+5V
0.1µF
0.1µF
1
VREF
RC Anti-Aliasing
Filter
8
V+
7
6
5
DCLOCK
DOUT
500Ω
ADS7816
12-Bit A/D
Converter
+In
2
Serial
Interface
OPA341
VIN
–In
CS/SHDN
10kΩ
3
3300pF
GND
4
VIN = 0V to 5V for
0V to 5V output.
ENABLE
Timing
Logic
NOTE: A/D Input = 0 to VREF
1.6µs
OA
Enable
3µs
OA
Settling
15µs
Anti-Aliasing Filter Settling
OPA341 SD
1µs
ADS7816 CS/SHDN
5µs
FIGURE 5. OPA341 in Noninverting Configuration Driving the ADS7816 with Timing Diagram.
+5V
Filters 160Hz to 2.4kHz
10MΩ
10MΩ
200pF
VIN
243kΩ
1.74MΩ
1/2
OPA2341
1/2
OPA2341
47pF
220pF
RL
ENABLE A
ENABLE B
FIGURE 6. Speech Bandpass Filter.
< 1pF (prevents gain peaking)
10MΩ
V+
λ
VO
OPA341
ENABLE
FIGURE 7. Transimpedance Amplifier.
OPA341, 2341
11
SBOS202A
BB [ BURR-BROWN CORPORATION ]
