()
參數(shù)資料
型號(hào)： ADA4927-1YCP-EBZ
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 11/24頁(yè)
文件大小： 0K
描述： BOARD EVAL FOR ADA4927-1YCP
標(biāo)準(zhǔn)包裝： 1
每 IC 通道數(shù)： 1 - 單
放大器類(lèi)型： 差分
板類(lèi)型： 裸（未填充）
已供物品： 板
已用 IC / 零件： 16-LFCSP 封裝
ADA4927-1/ADA4927-2
Rev. A | Page 19 of 24
For an unbalanced, single-ended input signal (see Figure 49),
the input impedance is
()
+
×
=
F
G
F
G
SE
IN
R
2
1
,
ADA4927
RL VOUT, dm
+VS
–VS
RG
RF
VOCM
RIN, SE
0
75
74
-04
9
Figure 49. The ADA4927 with Unbalanced (Single-Ended) Input
The input impedance of the circuit is effectively higher than it
would be for a conventional op amp connected as an inverter
because a fraction of the differential output voltage appears at
the inputs as a common-mode signal, partially bootstrapping
the voltage across the input resistor RG. The common-mode
voltage at the amplifier input terminals can be easily determined
by noting that the voltage at the inverting input is equal to the
noninverting output voltage divided down by the voltage divider
formed by RF and RG in the lower loop. This voltage is present at
both input terminals due to negative voltage feedback and is in
phase with the input signal, thus reducing the effective voltage
across RG in the upper loop and partially bootstrapping RG.
Terminating a Single-Ended Input
This section deals with how to properly terminate a single-
ended input to the ADA4927 with a gain of 1, RF = 348 Ω, and
RG = 348 Ω. An example using an input source with a terminated
output voltage of 1 V p-p and a source resistance of 50 Ω illustrates
the four simple 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 50 indicates this open-circuit voltage.
1. The input impedance must be calculated using the following
formula:
464
)
348
(
2
348
1
348
)
(
2
1
=
+
×
=
+
×
=
F
G
F
G
IN
R
RS
50
VS
2V p-p
RIN
464
ADA4927
RL VOUT, dm
+VS
–VS
RF
348
RG
348
RG
348
VOCM
RF
348
07
57
4-
0
50
Figure 50. Calculating Single-Ended Input Impedance RIN
2.
To match the 50 Ω source resistance, the termination
resistor, RT, is calculated using RT||464 Ω = 50 Ω. The
closest standard 1% value for RT is 56.2 Ω.
ADA4927
RL
VOUT, dm
+VS
–VS
RF
348
RS
50
VS
2V p-p
RIN
50
RG
348
RG
348
RT
56.2
VOCM
RF
348
0
757
4-
05
1
Figure 51. Adding Termination Resistor RT
3.
It can be seen from Figure 51 that the effective RG in the
upper feedback 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,
a correction resistor (RTS) is added in series with RG in the
lower loop. RTS is equal to the Thevenin equivalent of the
source resistance RS and the termination resistance RT and
is equal to RS||RT.
RS
50
VS
2V p-p
RTH
26.5
RT
56.2
VTH
1.06V p-p
0
75
74
-05
2
Figure 52. Calculating the Thevenin Equivalent
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