參數(shù)資料
型號(hào)： PS2500AIT
廠商： Electronic Theatre Controls, Inc.
元件分類(lèi)： XO, clock
英文描述： Low-Power Direct Digital Modulation Frequency Synthesizer
中文描述： 低功耗直接數(shù)字調(diào)制頻率合成器
文件頁(yè)數(shù)： 4/28頁(yè)
文件大?。?/td> 184K
代理商： PS2500AIT
PS2500 2.2 GHz Fractional-N Frequency Synthesizer
- 4 -
Philsar Semiconductor Inc.
146 Colonnade Road S.
Nepean, Ontario, Canada
K2E 7Y1
Tel: 613-274-0922
Fax: 613-274-0915
www.philsar.com
PMP-001-DS2 V1.2
Main and Auxiliary Fractional Units
The PS2500 provides fractionality through the use of main and auxiliary
Σ
modulators. The output from
the main and auxiliary modulators are combined with the main and auxiliary divider ratios through their
respective Fractional Units.
VCO Prescalers
The VCO prescalers provide low-noise signal conditioning of the VCO signals. They are used to translate
from an off-chip single-ended or differential signal to an on-chip differential ECL/CML signal. The
PS2500 has independent main and auxiliary VCO prescalers.
Main and Auxiliary VCO Dividers
The PS2500 provides programmable dividers that control the ECL/CML prescalers and supply the required
signals to the charge pump phase detectors. Programmable divide ratios ranging from 38 to 537 are
possible in fractional-N mode and from 32 to 543 in integer-N mode.
Reference Frequency Oscillator
The PS2500 has a self-contained low-noise crystal oscillator. This crystal oscillator is followed by the
clock generation circuitry that generates the required clock for the programmable reference frequency
dividers.
Reference Frequency Dividers
The crystal oscillator signal can be divided by a ratio of 1 to 32 to create the reference frequencies for the
phase detectors. The PS2500 has both a Main and an Auxiliary frequency synthesizer and provides
independently configurable dividers of the crystal oscillator frequency for both the main and auxiliary
phase detectors. The divide ratios can be programmed through the Reference Frequency Dividers Register.
Note:
The divided crystal oscillator frequencies (which are the internal reference frequencies) F
ref_main
and F
ref_aux
are referred to as the reference frequencies throughout this document.
Phase Detectors and Charge Pumps
The PS2500 uses a separate charge pump phase detector (patent pending), for each synthesizer which
provides a programmable gain, Kd, from 20 to 160
μ
A/radian in steps of approximately 5
μ
A/radian. Phase
detector gains are programmable through the control register.
Frequency Steering
When programmed for Power Steering
TM
(patent pending), the PS2500 has a frequency power steering
circuit, which assists the loop filter to steer the VCO, through the
LD/PS
pin. In this configuration, the
LD/PS
pin can provide for more rapid acquisition (approximately five times faster than conventional
phase/frequency detectors).
When programmed for lock detection, internal frequency steering is implemented and provides frequency
acquisition times comparable to conventional phase/frequency detector.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PS2500AIT-ES2/2 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:Low-Power Direct Digital Modulation Frequency Synthesizer
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