- 您现在的位置：买卖IC网 > PDF目录1996 > HMC704LP4E (Hittite Microwave Corporation)IC FRACT-N PLL 16BIT 24QFN PDF资料下载
参数资料
| 型号： | HMC704LP4E |
| 厂商： | Hittite Microwave Corporation |
| 文件页数： | 9/44页 |
| 文件大小： | 0K |
| 描述： | IC FRACT-N PLL 16BIT 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： | 1127-1066-6 |
第1页第2页第3页第4页第5页第6页第7页第8页当前第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页
P
LL
s
-
s
M
T
5 - 17
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
nfpd
(n+1)fpd
Integer
Boundary
fVCO
Δ
Integer
Boundary
n = integer
d = 0
m = 1 = 1st order
Δ < Loop Bandwidth
1st Order Integer Boundary spur
(n+1)fpd
fVCO
Δ
Integer
Boundary
n = integer
d = 1
m = 2 = 2nd order
Δ < Loop Bandwidth
2nd Order spur
2Δ
Integer
Boundary
Figure 26. Fractional Spurious Example
(n+1/2)fpd
nfpd
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 PLL 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 ~2.5ns + 4Tps, where
Tps is the RF period at the fractional prescaler input in nanoseconds (ie. after the optional fixed divide by 2). The spe-
cific 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:
Operation with charge pump offset influences the required configuration of the Lock Detect function. Refer to the de-
scription of “PD Window Based Lock Detect” later in this document. Note that this calculation can be performed for the
center frequency of the VCO, and does not need refinement for small differences (<25%) in center frequencies.
Another factor in the spectral performance in Fractional Mode is the choice of the Delta-sigma Modulator mode. Mode
A can offer better in-band spectral performance (inside the loop bandwidth) while Mode B offers better out of band per-
formance. see “Reg 06h”[3:2] for DsM mode selection. Finally, all fractional PLLs create fractional spurs at some level.
Hittite offers the lowest level fractional spurious in the industry in an integrated solution.
(
)
(
)
9
Required CP Offset ( A) = 2.5 10
4
(sec)
(
)
(
)
PS
comparison
CP
T
F
Hz
I
A
×
+
×
(EQ 4)
相关PDF资料 |
PDF描述 |
|---|---|
| HMC830LP6GE | IC FRACT-N PLL W/VCO 40QFN |
| HMP8117CNZ | IC VIDEO DECODER NTSC/PAL 80PQFP |
| HMP8156ACNZ | IC VIDEO ENCODER NTSC/PAL 64MQFP |
| HSP45102SC-40Z | IC OSC NCO 40MHZ 28-SOIC |
| HSP45106JC-33Z | IC OSC NCO 33MHZ 84-PLCC |
相关代理商/技术参数 |
参数描述 |
|---|---|
| HMC704LP4ETR | 制造商:Hittite Microwave Corp 功能描述:IC FRACT-N PLL 16BIT 24QFN |
| HMC705LP4 | 制造商:HITTITE 制造商全称:Hittite Microwave Corporation 功能描述:6.5 GHz PROGRAMMABLE DIVIDER (N = 1 - 17) |
| HMC705LP4E | 制造商:Hittite Microwave Corp 功能描述:IC DIVIDER HBT PROGR 24-QFN |
| HMC705LP4ETR | 功能描述:IC DIVIDER HBT PROGR 24QFN 制造商:analog devices inc. 系列:- 包装:剪切带（CT） 零件状态:在售 功能:分频器 频率:100MHz ~ 6.5GHz RF 类型:- 辅助属性:- 封装/外壳:24-VFQFN 裸露焊盘 供应商器件封装:24-QFN（4x4） 标准包装:1 |
| hmc706lc3c | 制造商:Hittite Microwave Corp 功能描述:IC CONV NRZ-RZ 13GBPS 16SMD |
发布紧急采购，3分钟左右您将得到回复。