OPA376-Q1_016 Datasheet, PDF (15/39 Pages) Texas Instruments – Low-Noise, Low Quiescent Current, Precision Operational Amplifier e-trim Series

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OPA376-Q1, OPA2376-Q1, OPA4376-Q1
SBOS549B – APRIL 2011 – REVISED JUNE 2016
Feature Description (continued)
The OPAx376 in a unity-gain configuration can directly drive up to 250 pF of pure capacitive load. Increasing the
gain enhances the ability of the amplifier to drive greater capacitive loads; see the typical characteristic plot
Figure 16, Small-Signal Overshoot vs Load Capacitance. In unity-gain configurations, capacitive load drive can
be improved by inserting a small (10-Ω to 20-Ω) resistor, R_S, in series with the output, as shown in Figure 22.
This resistor significantly reduces ringing while maintaining dc performance for purely capacitive loads. However,
if there is a resistive load in parallel with the capacitive load, a voltage divider is created, introducing a gain error
at the output and slightly reducing the output swing. The error introduced is proportional to the ratio R_S / R_L, and
is generally negligible at low output current levels.
V+
R_S
OPA376
V_OUT
V_IN
10W to
20W
R_L
C_L
Figure 22. Improving Capacitive Load Drive
7.3.4 Common-Mode Voltage Range
The input common-mode voltage range of the OPAx376-Q1 series extends 100 mV beyond the supply rails. The
offset voltage of the amplifier is very low, from approximately (V–) to (V+) – 1 V, as shown in Figure 23. The
offset voltage increases as common-mode voltage exceeds (V+) –1 V. Common-mode rejection is specified from
(V–) to (V+) – 1.3 V.
3
2
1
0
-1
-2 _-V
+V
-3
-0.5 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
Input Common-Mode Voltage (V)
Figure 23. Offset and Common-Mode Voltage
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