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參數(shù)資料
型號(hào): OP777
廠商: Analog Devices, Inc.
英文描述: Precision Micropower Single Supply Operational Amplifier
中文描述: 精密微功耗單電源運(yùn)算放大器
文件頁(yè)數(shù): 12/12頁(yè)
文件大小: 162K
代理商: OP777
–12–
REV. 0
C
P
OP777
The OP777 can be very useful in many single supply bridge applica-
tions. Figure 49 shows a single supply bridge circuit in which
its output is linearly proportional to the fractional deviation ( )
of the bridge. Note that
=
R/R.
V
O
= AR1 V
+ 2.5V
R1
REF
=
R1
= 300
REF
192
15V
1M
R1(1+ )
R1
OP777
15V
15V
1M
OP777
V
O
10.1k
0.1 F
2.5V
OP777
R2
V2
V1
3
4
REF
192
2
2
10.1k
RG = 10k
R1(1+ )
R1
3
4
6
Figure 49. Linear Response Bridge, Single Supply
In systems, where dual supplies are available, circuit of Figure 50
could be used to detect bridge outputs that are linearly related to
fractional deviation of the bridge.
REF
192
+15V
15V
V
O
= R2
REF
=
R
R
R2
R1
R
R1
+15V
15V
OP777
OP777
12k
15V
1k
V
O
3
2N2222
R(1+ )
OP777
20k
4
Figure 50. Linear Response Bridge
8-Lead SOIC
(R Suffix)
0.1968 (5.00)
0.1890 (4.80)
8
5
4
1
0.2440 (6.20)
0.2284 (5.80)
PIN 1
0.1574 (4.00)
0.1497 (3.80)
0.0688 (1.75)
0.0532 (1.35)
SEATING
PLANE
0.0098 (0.25)
0.0040 (0.10)
0.0192 (0.49)
0.0138 (0.35)
0.0500
(1.27)
BSC
0.0098 (0.25)
0.0075 (0.19)
0.0500 (1.27)
0.0160 (0.41)
8
°
0
°
0.0196 (0.50)
°
A single supply current source is shown in Figure 51. Large resistors
are used to maintain micropower operation. Output current can be
adjusted by changing the R2B resistor. Compliance voltage is:
V
V
V
L
SAT
S
I
O
= R1
S
R2B
R2
= 1mA 11mA
100k
OP777
R2A
97.3k
2.7V TO 30V
10pF
10pF
100k
R2B
2.7k
I
O
R
LOAD
+
V
L
R1 = 100k
R2 = R2A + R2B
Figure 51. Single Supply Current Source
A single supply instrumentation amplifier using two OP777 ampli-
fiers is shown in Figure 52.
2.7V TO 30V
R2 = 1M
OP777
V
O
2.7V TO 30V
10.1k
OP777
R1 = 10.1k
1M
V1
V2
V
O
= 100 (V2 V1)
0.02mV V1 V2 290mV
2mV V
OUT
29V
USE MATCHED RESISTORS
Figure 52. Single Supply Micropower Instrumentation
Amplifier
8-Lead SOIC
(RM Suffix)
8
5
4
1
0.122 (3.10)
0.114 (2.90)
0.199 (5.05)
0.187 (4.75)
PIN 1
0.0256 (0.65) BSC
0.122 (3.10)
0.114 (2.90)
SEATING
PLANE
0.006 (0.15)
0.002 (0.05)
0.018 (0.46)
0.008 (0.20)
0.043 (1.09)
0.037 (0.94)
0.120 (3.05)
0.112 (2.84)
0.011 (0.28)
0.003 (0.08)
0.028 (0.71)
0.016 (0.41)
33
27
0.120 (3.05)
0.112 (2.84)
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
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