+5V
For improved accuracy use OPA340.
0.1µF
0.1µF
VREF
1
8
V+
7
6
5
DCLOCK
DOUT
500Ω
+In
2
Serial
Interface
ADS7816
12-Bit A/D
OPA343
VIN
–In
CS/SHDN
3
3300pF
GND
4
VIN = 0V to 5V for
0V to 5V output.
NOTE: A/D Input = 0 to VREF
RC network filters high frequency noise.
FIGURE 5. OPA343 in Noninverting Configuration Driving ADS7816.
+5V
330pF
0.1µF
0.1µF
For improved accuracy use OPA340.
5kΩ
5kΩ
VIN
1
VREF
8
V+
7
6
5
DCLOCK
DOUT
+In
2
Serial
Interface
ADS7816
12-Bit A/D
OPA343
–In
CS/SHDN
3
GND
4
VIN = 0V to –5V for 0V to 5V output.
NOTE: A/D Input = 0 to VREF
FIGURE 6. OPA343 in Inverting Configuration Driving ADS7816.
Filters 160Hz to 2.4kHz
+5V
10MΩ
VIN
243kΩ
1.74MΩ
1/2
OPA2343
200pF
1/2
OPA2343
10MΩ
47pF
RL
220pF
FIGURE 7. Speech Bandpass Filter.
<1pF (prevents gain peaking)
10MΩ
+V
λ
VO
OPA343
FIGURE 8. Transimpedance Amplifier.
10
OPA343, 2343, 4343
SBOS090A
TI [ TEXAS INSTRUMENTS ]
