Datasheet

®
OPA2111 8
TYPICAL PERFORMANCE CURVES (CONT)
T
A
= +25°C, V
CC
= ±15VDC unless otherwise noted.
APPLICATIONS INFORMATION
OFFSET VOLTAGE ADJUSTMENT
The OPA2111 offset voltage is laser-trimmed and will
require no further trim for most applications.
Offset voltage can be trimmed by summing (see Figure 1).
With this trim method there will be no degradation of input
offset drift.
INPUT PROTECTION
Conventional monolithic FET operational amplifiers require
external current-limiting resistors to protect their inputs
against destructive currents that can flow when input FET
gate-to-substrate isolation diodes are forward-biased. Most
BIFET amplifiers can be destroyed by the loss of –V
CC
.
Because of its dielectric isolation, no special protection is
needed on the OPA2111. Of course, the differential and
common-mode voltage limits should be observed. Static
damage can cause subtle changes in amplifier input charac-
teristics without necessarily destroying the device. In preci-
sion operational amplifiers (both bipolar and FET types),
this may cause a noticeable degradation of offset voltage and
drift.
Static protection is recommended when handling any preci-
sion IC operational amplifier.
FIGURE 1. Offset Voltage Trim.
MAXIMUM UNDISTORTED OUTPUT
VOLTAGE vs FREQUENCY
100k
Frequency (Hz)
1k 10k 1M
30
20
10
Output Voltage (Vp-p)
0
SUPPLY CURRENT vs TEMPERATURE
8
6
4
2
–50 –25 0 25 50 75 100 125
Ambient Temperature (°C)
Supply Current (mA)
–75
0
SMALL SIGNAL TRANSIENT RESPONSE
1
Time (µs)
05
Output Voltage (mV)
234
60
40
20
0
–20
–40
–60
TOTAL HARMONIC DISTORTION
vs FREQUENCY
1
0.1
0.01
Total Harmonic Distortion (%)
0.1 1 10 100 1K 10K 100K
THD + Noise
Residual Test Limit
0.001
Frequency (Hz)
E
O
2kΩ
10kΩ
10kΩ
E
O
= 7V
E
O
=
700mV
1/2 OPA2111
150kΩ
Out
20Ω
100kΩ
–15V
+15V
±2mV 
OffsetTrim
In