OPA376 Datasheet, PDF (10/23 Pages) Burr-Brown (TI) – Precision, Low Noise, Low Quiescent Current, Operational Amplifier

OPA376
OPA2376
OPA4376
SBOS406B – JUNE 2007 – REVISED SEPTEMBER 2007
APPLICATION INFORMATION
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OPERATING CHARACTERISTICS
The OPA376 family of amplifiers has parameters that
are fully specified from +2.2V to +5.5V. 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 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.
R₂
10kW
+5V
R₁
1kW
V_IN
C₁
100nF
OPA376
V_OUT
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
Common-Mode (V)
Figure 23. Offset and Common-Mode Voltage
INPUT AND ESD PROTECTION
The OPA376 family incorporate internal electrostatic
discharge (ESD) protection circuits on all pins. In the
case of input and output pins, this protection primarily
consists of current steering diodes connected
between the input and power-supply pins. These ESD
protection diodes also provide in-circuit, input
overdrive protection, provided that the current is
limited to 10mA as stated in the Absolute Maximum
Ratings. Figure 24 shows how a series input resistor
may be added to the driven input to limit the input
current. The added resistor contributes thermal noise
at the amplifier input and its value should be kept to a
minimum in noise-sensitive applications.
V_CM = 2.5V
Figure 22. Basic Single-Supply Connection
I_OVERLOAD
10mA max
V_IN
5kW
V+
OPA376
V_OUT
Figure 24. Input Current Protection
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Product Folder Link(s): OPA376 OPA2376 OPA4376