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| 型号： | AD7569BQ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 5/20页 |
| 文件大小： | 0K |
| 描述： | IC I/O PORT 8BIT ANLG 24-CDIP |
| 标准包装： | 15 |
| 系列： | LC²MOS |
| 应用： | 模拟 I/O |
| 接口： | 总线 |
| 电源电压： | 4.75 V ~ 5.25 V |
| 封装/外壳： | 24-CDIP（0.300"，7.62mm） |
| 供应商设备封装： | 24-CDIP |
| 包装： | 管件 |
| 安装类型： | 通孔 |
AD7569/AD7669
–13–
REV. B
Figure 15. DAC Output Spectrum
HISTOGRAM PLOT
When a sine wave of specified frequency is applied to the VIN in-
put of the AD7569/AD7669 and several thousand samples are
taken, it is possible to plot a histogram showing the frequency of
occurrence of each of the 256 ADC codes. If a particular step is
wider than the ideal 1 LSB width, the code associated with that
step will accumulate more counts than for the code for an ideal
step. Likewise, a step narrower than ideal width will have fewer
counts. Missing codes are easily seen because a missing code
means zero counts for a particular code. The absence of large
spikes in the plot indicates small differential nonlinearity.
Figure 16 shows a histogram plot for the ADC indicating very
small differential nonlinearity and no missing codes for an input
frequency of 204 kHz. For a sine-wave input, a perfect ADC
would produce a cusp probability density function described by
the equation
p(V )
=
1
π( A2 V 2)1/2
where A is the peak amplitude of the sine wave and p(V) the
probability of occurrence at a voltage V.
The histogram plot of Figure 16 corresponds very well with this
cusp shape.
Further typical plots of the performance of the AD7569/AD7669
are shown in the Typical Performance Graphs section of the data
sheet.
Figure 16. ADC Histogram Plot
and harmonic distortion performance. Similarly, for inter-
modulation distortion, an input (either to VIN or DAC code)
consisting of pure sine waves at two frequencies is applied to the
AD7569/AD7669.
Figure 13. ADC FFT Plot
Figure 13 shows a 2048 point FFT plot of the ADC with an in-
put signal of 130 kHz. The SNR is 48.4 dB. It can be seen that
most of the harmonics are buried in the noise floor. It should be
noted that the harmonics are taken into account when calculat-
ing the SNR. The relationship between SNR and resolution (N)
is expressed by the following equation:
SNR = (6.02N + 1.76) dB
This is for an ideal part with no differential or integral linearity
errors. These errors will cause a degradation in SNR. By work-
ing backward from the above equation, it is possible to get a
measure of ADC performance expressed in effective number of
bits (N). This effective number of bits is plotted versus fre-
quency in Figure 14. The effective number of bits typically falls
between 7.7 and 7.8, corresponding to SNR figures of 48.1 dB
and 48.7 dB.
Figure 15 shows a spectrum analyzer plot of the output spec-
trum from the DAC with an ideal sine-wave table loaded to the
data inputs of the DAC. In this case, the SNR is 46 dB.
Figure 14. Effective Number of Bits vs. Frequency
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD7569BR | 功能描述:IC I/O PORT 8BIT ANLG 24-SOIC RoHS:否 类别:集成电路 (IC) >> 接口 - 专用 系列:LC²MOS 标准包装:3,000 系列:- 应用:PDA，便携式音频/视频，智能电话 接口:I²C，2 线串口 电源电压:1.65 V ~ 3.6 V 封装/外壳:24-WQFN 裸露焊盘 供应商设备封装:24-QFN 裸露焊盘（4x4） 包装:带卷 (TR) 安装类型:表面贴装 产品目录页面:1015 (CN2011-ZH PDF) 其它名称:296-25223-2 |
| AD7569BR-REEL | 功能描述:Analog I/O Interface 24-SOIC 制造商:analog devices inc. 系列:LC2MOS 包装:带卷（TR） 零件状态:上次购买时间 应用:模拟 I/O 接口:总线 电压 - 电源:4.75 V ~ 5.25 V 封装/外壳:24-SOIC（0.295"，7.50mm 宽） 供应商器件封装:24-SOIC 安装类型:表面贴装 标准包装:1 |
| AD7569BRZ | 功能描述:IC I/O PORT 8BIT ANALOG 24SOIC RoHS:是 类别:集成电路 (IC) >> 接口 - 专用 系列:LC²MOS 特色产品:NXP - I2C Interface 标准包装:1 系列:- 应用:2 通道 I²C 多路复用器 接口:I²C，SM 总线 电源电压:2.3 V ~ 5.5 V 封装/外壳:16-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:16-TSSOP 包装:剪切带 (CT) 安装类型:表面贴装 产品目录页面:825 (CN2011-ZH PDF) 其它名称:568-1854-1 |
| AD7569JN | 功能描述:IC I/O PORT 8BIT ANLG 24-DIP RoHS:否 类别:集成电路 (IC) >> 接口 - 专用 系列:LC²MOS 标准包装:3,000 系列:- 应用:PDA，便携式音频/视频，智能电话 接口:I²C，2 线串口 电源电压:1.65 V ~ 3.6 V 封装/外壳:24-WQFN 裸露焊盘 供应商设备封装:24-QFN 裸露焊盘（4x4） 包装:带卷 (TR) 安装类型:表面贴装 产品目录页面:1015 (CN2011-ZH PDF) 其它名称:296-25223-2 |
| AD7569JNZ | 功能描述:IC I/O PORT 8BIT ANALOG 24DIP RoHS:是 类别:集成电路 (IC) >> 接口 - 专用 系列:LC²MOS 特色产品:NXP - I2C Interface 标准包装:1 系列:- 应用:2 通道 I²C 多路复用器 接口:I²C，SM 总线 电源电压:2.3 V ~ 5.5 V 封装/外壳:16-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:16-TSSOP 包装:剪切带 (CT) 安装类型:表面贴装 产品目录页面:825 (CN2011-ZH PDF) 其它名称:568-1854-1 |
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