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OPA348 Datasheet, PDF (9/16 Pages) Texas Instruments – 1MHz, 45UA, CMOS, Rail-to-Rail OPERATIONAL AMPLIFIERS | |||
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+5V
0.1µF
0.1µF
VIN
VIN = 0V to 5V for
0V to 5V output.
OPA348
500â¦
3300pF
8 V+
+In
2
âIn
3
ADS7822
12-Bit A/D
GND 4
RC network filters high frequency noise.
1 VREF
7
DCLOCK
6
DOUT
5
CS/SHDN
Serial
Interface
NOTE: A/D Input = 0 to VREF
FIGURE 7. OPA348 in Noninverting Configuration Driving ADS7822.
R1
1.5kâ¦
C1
1000pF
R2
1Mâ¦
Electret
Microphone(1)
R3
1Mâ¦
NOTE: (1) Electret microphone
powered by R1.
V+ = +2.7V to 5V
R4
20kâ¦
1/2
OPA2348
R6
100kâ¦
R9
510kâ¦
R7
51kâ¦
R8
150kâ¦
C3
33pF
1/2
OPA2348
C2 1000pF
R5
20kâ¦
G = 100
Passband 300Hz to 3kHz
VREF 1
8 V+
7
+IN
ADS7822 6
2
âIN
12-Bit A/D 5
3
4
DCLOCK
DOUT
CS/SHDN
GND
Serial
Interface
FIGURE 8. OPA2348 as a Speech Bandpass Filtered Data Acquisition System.
OPA348, 2348, 4348
9
SBOS213C
www.ti.com
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