OPA377-Q1_16 Datasheet, PDF (14/31 Pages) Texas Instruments – Low-Noise, Low Quiescent Current, Precision Automotive Grade Operational Precision Automotive Grade Operational

OPA377-Q1, OPA2377-Q1, OPA4377-Q1
SBOS797A – MAY 2016 – REVISED MAY 2016
www.ti.com
7.3 Feature Description
7.3.1 Operating Characteristics
The OPAx377-Q1 family of amplifiers has parameters that are fully specified from 2.2 V to 5.5 V (±1.1 V to ±2.75
V). 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 section.
7.3.2 Common-Mode Voltage Range
The input common-mode voltage range of the OPAx377-Q1 series extends 100 mV beyond the supply rails. The
offset voltage of the amplifier is low, from approximately (V–) to (V+) – 1 V, as shown in Figure 22. The offset
voltage increases as common-mode voltage exceeds (V+) – 1 V. Common-mode rejection is specified from (V–)
to (V+) – 1.3 V.
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
7.3.3 Input and ESD Protection
The OPAx377-Q1 family incorporates 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, as
long as the current is limited to 10 mA as stated in the Absolute Maximum Ratings table.
Figure 23 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 must be kept to a minimum in noise-
sensitive applications.
I_OVERLOAD
10 mA max
V_IN
5 kW
V+
OPA377-Q1
V_OUT
Copyright © 2016, Texas Instruments Incorporated
Figure 23. Input Current Protection
14
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