OPA376_15 Datasheet, PDF (10/31 Pages) Texas Instruments – Low-Noise, Low Quiescent Current, Precision Operational Amplifier e-trim Series

OPA376
OPA2376
OPA4376
SBOS406F – JUNE 2007 – REVISED MARCH 2013
APPLICATION INFORMATION
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The OPA376 family of operational amplifiers is built
using e-trim, a proprietary technique in which offset
voltage is adjusted during the final steps of
manufacturing. This technique compensates for
performance shifts that can occur during the molding
process. Through e-trim, the OPA376 family delivers
excellent offset voltage (5μV, typ). Additionally, the
amplifier boasts a fast slew rate, low drift, low noise,
and excellent PSRR and A_OL. These 5.5MHz CMOS
op amps operate on 760μA (typ) quiescent current.
OPERATING CHARACTERISTICS
The OPA376 family of amplifiers has parameters that
are fully specified from 2.2V to 5.5V (±1.1V to
±2.75V). Many of the specifications apply from –40°C
to +125°C. Parameters that can exhibit significant
variance with regard to operating voltage or
temperature are presented in the Typical
Characteristics.
R₁
1kW
V_IN
R₂
10kW
+5V
C₁
100nF
OPA376
V_OUT
V_CM = 2.5V
GENERAL LAYOUT GUIDELINES
For best operational performance of the device, good
printed circuit board (PCB) layout practices are
required. Low-loss, 0.1μF bypass capacitors must be
connected between each supply pin and ground,
placed as close to the device as possible. A single
bypass capacitor from V+ to ground is applicable to
single-supply applications.
BASIC AMPLIFIER CONFIGURATIONS
The OPA376 family is unity-gain stable. It does not
exhibit output phase inversion when the input is
overdriven. A typical single-supply connection is
shown in Figure 22. The OPA376 is configured as a
basic inverting amplifier with a gain of –10V/V. This
single-supply connection has an output centered on
the common-mode voltage, V_CM. For the circuit
shown, this voltage is 2.5V, but may be any value
within the common-mode input voltage range.
Figure 22. Basic Single-Supply Connection
COMMON-MODE VOLTAGE RANGE
The input common-mode voltage range of the
OPA376 series extends 100mV beyond the supply
rails. The offset voltage of the amplifier is very low,
from approximately (V–) to (V+) – 1V, as shown in
Figure 23. The offset voltage increases as common-
mode voltage exceeds (V+) –1V. Common-mode
rejection is specified from (V–) to (V+) – 1.3V.
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
10
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