参数资料
| 型号： | AD7891YPZ-1REEL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 11/20页 |
| 文件大小： | 0K |
| 描述： | IC DAS 12BIT 8CH 44-PLCC |
| 产品变化通告： | Product Discontinuance 27/Oct/2011 |
| 标准包装： | 500 |
| 类型： | 数据采集系统（DAS） |
| 分辨率（位）： | 12 b |
| 采样率（每秒）： | 500k |
| 数据接口： | 串行，并联 |
| 电压电源： | 单电源 |
| 电源电压： | 5V |
| 工作温度： | -55°C ~ 105°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 44-LCC（J 形引线） |
| 供应商设备封装： | 44-PLCC（16.59x16.59） |
| 包装： | 带卷 (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
相关PDF资料 |
PDF描述 |
|---|---|
| MS27473E22F35PA | CONN PLUG 100POS STRAIGHT W/PINS |
| LTC1296DISW#TRPBF | IC DATA ACQ SYSTEM 12BIT 20-SOIC |
| LTC1289BCN#PBF | IC DATA ACQ SYS 12BIT 3V 20-DIP |
| MS27467T25F35PD | CONN PLUG 128POS STRAIGHT W/PINS |
| MS3456W18-10P | CONN PLUG 4POS STRAIGHT W/PINS |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
发布紧急采购，3分钟左右您将得到回复。