Datasheet

C
1
100nF
R
2
10kW
R
1
1kW
+5V
V
OUT
V
IN
V =2.5V
CM
OPA377
InputOffsetVoltage(mV)
-0.5
3
2
1
0
-1
-2
-3
InputCommon-ModeVoltage(V)
6.00 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
+V
-V
OPA377
OPA2377
OPA4377
www.ti.com 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
Figure 21. Basic Single-Supply Connection
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
COMMON-MODE VOLTAGE RANGE
shown in Figure 21. The OPA377 is configured as a
The input common-mode voltage range of the
basic inverting amplifier with a gain of –10V/V. This
OPA377 series extends 100mV beyond the supply
single-supply connection has an output centered on
rails. The offset voltage of the amplifier is low, from
the common-mode voltage, V
CM
. For the circuit
approximately (V–) to (V+) – 1V, as shown in
shown, this voltage is 2.5V, but may be any value
Figure 22. The offset voltage increases as
within the common-mode input voltage range.
common-mode voltage exceeds (V+) –1V.
Common-mode rejection is specified from (V–) to
(V+) – 1.3V.
Figure 22. Offset and Common-Mode Voltage
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