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參數資料
型號: AD7708BR
廠商: ANALOG DEVICES INC
元件分類: ADC
英文描述: Shaft; Style: 2 - light; Applicable Model: LE-P / LEL-W
中文描述: 10-CH 16-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDSO28
封裝: PLASTIC, SOIC-28
文件頁數: 43/44頁
文件大小: 339K
代理商: AD7708BR
REV. 0
AD7708/AD7718
–43–
Table XXI. Normal Mode 50 Hz and 60 Hz Rejection vs. Settling Time and Update Rate for a Selection of SF Words
CHOP Disabled
CHOP Enabled
50 Hz
Rejection
(dB)
1 Hz
60 Hz
Rejection
(dB)
1 Hz
50 Hz
Rejection
1 Hz
60 Hz
Rejection
(dB)
1 Hz
SF
Word
f
ADC
(Hz)
1365.33
315.08
59.36
54.6
49.95
27.13
16.06
t
SETTLE
(ms)
2.20
9.52
50.54
54.93
60
110.6
186.76
f
ADC
(Hz)
N/A
105.03
19.79
18.2
16.65
9.04
5.35
t
SETTLE
(ms) (dB)
N/A
19.04
101
110
180
221
373.5
03
13
69
75
82
151
255
0.05
1
42
57
100
60
77
0.08
1.5
94
60
N/A
21
60
62
100
72
93
N/A
13.6
94
66
53
63
68
60
68
Optimizing Throughput while Maximizing 50 Hz and 60 Hz
Rejection in a Multiplexed Data Acquisition System
The AD7708/AD7718 can be optimized for one of two modes
of operation. Operating the AD7708/AD7718 with chopping
enabled (
CHOP
= 0) optimizes the AD7708/AD7718 for analog
performance over channel throughput. Output data rates vary
from 5.35 Hz (186.77 ms) to 105.03 Hz (9.52 ms). Optimum
performance, in terms of minimizing offset error and offset and
gain drift performance, is achieved as a result of chopping the
signal chain.
With chopping disabled the available output rates vary from
16.06 Hz (62.26 ms) to 1365.33 Hz (0.73 ms). The range of
applicable SF words is from 3 to 255. When the chopping is
disabled the channel output data rate is increased by a factor of
3 compared to the situation when chopping is enabled is
disabled. When used in multiplexed applications, operation
with chop disabled will offer the best throughput time when
cycling through all channels. The drawback with chopping
disabled is that the drift performance is degraded and calibra-
tion is required following gain and temperature changes. One
of the key requirements in these applications is to optimize the SF
word to obtain the maximum filter rejection at 50 Hz and 60 Hz
while minimizing the channel throughput rate. This is achieved
with an SF word of 75 giving 57 dB rejection at 50 Hz and
60 dB rejection at 60 Hz while offering a channel throughput
time of 55 ms.
Using a higher SF word of 151, 50 Hz and 60 Hz rejection can
be maximized at 60 dB with a channel throughput rate of 110 ms.
An SF word of 255 gives maximum rejection at both 50 Hz
and 60 Hz, but the channel throughput rate is restricted to
186 ms. Table XXI gives a quick comparison of normal mode 50 Hz
and 60 Hz rejection, settling time, and update rate for a selec-
tion of SF words with both chopping enabled and disabled.
相關PDF資料
PDF描述
AD7708BRU 8-/10-Channel, Low Voltage, Low Power, ADCs
AD7708 8-/10-Channel, Low Voltage, Low Power, ADCs
AD7718 8-/10-Channel, Low Voltage, Low Power, ADCs
AD7718BR 8-/10-Channel, Low Voltage, Low Power, ADCs
AD7718BRU 8-/10-Channel, Low Voltage, Low Power, ADCs
相關代理商/技術參數
參數描述
AD7708BR-REEL 功能描述:IC ADC 16BIT R-R 8/10CH 28-SOIC RoHS:否 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 標準包裝:1,000 系列:- 位數:16 采樣率(每秒):45k 數據接口:串行 轉換器數目:2 功率耗散(最大):315mW 電壓電源:模擬和數字 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:28-SOIC(0.295",7.50mm 寬) 供應商設備封裝:28-SOIC W 包裝:帶卷 (TR) 輸入數目和類型:2 個單端,單極
AD7708BR-REEL7 功能描述:IC ADC 16BIT R-R 8/10CH 28-SOIC RoHS:否 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 標準包裝:1,000 系列:- 位數:16 采樣率(每秒):45k 數據接口:串行 轉換器數目:2 功率耗散(最大):315mW 電壓電源:模擬和數字 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:28-SOIC(0.295",7.50mm 寬) 供應商設備封裝:28-SOIC W 包裝:帶卷 (TR) 輸入數目和類型:2 個單端,單極
AD7708BRU 功能描述:IC ADC 16BIT R-R 8/10CH 28-TSSOP RoHS:否 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 標準包裝:1,000 系列:- 位數:16 采樣率(每秒):45k 數據接口:串行 轉換器數目:2 功率耗散(最大):315mW 電壓電源:模擬和數字 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:28-SOIC(0.295",7.50mm 寬) 供應商設備封裝:28-SOIC W 包裝:帶卷 (TR) 輸入數目和類型:2 個單端,單極
AD7708BRU-REEL 功能描述:IC ADC 16BIT R-R 8/10CH 28-TSSOP RoHS:否 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 標準包裝:1,000 系列:- 位數:16 采樣率(每秒):45k 數據接口:串行 轉換器數目:2 功率耗散(最大):315mW 電壓電源:模擬和數字 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:28-SOIC(0.295",7.50mm 寬) 供應商設備封裝:28-SOIC W 包裝:帶卷 (TR) 輸入數目和類型:2 個單端,單極
AD7708BRU-REEL7 功能描述:IC ADC 16BIT R-R 8/10CH 28-TSSOP RoHS:否 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 標準包裝:1,000 系列:- 位數:16 采樣率(每秒):45k 數據接口:串行 轉換器數目:2 功率耗散(最大):315mW 電壓電源:模擬和數字 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:28-SOIC(0.295",7.50mm 寬) 供應商設備封裝:28-SOIC W 包裝:帶卷 (TR) 輸入數目和類型:2 個單端,單極
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