參數(shù)資料
型號(hào)： HMC700LP4E
廠商： Hittite Microwave Corporation
文件頁(yè)數(shù)： 23/26頁(yè)
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： 是
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(wú)
頻率 - 最大： 8GHz
除法器/乘法器： 是/無(wú)
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(pán)
供應(yīng)商設(shè)備封裝： 24-QFN 裸露焊盤(pán)（4x4）
包裝： 標(biāo)準(zhǔn)包裝
其它名稱： 1127-1064-6
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
978-250-3343 tel 978-250-3373 fax Order On-line at www.hittite.com
Application Support: apps@hittite.com
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HMC700LP4 / 700LP4E
v11.0411
8 GHz 16-Bit Fractional-N PLL
Theory of Operation
the HMc700LP4(E) is targeted for ultra low phase noise applications. the synthesizer has been designed with very
low noise reference path, phase detector and charge pump.
External VCO
the HMc700LP4(E) is targeted for ultra low phase noise applications with an external Vco. the synthesizer charge
pump can operate with the charge pump supply as high as 5.5 Volts. the charge pump output at the varactor tuning
port, normally can maintain low noise performance to within 500mV of either ground or the upper supply voltage (see
example (figure 3)
Figure 7. HMC700LP4(E) Synthesizer with External VCO
High Performance Low Spurious Operation
the HMc700LP4(E) has been designed for the best phase noise possible in an integrated synthesizer. Spurious
signals in a synthesizer can occur in any mode of operation and can come from a number of sources. in general
spurious can be the result of interference that gets through the loop filter and modulates the input tuning port of the
Vco directly. it can also result from interference that modulates the Vco indirectly through power supplies, ground,
or output ports, or bypasses the loop filter due to poor isolation of the filter. it can also simply add to the output of the
synthesizer.
interference is always present at multiples of the PFD frequency, and the input reference frequency. Depending upon
the mode of operation of the synthesizer spurious may also occur at integer sub-multiples of the reference frequency.
if the fractional mode of operation is used the difference between the Vco frequency and the nearest harmonic of the
reference, will also create what are referred to as integer boundary spurs.
the synthesizer necessarily contains digital circuitry to control the prescaler. the circuitry mostly operates at the PFD
frequency. there is more circuitry active in fractional mode, hence more full switching cMoS is used and the potential
for interference is greater.
the HMc700LP4(E) has been designed and tested for low spurious performance in either integer or fractional mode
of operation. reference spurious levels are typically below -100 dBc, and in-band fractional boundary spurious are
typically below integrated phase noise, frequency planning can improve spurious performance in many cases.
reference spurious levels of below -100 dBc require superb board isolation of power supplies, isolation of the Vco from
the digital switching of the synthesizer, isolation of the Vco load from the synthesizer and isolation of the crystal from
the Vco. typical board layout, evaluation boards and application information are available for low spurious operation.
operation with lower levels of isolation in the application circuit board from those recommended by Hittite may result in
higher spurious levels.
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參數(shù)描述
HMC700LP4ETR 制造商:Hittite Microwave Corp 功能描述:IC FRACT-N PLL 16BIT 24QFN 制造商:Hittite Microwave Corp 功能描述:HMC700 Series 8 GHz 16-Bit Prescaler Fractional-N PLL - 4x4 mm QFN-24
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