OPA2111 Datasheet, PDF (8/13 Pages) Burr-Brown (TI) – Dual Low Noise Precision Difet OPERATIONAL AMPLIFIER

TYPICAL PERFORMANCE CURVES (CONT)
T_A = +25°C, V_CC = ±15VDC unless otherwise noted.
MAXIMUM UNDISTORTED OUTPUT
VOLTAGE vs FREQUENCY
30
20
10
0
1k
10k
100k
1M
Frequency (Hz)
SMALL SIGNAL TRANSIENT RESPONSE
60
40
20
0
–20
–40
–60
0
1
2
3
4
5
Time (µs)
SUPPLY CURRENT vs TEMPERATURE
8
6
4
2
0
–75 –50 –25 0 25 50 75
Ambient Temperature (°C)
100 125
TOTAL HARMONIC DISTORTION
vs FREQUENCY
1
10kΩ
10kΩ
E_O
E_O = 7V
0.1
2kΩ
E_O =
0.01
700mV
0.001
THD + Noise
Residual Test Limit
0.1
1
10
100
1K
10K 100K
Frequency (Hz)
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.
In
1/2 OPA2111
Out
150kΩ
20Ω
–15V
±2mV
OffsetTrim
100kΩ
+15V
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.
®
OPA2111
8