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參數資料
| 型號： | AD7723BS |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | ADC |
| 英文描述： | 16-Bit, 1.2 MSPS CMOS, Sigma-Delta ADC |
| 中文描述： | 1-CH 16-BIT DELTA-SIGMA ADC, SERIAL/PARALLEL ACCESS, PQFP44 |
| 封裝： | MO-112-AA, MQFP-44 |
| 文件頁數： | 16/23頁 |
| 文件大小： | 435K |
| 代理商： | AD7723BS |
AD7723
–16–
REV. 0
effectively translates the wanted band to a maximum frequency
of a little less than f
CLKIN
/64 as shown in Figure 25d. Halving
the output data rate reduces the work load of any following
signal processor and also allows a lower serial clock rate to be
used.
BAND LIMITED SIGNAL
0dB
f
CLKIN
/16
0dB
ODR
LOW PASS FILTER RESPONSE
SAMPLE
IMAGE
f
CLKIN
/16
LOW PASS FILTER. OUTPUT DATA RATE = f
CLKIN
/16
0dB
f
CLKIN
/16
SAMPLE
IMAGE
BAND-PASS FILTER
RESPONSE
BAND-PASS FILTER.
(c)
f
CLKIN
/16
LOW PASS FILTER. OUTPUT DATA RATE = f
CLKIN
/32
ODR
SAMPLE
IMAGE
FREQUENCY
TRANSLATED
INPUT SIGNAL
0dB
(a)
(b)
(d)
Figure 25. Band-Pass Operation
The frequency response of the three digital filter operating modes
is shown in Figures 26a, 26b, and 26c.
f
CLKIN
0.0
1.0
0.5
0dB
–100dB
Figure 26a. Low-Pass Filter Decimate by 16
f
CLKIN
0.0
1.0
0.5
0dB
–100dB
Figure 26b. Low-Pass Filter Decimate by 32
f
CLKIN
0.0
1.0
0.5
0dB
–100dB
Figure 26c. Band-Pass Filter Decimate by 32
Figure 27a 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, f
CLKIN
and at integer mul-
tiples of f
CLKIN
. Out-of-band noise or signals coincident with
any of the filter images are aliased down to the passband. How-
ever, due to the AD7723’s high oversampling ratio, these bands
occupy only a small fraction of the spectrum, and most broad-
band noise is attenuated by at least 90 dB. In addition, as shown
in Figure 27b, 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 band width to be used
while ensuring sufficient attenuation at multiples of f
CLKIN
.
1f
CLKIN
2f
CLKIN
3f
CLKIN
0dB
Figure 27a. Digital Filter Frequency Response
f
CLKIN
/32
0dB
f
CLKIN
REQUIRED
ATTENUATION
ANTIALIAS FILTER
RESPONSE
OUTPUT
DATA RATE
Figure 27b. Frequency Response of Antialias Filter
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相關代理商/技術參數 |
參數描述 |
|---|---|
| AD7723BS-REEL | 制造商:Analog Devices 功能描述:Single ADC Delta-Sigma 19.2Msps 16-bit Parallel/Serial 44-Pin MQFP T/R |
| AD7723BSZ | 功能描述:IC ADC 16BIT SIGMA-DELTA 44MQFP RoHS:是 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 其它有關文件:TSA1204 View All Specifications 標準包裝:1 系列:- 位數:12 采樣率（每秒）:20M 數據接口:并聯 轉換器數目:2 功率耗散（最大）:155mW 電壓電源:模擬和數字 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-TQFP 供應商設備封裝:48-TQFP（7x7） 包裝:Digi-Reel® 輸入數目和類型:4 個單端，單極；2 個差分，單極 產品目錄頁面:1156 (CN2011-ZH PDF) 其它名稱:497-5435-6 |
| AD7723BSZ1 | 制造商:AD 制造商全稱:Analog Devices 功能描述:16-Bit, 1.2 MSPS CMOS, Sigma-Delta ADC |
| AD7723BSZ-REEL | 功能描述:IC ADC 16BIT SIGMA-DELTA 44MQFP RoHS:是 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 標準包裝:1 系列:- 位數:14 采樣率（每秒）:83k 數據接口:串行，并聯 轉換器數目:1 功率耗散（最大）:95mW 電壓電源:雙 ± 工作溫度:0°C ~ 70°C 安裝類型:通孔 封裝/外殼:28-DIP（0.600"，15.24mm） 供應商設備封裝:28-PDIP 包裝:管件 輸入數目和類型:1 個單端，雙極 |
| AD7723BSZ-REEL1 | 制造商:AD 制造商全稱:Analog Devices 功能描述:16-Bit, 1.2 MSPS CMOS, Sigma-Delta ADC |
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