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参数资料
| 型号： | AD8184ANZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 12/12页 |
| 文件大小： | 0K |
| 描述： | IC VIDEO MULTIPLEXER 4X1 14DIP |
| 标准包装： | 25 |
| 功能： | 视频多路复用器 |
| 电路： | 1 x 4:1 |
| 电压电源： | 双电源 |
| 电压 - 电源，单路/双路(±)： | ±4 V ~ 6 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 14-DIP（0.300"，7.62mm） |
| 供应商设备封装： | 14-PDIP |
| 包装： | 管件 |
| 产品目录页面： | 802 (CN2011-ZH PDF) |
AD8184
–9–
REV. 0
Color Document Scanner
Figure 23 shows a block diagram of a Color Document Scanner.
Charge Coupled Devices (CCDs) find widespread use in scan-
ner applications. A monochrome CCD delivers a serial stream
of voltages levels, each level being proportional to the light shin-
ing on that cell. In the case of the color image scanner shown,
there are three output streams, representing red, green and blue.
Interlaced with the stream of voltage levels is a voltage repre-
senting the reset level (or black level) of each cell. A Correlated
Double Sampler (CDS) subtracts these two voltages from each
other in order to eliminate the relatively large offsets common
with CCDs.
CONTROL & TIMING
CDS
0.1F
10F
VINB
VREF
SENSE
VINA
AD9220
10/12-BIT
10MSPS
A/D
CONVERTER
OUT
CDS
A1
A0
AD8184
R
G
ENABLE
B
CCD
REFERENCE
Figure 23. Color Document Scanner
The next step in the data acquisition process involves digitizing
the three signal streams. Assuming that the analog-to-digital
converter chosen has a fast enough sample rate, multiplexing
the three streams into a single ADC is generally more economi-
cal than using one ADC per channel. In the example shown, we
use the AD8184 as the multiplexer.
Because of its high bandwidth, the AD8184 is capable of driving
the switched capacitor input stage of the AD9220 without addi-
tional buffering. In addition to having the required bandwidth,
it is necessary to consider the settling time of the multiplexer. In
this case, the ADC has a sample rate of 10 MHz, which corre-
sponds to a sampling period of 100 ns. Typically, one phase of
the sampling clock is used for conversion (i.e., all levels are held
steady) and the other is used for switching and settling to the
next channel. Assuming a 50% duty cycle, the signal chain must
settle within 50 ns. With a settling time to 0.1% of 15 ns, the
multiplexer easily satisfies this criterion.
In the example shown, the fourth (spare) channel of the
AD8184 is used to measure a reference voltage. This voltage
would probably be measured less frequently than the R, G and
B signals. Multiplexing a reference voltage offers the advantage
that any temperature drift effects caused by the multiplexer will
equally impact the reference voltage and the to-be-measured sig-
nals. If the fourth channel is unused, it is good design practice
to permanently tie it to ground.
A 4
4 Crosspoint Switch
While large crosspoint arrays are best constructed using highly
integrated devices such as the AD8116, 16
× 16 crosspoint
switch, smaller or irregular sized arrays can be constructed using
4-to-1 multiplexers such as the AD8184. The circuit below
shows a 4
× 4 array, constructed using the AD8184 and buff-
ered using the AD8079, a dual, fixed gain of 2 or 2.2, video
amplifier.
750
750
OUT
1/2 AD8079*
AD8184
IN0-IN3
OUT0
750
750
OUT
1/2 AD8079*
AD8184
IN0-IN3
OUT1
750
750
OUT
1/2 AD8079*
AD8184
IN0-IN3
OUT2
750
750
OUT
1/2 AD8079*
AD8184
IN0-IN3
OUT3
IN0-3
4
*AD8079 IS A DUAL, FIXED GAIN OF 2 AMPLIFIER
Figure 24. 4
× 4 Crosspoint Switch
相关PDF资料 |
PDF描述 |
|---|---|
| VE-BNT-IY-B1 | CONVERTER MOD DC/DC 6.5V 50W |
| AD8184ARZ | IC VIDEO MULTIPLEXER 4X1 14SOIC |
| VE-BNM-IY-B1 | CONVERTER MOD DC/DC 10V 50W |
| VE-BNH-IY-B1 | CONVERTER MOD DC/DC 52V 50W |
| VE-B6L-CU-F1 | CONVERTER MOD DC/DC 28V 200W |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AD8184AR | 功能描述:IC VIDEO MULTIPLEXER 4X1 14SOIC RoHS:否 类别:集成电路 (IC) >> 接口 - 模拟开关，多路复用器，多路分解器 系列:- 其它有关文件:STG4159 View All Specifications 标准包装:5,000 系列:- 功能:开关 电路:1 x SPDT 导通状态电阻:300 毫欧 电压电源:双电源 电压 - 电源，单路/双路(±):±1.65 V ~ 4.8 V 电流 - 电源:50nA 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:7-WFBGA，FCBGA 供应商设备封装:7-覆晶 包装:带卷 (TR) |
| AD8184AR-REEL | 功能描述:IC VIDEO MULTIPLEXER 4X1 14SOIC RoHS:否 类别:集成电路 (IC) >> 接口 - 模拟开关，多路复用器，多路分解器 系列:- 标准包装:1,000 系列:- 功能:多路复用器 电路:1 x 4:1 导通状态电阻:- 电压电源:双电源 电压 - 电源，单路/双路(±):±5V 电流 - 电源:7mA 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:16-SOIC（0.154"，3.90mm 宽） 供应商设备封装:16-SOIC 包装:带卷 (TR) |
| AD8184AR-REEL7 | 功能描述:IC VIDEO MULTIPLEXER 4X1 14SOIC RoHS:否 类别:集成电路 (IC) >> 接口 - 模拟开关，多路复用器，多路分解器 系列:- 标准包装:1,000 系列:- 功能:多路复用器 电路:1 x 4:1 导通状态电阻:- 电压电源:双电源 电压 - 电源，单路/双路(±):±5V 电流 - 电源:7mA 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:16-SOIC（0.154"，3.90mm 宽） 供应商设备封装:16-SOIC 包装:带卷 (TR) |
| AD8184ARZ | 功能描述:IC VIDEO MULTIPLEXER 4X1 14SOIC RoHS:是 类别:集成电路 (IC) >> 接口 - 模拟开关，多路复用器，多路分解器 系列:- 特色产品:MicroPak? 标准包装:1 系列:- 功能:开关 电路:2 x SPST - NC 导通状态电阻:500 毫欧 电压电源:单电源 电压 - 电源，单路/双路(±):1.4 V ~ 4.3 V 电流 - 电源:150nA 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:8-XFDFN 供应商设备封装:8-XSON，SOT833-1 （1.95x1） 包装:Digi-Reel® 其它名称:568-5557-6 |
| AD8184ARZ | 制造商:Analog Devices 功能描述:Analog Switch / Multiplexer (Mux) IC |
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