參數(shù)資料
型號(hào): EVAL-AD7723CBZ
廠商: Analog Devices Inc
文件頁數(shù): 11/32頁
文件大小: 0K
描述: BOARD EVALUATION FOR AD7723
標(biāo)準(zhǔn)包裝: 1
ADC 的數(shù)量: 1
位數(shù): 16
采樣率(每秒): 1.2M
數(shù)據(jù)接口: 串行,并聯(lián)
輸入范圍: ±VREF
在以下條件下的電源(標(biāo)準(zhǔn)): 475mW @ 1.2MSPS
工作溫度: -40°C ~ 85°C
已用 IC / 零件: AD7723
已供物品: 板,CD
相關(guān)產(chǎn)品: AD7723BSZ-REEL-ND - IC ADC 16BIT SIGMA-DELTA 44MQFP
AD7723BSZ-ND - IC ADC 16BIT SIGMA-DELTA 44MQFP
AD7723
Rev. C | Page 19 of 32
Figure 32 shows the frequency response of the digital filter in
both low-pass and band-pass modes. Due to the sampling
nature of the converter, the pass-band response is repeated
about the input sampling frequency, fCLKIN, and at integer
multiples of fCLKIN. Out-of-band noise or signals coincident with
any of the filter images are aliased down to the pass band.
However, due to the AD7723’s high oversampling ratio, these
bands occupy only a small fraction of the spectrum, and most
broadband noise is attenuated by at least 90 dB. In addition, as
shown in Figure 33, with even a low-order filter, there is
significant attenuation at the first image frequency. This
contrasts with a normal Nyquist rate converter where a very
high-order antialias filter is required to allow most of the
bandwidth to be used while ensuring sufficient attenuation at
multiples of fCLKIN.
fCLKIN
0
1.0
0.5
0dB
–100dB
01186-029
Figure 29. Low-Pass Filter Decimate by 16
0
1.0
0.5
0dB
–100dB
01186-030
fCLKIN
Figure 30. Low-Pass Filter Decimate by 32
0
1.0
0.5
0dB
–100dB
01186-031
fCLKIN
Figure 31. Band-Pass Filter Decimate by 32
1
fCLKIN
2
fCLKIN
3
fCLKIN
0dB
01186-032
Figure 32. Digital Filter Frequency Response
fCLKIN/32
0dB
fCLKIN
REQUIRED
ATTENUATION
ANTIALIAS FILTER
RESPONSE
OUTPUT
DATA RATE
01186-033
Figure 33. Frequency Response of Antialias Filter
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