参数资料
| 型号： | AD73322LYRZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 24/48页 |
| 文件大小： | 0K |
| 描述： | IC ANALOG FRONT END DUAL 28-SOIC |
| 标准包装： | 27 |
| 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-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 28-SOIC W |
| 包装： | 管件 |
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页第16页第17页第18页第19页第20页第21页第22页第23页当前第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页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页第47页第48页
AD73322L
Rev. A | Page 30 of 48
In the case of voice-band processing where 4 kHz represents the
Nyquist frequency, if the signal to be measured were externally
band-limited, then an 8 kHz sampling rate would suffice.
However, if the bandwidth must be limited with a digital filter,
then it may be more appropriate to use an initial sampling rate
of 16 kHz and to process this sample stream with a filtering and
decimating algorithm to achieve a 4 kHz band-limited signal at
an 8 kHz rate. Figure 19 details the initial 16 kHz sampled tone.
00691-028
FREQUENCY (Hz)
8000
0
1000
2000
3000
4000
5000
6000
7000
dB
0
–40
–20
–60
–80
–100
–120
–140
Figure 28. FFT (ADC 16 kHz Direct Sampling)
Figure 29 shows the spectrum of the final 8 kHz sampled
filtered tone.
00691-029
FREQUENCY (Hz)
4000
2500
3000
3500
0
500
1000
1500
2000
dB
0
–20
–40
–60
–80
–100
–120
–140
Figure 29. FFT (ADC 8 kHz Filtered and Decimated from 16 kHz)
ENCODER GROUP DELAY
When programmed for high sampling rates, the AD73322L
offers a very low level of group delay, which is given by
Group Delay (Decimator) = Order × ((M 1)/2) × TDEC
where:
Order is the order of the decimator (= 3)
M is the decimation factor (= 32 @ 64 kHz, = 64 @ 32 kHz,
= 128 @ 16 kHz , = 256 @ 8 kHz)
TDEC is the decimation sample interval (= 1/2.048e6 based on
DMCLK = 16.384 MHz)
Consider a second example:
Group Delay (decimator @ 64 kHz) = 3 × (32 1)/2 ×
(1/2.048e6) = 22.7 s
If final filtering is implemented in the DSP, the final filter’s
group delay must be taken into account when calculating
overall group delay.
DECODER SECTION
The decoder section updates (samples) at the same rate as the
encoder section. This rate is programmable as 64 kHz, 32 kHz,
16 kHz, or 8 kHz (from a 16.384 MHz MCLK). The decoder
section represents a reverse of the process that was described in
the encoder section. In the case of the decoder section, signals
are applied in the form of samples at an initial low rate. This
sample rate is then increased to the final digital sigma-delta
modulator rate of DMCLK/8 by interpolating new samples
between the original samples. The interpolating filter also has
the action of canceling images due to the interpolation process
using spectral nulls that exist at integer multiples of the initial
sampling rate. Figure 30 shows the spectral response of the
decoder section sampling at 64 kHz. Again, its sigma-delta
modulator shapes the noise so it is reduced in the voice
bandwidth dc–4 kHz. For improved voice-band SNR, the user
can implement an initial anti-imaging filter, preceded by 8 kHz
to 64 kHz interpolation, in the DSP.
00691-030
FREQUENCY (Hz)
×104
3.5
0
0.5
1.0
1.5
2.0
2.5
3.0
dB
0
–20
–10
–40
–30
–60
–50
–80
–70
–90
–100
Figure 30. FFT (DAC 64 kHz Sampling)
相关PDF资料 |
PDF描述 |
|---|---|
| AD73360ARZ | IC PROCESSOR FRONTEND 6CH 28SOIC |
| AD7352YRUZ-500RL7 | IC ADC DUAL 12BIT 3MSPS 16TSSOP |
| AD7356YRUZ-500RL7 | IC ADC DUAL 12BIT 5MSPS 16TSSOP |
| AD7357YRUZ | IC ADC DUAL14BIT 4.2MSPS 16TSSOP |
| AD7367BRUZ-500RL7 | IC ADC 14BIT SAR 1MSPS 24TSSOP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AD73322LYST | 制造商:Analog Devices 功能描述: |
| AD73322LYSTZ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Analog Devices 功能描述: |
| AD73360 | 制造商:AD 制造商全称:Analog Devices 功能描述:Six-Input Channel Analog Front End |
| AD73360AR | 制造商:Analog Devices 功能描述:AFE General Purpose 6ADC 16-Bit 5V 28-Pin SOIC W 制造商:Analog Devices 功能描述:IC 16-BIT ADC |
| AD73360AR-REEL | 制造商:Analog Devices 功能描述:AFE General Purpose 6ADC 16-Bit 5V 28-Pin SOIC W T/R 制造商:Analog Devices 功能描述:AFE GEN PURPOSE 6ADC 16BIT 5V/5V/5V 28SOIC W - Tape and Reel |
发布紧急采购，3分钟左右您将得到回复。