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参数资料
| 型号： | ADA4939-2YCP-EBZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 14/24页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR ADA4939-2YCP |
| 标准包装： | 1 |
| 每 IC 通道数： | 2 - 双 |
| 放大器类型： | 差分 |
| 板类型： | 裸（未填充） |
| 已供物品： | 板 |
| 已用 IC / 零件： | 24-LFCSP 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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相关代理商/技术参数 |
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| ADA4939-2YCPZ-R2 | 制造商:Analog Devices 功能描述:SP AMP DIFFERENTIAL ADC DRVR DUAL 5.25V 24LFCSP - Tape and Reel 制造商:Rochester Electronics LLC 功能描述: |
| ADA4939-2YCPZ-R7 | 功能描述:IC AMP DIFF DUAL ULDIST 24LFCSP RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:2,500 系列:Excalibur™ 放大器类型:J-FET 电路数:1 输出类型:- 转换速率:45 V/µs 增益带宽积:10MHz -3db带宽:- 电流 - 输入偏压:20pA 电压 - 输入偏移:490µV 电流 - 电源:1.7mA 电流 - 输出 / 通道:48mA 电压 - 电源，单路/双路(±):4.5 V ~ 38 V，±2.25 V ~ 19 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 供应商设备封装:8-SOIC 包装:带卷 (TR) |
| ADA4939-2YCPZ-RL | 功能描述:IC AMP DIFF DUAL ULDIST 24LFCSP RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:2,500 系列:Excalibur™ 放大器类型:J-FET 电路数:1 输出类型:- 转换速率:45 V/µs 增益带宽积:10MHz -3db带宽:- 电流 - 输入偏压:20pA 电压 - 输入偏移:490µV 电流 - 电源:1.7mA 电流 - 输出 / 通道:48mA 电压 - 电源，单路/双路(±):4.5 V ~ 38 V，±2.25 V ~ 19 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 供应商设备封装:8-SOIC 包装:带卷 (TR) |
| ADA494 | 制造商:AD 制造商全称:Analog Devices 功能描述:16-Bit, 1 MSPS PulSAR ADC in MSOP QFN |
| ADA4940-1 | 制造商:AD 制造商全称:Analog Devices 功能描述:Ultralow Power, Low Distortion |
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