APPLICATIONS INFORMATION
OPA130 series op amps are unity-gain stable and suitable
for a wide range of general-purpose applications. Power
supply pins should be bypassed with 10nF ceramic capaci-
tors or larger.
OPA130 op amps are free from unexpected output phase-
reversal common with FET op amps. Many FET-input op
amps exhibit phase-reversal of the output when the input
common-mode voltage range is exceeded. This can occur in
voltage-follower circuits, causing serious problems in
control loop applications. OPA130 series op amps are free
from this undesirable behavior. All circuitry is completely
independent in dual and quad versions, assuring normal
behavior when one amplifier in a package is overdriven or
short-circuited.
10nF
V+
Trim Range: ±5mV typ
100kΩ
7
2
3
10nF
1
5
OPA130
4
6
OPA130 single op amp only.
Use offset adjust pins only to null
offset voltage of op amp—see text.
V–
FIGURE 1. OPA130 Offset Voltage Trim Circuit.
INPUT BIAS CURRENT
OPERATING VOLTAGE
OPA130 series op amps operate with power supplies from
±2.25V
to
±18V
with excellent performance. Although speci-
fications are production tested with
±15V
supplies, most
behavior remains unchanged throughout the full operating
voltage range. Parameters which vary significantly with
operating voltage are shown in the typical performance
curves.
The input bias current is approximately 5pA at room tem-
perature and increases with temperature as shown in the
Typical Characteristic curve
Input Bias Current vs Tempera-
ture.
Input stage cascode circuitry assures that the input bias
current remains virtually unchanged throughout the full input
common-mode range of the OPA130. See the Typical
Characteristic curve
Input Bias Current vs Common-Mode
Voltage.
OFFSET VOLTAGE TRIM
Offset voltage of OPA130 series amplifiers is laser trimmed
and usually requires no user adjustment. The OPA130
(single op amp version) provides offset voltage trim con-
nections on pins 1 and 5. Offset voltage can be adjusted by
connecting a potentiometer as shown in Figure 1. This
adjustment should be used only to null the offset of the op
amp, not to adjust system offset or offset produced by the
signal source. Nulling offset that is not produced by the
amplifier will change the offset voltage drift behavior of the
op amp.
OPA130, OPA2130, OPA4130
SBOS053A
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