參數(shù)資料
型號(hào): ADF4360-8BCPZ
廠商: Analog Devices Inc
文件頁(yè)數(shù): 16/24頁(yè)
文件大?。?/td> 0K
描述: IC SYNTHESIZER VCO 24-LFCSP
標(biāo)準(zhǔn)包裝: 1
類(lèi)型: 扇出配送,整數(shù)-N,合成器(RF)
PLL:
輸入: CMOS,TTL
輸出: 時(shí)鐘
電路數(shù): 1
比率 - 輸入:輸出: 1:2
差分 - 輸入:輸出: 無(wú)/無(wú)
頻率 - 最大: 400MHz
除法器/乘法器: 是/無(wú)
電源電壓: 3 V ~ 3.6 V
工作溫度: -40°C ~ 85°C
安裝類(lèi)型: 表面貼裝
封裝/外殼: 24-VFQFN 裸露焊盤(pán),CSP
供應(yīng)商設(shè)備封裝: 24-LFCSP-VQ(4x4)
包裝: 托盤(pán)
配用: EVAL-ADF4360-8EBZ1-ND - BOARD EVALUATION FOR ADF4360-8
ADF4360-8
Rev. A | Page 23 of 24
OUTPUT MATCHING
There are a number of ways to match the output of the
ADF4360-8 for optimum operation; the most basic is to use a
50 resistor to VVCO. A dc bypass capacitor of 100 pF is
connected in series, as shown in Figure 27. Because the resistor
is not frequency dependent, this provides a good broadband
match. The output power in the circuit below typically gives
9 dBm output power into a 50 load.
100pF
04763-030
RFOUT
VVCO
50
51
Figure 27. Simple ADF4360-8 Output Stage
A better solution is to use a shunt inductor (acting as an RF
choke) to VVCO. This gives a better match and, therefore, more
output power.
Experiments have shown that the circuit shown in Figure 28
provides an excellent match to 50 over the operating range of
the ADF4360-8. This gives approximately 0 dBm output power
across the specific frequency range of the ADF4360-8 using the
recommended shunt inductor, followed by a 100 pF dc blocking
capacitor.
L
100pF
04763-031
RFOUT
VVCO
50
Figure 28. Optimum ADF4360-8 Output Stage
The recommended value of this inductor changes with the VCO
center frequency. A graph of the optimum inductor value vs.
frequency is shown in Figure 29.
CENTRE FREQUENCY (MHz)
INDUCTANCE
(nH)
300
250
150
200
100
0
50
0
100
200
300
5000
400
04763-032
Figure 29. Optimum ADF4360-8 Shunt Inductor
Both complementary architectures can be examined using the
EVAL-ADF4360-8EB1 evaluation board. If the user does not
need the differential outputs available on the ADF4360-8, the
user should either terminate the unused output or combine
both outputs using a balun. Alternatively, instead of the LC
balun, both outputs may be combined using a 180° rat-race
coupler.
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