參數(shù)資料
型號(hào)： LBMM
廠商： Linear Integrated Systems
英文描述： Precision, 100UA Gain Selectable Amplifier
中文描述： 精密，100uA的可選增益放大器
文件頁(yè)數(shù)： 13/24頁(yè)
文件大?。?/td> 311K
代理商： LBMM
LT1991
13
1991fb
Figure 6. LT1991 Provides for Easy Attenuation to the Op Amp’s
+Input. The P1 Input Can Be Taken Well Outside of the Supplies
Figure 7. Over 346 Unique Gain Settings Achievable with the
LT1991 by Combining Attenuation with Noninverting Gain
Attenuation Using the P Input Resistors
Attenuation happens as a matter of fact in difference
amplifier configurations, but it is also used for reducing
peak signal level or improving input common mode range
even in single ended systems. When signal conditioning
indicates a need for attenuation, the LT1991 resistors are
ready at hand. The four precision resistors can provide
several attenuation levels, and these are tabulated in
Table 2 as a design reference.
Because the attenuations and the noninverting gains are
set independently, they can be combined. This provides
high gain resolution, about 340 unique gains between
0.077 and 14, as plotted in Figure 7. This is too large a
number to tabulate, but the designer can calculate achiev-
able gain by taking the vector product of the gains and
attenuations in Tables 1 and 2, and seeking the best match.
Average gain resolution is 1.5%, with a worst case of 7%.
Table 2. Configuring the P Pins for Various Attenuations. Those
Shown in Bold Are Functional Even When the Input Drive
Exceeds the Supplies
P9, P3, P1, REF Connection
A
P9
0.0714
Ground
Ground
0.0769
Ground
Ground
0.0909
Ground
0.1
Ground
0.143
Ground
Ground
0.182
Ground
0.2
Float
Ground
0.214
Ground
0.231
Ground
0.25
Float
Ground
0.286
Ground
0.308
Ground
0.357
Ground
0.4
Float
Ground
0.5
Float
0.6
Float
0.643
Drive
Ground
0.692
Drive
Ground
0.714
Drive
Ground
0.75
Float
0.769
Drive
Ground
0.786
Drive
Ground
0.8
Float
0.818
Drive
0.857
Drive
0.9
Drive
0.909
Drive
0.923
Drive
0.929
Drive
1
Drive
P3
P1
REF
Ground
Float
Ground
Float
Drive
Drive
Ground
Ground
Ground
Float
Ground
Float
Drive
Drive
Ground
Ground
Ground
Ground
Ground
Ground
Float
Drive
Ground
Ground
Ground
Ground
Ground
Ground
Ground
Drive
Drive
Drive
Drive
Drive
Drive
Drive
Drive
Ground
Float
Drive
Drive
Drive
Drive
Drive
Drive
Ground
Ground
Float
Drive
Float
Drive
Drive
Drive
Ground
Ground
Float
Drive
Float
Drive
Drive
Float
Float
Float
Drive
Drive
Drive
Drive
Drive
Float
Drive
Drive
Drive
Float
Drive
Float
Float
Drive
Drive
Drive
APPLICATIOU
W
U
U
V
IN
OKAY UP
TO
±
60V
+
50k
150k
450k
450k
5
1
2
3
LT1991 ATTENUATING TO THE +INPUT BY
DRIVING AND GROUNDING AND FLOATING
INPUTS R
A
= 450k, R
G
= 50k, SO A = 0.1.
V
INT
V
INT
V
= A V
A = R
G
/(R
A
+ R
G
)
V
IN
LT1991
R
A
R
G
1991 F06
CLASSICAL ATTENUATOR
4pF
COUNT
0
100
10
1
0.1
0.01
150
1991 F07
50
100
200
250
350
300
G
相關(guān)PDF資料
PDF描述
LBN07076 70MHz SAW Filter 25MHz Bandwidth
LBN07092 70MHz SAW Filter 6MHz Bandwidth
LBN07094 70MHz SAW Filter 17.5MHz Bandwidth
LBN07095 70MHz SAW Filter 18.6MHz Bandwidth
LBN07098 70MHz SAW Filter 8MHz Bandwidth
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