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参数资料
| 型号： | AD73322LARUZ-REEL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 7/43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
–15–
REV. B
ADC
Both ADCs consist of an analog sigma-delta modulator and a
digital antialiasing decimation filter. The sigma-delta modu-
lator noise-shapes the signal and produces 1-bit samples at a
DMCLK/8 rate. This bitstream, representing the analog input
signal, is input to the antialiasing decimation filter. The decimation
filter reduces the sample rate and increases the resolution.
Analog Sigma-Delta Modulator
The AD73322’s input channels employ a sigma-delta conver-
sion technique, which provides a high resolution 16-bit output
with system filtering being implemented on-chip.
Sigma-delta converters employ a technique known as over-
sampling, where the sampling rate is many times the highest
frequency of interest. In the case of the AD73322, the initial
sampling rate of the sigma-delta modulator is DMCLK/8. The
main effect of oversampling is that the quantization noise is
spread over a very wide bandwidth, up to FS/2 = DMCLK/16
(Figure 10a). This means that the noise in the band of interest is
much reduced. Another complementary feature of sigma-delta
converters is the use of a technique called noise-shaping. This
technique has the effect of pushing the noise from the band of
interest to an out-of-band position (Figure 10b). The combi-
nation of these techniques, followed by the application of a
digital filter, sufficiently reduces the noise in band to ensure
good dynamic performance from the part (Figure 10c).
BAND
OF
INTEREST
FS/2
DMCLK/16
FS/2
DMCLK/16
FS/2
DMCLK/16
DIGITAL FILTER
NOISE SHAPING
BAND
OF
INTEREST
BAND
OF
INTEREST
a.
b.
c.
Figure 10. Sigma-Delta Noise Reduction
Figure 11 shows the various stages of filtering that are employed
in a typical AD73322 application. In Figure 11a we see the
transfer function of the external analog antialias filter. Even
though it is a single RC pole, its cutoff frequency is sufficiently
far away from the initial sampling frequency (DMCLK/8) that it
takes care of any signals that could be aliased by the sampling
frequency. This also shows the major difference between the
initial oversampling rate and the bandwidth of interest. In Fig-
ure 11b, the signal and noise-shaping responses of the sigma-
delta modulator are shown. The signal response provides further
rejection of any high frequency signals while the noise-shaping
will push the inherent quantization noise to an out-of-band
position. The detail of Figure 11c shows the response of the
digital decimation filter (Sinc-cubed response) with nulls every
multiple of DMCLK/256, which corresponds to the decimation
filter update rate for a 64 kHz sampling. The nulls of the Sinc3
response correspond with multiples of the chosen sampling
frequency. The final detail in Figure 11d shows the application
of a final antialias filter in the DSP engine. This has the advan-
tage of being implemented according to the user’s requirements
and available MIPS. The filtering in Figures 11a through 11c is
implemented in the AD73322.
FB = 4kHz
FSINIT = DMCLK/8
a. Analog Antialias Filter Transfer Function
FB = 4kHz
FSINIT = DMCLK/8
NOISE TRANSFER FUNCTION
SIGNAL TRANSFER FUNCTION
b. Analog Sigma-Delta Modulator Transfer Function
FB = 4kHz
FSINTER = DMCLK/256
c. Digital Decimator Transfer Function
FB = 4kHz
FSINTER = DMCLK/256
FSFINAL = 8kHz
d. Final Filter LPF (HPF) Transfer Function
Figure 11. ADC Frequency Responses
相关PDF资料 |
PDF描述 |
|---|---|
| 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 |
| AD7357YRUZ | IC ADC DUAL14BIT 4.2MSPS 16TSSOP |
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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