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參數(shù)資料
| 型號： | ADA4950-1YCP-EBZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 14/28頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD EVAL FOR ADA4950-1YCP |
| 標準包裝： | 1 |
| 每 IC 通道數(shù)： | 1 - 單 |
| 放大器類型： | 差分 |
| 板類型： | 裸（未填充） |
| 已供物品： | 板 |
| 已用 IC / 零件： | 16-LFCSP 封裝 |
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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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