OPA376-Q1 Datasheet, PDF (10/19 Pages) Texas Instruments – Low-Noise, Low Quiescent Current, Precision Operational Amplifier e-trim™ Series

OPA376-Q1
OPA2376-Q1, OPA4376-Q1
SBOS549 – APRIL 2011
APPLICATION INFORMATION
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The OPA376-Q1 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-Q1 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-Q1 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.
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-Q1 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-Q1 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.
R₁
1kW
V_IN
R₂
10kW
+5V
C₁
100nF
OPA376
V_OUT
V_CM = 2.5V
Figure 22. Basic Single-Supply Connection
COMMON-MODE VOLTAGE RANGE
The input common-mode voltage range of the
OPA376-Q1 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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Product Folder Link(s): OPA376-Q1 OPA2376-Q1 OPA4376-Q1