8 GHz fractionaL-n PLL For price, deli" />
參數(shù)資料
型號: HMC704LP4E
廠商: Hittite Microwave Corporation
文件頁數(shù): 5/44頁
文件大?。?/td> 0K
描述: IC FRACT-N PLL 16BIT 24QFN
標(biāo)準(zhǔn)包裝: 1
類型: 整數(shù) N/小數(shù) N 分頻
PLL:
輸入: CMOS
輸出: CMOS
電路數(shù): 1
比率 - 輸入:輸出: 1:1
差分 - 輸入:輸出: 是/無
頻率 - 最大: 8GHz
除法器/乘法器: 是/無
電源電壓: 3.3V,5V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 24-VQFN 裸露焊盤
供應(yīng)商設(shè)備封裝: 24-QFN 裸露焊盤(4x4)
包裝: 標(biāo)準(zhǔn)包裝
其它名稱: 1127-1066-6
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HMC704LP4E
v03.1211
8 GHz fractionaL-n PLL
For price, delivery, and to place orders: Hittite Microwave Corporation,20 Alpha Road, Chelmsford, MA 01824
Phone: 978-250-3343
Fax: 978-250-3373
Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
theory of operation
The PLL consists of the following functional blocks:
1.
Reference Path Input Buffer and ’R’ Divider
2. VCO Path Input Buffer, RF Divide-by-2 and Multi-Modulus ’N’ Divider
3. Δ
Σ Fractional Modulator
4. Phase Detector
5. Charge Pump
6. Main serial Port
7.
Lock Detect and Register Control
8. Auxiliary Output serial Port
9. Power On Reset Circuit
External Vco
The PLL charge pump can operate with the charge pump supply as high as 5.2 Volts. The charge pump output at the
varactor tuning port, normally can maintain low noise performance to within 500mV of ground or 800mV of the upper
supply voltage.
High Performance Low Spurious operation
The HMC704LP4E has been designed for the best phase noise and low spurious content possible in an integrated PLL.
spurious signals in a PLL can occur in any mode of operation and can come from a number of sources.
figure of Merit noise floor and flicker noise Models
The phase noise of an ideal phase locked oscillator is dependent upon a number of factors:
a. Frequency of the VCO, and the Phase detector
b. VCO sensitivity, kvco, VCO and Reference Oscillator phase noise profiles
c. Charge Pump current, Loop Filter and Loop Bandwidth
d. Mode of Operation: Integer, Fractional modulator style
The contributions of the PLL to the output phase noise can be characterized in terms of a Figure of Merit (FOM) for both
the PLL noise floor and the PLL flicker (1/f) noise regions, as follows:
Figure 23. Synthesizer with External VCO
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