OP777ARM AD [Analog Devices], OP777ARM Datasheet - Page 12

• Manufacturer Part Number: OP777ARM
• Description: Precision Micropower Single Supply Operational Amplifier
• Manufacturer: AD [Analog Devices]

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.
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.
4
4
15V
REF
192
15V
REF
192
2
3
3
0.006 (0.15)
0.002 (0.05)
2.5V
R2
0.122 (3.10)
0.114 (2.90)
0.1 F
OP777
SEATING
PLANE
PIN 1
R1(1+ )
20k
0.0256 (0.65) BSC
R1
0.122 (3.10)
0.114 (2.90)
0.120 (3.05)
0.112 (2.84)
8
0.018 (0.46)
0.008 (0.20)
1
OP777
4
+15V
REF
192
15V
8-Lead SOIC
5
4
R1
12k
1k
2
R1(1+ )
(RM Suffix)
3
0.199 (5.05)
0.187 (4.75)
OP777
0.043 (1.09)
0.037 (0.94)
6
R(1+ )
1M
V1
V2
R1
0.011 (0.28)
0.003 (0.08)
10.1k
15V
2N2222
RG = 10k
R1
R
OP777
0.120 (3.05)
0.112 (2.84)
10.1k
33
27
V
O
= 300
=
=
+15V
R2
15V
0.028 (0.71)
0.016 (0.41)
AR1 V
R1
Dimensions shown in inches and (mm).
R1
OP777
V
2R2
1M
O
15V
OUTLINE DIMENSIONS
=
=
REF
OP777
R2
R1
R
R
V
REF
+ 2.5V
V
O
V
O
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:
A single supply instrumentation amplifier using two OP777 ampli-
fiers is shown in Figure 52.
0.1574 (4.00)
0.1497 (3.80)
0.0098 (0.25)
0.0040 (0.10)
V1
V2
SEATING
1M
PLANE
2.7V TO 30V
V
PIN 1
O
2.7V TO 30V
= 100 (V2
0.02mV
2mV
USE MATCHED RESISTORS
R2 = R2A + R2B
I
10.1k
0.1968 (5.00)
0.1890 (4.80)
0.0500
O
(1.27)
BSC
8
1
=
= 1mA
R1
R1 = 100k
V
OP777
V
OUT
0.0192 (0.49)
0.0138 (0.35)
R2
100k
V1
0.0688 (1.75)
0.0532 (1.35)
L
10pF
5
4
R2B
V1)
11mA
8-Lead SOIC
≤
29V
0.2440 (6.20)
0.2284 (5.80)
V2
(R Suffix)
V
R1 = 10.1k
S
V
290mV
SAT
0.0098 (0.25)
0.0075 (0.19)
97.3k
R2A
OP777
−
100k
10pF
V
2.7V TO 30V
S
R2 = 1M
V
R2B
2.7k
8°
0°
L
0.0196 (0.50)
0.0099 (0.25)
I
O
R
0.0500 (1.27)
0.0160 (0.41)
OP777
+
LOAD
V
x 45°
O