Datasheet

C
3
33pF
V+
GND
3
1
8
4
5
6
7
-IN
+IN
2
C
2
DCLOCK
Serial
Interface
1000pF
R
1
1.5kW
R
4
20kW
R
5
20kW
R6
100kW
R
8
150kW
R
9
510kW
R
7
51kW
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
1MW
R
2
1MW
NOTE: (1) Electret microphone
powered by R .
1
ADS7822
12-Bit A/D
1/2
OPA2348
1/2
OPA2348
ADS7822
12-Bit A/D
DCLOCK
D
OUT
CS/SHDN
OPA348
+5V
V
IN
V+
2
+In
3
-In
V
REF
8
4GND
Serial
Interface
1
0.1 Fm 0.1 Fm
7
6
5
NOTE: A/D Input = 0 to V
REF
V = 0V to 5V for
IN
0V to 5V output.
RC network filters high frequency noise.
500W
3300pF
OPA348
OPA2348
OPA4348
www.ti.com SBOS213G –NOVEMBER 2001–REVISED MARCH 2013
Figure 25. OPA348 in Noninverting Configuration Driving ADS7822
Figure 26. OPA2348 as a Speech Bandpass Filtered Data Acquisition System
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