ADI AD9838 11mW 75MHz DDS解决方案
ADI公司的AD9838是75MHz 的直接数字频率合成器(DDS),工作电压2.3V-5.5V,在2.3V时的功耗仅为11mW,输出频率高达8MHz,分辨率达0.02 Hz,正弦波和三角波输出,3线SPI接口,主要用在频率激励/波形发生,频率相位调整和调制,低功耗RF/通信系统,液体和气体流量测量,传感器应用以及测量与医疗设备.本文介绍了AD9838主要特性, 功能方框图
EVAL-AD9838SDZ评估板主要特性,方框图,电路图以及材料清单和PCB元件布局.
AD9838:11 mW Power, 2.3 V to 5.5 V, 75 MHz Complete DDS
The AD9838 is a low power DDS device capable of producing high performance sine and triangular outputs. It also has an on-board comparator that allows a square wave to be produced for clock generation. Consuming only 11 mW of power at 2.3 V, the AD9838 is an ideal candidate for power-sensitive applications.
Capability for phase modulation and frequency modulation is provided. The frequency registers are 28 bits wide: with a 16 MHz clock rate, resolution of 0.06 Hz can be achieved; with a 5 MHz clock rate, the AD9838 can be tuned to 0.02 Hz resolution. Frequency and phase modulation are configured by loading registers through the serial interface and by toggling the registers using software or the FSELECT and PSELECT pins, respectively.
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