OPA347NA Datasheet, PDF (10/33 Pages) Texas Instruments – microPower, Rail-to-Rail Operational Amplifiers

+5V
0.1µF
0.1µF
OPA347
V_IN
V_IN = 0V to 5V for
0V to 5V output.
500Ω
3300pF
8 V+
+In
2
–In
3
ADS7822
12-Bit ADC
GND 4
RC network filters high-frequency noise.
1 V_REF
7
DCLOCK
6
D_OUT
5
CS/SHDN
Serial
Interface
NOTE: ADC Input = 0V to V_REF
FIGURE 8. OPA347 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
OPA2347
R₆
100kΩ
R₉
510kΩ
R₇
51kΩ
R₈
150kΩ
C₃
33pF
C₂
1000pF
1/2
OPA2347
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 9. Speech Bandpass Filtered Data Acquisition System.
10
OPA347, 2347, 4347
www.ti.com
SBOS167D