參數(shù)資料
型號(hào)： AD9956YCPZ1
廠商： Analog Devices, Inc.
英文描述： 2.7 GHz DDS-Based AgileRF
中文描述： 2.7千兆赫基于DDS的AgileRF
文件頁(yè)數(shù)： 17/32頁(yè)
文件大?。?/td> 805K
代理商： AD9956YCPZ1
AD9956
Rev. 0 | Page 17 of 32
DAC
CHARGE
PUMP
REF
OSC
DDS
÷
N
÷
M
÷
R
LPF
VCO
CML
DRIVER
PHASE FREQUENCY
DETECTOR
EXTERNAL
REFERENCE
622MHz
CLOCK1
CLOCK2
AD9956
0
Figure 25. Optical Networking Clock
CHARGE
PUMP
PLLREF
PLLOSC
÷
N
VCO
DAC
DDS
PHASE
FREQUENCY
DETECTOR
≤
650MHz
0
LPF
LPF
Figure 26. Direct Upconversion
APPLICATION CIRCUIT EXPLANATIONS
Dual-Clock Configuration
In this loop, M = 1, N = 16, and R = 4. The DDS tuning word is
also equal to so that the frequency of CLOCK 1’ equals the
frequency of CLOCK 1. Phase adjustments in the DDS provide
a 14-bit programmable rising edge skew capability of CLOCK 1’
with respect to CLOCK 1 (see Figure 22).
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 23).
LO and Baseband Modulation Generation
Using the AD9956’s PLL section to generate an LO and the
DDS portion to generate a modulated baseband, this circuit
uses an external mixer to perform some simple modulation at
RF frequencies (see Figure 24).
Optical Networking Clock
This is the AD9956 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 25).
Direct Upconversion
The AD9956 is configured to use the DDS as a precision refer-
ence to the PLL loop. Since the VCO is < 655 MHz, it can be fed
straight into the phase frequency detector feedback input (with
the divider enabled), as seen in Figure 26.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AD9956YCPZ-REEL1 制造商:AD 制造商全稱:Analog Devices 功能描述:2.7 GHz DDS-Based AgileRF
AD9956YCPZ-REEL7 功能描述:IC SYNTHESIZER 1.8V 48LFCSP RoHS:是 類別:集成電路 (IC) >> 接口 - 直接數(shù)字合成 (DDS) 系列:- 產(chǎn)品變化通告:Product Discontinuance 27/Oct/2011 標(biāo)準(zhǔn)包裝:2,500 系列:- 分辨率（位）:10 b 主 fclk:25MHz 調(diào)節(jié)字寬（位）:32 b 電源電壓:2.97 V ~ 5.5 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:帶卷 (TR)
AD9957 制造商:AD 制造商全稱:Analog Devices 功能描述:1 GSPS Quadrature Digital Upconverter with 18-Bit IQ Data Path and 14-Bit DAC
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AD9957_07 制造商:AD 制造商全稱:Analog Devices 功能描述:1 GSPS Quadrature Digital Upconverter with 18-Bit IQ Data Path and 14-Bit DAC
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