OP77BJ AD [Analog Devices], OP77BJ Datasheet - Page 11

• Manufacturer Part Number: OP77BJ
• Description: NEXT GENERATION OP07, ULTRALOW OFFSET VOLTAGE OPERATIONAL AMPLIFIER
• Manufacturer: AD [Analog Devices]

APPLICATIONS INFORMATION
The high gain, gain linearity, CMRR, and low TCVos of the
OP77 make it possible to obtain performance not previously
available in single-stage very high-gain amplifier applications.
For best CMR,
with a 10 mV differential signal, the maximum errors are as listed
in Table I.
TYPE
COMMON-MODE VOLTAGE
GAIN LINEARITY, WORST CASE
TCVOS
TCI OS
This circuit reduces maximum slew-rate but allows driving
capacitive loads of any size without instability. Because the boon
resistor is inside the feedback loop, its effect on output imped-
ance is reduced to insignificance by the high open-loop gain
of the OP77.
REV. C
INPUT
Figure 7. Precision High-Gain Differential Amplifier
Figure 8. Isolating Large Capacitive Loads
R
S
1k
1k
R1
R3
R
R
1
2
Table I. Maximum Errors
10pF
2
3
must equal
1M
OP77
R4
2
3
+15V
–15V
OP77E
4
7
+15V
0.1 F
0.1 F
–15V
R
7
4
0.1 F
0.1 F
F
6
R
R
6
1M
3
4
R2
. In this example,
100
AMOUNT
0.01%/V
0.02%
0.003%/∞C
0.008%/∞C
C
LOAD
OUTPUT
–11–
Bilateral Current Source
These current sources will supply both positive and negative
current into a grounded load.
Note that
and that for Z
V
IN
R1
R2
Z
V
IN
O
Figure 10. 100 mA Current Source
O
=
100k
100k
Figure 9. Basic Current Source
to be infinite,
2
R1
R2
3
R
R
5
5
OP77
R
Ê
Á
Ë
+
2
R
R
R
4
2
2
3
4
R4
R3
+
OP77
6
R
R
1
ˆ
˜
¯
3
1
990
1k
R3
R4
6
+15V
–15V
2N2222
2N2907
I
GIVEN R3 = R4
OUT
= V
10
R5
I
OUT
IN
R5
(
< 15mA
R1 – R5
R3
I
OUT
OP77
R5, R1 = R2
)
< 100mA