参数资料
型号: HMC703LP4E
厂商: Hittite Microwave Corporation
文件页数: 24/58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:
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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6 - 30
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
reference input stage
The reference buffer provides the path from an external reference source (generally crystal based) to the R divider, and
eventually to the phase detector. The buffer has two modes of operation. High Gain (recommended below 200 MHz),
and High frequency, for 200 to 350 MHz operation. The buffer is internally DC biased, with 100 internal termination.
For 50 match, an external 100 resistance to AC ground should be added, followed by an AC coupling capacitance
(impedance < 1 Ohm), then to the XREFP pin of the part.
At low frequencies, a relatively square reference is recommended to keep the input slew rate high. At higher frequencies,
a square or sinusoid can be used. The following table shows the recommended operating regions for different reference
frequencies. If operating outside these regions the part will normally still operate, but with degraded performance.
Minimum pulse width at the reference buffer input is 2.5 ns. For best spur performance when R = 1, the pulse width
should be > (2.5 ns + 8 Tps), where Tps is the period of the VCO at the prescaler input. When R > 1 minimum pulse
width is 2.5 ns.
table 7. reference sensitivity table
square Input
sinusoidal Input
Frequency
(MHz)
slew > 0.5V/ns
Recommended swing (Vpp)
Recommended Power Range (dBm)
Recommended
Min
Max
Recommended
Min
Max
< 10
YEs
0.6
2.5
x
10
YEs
0.6
2.5
x
25
YEs
0.6
2.5
ok
8
15
50
YEs
0.6
2.5
YEs
6
15
100
YEs
0.6
2.5
YEs
5
15
150
ok
0.9
2.5
YEs
4
12
200
ok
1.2
2.5
YEs
3
8
200 to 350
x
YEs1
5
10
Note: For greater than 200 MHz operation, use buffer in High Frequency Mode. Reg 08h[18] = 1
Input referred phase noise of the PLL when operating at 50 MHz is between -150 and -156 dBc/Hz at 10 kHz offset
depending upon the mode of operation. The input reference signal should be 10dB better than this floor to avoid deg-
radation of the PLL noise contribution. It should be noted that such low levels are only necessary if the PLL is the
dominant noise contributor and these levels are required for the system goals.
Figure 35. Reference Path Input Stage
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