參數(shù)資料
型號: ADF4360-8BCPZRL7
廠商: Analog Devices Inc
文件頁數(shù): 9/24頁
文件大?。?/td> 0K
描述: IC SYNTHESIZER VCO 24-LFCSP
標準包裝: 1
類型: 扇出配送,整數(shù)-N,合成器(RF)
PLL:
輸入: CMOS
輸出: 時鐘
電路數(shù): 1
比率 - 輸入:輸出: 1:2
差分 - 輸入:輸出: 無/無
頻率 - 最大: 400MHz
除法器/乘法器: 是/無
電源電壓: 3 V ~ 3.6 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 24-VFQFN 裸露焊盤,CSP
供應商設備封裝: 24-LFCSP-VQ(4x4)
包裝: 標準包裝
產(chǎn)品目錄頁面: 551 (CN2011-ZH PDF)
其它名稱: ADF4360-8BCPZRL7DKR
ADF4360-8
Rev. A | Page 17 of 24
POWER-UP
Power-Up Sequence
The correct programming sequence for the ADF4360-8 after
power-up is
1.
R counter latch
2.
Control latch
3.
N counter latch
Initial Power-Up
Initial power-up refers to programming the part after the
application of voltage to the AVDD, DVDD, VVCO, and CE pins. On
initial power-up, an interval is required between programming
the control latch and programming the N counter latch. This
interval is necessary to allow the transient behavior of the
ADF4360-8 during initial power-up to settle.
During initial power-up, a write to the control latch powers up
the part, and the bias currents of the VCO begin to settle. If
these currents have not settled to within 10% of their steady-
state value, and if the N counter latch is then programmed, the
VCO may not oscillate at the desired frequency, which does not
allow the band select logic to choose the correct frequency
band, and the ADF4360-8 may not achieve lock. If the recom-
mended interval is inserted, and the N counter latch is pro-
grammed, the band select logic can choose the correct fre-
quency band, and the part locks to the correct frequency.
The duration of this interval is affected by the value of the
capacitor on the CN pin (Pin 14). This capacitor is used to
reduce the close-in noise of the ADF4360-8 VCO. The
recommended value of this capacitor is 10 F. Using this value
requires an interval of ≥15 ms between the latching in of the
control latch bits and latching in of the N counter latch bits. If a
shorter delay is required, the capacitor can be reduced. A slight
phase noise penalty is incurred by this change, which is further
explained in Table 10.
Table 10. CN Capacitance vs. Interval and Phase Noise
CN Value
Recommended Interval
Between Control Latch
and N Counter Latch
Open-Loop Phase Noise
@ 10 kHz Offset
(L1 and L2 = 18.0 nH)
Open-Loop Phase Noise
@ 10 kHz Offset
(L1 and L2 = 110.0 nH)
Open-Loop Phase Noise
@ 10 kHz Offset
(L1 and L2 = 560.0 nH)
10 F
≥15 ms
100 dBc/Hz
97 dBc/Hz
99 dBc/Hz
440 nF
≥ 600 s
99 dBc/Hz
96 dBc/Hz
98 dBc/Hz
CLOCK
POWER-UP
DATA
LE
R COUNTER
LATCH DATA
CONTROL
LATCH DATA
N COUNTER
LATCH DATA
REQUIRED INTERVAL
CONTROL LATCH WRITE TO
N COUNTER LATCH WRITE
04763-033
Figure 21. ADF4360-8 Power-Up Timing
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