OPA365-Q1_16 Datasheet, PDF (12/22 Pages) Texas Instruments – Single-Supply Operational Amplifiers

OPA365-Q1, OPA2365-Q1
SBOS512D – MARCH 2010 – REVISED DECEMBER 2015
www.ti.com
8.3 Feature Description
8.3.1 Operating Characteristics
The OPA365-Q1 amplifier parameters are fully specified from 2.2 V to 5.5 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 Typical Characteristics.
8.3.2 Basic Amplifier Configurations
As with other single-supply operational amplifiers, the OPA365-Q1 may be operated with either a single supply or
dual supplies (see Figure 20). A typical dual-supply connection is shown in Figure 20, which is accompanied by a
single-supply connection. The OPA365-Q1 device is configured as a basic inverting amplifier with a gain of −10
V/V. The dual-supply connection has an output voltage centered on zero, while the single− supply connection
has an output centered on the common-mode voltage V_CM. For the circuit shown, this voltage is 1.5 V, but may
be any value within the common-mode input voltage range. The OPA365-Q1 V_CM range extends 100 mV beyond
the power-supply rails.
R₂
10kΩ
R₂
10kΩ
R₁
1kΩ
V_IN
+1.5 V
C₁
100nF
V+
OPA365
V−
C₂
100nF
−1.5V
V_OUT
R₁
1kΩ
V _IN
V_CM =1.5V
+3V
C₁
100nF
V+
OPA365
V−
V _OUT
a) Dual Supply Connection
b) Single Supply Connection
Figure 20. Basic Circuit Connections
Figure 21 shows a single-supply, electret microphone application where V_CM is provided by a resistive divider.
The divider also provides the bias voltage for the electret element.
Clean 3.3V Supply
49kΩ
4kΩ
3.3V
OPA365
V_OUT
Electret
6kΩ
5kΩ
Microphone
1µF
Figure 21. Microphone Preamplifier
12
Submit Documentation Feedback
Copyright © 2010–2015, Texas Instruments Incorporated
Product Folder Links: OPA365-Q1 OPA2365-Q1