OPA376 Datasheet, PDF (15/42 Pages) Burr-Brown (TI) – Precision, Low Noise, Low Quiescent Current, Operational Amplifier

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OPA376, OPA2376, OPA4376
SBOS406G – JUNE 2007 – REVISED DECEMBER 2015
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
Figure 16. 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 OPA376 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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Product Folder Links: OPA376 OPA2376 OPA4376