OPA376-Q1_15 Datasheet, PDF (13/20 Pages) Texas Instruments – Low-Noise, Low Quiescent Current, Precision Operational Amplifier e-trim™ Series

OPA376-Q1
OPA2376-Q1, OPA4376-Q1
www.ti.com
An INA163 instrumentation amplifier provides
differential inputs and receives the balanced audio
signals from the cable.
SBOS549 – APRIL 2011
The INA163 gain may be set from 0dB to 80dB by
selecting the R_G value. The INA163 circuit is typical
of the input circuitry used in mixing consoles.
Panasonic
WM-034CY
Microphone
R₁
2.7kW
1/2
OPA2376
1kW
1kW
10kW
+
10mF
1/2
OPA2376
100W
33mF
D₁
5.1V
Phantom Power
(Provides power source for microphone)
48V
1mF
C₂
R₆
33mF 100W
C₃
R₇
33mF 100W
R₈
4.7kW
R₉
4.7kW
2
3
1
2
3
1
Low-level differential audio signal
is transmitted differentially on the
same cable as power to the microphone.
R₁₀
6.8kW
R₁₁
6.8kW
10mF
10mF
+15V
R_G
INA163
3.3kW
3.3kW
-15V
Typical microphone input circuit used in mixing consoles.
Figure 28. Phantom-Powered Electret Microphone
R₁
1.5kW
C₁
1000pF
R₂
1MW
Electret
Microphone⁽¹⁾
R₃
1MW
V+ = +2.7V to 5V
R₄
20kW
1/2
OPA2376
R₆
100kW
R₉
510kW
R₇
51kW
R₈
150kW
C₃
33pF
1/2
OPA2376
C₂ 1000pF
R₅
20kW
G = 100
Passband 300Hz to 3kHz
V_REF 1
8 ^V+
7
+IN
ADS7822 ⁶
2
-IN
12-Bit A/D ₅
3
4
DCLOCK
D_OUT
CS/SHDN
GND
Serial
Interface
NOTE: (1) Electret microphone powered by R₁.
Figure 29. OPA2376-Q1 as a Speech Bandpass Filtered Data Acquisition System
Copyright © 2011, Texas Instruments Incorporated
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