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| 型号： | ADA4950-1YCPZ-R7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 14/28页 |
| 文件大小： | 0K |
| 描述： | IC AMP DIFF LP 114MA 16LFCSP |
| 标准包装： | 1 |
| 放大器类型： | 差分 |
| 电路数： | 1 |
| 输出类型： | 差分 |
| 转换速率： | 2900 V/µs |
| -3db带宽： | 750MHz |
| 电压 - 输入偏移： | 200µV |
| 电流 - 电源： | 9.5mA |
| 电流 - 输出 / 通道： | 114mA |
| 电压 - 电源，单路/双路(±)： | 3 V ~ 11 V，±1.5 V ~ 5.5 V |
| 工作温度： | -40°C ~ 105°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-VFQFN 裸露焊盘，CSP |
| 供应商设备封装： | 16-LFCSP-VQ |
| 包装： | 标准包装 |
| 产品目录页面： | 765 (CN2011-ZH PDF) |
| 其它名称： | ADA4950-1YCPZ-R7DKR |
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Data Sheet
ADA4950-1/ADA4950-2
Rev. A | Page 21 of 28
Terminating a Single-Ended Input
This section describes how to properly terminate a single-ended
input to the ADA4950-x with a gain of 1, RF = 500 , and RG =
500 . An example using an input source with a terminated output
voltage of 1 V p-p and source resistance of 50 illustrates the
steps that must be followed. Note that because the terminated
output voltage of the source is 1 V p-p, the open-circuit output
voltage of the source is 2 V p-p. The source shown in Figure 56
indicates this open-circuit voltage.
1. The input impedance is calculated using the following
formula:
Ω
667
)
500
(
2
500
1
500
)
(
2
1
,
=
+
×
=
+
×
=
F
G
F
G
se
IN
R
RS
50
VS
2V p-p
RIN, se
667
ADA4950-x
RL VOUT, dm
+VS
–VS
RG
500
RG
500
RF
500
RF
500
VOCM
07957-
156
Figure 56. Calculating Single-Ended Input Impedance, RIN
2. To match the 50 source resistance, calculate the
termination resistor, RT, using RT||667 = 50 . The
closest standard 1% value for RT is 53.6 .
ADA4950-x
RL
VOUT, dm
+VS
–VS
RS
50
RG
500
RG
500
RF
500
RF
500
VOCM
VS
2V p-p
RIN, se
50
RT
53.6
07957-
157
Figure 57. Adding Termination Resistor, RT
loop is now greater than the RG in the lower loop due to the
addition of the termination resistors. To compensate for the
imbalance of the gain resistors, add a correction resistor (RTS)
in series with RG in the lower loop. RTS is the Thevenin
equivalent of the source resistance, RS, and the termination
resistance, RT, and is equal to RS||RT.
RTS = RTH = RS||RT = 25.9
RS
50
VS
2V p-p
RT
53.6
RTH
25.9
VTH
1.03V p-p
07957-
052
Figure 58. Calculating the Thevenin Equivalent
Note that VTH is greater than 1 V p-p, which was obtained
with RT = 50 . The modified circuit with the Thevenin
equivalent (closest 1% value used for RTH) of the terminated
source and RTS in the lower feedback loop is shown in
ADA4950-x
RL VOUT, dm
+VS
–VS
RTH
25.5
RG
500
RG
500
RF
500
RF
500
VOCM
VTH
1.03V p-p
RTS
25.5
07957-
059
Figure 59. Thevenin Equivalent and Matched Gain Resistors
Figure 59 presents a tractable circuit with matched feedback
loops that can be easily evaluated.
It is useful to point out two effects that occur with a terminated
input. The first is that the value of RG is increased in both loops,
lowering the overall closed-loop gain. The second is that VTH is
a little larger than 1 V p-p, as it would be if RT = 50 . These two
effects have opposite impacts on the output voltage, and for
large resistor values in the feedback loops (~1 k), the effects
essentially cancel each other out. For small RF and RG, or high
gains, however, the diminished closed-loop gain is not canceled
completely by the increased VTH. This can be seen by evaluating
The desired differential output in this example is 1 V p-p
because the terminated input signal is 1 V p-p and the closed-
loop gain = 1. The actual differential output voltage, however, is
equal to (1.03 V p-p)(500/525.5) = 0.98 V p-p.
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相关代理商/技术参数 |
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| ADA4950-1YCPZ-RL | 功能描述:IC AMP DIFF LP 114MA 16LFCSP RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:50 系列:- 放大器类型:J-FET 电路数:2 输出类型:- 转换速率:3.5 V/µs 增益带宽积:1MHz -3db带宽:- 电流 - 输入偏压:30pA 电压 - 输入偏移:2000µV 电流 - 电源:200µA 电流 - 输出 / 通道:- 电压 - 电源，单路/双路(±):7 V ~ 36 V，±3.5 V ~ 18 V 工作温度:0°C ~ 70°C 安装类型:通孔 封装/外壳:8-DIP（0.300"，7.62mm） 供应商设备封装:8-PDIP 包装:管件 |
| ADA4950-2 | 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 |
| ADA4950-2YCP-EBZ | 功能描述:BOARD EVAL FOR ADA4950-2YCP 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:- |
| ADA4950-2YCPZ-R2 | 制造商:Analog Devices 功能描述:SP Amp DIFF AMP Dual 制造商:Analog Devices 功能描述:FIXED GAIN 1,2&3 DIFF ADC DRIVER - Tape and Reel 制造商:Analog Devices 功能描述:SP Amp DIFF AMP Dual }5.5V/11V 24-Pin LFCSP EP |
| ADA4950-2YCPZ-R7 | 功能描述:IC AMP DIFF DUAL 114MA 24LFCSP RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:2,500 系列:- 放大器类型:通用 电路数:4 输出类型:- 转换速率:0.6 V/µs 增益带宽积:1MHz -3db带宽:- 电流 - 输入偏压:45nA 电压 - 输入偏移:2000µV 电流 - 电源:1.4mA 电流 - 输出 / 通道:40mA 电压 - 电源，单路/双路(±):3 V ~ 32 V，±1.5 V ~ 16 V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:14-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:14-TSSOP 包装:带卷 (TR) 其它名称:LM324ADTBR2G-NDLM324ADTBR2GOSTR |
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