- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄9093 > ADF4158CCPZ-RL7 (Analog Devices Inc)IC FRACTION N FREQ SYNT 24LFCSP PDF資料下載
參數(shù)資料
| 型號： | ADF4158CCPZ-RL7 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 26/36頁 |
| 文件大小： | 0K |
| 描述： | IC FRACTION N FREQ SYNT 24LFCSP |
| 標準包裝： | 1,500 |
| 類型： | 分數(shù) N 合成器（RF） |
| PLL： | 是 |
| 輸入： | CMOS，TTL |
| 輸出： | 時鐘 |
| 電路數(shù)： | 1 |
| 比率 - 輸入:輸出： | 2:1 |
| 差分 - 輸入:輸出： | 是/無 |
| 頻率 - 最大： | 6.1GHz |
| 除法器/乘法器： | 是/是 |
| 電源電壓： | 2.7 V ~ 3.3 V |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 24-WFQFN 裸露焊盤，CSP |
| 供應商設備封裝： | 24-LFCSP-WQ（4x4） |
| 包裝： | 帶卷 (TR) |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁當前第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁
ADF4158
Data Sheet
Rev. G | Page 32 of 36
FAST LOCK MODE
The ADF4158 can operate in fast lock mode. In this mode, the
charge pump current is boosted and additional resistors are
connected to maintain the stability of the loop.
Fast Lock Timer and Register Sequences
When fast lock mode is enabled (Register R4, DB[20:19]), after
a write to Register R0, the PLL operates in a wide bandwidth
mode for a selected amount of time. Before fast lock is enabled,
the initialization sequence must be performed after the part is
first powered up (see the Initialization Sequence section). The
time in bandwidth mode is set by:
CLK1 × CLK2/fPFD = Time in Wide Bandwidth
where:
CLK1 = Register R2, DB[14:3].
CLK2 = Register R4, DB[18:7].
fPFD = the PFD frequency.
Note that the fast lock feature does not work in ramp mode.
Fast Lock Example
In this example, the PLL has fPFD of 100 MHz and requires being
in wide bandwidth mode for 12 μs.
CLK1 × CLK2/fPFD = 12 μs
CLK1 × CLK2 = (12 × 106)(100 × 106) = 1200
Therefore, CLK1 = 12 and CLK2 = 100, which results in 12 μs.
Fast Lock Loop Filter Topology
To use fast lock mode, an extra connection from the PLL to the
loop filter is needed. The damping resistor in the loop filter must
be reduced to of its value in wide bandwidth mode. This
reduction is required because the charge pump current is
increased by 16 in wide bandwidth mode, and stability must be
ensured.
To further enhance stability and mitigate frequency overshoot
during a frequency change in wide bandwidth mode, Resistor R3
is connected (see Figure 46). During fast lock, the SW1 pin is
shorted to ground, and the SW2 pin is connected to CP (set
Bits DB[20:19] in Register R4 to 01 for fast lock divider).
The following two topologies can be used:
Divide the damping resistor (R1) into two values (R1 and
R1A) that have a ratio of 1:3 (see Figure 46).
Connect an extra resistor (R1A) directly from SW1 (see
Figure 47). The extra resistor must be selected such that the
parallel combination of an extra resistor and the damping
resistor (R1) is reduced to of the original value of R1.
For both topologies, the ratio R3:R2 must equal 1:4.
VCO
CP
C1
C2
C3
R3
R2
R1
R1A
SW2
SW1
ADF4158
0
872
8-
0
32
Figure 46. Fast-Lock Loop Filter Topology—Topology 1
VCO
CP
C1
C2
C3
R3
R2
R1
R1A
SW2
SW1
ADF4158
0
872
8-
1
02
Figure 47. Fast-Lock Loop Filter Topology—Topology 2
For more fast lock topologies, see ADIsimPLL.
相關PDF資料 |
PDF描述 |
|---|---|
| X9409WV24-2.7T1 | IC XDCP QUAD 64-TAP 10K 24-TSSOP |
| X9409WS24T1 | IC XDCP QUAD 64-TAP 10K 24-SOIC |
| VE-B5Z-MU-S | CONVERTER MOD DC/DC 2V 80W |
| X9409WS24IT1 | IC XDCP QUAD 64-TAP 10K 24-SOIC |
| VE-B5Y-MU-S | CONVERTER MOD DC/DC 3.3V 132W |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| ADF4158WCCPZ | 功能描述:IC FRAC-N FREQ SYNTH 24LFCSP 制造商:analog devices inc. 系列:- 包裝:托盤 零件狀態(tài):在售 類型:分數(shù) N 合成器（RF） PLL:是 輸入:CMOS，TTL 輸出:時鐘 電路數(shù):1 比率 - 輸入:輸出:2:1 差分 - 輸入:輸出:是/無 頻率 - 最大值:6.1GHz 分頻器/倍頻器:是/是 電壓 - 電源:2.7 V ~ 3.3 V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:24-WFQFN 裸露焊盤 供應商器件封裝:24-LFCSP-WQ（4x4） 標準包裝:1 |
| ADF4158WCCPZ-RL7 | 功能描述:IC FRAC-N FREQ SYNTH 24LFCSP RoHS:是 類別:集成電路 (IC) >> 時鐘/計時 - 時鐘發(fā)生器，PLL，頻率合成器 系列:- 標準包裝:1,000 系列:Precision Edge® 類型:時鐘/頻率合成器 PLL:無 輸入:CML，PECL 輸出:CML 電路數(shù):1 比率 - 輸入:輸出:2:1 差分 - 輸入:輸出:是/是 頻率 - 最大:10.7GHz 除法器/乘法器:無/無 電源電壓:2.375 V ~ 3.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:16-VFQFN 裸露焊盤，16-MLF? 供應商設備封裝:16-MLF?（3x3） 包裝:帶卷 (TR) 其它名稱:SY58052UMGTRSY58052UMGTR-ND |
| ADF4159 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Direct Modulation/Fast Waveform Generating, 13 GHz, Fractional-N Frequency Synthesizer |
| ADF4159CCPZ | 制造商:Analog Devices 功能描述:Fractional-N Frequency Synthesizer 24-Pin LFCSP EP Tray 制造商:Analog Devices 功能描述:DIRECT MODULATION/FAST WAVEFORM GENERATING, 13 GHZ, FRACTION - Trays 制造商:Analog Devices 功能描述:IC PLL FREQ SYNTHESIZER 24LFCSP 制造商:Analog Devices Inc. 功能描述:Phase Locked Loops - PLL |
| ADF4159CCPZ-RL7 | 制造商:Analog Devices 功能描述:Fractional-N Frequency Synthesizer 24-Pin LFCSP EP T/R 制造商:Analog Devices 功能描述:13GHZ FAST RAMP DIRECT MOD FRAC N PLL - Tape and Reel 制造商:Analog Devices Inc. 功能描述:Phase Locked Loops - PLL |
發(fā)布緊急采購，3分鐘左右您將得到回復。