參數(shù)資料
型號： ADA4930-2YCP-EBZ
廠商： Analog Devices Inc
文件頁數(shù)： 16/29頁
文件大?。?/td> 0K
描述： BOARD EVAL FOR ADA4930-2YCP
標(biāo)準(zhǔn)包裝： 1
每 IC 通道數(shù)： 2 - 雙
放大器類型： 差分
板類型： 裸（未填充）
已供物品： 板
已用 IC / 零件： 24-LFCSP 封裝
ADA4930-1/ADA4930-2
Rev. A | Page 22 of 28
Input Common-Mode Adjustment with Resistors
Calculate the following:
1.
β1 and β2. For the circuit shown in Figure 54, β1 = 0.5 and
β2 = 0.5.
The circuit shown in Figure 54 shows an alternate method to
bias the amplifier inputs, eliminating the dc source.
2.
RCM for VP min = 0.3 V and VIN min = 0.5 V. RCM = 9933 Ω.
ADA4930
RL VOUT, dm
+VS
–VS
3.3V
RS
50
RG1
301
RG2
301
RF2
301
RF1
301
RCM
VOCM
RCM
VS
VSOURCE
2V p-p
RT
09
20
9-
1
52
VIN
3.
The new values for β1 and β2. β1 = 0.4925 and β2 = 0.4925.
4.
The input impedance using the following:
+
=
=
β1β2
R
β2
β1
β2
β1
R
V
R
G1
F1
G1
INP
P
G1
SE
IN
1
RIN-SE = 399.35 Ω.
5.
RT, RTH, and VTH. RT = 57.16 Ω, RTH = 26.67 Ω, and
VTH = 1.067 V.
6.
The new values for RG1 and RG2. RG2 = 160.55 Ω and
RG1 = 133.88 Ω.
7.
The new values for β1 and β2. β1 = 0.284 and β2 = 0.317.
Figure 54. Single-Supply Biasing Scheme with Resistors
8.
The new value of RCM. RCM = 4759.63 Ω.
Define β1 = RP/RF1 and β2 = RN/RF2, where RP = RG1||RCM||RF1
and RN = RG2||RCM||RF2.
9.
Repeat Step 3 through Step 8 until the values of RG1 and RG2
remain constant between iterations. After four iterations,
the final circuit is shown in Figure 55.
Set RF1 = RF2 = RF to maintain a balanced system, as shown.
Write a nodal equation at VP and solve for VP.
ADA4930
RL VOUT, dm
+VS
–VS
RS
50
RG1
142
RG2
170
RF2
301
RF1
301
RCM
1.87k
RCM
1.87k
VOCM
+VS
VS
2V p-p
RT
65.1
09
20
9-
1
53
+
=
CM
F
S
OCM
IN
G
F
P
R
V
R
β2
β1
β1β2
V
2
1
Determine VP min. This is the minimum input common-mode
voltage from the Specifications section. For a 3.3 V supply,
VP min = 0.3 V.
Determine the minimum input voltage, VIN min at the output of
the source. Recognize that once properly terminated, the source
voltage is of its open circuit value. Therefore, VIN min = 0.5 V.
Rearrange the VP equation for RCM
+
=
OCM
min
IN
G
F
P
F
S
CM
V
R
V
β1β2
β2
β1
R
V
R
2
1
min
Figure 55. Single-Supply, Single-Ended Input System with Bias Resistors
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