OPA348_07 Datasheet, PDF (9/19 Pages) Texas Instruments – 1MHz, 45μA, CMOS, Rail-to-Rail OPERATIONAL AMPLIFIERS

+5V
0.1µF
0.1µF
V_IN
V_IN = 0V to 5V for
0V to 5V output.
OPA348
500Ω
3300pF
8 V+
+In
2
–In
3
ADS7822
12-Bit A/D
GND 4
RC network filters high frequency noise.
1 V_REF
7
DCLOCK
6
D_OUT
5
CS/SHDN
Serial
Interface
NOTE: A/D Input = 0 to V_REF
FIGURE 7. OPA348 in Noninverting Configuration Driving ADS7822.
R₁
1.5kΩ
C₁
1000pF
R₂
1MΩ
Electret
Microphone⁽¹⁾
R₃
1MΩ
NOTE: (1) Electret microphone
powered by R₁.
V+ = +2.7V to 5V
R₄
20kΩ
1/2
OPA2348
R₆
100kΩ
R₉
510kΩ
R₇
51kΩ
R₈
150kΩ
C₃
33pF
1/2
OPA2348
C₂ 1000pF
R₅
20kΩ
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
FIGURE 8. OPA2348 as a Speech Bandpass Filtered Data Acquisition System.
OPA348, 2348, 4348
9
SBOS213C
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