ADI公司的AD9914是集成了12位DAC 3.5 GSPS直接数字合成器(DDS),采用先进的DDS技术,和高速高性 DAC一起组成数字可编程完整的高频合成器,能产生高达1.4GHz的模拟输出正弦波,调频分辨率190 pHz,16位调相分辨率,可编程模数,自动线性和非线性扫频功能,32位并行数据通路接口,相位噪音−128 dBc/Hz ,宽带SFDR小于-50dBc,主要用于LO频率合成,可编程时钟发生器,用于雷达和扫描系统的FM调频脉冲,测试和测量设备,极性调制器,快速跳频和声光器件驱动器等.本文介绍了AD9914主要特性,框图和功能框图,以及AD9914评估板电路图和材料清单(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应用:

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

图1.AD9914方框图


 图2.AD9914功能框图

AD9914评估板

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.


图3.AD9914评估板外形图

图4.AD9914评估板电路图(1)

图5.AD9914评估板电路图(2)

图6.AD9914评估板电路图(3)

AD9914评估板材料清单见:
AD9914评估板材料清单.xls

详情请见:
http://www.analog.com/static/imported-files/data_sheets/AD9914.pdf
和
http://www.analog.com/static/imported-files/eval_boards/AD9914_Schematic.pdf