9

®

OPA337, OPA2337

OPA338, OPA2338

FIGURE 6. Low Power, Single-Supply, Speech Bandpass Filtered Data Acquisition System.

1/2

OPA2337E

1/2

OPA2337E

ADS7822

12-Bit A/D

C

3

V

+

GND

3

18

4

5

6

7

–IN

+IN

2

C

2

33pF

DCLOCK

Serial

Interface

1000pF

R

1

1.5k

Ω

R

4

20k

Ω

R

5

20k

Ω

R

6

100k

Ω

R

8

150k

Ω

R

9

510k

Ω

R

7

51k

Ω

D

OUT

V

REF

V+ = +2.7V to 5V

CS/SHDN

C

1

1000pF

Electret

G = 100

Passband 300Hz to 3kHz

R

3

1M

Ω

R

2

1M

Ω

NOTE: (1) Electret microphone

with internal transistor (FET)

powered by R

FIGURE 7. Recommended SOT23-5 and SOT23-8 Solder Footprints.

0.018

(0.457)

0.026

(0.66)

SOT23-8

(Package Drawing #348)

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.

SOT23-5

(Package Drawing #331)

0.0375

(0.9525)

0.0375

(0.9525)

0.075

(1.905)

0.027

(0.686)