Datasheet

OPA347, 2347, 4347
10
SBOS167D
www.ti.com
FIGURE 8. OPA347 in Noninverting Configuration Driving ADS7822.
FIGURE 9. Speech Bandpass Filtered Data Acquisition System.
ADS7822
12-Bit ADC
DCLOCK
D
OUT
CS/SHDN
OPA347
+5V
V
IN
V+
2
+In
3
–In
V
REF
8
4GND
Serial
Interface
1
0.1µF 0.1µF
7
6
5
NOTE: ADC Input = 0V to V
REF
V
IN
= 0V to 5V for
0V to 5V output.
RC network filters high-frequency noise.
500Ω
3300pF
C
3
33pF
V
+
GND
3
1
8
4
5
6
7
–IN
+IN
2
DCLOCK
Serial
Interface
C
2
1000pF
R
1
1.5kΩ
R
4
20kΩ
R
5
20kΩ
R
6
100kΩ
R
8
150kΩ
R
9
510kΩ
R
7
51kΩ
D
OUT
V
REF
V+ = +2.7V to 5V
CS/SHDN
C
1
1000pF
Electret
Microphone
(1)
G = 100
Passband 300Hz to 3kHz
R
3
1MΩ
R
2
1MΩ
NOTE: (1) Electret microphone
powered by R
1
.
ADS7822
12-Bit A/D
1/2
OPA2347
1/2
OPA2347