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參數資料
| 型號： | AD7891BS-2 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | ADC |
| 英文描述： | LC2MOS 8-Channel, 12-Bit High Speed Data Acquisition System |
| 中文描述： | 8-CH 12-BIT PROPRIETARY METHOD ADC, SERIAL/PARALLEL ACCESS, PQFP44 |
| 封裝： | PLASTIC, MO-112-AA-1, MQFP-44 |
| 文件頁數： | 19/20頁 |
| 文件大小： | 173K |
| 代理商： | AD7891BS-2 |
AD7891
–19–
REV. A
Effective Number of Bits
The formula for signal to (noise + distortion) Ratio (see termi-
nology) is related to the resolution, or number of bits, of the
converter. Rewriting the formula, below, gives a measure of
performance expressed in effective number of bits (ENOB):
ENOB = (SNR - 1.76)/6.02
where
SNR
is the signal to (noise + distortion) ratio.
The effective number of bits for a device can be calculated from
its measured SNR. Figure 20 shows a typical plot of effective
number of bits versus frequency for the AD7891-1 and the
AD7891-2 from dc to 200 kHz. The sampling frequency is
500 kHz. The AD7891-1 inputs were configured for
±
10 V
operation. The AD7891-2 inputs were configured for 0 to +5V
operation. The AD7891-1 plot only goes to 100kHz as a
±
10 V sine wave of sufficient quality was unavailable at higher
frequencies.
Figure 20 shows that the AD7891-1 converts an input sine wave
of 100 kHz to an effective number of bits of of 11 which equates
to a signal-to-(noise + distortion) level of 68.02 dBs. The
AD7891-2 converts an input sine wave of 200 kHz to an effec-
tive number of bits of 11.07 which equates to a signal-to-(noise
+ distortion) level of 68.4 dBs.
FREQUENCY – kHz
12.0
11.9
11.1
40
80
120
11.5
11.4
11.3
11.2
11.7
11.6
11.8
20
0
60
100
140
160
180
200
11.0
E
AD7891-2 ENOB
AD7891-1 ENOB
Figure 20. Effective Number of Bits vs. Frequency
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| AD7891 | 14-Bit 50 kSPS ADC Ser. Out, 1.8V Operation 8-MSOP |
| AD7891AP-2 | LC2MOS 8-Channel, 12-Bit High Speed Data Acquisition System |
| AD7891AS-2 | LC2MOS 8-Channel, 12-Bit High Speed Data Acquisition System |
| AD7892AR-2 | LC2MOS Single Supply, 12-Bit 600 kSPS ADC |
| AD7892SQ-1 | LC2MOS Single Supply, 12-Bit 600 kSPS ADC |
相關代理商/技術參數 |
參數描述 |
|---|---|
| AD7891BSZ-1 | 功能描述:IC DAS 12BIT 8CH 44-MQFP 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 |
| AD7891BSZ-2 | 功能描述:IC DAS 12BIT 8CH 44-MQFP 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 |
| AD7891YP-1 | 制造商:Analog Devices 功能描述:ADC Single 454.5ksps 12-bit Parallel/Serial 44-Pin PLCC 制造商:Rochester Electronics LLC 功能描述:8 CHANNEL, 12-BIT ADC I.C. - Bulk |
| AD7891YP-1REEL | 制造商:Analog Devices 功能描述:ADC Single 454.5ksps 12-bit Parallel/Serial 44-Pin PLCC T/R 制造商:Analog Devices 功能描述:ADC SGL 454.5KSPS 12-BIT PARALLEL/SERL 44PLCC - Tape and Reel |
| AD7891YPZ-1 | 功能描述:IC DAS 12BIT 8CH 44-PLCC 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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