收藏本站
UG-266
SELECT EXTERNAL MCLK FREQUENCY
Having selected the digital interface specifics, next use the
EXTERNAL MCLK box to choose which frequency to use. The
boards are supplied with a 75 MHz general oscillator. If a different
clock source is required, the CLK1 SMB connector can be used
to supply a different MCLK value.
Two options for the general oscillator include the AEL3013
oscillators from AEL Crystals and the SG-310SCN oscillators
from Epson Electronics.
Figure 6. EXTERNAL MCLK Input
PROGRAMMING METHOD: HARDWARE OR
SOFTWARE
Functions that select frequency and phase registers, reset internal
registers, and power down the DAC can be implemented using
either software or hardware. Figure 7 shows how to select the
source of control for these functions. PIN/SW = 1 implies that
the functions are being controlled using the appropriate
hardware control pins. PIN/SW = 0 implies that the functions
are being controlled using the appropriate software control bits.
Figure 7. Programming method
LOADING FREQUENCY AND PHASE REGISTERS
The desired output frequency and output phase can be loaded
using the inputs shown in Figure 8. Either the FREQ 0 register or
the FREQ 1 register can be loaded with frequency data. The
frequency data is loaded in megahertz, and the equivalent hex
code is shown to the right once data is entered; click Enter to load
the data. Once data is loaded, the output will appear on the IOUT
and IOUTB pins. Similarly, either the PHASE 0 register or the
Evaluation Board User Guide
The analog output frequency from the AD9834 is defined by
f MCLK /2 28 × FREQREG
where FREQREG is the value loaded into the selected frequency
register in decimals. This signal is phase shifted by
2π/4096 × PHASEREG
where PHASEREG is the value contained in the selected phase
register in decimals.
Figure 8. Frequency and Phase Load
FSK AND PSK FUNCTIONALITY
In software mode, the AD9834 can be setup for FSK or PSK
functionality by simply entering the bit rate in milliseconds and
selecting the push-button option (see Figure 9).
Figure 9. FSK and PSK Functionality
WAVEFORM OPTIONS
The output waveform can be selected as a sinusoidal waveform
or a ramp waveform. The internal comparator in the AD9834
can be disabled or enabled (see Figure 10). The MSB or the
MSB/2 of the phase accumulator can be selected as the output
on the SIGN BIT OUT pin.
Figure 10. Waveform Profile and SIGN BIT OUT
PHASE 1 register can be selected, and the phase data is loaded
in degrees.
Rev. A | Page 6 of 16
发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

*型号 *数量 厂商 批号 封装
添加更多采购

我的联系方式

*
*
*
相关PDF资料
EVAL-ADAU1401AEBZ BOARD EVAL FOR ADAU1401A
EVAL-ADCMP564BRQZ BOARD EVALUATION ADCMP564BRQZ
EVAL-ADE7169EBZ-2 BOARD EVALUATION FOR ADE7169F16
EVAL-ADE7751ZEB BOARD EVALUATION FOR ADE7751
EVAL-ADE7752AEBZ BOARD EVALUATION FOR ADE7752A
EVAL-ADE7753ZEB BOARD EVALUATION AD7753
EVAL-ADE7754EBZ BOARD EVALAUTION FOR ADE7754
EVAL-ADE7755ZEB BOARD EVALUATION FOR AD7755
相关代理商/技术参数
EVAL-AD9835EBZ 功能描述:BOARD EVALUATION FOR AD9835 RoHS:是 类别:编程器，开发系统 >> 评估演示板和套件 系列:- 标准包装:1 系列:- 主要目的:电信，线路接口单元（LIU） 嵌入式:- 已用 IC / 零件:IDT82V2081 主要属性:T1/J1/E1 LIU 次要属性:- 已供物品:板，电源，线缆，CD 其它名称:82EBV2081
EVAL-AD9835SDZ 功能描述:BOARD EVAL FOR AD9835 RoHS:是 类别:编程器，开发系统 >> 评估演示板和套件 系列:- 标准包装:1 系列:- 主要目的:电信，线路接口单元（LIU） 嵌入式:- 已用 IC / 零件:IDT82V2081 主要属性:T1/J1/E1 LIU 次要属性:- 已供物品:板，电源，线缆，CD 其它名称:82EBV2081
EVAL-AD9837SDZ 功能描述:BOARD EVAL FOR AD9837 RoHS:是 类别:编程器，开发系统 >> 评估演示板和套件 系列:- 标准包装:1 系列:- 主要目的:电信，线路接口单元（LIU） 嵌入式:- 已用 IC / 零件:IDT82V2081 主要属性:T1/J1/E1 LIU 次要属性:- 已供物品:板，电源，线缆，CD 其它名称:82EBV2081
EVAL-AD9838SDZ 功能描述:BOARD EVAL FOR AD9838 RoHS:是 类别:编程器，开发系统 >> 评估演示板和套件 系列:- 标准包装:1 系列:- 主要目的:电信，线路接口单元（LIU） 嵌入式:- 已用 IC / 零件:IDT82V2081 主要属性:T1/J1/E1 LIU 次要属性:- 已供物品:板，电源，线缆，CD 其它名称:82EBV2081
EVAL-AD9880-ABZ 功能描述:KIT MODULE VIDEO INPUT AD9880 RoHS:是 类别:编程器，开发系统 >> 评估演示板和套件 系列:- 标准包装:1 系列:PCI Express® (PCIe) 主要目的:接口，收发器，PCI Express 嵌入式:- 已用 IC / 零件:DS80PCI800 主要属性:- 次要属性:- 已供物品:板
EVAL-ADAS1000EBZU1 功能描述:EVAL BOARD ADAS1000 ECG AFE RoHS:是 类别:编程器，开发系统 >> 评估演示板和套件 系列:* 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:- 主要目的:电源管理，电池充电器 嵌入式:否 已用 IC / 零件:MAX8903A 主要属性:1 芯锂离子电池 次要属性:状态 LED 已供物品:板
EVAL-ADAS1000SDZ 功能描述:数据转换 IC 开发工具 EVALUATION BOARD RoHS:否 制造商:Texas Instruments 产品:Demonstration Kits 类型:ADC 工具用于评估:ADS130E08 接口类型:SPI 工作电源电压:- 6 V to + 6 V
EVAL-ADAS1000SDZU3 制造商:Analog Devices 功能描述:EVALUATION KIT - Boxed Product (Development Kits)