OPA377_15 Datasheet, PDF (9/27 Pages) Texas Instruments – 5MHz, Low-Noise, Single, Dual, Quad CMOS Operational Amplifiers

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OPA377
OPA2377
OPA4377
SBOS504B – FEBRUARY 2010 – REVISED JANUARY 2011
APPLICATION INFORMATION
OPERATING CHARACTERISTICS
The OPA377 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, 0.1mF 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 OPA377 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 21. The OPA377 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
OPA377
V_OUT
V_CM = 2.5V
Figure 21. Basic Single-Supply Connection
COMMON-MODE VOLTAGE RANGE
The input common-mode voltage range of the
OPA377 series extends 100mV beyond the supply
rails. The offset voltage of the amplifier is low, from
approximately (V–) to (V+) – 1V, as shown in
Figure 22. 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 22. Offset and Common-Mode Voltage
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Product Folder Link(s): OPA377 OPA2377 OPA4377