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| 型号： | AD73322LARUZ-REEL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 20/43页 |
| 文件大小： | 0K |
| 描述： | IC PROCESSOR FRONTEND DL 28TSSOP |
| 标准包装： | 2,500 |
| 位数： | 16 |
| 通道数： | 4 |
| 功率（瓦特）： | 73mW |
| 电压 - 电源，模拟： | 2.7 V ~ 5.5 V |
| 电压 - 电源，数字： | 2.7 V ~ 5.5 V |
| 封装/外壳： | 28-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 28-TSSOP |
| 包装： | 带卷 (TR) |
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AD73322
–27–
REV. B
Table XXII. Device Count Settings
DC2
DC1
DC0
Cascade Length
00
0
1
00
1
2
01
0
3
01
1
4
10
0
5
10
1
6
11
0
7
11
1
8
PERFORMANCE
As the AD73322 is designed to provide high performance, low
cost conversion, it is important to understand the means by
which this high performance can be achieved in a typical appli-
cation. This section will, by means of spectral graphs, outline
the typical performance of the device and highlight some of the
options available to users in achieving their desired sample rate,
either directly in the device or by doing some post-processing in
the DSP, while also showing the advantages and disadvantages
of the different approaches.
Encoder Section
The AD73322 offers a variable sampling rate from a fixed
MCLK frequency—with 64 kHz, 32 kHz, 16 kHz and 8 kHz
being available with a 16.384 MHz external clock. Each of these
sampling rates preserves the same sampling rate in the ADC’s
sigma-delta modulator, which ensures that the noise perfor-
mance is optimized in each case. The examples below will show
the performance of a 1 kHz sine wave when converted at the
various sample rates.
The range of sampling rates is aimed to offer the user a degree
of flexibility in deciding how their analog front end is to be
implemented. The high sample rates of 64 kHz and 32 kHz are
suited to those applications, such as active control, where low
conversion group delay is essential. On the other hand, the
lower sample rates of 16 kHz and 8 kHz are better suited for
applications such as telephony, where the lower sample rates
result in lower DSP overhead.
Figure 20 shows the spectrum of the 1 kHz test tone sampled at
64 kHz. The plot shows the characteristic shaped noise floor of
a sigma-delta converter, which is initially flat in the band of
interest but then rises with increasing frequency. If a suitable
digital filter is applied to this spectrum, it is possible to eliminate
the noise floor in the higher frequencies. This signal can then be
used in DSP algorithms or can be further processed in a deci-
mation algorithm to reduce the effective sample rate. Figure 21
shows the resulting spectrum following the filtering and decima-
tion of the spectrum of Figure 20 from 64 kHz to an 8 kHz rate.
FREQUENCY – Hz
0
0.5
0
dB
–20
1.0
1.5
2.0
2.5
3.0
3.5
–100
–140
–120
–40
–60
–80
104
Figure 20. FFT (ADC 64 kHz Sampling)
FREQUENCY – Hz
0
500
0
–20
dB
–40
–60
–80
–100
–120
1000
1500
2000
2500
3000
3500
4000
Figure 21. FFT (ADC 8 kHz Filtered and Decimated from
64 kHz)
The AD73322 also features direct sampling at the lower rate of
8 kHz. This is achieved by the use of extended decimation regis-
ters within the decimator block, which allows for the increased
word growth associated with the higher effective oversampling
ratio. Figure 22 details the spectrum of a 1 kHz test tone con-
verted at an 8 kHz rate.
FREQUENCY – Hz
0
500
0
dB
50
100
1000
1500
2000
2500
3000
3500
4000
150
Figure 22. FFT (ADC 8 kHz Direct Sampling)
相关PDF资料 |
PDF描述 |
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| AD73322LYRZ | IC ANALOG FRONT END DUAL 28-SOIC |
| AD73360ARZ | IC PROCESSOR FRONTEND 6CH 28SOIC |
| AD7352YRUZ-500RL7 | IC ADC DUAL 12BIT 3MSPS 16TSSOP |
| AD7356YRUZ-500RL7 | IC ADC DUAL 12BIT 5MSPS 16TSSOP |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD73322LARZ | 功能描述:IC ANALOG FRONT END DUAL 28-SOIC RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模拟前端 (AFE) 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 位数:- 通道数:2 功率（瓦特）:- 电压 - 电源，模拟:3 V ~ 3.6 V 电压 - 电源，数字:3 V ~ 3.6 V 封装/外壳:32-VFQFN 裸露焊盘 供应商设备封装:32-QFN（5x5） 包装:带卷 (TR) |
| AD73322LARZ-REEL | 制造商:Analog Devices 功能描述:DUAL-CHANNEL, 3 V FRONT-END PROCESSOR FOR GENERAL PURPOSE - Tape and Reel |
| AD73322LAST | 制造商:Rochester Electronics LLC 功能描述:SPEECH AND TELEPHONY CODEC I.C. - Tape and Reel 制造商:Analog Devices 功能描述: |
| AD73322LAST-REEL | 制造商:Analog Devices 功能描述:Audio Codec 2ADC / 2DAC 16-Bit 44-Pin LQFP T/R 制造商:Rochester Electronics LLC 功能描述:SPEECH AND TELEPHONY CODEC I.C. - Tape and Reel |
| AD73322LASTZ | 制造商:Analog Devices 功能描述: 制造商:Rochester Electronics LLC 功能描述: |
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