參數(shù)資料
型號(hào): ADF4154BRUZ
廠商: Analog Devices Inc
文件頁(yè)數(shù): 2/24頁(yè)
文件大?。?/td> 0K
描述: IC FRAC-N FREQ SYNTH 16-TSSOP
標(biāo)準(zhǔn)包裝: 96
類型: 分?jǐn)?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: 2:1
差分 - 輸入:輸出: 是/無(wú)
頻率 - 最大: 4GHz
除法器/乘法器: 無(wú)/是
電源電壓: 2.7 V ~ 3.3 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 16-TSSOP(0.173",4.40mm 寬)
供應(yīng)商設(shè)備封裝: 16-TSSOP
包裝: 管件
產(chǎn)品目錄頁(yè)面: 551 (CN2011-ZH PDF)
配用: EVAL-ADF4154EBZ1-ND - BOARD EVALUATION FOR ADF4154EB1
ADF4154
Data Sheet
Rev. C | Page 10 of 24
MUXOUT AND LOCK DETECT
The output multiplexer on the ADF4154 allows the user to
access various internal points on the chip. The state of
MUXOUT is controlled by M3, M2, and M1 (see Table 8).
Figure 18 shows the MUXOUT section in block diagram form.
The N-channel, open-drain, analog lock detect should be
operated with an external pull-up resistor of 10 k nominal.
When lock has been detected, the lock detect is high with
narrow low-going pulses.
R-DIVIDER OUTPUT
N-DIVIDER OUTPUT
ANALOG LOCK DETECT
DGND
CONTROL
MUX
MUXOUT
DVDD
LOGIC LOW
FAST-LOCK CONTROL
THREE-STATE OUTPUT
DIGITAL LOCK DETECT
04833-
018
LOGIC HIGH
Figure 18. MUXOUT Schematic
INPUT SHIFT REGISTERS
The ADF4154 digital section includes a 4-bit R value, a 9-bit
RF N value, a 12-bit RF FRAC value, and a 12-bit interpolator
modulus value/fast-lock timer. Data is clocked MSB first into
the 24-bit shift register on each rising edge of CLK.
Data is transferred from the shift register to one of four latches
on the rising edge of LE. The destination latch is determined by
the state of the two control bits (C2 and C1) in the shift register.
These are the two LSBs, DB1 and DB0, as shown in Figure 2.
The truth table for these bits is shown in Table 5. Table 6 shows
a summary of how the latches are programmed.
PROGRAM MODES
Table 5 through Table 9 show how to set up the program modes
in the ADF4154.
The ADF4154 programmable modulus is double buffered,
meaning that two events must occur before the part can use a
new modulus value. The first event is that the new modulus value
must be latched into the device by writing to the R-divider register,
and the second event is that a new write must be performed on
the N-divider register. Therefore, whenever the modulus value
is updated, the N-divider register must be written to so that the
modulus value is loaded correctly.
Table 5. C2 and C1 Truth Table
Control Bits
C2
C1
Data Latch
0
N-divider register
0
1
R-divider register
1
0
Control register
1
Noise and spur register
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