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參數資料
型號: AD7890AN-2
廠商: ANALOG DEVICES INC
元件分類: ADC
英文描述: Explosion-Proof Limit Switches Series CX: Standard Housing: Side Rotary, Lever not included
中文描述: 8-CH 12-BIT PROPRIETARY METHOD ADC, SERIAL ACCESS, PDIP24
封裝: 0.300 INCH, PLASTIC, MS-001, DIP-24
文件頁數: 19/20頁
文件大小: 302K
代理商: AD7890AN-2
AD7890
–19–
REV. A
E ffective Number of Bits
T he formula for Signal to (Noise + Distortion) Ratio (See T er-
minology section) is related to the resolution or number of bits
in the converter. Rewriting the formula, below, gives a measure
of performance expressed in effective number of bits (N):
N = (SNR —
1.76)/6.02
where
SNR
is Signal to (Noise + Distortion) Ratio
T he effective number of bits for a device can be calculated
from its measured Signal to (Noise + Distortion) Ratio. Fig-
ure 21 shows a typical plot of effective number of bits versus
frequency for the AD7890-2 from dc to 40 kHz. T he sampling
frequency is 102.4 kHz. T he plot shows that the AD7890 con-
verts an input sine wave of 40 kHz to an effective numbers of
bits of 11 which equates to a Signal to (Noise + Distortion)
level of 68 dB.
12
10
0
40
11.5
10.5
11
20
E
INPUT FREQUENCY – kHz
Figure 21. Effective Number of Bits vs. Frequency
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相關代理商/技術參數
參數描述
AD7890AN-4 制造商:Analog Devices 功能描述:ADC Single SAR 117ksps 12-bit Serial 24-Pin PDIP 制造商:Rochester Electronics LLC 功能描述:8 CHANNEL,SERIAL A/D IC - Bulk
AD7890ANZ-10 功能描述:IC DAS 12BIT 8CH 24-DIP RoHS:是 類別:集成電路 (IC) >> 數據采集 - ADCs/DAC - 專用型 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:50 系列:- 類型:數據采集系統(DAS) 分辨率(位):16 b 采樣率(每秒):21.94k 數據接口:MICROWIRE?,QSPI?,串行,SPI? 電壓電源:模擬和數字 電源電壓:1.8 V ~ 3.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤 供應商設備封裝:40-TQFN-EP(6x6) 包裝:托盤
AD7890ANZ-10 制造商:Analog Devices 功能描述:A/D Converter (A-D) IC
AD7890ANZ-2 功能描述:IC DAS 12BIT 8CH 24-DIP RoHS:是 類別:集成電路 (IC) >> 數據采集 - ADCs/DAC - 專用型 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:50 系列:- 類型:數據采集系統(DAS) 分辨率(位):16 b 采樣率(每秒):21.94k 數據接口:MICROWIRE?,QSPI?,串行,SPI? 電壓電源:模擬和數字 電源電壓:1.8 V ~ 3.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤 供應商設備封裝:40-TQFN-EP(6x6) 包裝:托盤
AD7890ANZ-4 功能描述:IC DAS 12BIT 8CH 24-DIP RoHS:是 類別:集成電路 (IC) >> 數據采集 - ADCs/DAC - 專用型 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:50 系列:- 類型:數據采集系統(DAS) 分辨率(位):16 b 采樣率(每秒):21.94k 數據接口:MICROWIRE?,QSPI?,串行,SPI? 電壓電源:模擬和數字 電源電壓:1.8 V ~ 3.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤 供應商設備封裝:40-TQFN-EP(6x6) 包裝:托盤
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