ADI公司的AD9914是集成了12位DAC 3.5 GSPS直接數(shù)字合成器(DDS),采用先進(jìn)的DDS技術(shù),和高速高性 DAC一起組成數(shù)字可編程完整的高頻合成器,能產(chǎn)生高達(dá)1.4GHz的模擬輸出正弦波,調(diào)頻分辨率190 pHz,16位調(diào)相分辨率,可編程模數(shù),自動(dòng)線性和非線性掃頻功能,32位并行數(shù)據(jù)通路接口,相位噪音−128 dBc/Hz ,寬帶SFDR小于-50dBc,主要用于LO頻率合成,可編程時(shí)鐘發(fā)生器,用于雷達(dá)和掃描系統(tǒng)的FM調(diào)頻脈沖,測試和測量設(shè)備,極性調(diào)制器,快速跳頻和聲光器件驅(qū)動(dòng)器等.本文介紹了AD9914主要特性,框圖和功能框圖,以及AD9914評(píng)估板電路圖和材料清單(BOM).
The AD9914 is a direct digital synthesizer (DDS) featuring a 12-bit DAC. The AD9914 uses advanced DDS technology, coupled with an internal high speed, high performance DAC to form a digitally programmable, complete high frequency synthesizer capable of generating a frequency-agile analog output sinusoidal waveform at up to 1.4 GHz. The AD9914 enables fast frequency hopping and fine tuning resolution (64-bit capable using programmable modulus mode). The AD9914 also offers fast phase and amplitude hopping capability. The frequency tuning and control words are loaded into the AD9914 via a serial or parallel I/O port. The AD9914 also supports a user defined linear sweep mode of operation for generating linear swept waveforms of frequency, phase, or amplitude. A high speed, 32-bit parallel data input port is included, enabling high data rates for polar modulation schemes and fast reprogramming of the phase, frequency, and amplitude tuning words.
The AD9914 is specified to operate over the extended industrial temperature range.
AD9914主要特性:
3.5 GSPS internal clock speed
Integrated 12-bit DAC
Frequency tuning resolution to 190 pHz
16-bit phase tuning resolution
12-bit amplitude scaling
Programmable modulus
Automatic linear and nonlinear frequency sweeping capability
32-bit parallel datapath interface
8 frequency/phase offset profiles
Phase noise: −128 dBc/Hz (1 kHz offset at 1396 MHz)
Wideband SFDR < −50 dBc
Serial or parallel I/O control
1.8 V/3.3 V power supplies
Software and hardware controlled power-down
88-lead LFCSP package
PLL REF CLK multiplier
Phase modulation capability
Amplitude modulation capability
AD9914應(yīng)用:
Agile LO frequency synthesis
Programmable clock generator
FM chirp source for radar and scanning systems
Test and measurement equipment
Acousto-optic device drivers
Polar modulator
Fast frequency hopping
圖1.AD9914方框圖
圖2.AD9914功能框圖
AD9914評(píng)估板
This user guide describes how to set up and use the AD9914evaluation board. The AD9914 is a 3.5 GSPS DDS with a 12-bit DAC.
The evaluation board software provides a graphical user interface (GUI) for easy communication with the device along with many user-friendly features such as the mouse-over effect.
This user guide is intended for use in conjunction with the AD9914 data sheet.
圖3.AD9914評(píng)估板外形圖
圖4.AD9914評(píng)估板電路圖(1)
圖5.AD9914評(píng)估板電路圖(2)
圖6.AD9914評(píng)估板電路圖(3)
AD9914評(píng)估板材料清單見:
AD9914評(píng)估板材料清單.xls
詳情請(qǐng)見:
http://www.analog.com/static/imported-files/data_sheets/AD9914.pdf
和
http://www.analog.com/static/imported-files/eval_boards/AD9914_Schematic.pdf
