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参数资料
| 型号： | ADA4941-1YR-EBZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 14/24页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR ADA4941-1YR |
| 标准包装： | 1 |
| 每 IC 通道数： | 1 - 单 |
| 放大器类型： | 差分 |
| 板类型： | 裸（未填充） |
| 已供物品： | 板 |
| 已用 IC / 零件： | 8-SOIC 封装 |
ADA4939-1/ADA4939-2
Rev. 0 | Page 21 of 24
INPUT COMMON-MODE VOLTAGE RANGE
The ADA4939 input common-mode range is centered between the
two supply rails, in contrast to other ADC drivers with level-shifted
input ranges, such as the ADA4937. The centered input common-
mode range is best suited to ac-coupled, differential-to-differential
and dual supply applications.
For 5 V single-supply operation, the input common-mode
range at the summing nodes of the amplifier is specified as
1.1 V to 3.9 V and is specified as 0.9 V to 2.4 V with a 3.3 V
supply. To avoid nonlinearities, the voltage swing at the +IN
and IN terminals must be confined to these ranges.
INPUT AND OUTPUT CAPACITIVE AC COUPLING
Input ac coupling capacitors can be inserted between the source
and RG. This ac coupling blocks the flow of the dc common-
mode feedback current and causes the ADA4939 dc input
common-mode voltage to equal the dc output common-mode
voltage. These ac coupling capacitors must be placed in both
loops to keep the feedback factors matched.
Output ac coupling capacitors can be placed in series between
each output and its respective load. See Figure 54 for an
example that uses input and output capacitive ac coupling.
MINIMUM RG VALUE OF 50 Ω
Due to the wide bandwidth of the ADA4939, the value of RG must
be greater than or equal to 50 Ω to provide sufficient damping in
the amplifier front end. In the terminated case, RG includes the
Thevenin resistance of the source and load terminations.
SETTING THE OUTPUT COMMON-MODE VOLTAGE
The VOCM pin of the ADA4939 is internally biased with a voltage
divider comprising two 20 kΩ resistors at a voltage approximately
equal to the midsupply point, [(+VS) + (VS)]/2. Because of this
internal divider, the VOCM pin sources and sinks current, depending
on the externally applied voltage and its associated source
resistance. Relying on the internal bias results in an output
common-mode voltage that is within about 100 mV of the
expected value.
In cases where more accurate control of the output common-
mode level is required, it is recommended that an external
source or resistor divider be used with source resistance less
than 100 Ω. The output common-mode offset listed in the
by a low impedance voltage source.
It is also possible to connect the VOCM input to a common-mode
level (CML) output of an ADC. However, care must be taken to
ensure that the output has sufficient drive capability. The input
impedance of the VOCM pin is approximately 10 kΩ. If multiple
ADA4939 devices share one reference output, it is recommended
that a buffer be used.
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| ADA4939-2YCP-EBZ | BOARD EVAL FOR ADA4939-2YCP |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADA4941-1YRZ | 功能描述:IC DIFF ADC DVR 18BIT 8-SOIC RoHS:是 类别:集成电路 (IC) >> 线性 - 放大器 - 专用 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:60 系列:- 类型:可变增益放大器 应用:CATV 安装类型:表面贴装 封装/外壳:20-WQFN 裸露焊盘 供应商设备封装:20-TQFN-EP（5x5） 包装:托盘 |
| ADA4941-1YRZ-R7 | 功能描述:IC DIFF ADC DRIVER 18BIT 8SOIC RoHS:是 类别:集成电路 (IC) >> 线性 - 放大器 - 专用 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:60 系列:- 类型:可变增益放大器 应用:CATV 安装类型:表面贴装 封装/外壳:20-WQFN 裸露焊盘 供应商设备封装:20-TQFN-EP（5x5） 包装:托盘 |
| ADA4941-1YRZ-RL | 功能描述:IC DIFF ADC DRIVER 18BIT 8SOIC RoHS:是 类别:集成电路 (IC) >> 线性 - 放大器 - 专用 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:60 系列:- 类型:可变增益放大器 应用:CATV 安装类型:表面贴装 封装/外壳:20-WQFN 裸露焊盘 供应商设备封装:20-TQFN-EP（5x5） 包装:托盘 |
| ADA4950-1 | 制造商:AD 制造商全称:Analog Devices 功能描述:Low Power, Selectable Gain Differential ADC Driver, G = 1, 2, 3 |
| ADA4950-1YCP-EBZ | 功能描述:BOARD EVAL FOR ADA4950-1YCP RoHS:是 类别:编程器，开发系统 >> 评估板 - 运算放大器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:1 系列:- |
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