS2100-OTP Datasheet
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CS2100-OTP CIRRUS-CS2100-OTP Datasheet
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유사한 설명 - CS2100CP-CZZ

제조업체부품명데이터시트상세설명
logo
Cirrus Logic
CS2100-CP CIRRUS-CS2100-CP Datasheet
412Kb / 32P
   Fractional-N Clock Multiplier
CS2100-OTP CIRRUS-CS2100-OTP_09 Datasheet
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CS2000-OTP CIRRUS-CS2000-OTP_09 Datasheet
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CS2000-OTP CIRRUS-CS2000-OTP Datasheet
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