OPA341, 2341

11

SBOS202A

FIGURE 7. Transimpedance Amplifier.

FIGURE 5. OPA341 in Noninverting Configuration Driving the ADS7816 with Timing Diagram.

FIGURE 6. Speech Bandpass Filter.

ADS7816

12-Bit A/D

Converter

DCLOCK

D

OUT

CS/SHDN

OPA341

+5V

V

IN

V+

2

+In

3

–In

V

REF

8

4

GND

Serial

Interface

1

0.1

µF

0.1

µF

7

6

5

NOTE: A/D Input = 0 to V

REF

V

0V to 5V output.

500

Ω

3300pF

10k

Ω

ENABLE

Timing

Logic

1.6

µs

OA

Enable

3

µs

OA

Settling

15

µs

Anti-Aliasing Filter Settling

RC Anti-Aliasing

Filter

OPA341 SD

ADS7816 CS/SHDN

1

µs

5

µs

243k

Ω

10M

Ω

10M

Ω

1.74M

Ω

220pF

47pF

200pF

1/2

OPA2341

+5V

ENABLE A

ENABLE B

V

IN

R

L

1/2

OPA2341

Filters 160Hz to 2.4kHz

OPA341

V

O

10M

Ω

< 1pF (prevents gain peaking)

V+

ENABLE

λ