参数资料
| 型号： | AD9879BSZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 16/32页 |
| 文件大小： | 0K |
| 描述： | IC PROCESSOR FRONT END 100MQFP |
| 标准包装： | 1 |
| 位数： | 12 |
| 通道数： | 5 |
| 功率（瓦特）： | 587mW |
| 电压 - 电源，模拟： | 3.3V |
| 电压 - 电源，数字： | 3.3V |
| 封装/外壳： | 100-BQFP |
| 供应商设备封装： | 100-MQFP（14x20） |
| 包装： | 托盘 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页当前第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页
AD9879
Rev. A | Page 23 of 32
02773-015
FREQUENCY RELATIVE TO I/Q NYQUIST BW
0
1.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
0
MAGNITUDE
(dB)
–1
–2
–3
–4
–5
–6
Figure 15. Cascaded Filter Pass-Band Detail (N = 4)
02773-016
FREQUENCY RELATIVE TO I/Q NYQUIST BW
0
1.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
0
MAGNITUDE
(dB)
–1
–2
–3
–4
–5
–6
Figure 16. Cascaded Filter Pass-Band Detail (N = 3)
To keep the bandwidth of the data in the flat portion of the filter
pass band, the user must oversample the baseband data by at
least a factor of two prior to representing it to the AD9879.
Without oversampling, the Nyquist bandwidth of the baseband
data corresponds to the fNYQ. Consequently, the upper end of the
data bandwidth suffers 6 dB or more of attenuation due to the
frequency response of the digital filters.
There is an additional concern if the baseband data applied to
the AD9879 has been pulse shaped. Typically, pulse shaping is
applied to the baseband data via a filter having a raised cosine
response. In such cases, an α value is used to modify the
bandwidth of the data where the value of α is such that 0 < α <
1. A value of 0 causes the data bandwidth to correspond to the
Nyquist bandwidth. A value of 1 causes the data bandwidth to
be extended to twice the Nyquist bandwidth.
Thus, with 2× oversampling of the baseband data and α =1,
the Nyquist bandwidth of the data corresponds with the I/Q
Nyquist bandwidth.
As stated earlier, this results in problems near the upper edge of
the data bandwidth due to the frequency response of the filters.
The maximum value of α that can be implemented is 0.45. This
is because the data bandwidth becomes:
()
NYQ
f
α
725
.
0
1
2
1
=
+
(16)
which puts the data bandwidth at the extreme edge of the flat
portion of the filter response.
If a particular application requires an α value between 0.45 and
1, then the user must oversample the baseband data by at least a
factor of four. The combined HBF1, HBF2, and CIC filter
introduces a worst-case droop of less than 0.2 dB over the
frequency range of the data to be transmitted.
相关PDF资料 |
PDF描述 |
|---|---|
| AD9901KQ | IC PHASE/FREQ DISCRIMR 14-CDIP |
| AD9920ABBCZRL | IC PROCESSOR CCD 12BIT 105CSPBGA |
| AD9978BCPZRL | IC PROCESSOR CCD 14BIT 40-LFCSP |
| ADADC71KD | IC ADC 16BIT HIGH RES 32-CDIP |
| ADADC80-Z-12 | IC ADC 12BIT INTEGRATED 32-CDIP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AD9879BSZKL1 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Analog Devices 功能描述: |
| AD9879-EB | 制造商:Analog Devices 功能描述:Evaluation Board For Mixed Signal Front End Set Top Box, Cable Modem 制造商:Analog Devices 功能描述:DEV TOOLS, MIXED SGNL FRONT END SET TOP , CBL MODEM - Bulk |
| AD9880 | 制造商:Analog Devices 功能描述:AUDIO PROCESSOR - Bulk |
| AD9880/PCB | 制造商:AD 制造商全称:Analog Devices 功能描述:Analog/HDMI Dual Display Interface |
| AD9880/PCBZ | 功能描述:KIT EVALUATION AD9880 RoHS:是 类别:编程器，开发系统 >> 评估演示板和套件 系列:Advantiv® 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 |
发布紧急采购，3分钟左右您将得到回复。