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OPA375 Datasheet(PDF) 33 Page - Texas Instruments

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Part # OPA375
Description  OPA375, OPA2375, OPA4375 500-關V (Maximum), 10-MHz, Low Broadband Noise, RRO, Operational Amplifier
PDF  57 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

OPA375 Datasheet(HTML) 33 Page - Texas Instruments

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1
2
1
1
53
68
(Standard Value)
2
(
||
)
2
100
30
o
u
u
u
u
u
: u
IN
IN
C
nF
nF
R
R
f
k
Hz
S
S
1
1
3.18
3.3
(Standard Value)
2
2
10
5
F
F
H
C
nF
nF
R
f
k
kHz
S
S
o
u
u
u
u
u
: u
1
1
10.11
10
2
2
78.7
200
G
G
L
C
F
F
R
f
Hz
P
P
S
S
o
u
u
u
u
u
: u
10
80
78.7
(closest standard value)
1
126
1
F
G
OPA
R
k
R
V
G
V
:
: o
:
_
1
126
7.93
OUT
RMS
OPA
IN
AC
RMS
V
V
V
G
V
mV
V
_
1
F
OUT
IN
AC
G
R
V
V
R
§
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u ¨
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33
OPA375, OPA2375
www.ti.com
SBOS886C – NOVEMBER 2017 – REVISED JUNE 2020
Product Folder Links: OPA375 OPA2375
Submit Documentation Feedback
Copyright © 2017–2020, Texas Instruments Incorporated
Single-Supply Electret Microphone Preamplifier With Speech Filter (continued)
9.2.2 Detailed Design Procedure
The transfer function defining the relationship between VOUT and the AC input signal is shown in Equation 1.
(1)
The required gain can be calculated based on the expected input signal level and desired output level as shown
in Equation 2.
(2)
Select a standard 10-kΩ feedback resistor and calculate RG from Equation 3.
(3)
To minimize the attenuation in the desired passband from 300 Hz to 3 kHz, set the upper (fH) and lower (fL) cutoff
frequencies outside of the desired bandwidth as:
fL = 200 Hz
(4)
and
fH = 5 kHz
(5)
Select CG to set the fL cutoff frequency using Equation 6.
(6)
Select CF to set the fH cutoff frequency using Equation 7.
(7)
The input signal cutoff frequency must be set low enough such that low-frequency sound waves still pass
through. Therefore, select CIN to achieve a 30-Hz cutoff frequency (fIN) using Equation 8.
(8)
The measured transfer function for the microphone preamplifier circuit is shown in Figure 86 and the measured
THD + N performance of the microphone preamplifier circuit is shown in Figure 87.



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