Passband 300Hz to 3kHz
V+ = +2.7V to 5V
R9
510kΩ
R4
R1
R2
20kΩ
1.5kΩ
1MΩ
C3
C1
R7
R8
V+
8
51kΩ
150kΩ
VREF
1
33pF
1000pF
1/2
DCLOCK
OPA2337E
7
1/2
OPA2337E
R3
1MΩ
DOUT
Electret
Microphone(1)
+IN
2
–IN
ADS7822
12-Bit A/D
Serial
Interface
R6
100kΩ
6
5
C2
1000pF
CS/SHDN
3
GND 4
NOTE: (1) Electret microphone
with internal transistor (FET)
powered by R1.
R5
20kΩ
G = 100
FIGURE 6. Low Power, Single-Supply, Speech Bandpass Filtered Data Acquisition System.
SOT23-8
(Package Drawing #348)
SOT23-5
(Package Drawing #331)
0.075
(1.905)
0.027
(0.686)
0.0375
0.0375
(0.9525)
(0.9525)
0.026
(0.66)
0.018
(0.457)
Refer to end of data sheet or Appendix C of Burr-Brown IC Data Book for
tolerances and detailed package drawing. For further information on solder
pads for surface-mount packages, consult Application Bulletin AB-132.
FIGURE 7. Recommended SOT23-5 and SOT23-8 Solder Footprints.
®
OPA337, OPA2337
OPA338, OPA2338
9
BB [ BURR-BROWN CORPORATION ]
