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参数资料
| 型号： | AD73311AR |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | 通信及网络 |
| 英文描述： | Low Cost, Low Power CMOS General Purpose Analog Front End |
| 中文描述： | SPECIALTY TELECOM CIRCUIT, PDSO20 |
| 封装： | SOIC-20 |
| 文件页数： | 21/36页 |
| 文件大小： | 382K |
| 代理商： | AD73311AR |
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REV. A
AD73311L
–21–
FREQUENCY
–
Hz
0
0.5
0
d
–
20
1.0
1.5
2.0
2.5
3.0
3.5
10
4
–
100
–
10
–
30
–
40
–
50
–
60
–
70
–
80
–
90
Figure 20. FFT (DAC 64 kHz Sampling)
As the AD73311L can be operated at 8 kHz (see Figure 21) or
16 kHz sampling rates, which make it particularly suited for
voiceband processing, it is important to understand the action of
the interpolator
’
s Sinc3 response. As was the case with the encoder
section, if the output signal
’
s frequency response is not bounded
by the Nyquist frequency it may be necessary to perform some
initial digital
fi
ltering to eliminate signal energy above Nyquist to
ensure that it is not imaged at the integer multiples of the sampling
frequency. If the user chooses to bypass the interpolator, per-
haps to reduce group delay, images of the original signal will be
generated at integer intervals of the sampling frequency. In this
case these images must be removed by external analog
fi
ltering.
FREQUENCY
–
Hz
0
500
0
–
10
d
–
20
–
30
–
40
–
50
–
60
1000
1500
2000
2500
3000
3500
4000
–
70
–
80
–
90
–
100
Figure 21. FFT (DAC 8 kHz Sampling)
Figure 22 shows the output spectrum of a 1 kHz tone being
generated at an 8 kHz sampling rate with the interpolator
bypassed.
FREQUENCY
–
Hz
0
0.5
0
d
–
20
1.0
1.5
2.0
2.5
3.0
3.5
10
4
–
100
–
10
–
30
–
40
–
50
–
60
–
70
–
80
–
90
Figure 22. FFT (DAC 8 kHz Sampling—Interpolator
Bypassed)
Decoder Group Delay
The interpolator roll-off is mainly due to its sinc-cubed function
characteristic, which has an inherent group delay given by the
equation:
Group Delay
(
Interpolator
) =
Order
×
(
L
–
1)/2)
×
T
INT
where:
Order
is the interpolator order (= 3),
L
is the interpolation factor (= 32 @ 64 kHz, = 64 @ 32 kHz,
= 128 @ 16 kHz, = 256 @ 8 kHz) and
T
INT
is the interpolation sample interval (= 1/2.048e6)
=> Group Delay (Interpolator @ 64 kHz)
= 3
×
(32
–
1)/2
×
(1/2.048e6)
= 22.7
μ
s
The analog section has a group delay of approximately 25
μ
s.
On-Chip Filtering
The primary function of the system
fi
ltering
’
s sinc-cubed (Sinc3)
response is to eliminate aliases or images of the ADCs or DAC
’
s
resampling, respectively. Both modulators are sampled at a
nominal rate of DMCLK/8 (which is 2.048 MHz for a DMCLK
of 16.384 MHz) and the simple, external RC antialias
fi
lter is
suf
fi
cient to provide the required stopband rejection above the
Nyquist frequency for this sample rate. In the case of the ADC
section, the decimating
fi
lter is required to both decrease sample
rate and increase sample resolution. The process of changing
sample rate (resampling) leads to aliases of the original sampled
waveform appearing at integer multiples of the new sample rate.
These aliases would get mapped into the required signal pass-
band without the application of some further antialias
fi
ltering.
In the AD73311L, the sinc-cubed response of the decimating
fi
lter creates spectral nulls at integer multiples of the new sample
rate. These nulls coincide with the aliases of the original waveform
which were created by the down-sampling process, therefore
reducing or eliminating the aliasing due to sample rate reduction.
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PDF描述 |
|---|---|
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| AD73311LAR | Low Cost, Low Power CMOS General Purpose Analog Front End |
| AD73311L | Low Cost, Low Power CMOS General Purpose Analog Front End Processor(低成本，低功耗的CMOS通用双模拟前端处理器) |
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| AD73322LARU | Low Cost, Low Power CMOS General-Purpose Dual Analog Front End |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AD73311AR-REEL | 制造商:Analog Devices 功能描述:Audio Codec 1ADC / 1DAC 16-Bit 20-Pin SOIC W T/R |
| AD73311ARS | 制造商:Analog Devices 功能描述:Audio Codec 1ADC / 1DAC 16-Bit 20-Pin SSOP |
| AD73311ARS-REEL | 制造商:Analog Devices 功能描述:Audio Codec 1ADC / 1DAC 16-Bit 20-Pin SSOP T/R 制造商:Rochester Electronics LLC 功能描述:SPEECH & TELEPHONY CODEC I.C. - Tape and Reel |
| AD73311ARSZ | 功能描述:IC ANALOG FRONT END 20-SSOP 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) |
| AD73311ARSZ-REEL | 功能描述:IC ANALOG FRONT END 20-SSOP 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) |
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