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| OPA376-Q1_016 Datasheet, PDF (20/39 Pages) Texas Instruments – Low-Noise, Low Quiescent Current, Precision Operational Amplifier e-trim Series | |||
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OPA376-Q1, OPA2376-Q1, OPA4376-Q1
SBOS549B â APRIL 2011 â REVISED JUNE 2016
Figure 29 illustrates the OPA2376-Q1 driving a speech bandpass-filtered data acquisition system.
V+ = +2.7V to 5V
Passband 300Hz to 3kHz
R1
1.5kW
C1
1000pF
R2
1MW
Electret
(1)
Microphone
R3
1MW
R4
20kW
1/2
OPA2376
R6
100kW
R9
510kW
R7
51kW
R8
150kW
C3
33pF
1/2
OPA2376
C2 1000pF
R5
20kW
G = 100
VREF 1
8 V+
7
+IN
ADS7822 6
2
-IN
12-Bit A/D 5
3
4
DCLOCK
DOUT
CS/SHDN
GND
www.ti.com
Serial
Interface
(1) Electret microphone powered by R1.
Figure 29. OPA2376-Q1 as a Speech Bandpass-Filtered Data Acquisition System
8.2 Typical Application
Low-pass filters are commonly employed in signal processing applications to reduce noise and prevent aliasing.
The OPA376-Q1 is ideally suited to construct high-speed, high-precision active filters. Figure 30 shows a
second-order, low-pass filter commonly encountered in signal processing applications.
Input
R4
2.94 k
R1
590
R3
499
C2
39 nF
C5
1 nF
±
+
OPA376
Output
Figure 30. Typical Application Schematic
20
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Copyright © 2011â2016, Texas Instruments Incorporated
Product Folder Links: OPA376-Q1 OPA2376-Q1 OPA4376-Q1
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