OP77_15 Datasheet, PDF (12/16 Pages) Analog Devices – Next Generation OP07 Ultralow Offset Voltage Operational Amplifier

OP77
PRECISION CURRENT SINKS
V+
R_L
V_IN
OP77
200Ω
I_O
IRF520
I_O
=
V_IN
R1
V_IN > 0V
FULL SCALE OF 1V.
I_O = 1A/V
R1
1Ω
1W
Figure 31. Positive Current Sink
R1
200Ω
OP77
V_IN
IRF520
I_O
=
V_IN
R1
V_IN > 0V
I_O
R_L
V–
Figure 32. Positive Current Source
The simple high-current sinks, shown Figure 31 and Figure 32,
require the load to float between the power supply and the sink.
In these circuits, the high gain, high CMRR, and low TCVOS of
the OP77 ensure high accuracy.
The high gain and low TCVOS ensure accurate operation with
inputs from microvolts to volts. In Figure 33, the signal always
appears as a common-mode signal to the op amps. The
OP77EZ CMRR of 1 μV/V ensures errors of less than 2 ppm.
+15V
0.1µF
2
7
OP77E ⁶
V_IN
3
4
0.1µF
C1
30pF
1kΩ
1kΩ
+15V
0.1µF
D1
1N4148
2
7
D2
OP77E ⁶
3
2N4393
4
0.1µF
R3
2kΩ
–15V
–15V
Figure 33. Precision Absolute Value Amplifier
V_OUT
0 < V_OUT < 10V
15V
+
2
2
2
10µF
REF-01
V_O ⁶
4
REF-01
V_O ⁶
4
REF-01
V_O ⁶
4
100Ω
100Ω
OP77
100Ω
0.1µF
Figure 34. Low Noise Precision Reference
V_OUT
Rev. E | Page 12 of 16