OP177FS Analog Devices Inc, OP177FS Datasheet - Page 10

• Manufacturer Part Number: OP177FS
• Description: IC OPAMP GP PREC LN 8SOIC
• Manufacturer: Analog Devices Inc

Specifications of OP177FS

• Slew Rate: 0.3 V/µs
• Rohs Status: RoHS non-compliant
• Design Resources: AD7266 SAR ADC in DC-Coupled Differential and Single-Ended Appls (CN0039) DC-Coupled, Single-Ended-to-Differential Conversion Using AD8138 and AD7352 (CN0040) DC-Coupled, Single-Ended-to-Differential Conversion Using AD8138 and AD7356 (CN0041) AD7265 in Differential and Single-Ended Configurations Using AD8022 (CN0048) Unipolar, Precision DC Digital-to-Analog Conversion using AD5450/1/2/3 8-14-Bit DACs (CN0052) DC-Coupled, Single-Ended-to-Differential Conversion Using AD8138 and AD7357 (CN0061)
• Amplifier Type: General Purpose
• Number Of Circuits: 1
• Gain Bandwidth Product: 600kHz
• Current - Input Bias: 1.2nA
• Voltage - Input Offset: 10µV
• Current - Supply: 1.6mA
• Voltage - Supply, Single/dual (±): 6 V ~ 36 V, ±3 V ~ 18 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• No. Of Amplifiers: 1
• Bandwidth: 600kHz
• No. Of Pins: 8
• Peak Reflow Compatible (260 C): No
• Input Bias Current: 2nA
• Input Offset Voltage Max: 25V
• Common Mode Ratio: 140
• Output Type: -
• Current - Output / Channel: -
• -3db Bandwidth: -
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

OP177
PRECISION HIGH GAIN DIFFERENTIAL AMPLIFIER
The high gain, gain linearity, CMRR, and low TCV
OP177 make it possible to obtain performance not previously
available in single stage, very high gain amplifier applications.
See Figure 28.
For best CMR,
In this example, with a 10 mV differential signal, the maximum
errors are listed in Table 6.
Table 6. High Gain Differential Amp Performance
Type
Common-Mode Voltage
Gain Linearity, Worst Case
TCV
TCI
OS
OS
Figure 28. Precision High Gain Differential Amplifier
R1
R2
1kΩ
1kΩ
must equal
R
R
1
3
1MΩ
R
4
2
3
OP177
–
+
+15V
–15V
R3
R4
7
4
Amount
0.1%/V
0.02%
0.0003%/°C
0.008%/°C
0.1µF
0.1µF
1MΩ
R
2
6
OS
of the
Rev. F | Page 10 of 16
ISOLATING LARGE CAPACITIVE LOADS
The circuit shown in Figure 29 reduces maximum slew rate but
allows driving capacitive loads of any size without instability.
Because the 100 Ω resistor is inside the feedback loop, its effect
on output impedance is reduced to insignificance by the high
open loop gain of the OP177.
BILATERAL CURRENT SOURCE
The current sources shown in Figure 30 supply both positive
and negative currents into a grounded load.
Note that
and that for Z
PRECISION ABSOLUTE VALUE AMPLIFIER
The high gain and low TCV
inputs from microvolts to volts. In this circuit, the signal always
appears as a common-mode signal to the op amps (for details,
see Figure 31).
INPUT
Z
R5
O
R2
+
=
R4
R5
R
R
O
must
S
5
R2
to be infinite
+
⎛
⎜
⎝
Figure 29. Isolating Capacitive Loads
R4
R2
R4
=
2
3
+
−
10pF
R3
R1
–
+
OP177
1
R3
R1
+15V
⎞
⎟
⎠
–15V
7
4
OS
0.1µF
0.1µF
assure accurate operation with
R
6
F
100Ω
C
LOAD
OUTPUT