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| 型号： | HMC703LP4E |
| 厂商： | Hittite Microwave Corporation |
| 文件页数： | 10/58页 |
| 文件大小： | 0K |
| 描述： | IC FRACT-N PLL W/SWEEPR 24QFN |
| 标准包装： | 1 |
| 类型： | 整数 N/小数 N 分频 |
| PLL： | 是 |
| 输入： | CMOS |
| 输出： | CMOS |
| 电路数： | 1 |
| 比率 - 输入:输出： | 1:1 |
| 差分 - 输入:输出： | 是/无 |
| 频率 - 最大： | 8GHz |
| 除法器/乘法器： | 是/无 |
| 电源电压： | 3.3V，5V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-VQFN 裸露焊盘 |
| 供应商设备封装： | 24-QFN 裸露焊盘（4x4） |
| 包装： | 标准包装 |
| 其它名称： | 1127-1065-6 |
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HMC703LP4E
v02.0813
8 GHz fractional syntHesizer
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
978-250-3343 978-250-3373 fax Order On-line at www.hittite.com
Application Support: pll@hittite.com
fractional operation
Unlike an integer synthesizer, spurious signals in a fractional synthesizer can occur due to the fact that the VCO
operates at frequencies unrelated to the PD frequency. Hence intermodulation of the VCO and the PD harmonics can
cause spurious sidebands. spurious emissions are largest when the VCO operates very close to an integer multiple of
the PD. When the VCO operates exactly at a harmonic of the PD then, no in-close mixing products are present.
Interference is always present at multiples of the PD frequency, fpd, and the VCO frequency, fvco. If the fractional mode
of operation is used, the difference, Δ, between the VCO frequency and the nearest harmonic of the reference, will
create what are referred to as integer boundary spurs. Depending upon the mode of operation of the synthesizer, higher
order, lower power spurs may also occur at multiples of integer fractions (sub-harmonics) of the PD frequency. That is,
fractional VCO frequencies which are near nfpd + fpdd/m, where n, d and m are all integers and d≤m (mathematicians
refer to d/m as a rational number). We will refer to fpdd/m as an integer fraction. The denominator, m, is the order of the
spurious product. Higher values of m produce smaller amplitude spurious at offsets of mΔ and usually when m>4 spurs
are very small or unmeasurable.
The worst case, in fractional mode, is when d=1, and the VCO frequency is offset from nfpd by less than the loop
bandwidth. This is the “in-band fractional boundary” case.
Figure 29. Fractional Spurious Example
Characterization of the levels and orders of these products is not unlike a mixer spur chart. Exact levels of the products
are dependent upon isolation of the various synthesizer parts. Hittite can offer guidance about expected levels of
spurious with our PLL and VCO application boards. Regulators with high power supply rejection ratios (PsRR) are
recommended, especially in noisy applications.
When operating in fractional mode, charge pump and phase detector linearity is of paramount importance. Any non-
linearity degrades phase noise and spurious performance. Phase detector linearity degrades when the phase error is
very small and is operating back and forth between reference lead and VCO lead. To mitigate these non-linearities in
fractional mode it is critical to operate the phase detector with some finite phase offset such that either the reference or
VCO always leads. To provide a finite phase error, extra current sources can be enabled which provide a constant DC
current path to VDD (VCO leads always) or ground (reference leads always). These current sources are called charge
pump offset and they are controlled via Reg 09h. The time offset at the phase detector should be ~2.5 ns + 4 Tps, where
Tps is the RF period at the fractional prescaler input in nanoseconds (ie. after the optional fixed divide by 2). The specific
level of charge pump offset current is determined by this time offset, the comparison frequency and the charge pump
current and can be calculated from:
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相关代理商/技术参数 |
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| HMC703LP4ETR | 制造商:Hittite Microwave Corp 功能描述:IC FRACT-N PLL W/SWEEPR 24QFN 制造商:Hittite Microwave Corp 功能描述:8 GHz Fractional-N PLL with Sweeper |
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| HMC7043LP7FETR | 功能描述:IC FRACT-N PLL W/SWEEPR 48LFCSP 制造商:analog devices inc. 系列:- 包装:剪切带（CT） 零件状态:在售 类型:时钟缓冲器 PLL:是 输入:时钟 输出:CMOS，LVDS，LVPECL 电路数:1 比率 - 输入:输出:1：14 差分 - 输入:输出:是/是 频率 - 最大值:3.2GHz 分频器/倍频器:是/无 电压 - 电源:3.135 V ~ 3.465 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘，CSP 供应商器件封装:48-LFCSP（7x7） 标准包装:1 |
| HMC7044LP10BETR | 功能描述:IC JITTER ATTENUATOR 68LFCSP 制造商:analog devices inc. 系列:- 包装:剪切带（CT） 零件状态:在售 类型:漂移衰减器 PLL:是 输入:CML，CMOS，LVDS，LVPECL 输出:CML，LVDS，LVPECL 电路数:1 比率 - 输入:输出:4:14 差分 - 输入:输出:是/是 频率 - 最大值:3.2GHz 分频器/倍频器:是/无 电压 - 电源:3.135 V ~ 3.465 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:68-VFQFN 裸露焊盘，CSP 供应商器件封装:68-LFCSP-VQ（10x10） 标准包装:1 |
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