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Application Note 9840
HSP-EVAL/HSP45116
NCOM EVALUATION BOARD
OR A DATA GENERATOR
HI5628EVAL1
DAC MODULE
HI5628
CLOCK
CIRCUIT
HSP-EVAL/HSP45116DB
NUMERICALLY
CONTROLLED
8 BITS
I CHANNEL
OSCILLATOR
EVAL KIT
8 BITS
Q CHANNEL
PC INTERFACE
+5V
POWER
SUPPLY
+5V
POWER
SUPPLY
50 ?
SMA
CABLE
SOFTWARE
INCLUDED
WITH HSP-EVAL
SPECTRUM ANALYZER
IBM COMPATIBLE PERSONAL COMPUTER
FIGURE 2. INTERSIL HI5628/DDS EVALUATION SYSTEM SETUP BLOCK DIAGRAM
Appendix A Description of Architecture
The segmented current source architecture has the ability to
improve the converter’s performance by reducing the amount
of current that is switching at any one time. In traditional
architectures, major transition points required the converter
to switch on or off large amounts of current. In a traditional 8-
bit R/2R ladder design, for example, the midscale transition
required equal amounts of currents switching on and off. In a
segmented current source arrangement, transitions such as
midscale become one in which you simply have an additional
intermediate current source turning on and several minor
ones turning off. In the case of the HI5628, there are 31
intermediate current segments that represent the 5 MSBs
and 3, binary-weighted current sources representing each of
the 3 LSBs. See the Functional Block Diagram in the data
sheet for a visual representation. To relate the midscale
transition example to the HI5628, consider the following:
5
Code 01111111 would be represented by 15 intermediate
current segments and each of the 3 LSB current sources all
turned on. To transition to code 10000000 would simply
require turning off the 3 LSB current sources and turning on
the next intermediate current segment, bringing the total
amount of current switching at this ‘major’ code transition
equal to the same amount switching at 30 other code
transition points in the code ramp from 0 to 255, so that the
total glitch energy is distributed more evenly.
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相关PDF资料
HI5662EVAL2 EVALUATION PLATFORM HI5662
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HI5728EVAL1 EVALUATION PLATFORM TQFPHI5728
HI5731-EVS EVALUATION PLATFORM SOIC HI5731
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HI5760EVAL1 EVALUATION PLATFORM SOIC HI5760
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相关代理商/技术参数
HI5628IN 功能描述:DAC DUAL 8BIT 125MSPS 48LQFP RoHS:否 类别:集成电路 (IC) >> 数据采集 - 数模转换器 系列:- 标准包装:2,400 系列:- 设置时间:- 位数:18 数据接口:串行 转换器数目:3 电压电源:模拟和数字 功率耗散（最大）:- 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:36-TFBGA 供应商设备封装:36-TFBGA 包装:带卷 (TR) 输出数目和类型:* 采样率（每秒）:*
HI5628INZ 功能描述:数模转换器- DAC D/A DL 8-BIT 125MSPS 48 LQFP IND TEMP RoHS:否 制造商:Texas Instruments 转换器数量:1 DAC 输出端数量:1 转换速率:2 MSPs 分辨率:16 bit 接口类型:QSPI, SPI, Serial (3-Wire, Microwire) 稳定时间:1 us 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-14 封装:Tube
HI5630 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Triple 8-Bit, 80MSPS A/D Converter with Internal Voltage Reference
HI5630/8CN 制造商:Rochester Electronics LLC 功能描述:- Bulk
HI5630/8CN WAF 制造商:Harris Corporation 功能描述:
HI5630_03 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Triple 8-Bit, 80MSPS A/D Converter with Internal Voltage Reference
HI5630CN 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Triple 8-Bit, 80MSPS A/D Converter with Internal Voltage Reference
HI5630EVAL 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Triple 8-Bit, 80MSPS A/D Converter with Internal Voltage Reference