ADI公司的AD9914是集成了12位DAC 3.5 GSPS直接數字合成器(DDS),采用先進的DDS技術,和高速高性 DAC一起組成數字可編程完整的高頻合成器,能產生高達1.4GHz的模擬輸出正弦波,調頻分辨率190 pHz,16位調相分辨率,可編程模數,自動線性和非線性掃頻功能,32位并行數據通路接口,相位噪音−128 dBc/Hz ,寬帶SFDR小于-50dBc,主要用于LO頻率合成,可編程時鐘發生器,用于雷達和掃描系統的FM調頻脈沖,測試和測量設備,極性調制器,快速跳頻和聲光器件驅動器等.本文介紹了AD9914主要特性,框圖和功能框圖,以及AD9914評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評估板外形圖

圖4.AD9914評估板電路圖(1)

圖5.AD9914評估板電路圖(2)

圖6.AD9914評估板電路圖(3)

AD9914評估板材料清單見:
AD9914評估板材料清單.xls

詳情請見:
http://www.analog.com/static/imported-files/data_sheets/AD9914.pdf
和
http://www.analog.com/static/imported-files/eval_boards/AD9914_Schematic.pdf