參數(shù)資料
型號(hào)： AD9540-VCO/PCBZ
廠商： Analog Devices Inc
文件頁數(shù)： 10/32頁
文件大小： 0K
描述： BOARD EVAL CLK GEN SYNTH 48LFCSP
設(shè)計(jì)資源： AD9540 Eval Brd Schematics
AD9540 Eval Brd BOM
AD9540 Gerber Files
標(biāo)準(zhǔn)包裝： 1
主要目的： 計(jì)時(shí)，時(shí)鐘發(fā)生器
已用 IC / 零件： AD9540
已供物品： 板
AD9540
Rev. A | Page 18 of 32
04947-046
REFIN
CLK2
CP_OUT
DDS
÷R
VCO
AD9540
LPF
DAC
÷N
CML
DRIVER
2.5GHz
TONE
8-LEVEL FSK
(FC = 100MHz)
BPF
25MHz
CRYSTAL
Figure 36. ISM Band Modulator (LO & Baseband Generation)
APPLICATION CIRCUIT DESCRIPTIONS
Dual Clock Configuration
In this loop, M = 1, N = 16, and R = 4. The DDS (direct digital
synthesizer) tuning word is also equal to , so that the
frequency of CLOCK1’ equals the frequency of CLOCK 1.
Phase adjustments in the DDS provide 14-bit programmable
rising edge delay capability of CLOCK1’ with respect to
CLOCK1 (see Figure 32).
Optical Networking Clock
This is the AD9540 configured as an optical networking clock.
The loop can be used to generate a 622 MHz clock for OC12.
The DDS can be programmed to output 8 kHz to serve as a base
reference for other circuits in the subsystem (see Figure 33).
Fractional-Divider Loop
This loop offers the precise frequency
division (48-bit) of the DDS in the feedback path as well as the
frequency sweeping capability of the DDS. Programming the
DDS to sweep from 24 MHz to 25 MHz sweeps the output of
the VCO from 2.7 GHz to 2.6 GHz. The reference in this case is
a simple crystal (see Figure 34).
Direct Upconversion
The AD9540 is configured to use the DDS as a precision
reference to the PLL. Since the VCO is <655 MHz, it can be fed
straight into the phase frequency detector feedback.
LO and Baseband Modulation Generation
Using the AD9540 PLL section to generate LO and the DDS
portion to generate a modulated baseband, this circuit uses an
external mixer to perform some simple modulation at RF ISM
band frequencies (see Figure 36).
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AD9542/PCBZ
AD9542BCPZ 功能描述:SYNCHRONIZER & ADAPTIVE CLOCK TR 制造商:analog devices inc. 系列:* 包裝:托盤 零件狀態(tài):在售 安裝類型:表面貼裝 封裝/外殼:64-WFQFN 裸露焊盤 供應(yīng)商器件封裝:64-LFCSP（9x9） 標(biāo)準(zhǔn)包裝:1
AD9542BCPZ-REEL7 功能描述:SYNCHRONIZER & ADAPTIVE CLOCK TR 制造商:analog devices inc. 系列:* 包裝:帶卷（TR） 零件狀態(tài):在售 安裝類型:表面貼裝 封裝/外殼:64-WFQFN 裸露焊盤 供應(yīng)商器件封裝:64-LFCSP（9x9） 標(biāo)準(zhǔn)包裝:750
AD9543/PCBZ 功能描述:EVALUATION BOARD AD9543 制造商:analog devices inc. 系列:- 零件狀態(tài):在售 主要用途:計(jì)時(shí)，時(shí)鐘同步器 嵌入式:- 使用的 IC/零件:AD9543 主要屬性:- 輔助屬性:圖形用戶界面 所含物品:板 標(biāo)準(zhǔn)包裝:1
AD9543BCPZ 功能描述:BBU DERIVATIVE FOR AD9545 制造商:analog devices inc. 系列:- 包裝:托盤 零件狀態(tài):在售 類型:時(shí)鐘同步器 PLL:是 輸入:差分或單端 輸出:CML、HCSL、LVDS 或單端 電路數(shù):2 比率 - 輸入:輸出:4：10 差分 - 輸入:輸出:是/是 頻率 - 最大值:2.4GHz 分頻器/倍頻器:是/無 電壓 - 電源:1.71 V ~ 3.465 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-WFQFN 裸露焊盤，CSP 供應(yīng)商器件封裝:48-LFCSP（7x7） 標(biāo)準(zhǔn)包裝:1
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