8 GHz fractional syntHesizer For price" />
參數(shù)資料
型號: HMC703LP4E
廠商: Hittite Microwave Corporation
文件頁數(shù): 17/58頁
文件大小: 0K
描述: IC FRACT-N PLL W/SWEEPR 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: 1127-1065-6
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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
Then, for each frequency of interest, fVCO:
4
Calculate the approximate value of N that is required: N = fVCO/fPD = NINT + Nfrac
5.
Program NINT into integer register Reg 03h
Note: There is no need to re-program NINT if it has not changed from the previous set-point.
6.
Program the fractional register, Reg 04h = Ceiling(Nfrac*224)
where the ceiling function means “round up to the nearest integer.”
Example: To configure HMC703LP4E for exact frequency mode with channel spacing of 50 kHz, VCO frequency =
2000.200 MHz and fPD =61.44 MHz:
1.
fgcd(61.44 MHz, 50 kHz) = 10 kHz (as above)
2.
Calculate Nchannels=fPD / fgcd = 6144. Program into Reg 0Dh (6144 dec = 1800 hex)
3.
set the modulator mode to Exact Frequency (sD_MODE in Reg 06h[7:5] = 2)
4.
Calculate N = 2000.2 MHz / 61.44 MHz = 32.55533854 = 32 + 0.55533854
5.
Program integer divisor NINT (Reg 03h) = 32d = 20h
6.
Program fractional divisor Reg 04h= CEILING(0.55533854 x 224) = 9,317,035 = 8E2AABh
In the above example, without exact frequency mode, there would have been a -1.2 Hz error due to quantization.
fM Mode
The HMC703LP4E PM mode supports simple FsK modulation via a level sensitive trigger. FM mode can be used for
simple communications links, with data rate limitations set by the loop filter bandwidth.
The HMC703LP4E is configured to operate in FM mode by writing Reg 06h[7:5] = 3.
The FM mode allows the user to toggle between two frequencies F0 = N1*fPD and F1 = N2*fPD based on the level of
the TRIG.
The following procedure is recommended to configure HMC703LP4E to FM mode:
1.
Lock in fractional mode (Reg 06h[7:5]= 0) to F0 = fPD x (Reg 03h.Reg 04h).
2.
Program (Reg 0Ch.Reg 0Dh) for F1.
3.
Change mode to FM (Reg 06h[7:5] = 3).
4.
select the trigger source Reg 06h[9] = 1, TRIG (pin-6), or Reg 06h[9] = 0 - trigger from sPI bit Reg 0Eh[0]
5.
switch between F0 and F1 on a trigger state 0/1 = F0/F1.
It is possible to change the next frequency state between trigger events, without affecting the output - ie. write the F0
value while on F1, or F1 while on F0 .
PM Mode
The HMC703LP4E PM mode supports simple bi-phase modulation via a level sensitive trigger. PM mode also supports
programmable phase steps via an edge sensitive trigger. PM modes can be used for simple communications links,
with data rate limitations set by the loop filter bandwidth.
The HMC703LP4E is configured to operate in all PM mode by writing Reg 06h[7:5] = 4. In general the modulation
phase step, Δq, in either PM mode is given by
24
x 360
(deg)
2
=
where x = Reg 0Ah.
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