參數資料
| 型號： | AD7891YPZ-1REEL |
| 廠商： | Analog Devices Inc |
| 文件頁數： | 11/20頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC DAS 12BIT 8CH 44-PLCC |
| 產品變化通告： | Product Discontinuance 27/Oct/2011 |
| 標準包裝： | 500 |
| 類型： | 數據采集系統(tǒng)（DAS） |
| 分辨率（位）： | 12 b |
| 采樣率（每秒）： | 500k |
| 數據接口： | 串行，并聯(lián) |
| 電壓電源： | 單電源 |
| 電源電壓： | 5V |
| 工作溫度： | -55°C ~ 105°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 44-LCC（J 形引線） |
| 供應商設備封裝： | 44-PLCC（16.59x16.59） |
| 包裝： | 帶卷 (TR) |
AD7891
–19–
REV. D
Effective Number of Bits
The formula for signal-to-(noise + distortion) ratio (see Terminology
section) is related to the resolution or number of bits of the
converter. Rewriting the formula gives a measure of performance
expressed in effective number of bits (ENOB).
ENOB
SNR
=-
()
176
602
./ .
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 5 V
operation. The AD7891-1 plot only goes to 100 kHz 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 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 effective 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
060
100
140
160
180
200
11.0
EFFECTIVE
NUMBER
OF
BITS
AD7891-2 ENOB
AD7891-1 ENOB
Figure 20. Effective Number of Bits vs. Frequency
44-Lead Plastic Leaded Chip Carrier [PLCC]
(P-44A)
Dimensions shown in inches and (millimeters)
BOTTOM VIEW
(PINS UP)
6
PIN 1
IDENTIFIER
7
40
39
17
18
29
28
TOP VIEW
(PINS DOWN)
0.656 (16.66)
0.650 (16.51)
SQ
0.048 (1.22)
0.042 (1.07)
0.050
(1.27)
BSC
0.695 (17.65)
0.685 (17.40)
SQ
0.048 (1.22)
0.042 (1.07)
0.021 (0.53)
0.013 (0.33)
0.630 (16.00)
0.590 (14.99)
0.032 (0.81)
0.026 (0.66)
0.180 (4.57)
0.165 (4.19)
0.056 (1.42)
0.042 (1.07)
0.020 (0.51)
MIN
0.120 (3.05)
0.090 (2.29)
0.040 (1.01)
0.025 (0.64)
R
COMPLIANT TO JEDEC STANDARDS MO-047AC
CONTROLLING DIMENSIONS ARE IN INCHES; MILLIMETER DIMENSIONS
(IN PARENTHESES) ARE ROUNDED-OFF INCH EQUIVALENTS FOR
REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN
OUTLINE DIMENSIONS
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相關代理商/技術參數 |
參數描述 |
|---|---|
| AD7891YS1 | 制造商:AD 功能描述:New |
| AD7891YS-1 | 制造商:Analog Devices 功能描述:ADC Single 454.5ksps 12-bit Parallel/Serial 44-Pin MQFP |
| AD7891YS-1REEL | 制造商:Analog Devices 功能描述:ADC Single 454.5ksps 12-bit Parallel/Serial 44-Pin MQFP T/R 制造商:Analog Devices 功能描述:ADC SGL 454.5KSPS 12-BIT PARALLEL/SERL 44MQFP - Tape and Reel |
| AD7891YS-2 | 制造商:Analog Devices 功能描述:ADC Single 500ksps 12-bit Parallel/Serial 44-Pin MQFP 制造商:Rochester Electronics LLC 功能描述:8 CHANNEL, 12-BIT ADC I.C. - Bulk |
| AD7891YS-2REEL | 制造商:Analog Devices 功能描述:ADC Single 500ksps 12-bit Parallel/Serial 44-Pin MQFP T/R |
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