OPA333-Q1_15 Datasheet, PDF (12/19 Pages) Texas Instruments – 1.8-V MICROPOWER CMOS OPERATIONAL AMPLIFIER ZERO-DRIFT SERIES

OPA333-Q1
SBOS522 – JUNE 2010
1 MΩ
3V
1 MΩ
60 kΩ
100 kΩ
NTC
Thermistor ^OPA333
Figure 7. Thermistor Measurement
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V₁
−In
OPA333
INA152
2
5
R₂
R₁
R₂
6
V_O
3
1
OPA333
V₂
+In
V_O = (1 + 2R₂/R₁) (V₂ − V₁)
Figure 8. Precision Instrumentation Amplifier
R₁
100kΩ
RA
R₂
100kΩ
LL
R₃
100kΩ
LA
+V_S
1/2
OPA2333
+V_S
1/2
OPA2333
+V_S
1/2
OPA2333
C₁
47pF
R₆
100kΩ
R₇
100kΩ
R₈
100kΩ
Wilson
V_CENTRAL
(RA + LA + LL)/3
R₅
390kΩ
R₄
100kΩ
RL
+V_S
1/2
OPA2333
Inverted
V_CM
R₉
20kΩ
+V_S
1/2
OPA2333
+V_S
C₂
0.64µF
R₁₀
1MΩ
1/2 V_S
R₁₁
1MΩ
f_O = 0.5Hz
f_LPF = 150Hz
C₄
1.06nF
G_TOT = 1kV/V
+V_S
3
7 ^{GINA = 5}
6
2
INA321⁽¹⁾
1
4
5
C₃
1µF
R₁₂
5kΩ
R₁₃
318kΩ
dc
ac
+V_S
1/2
OPA2333
R₁₄
1MΩ
+V_S
OPA333
V_OUT
G_OPA = 200
f_HPF = 0.5Hz
(provides ac signal coupling)
1/2 V_S
V_S = +2.7V to +5.5V
BW = 0.5Hz to 150Hz
NOTE: (1) Other instrumentation amplifiers can be used,
such as the INA326, which has lower noise,
but higher quiescent current.
Figure 9. Single-Supply, Very-Low-Power ECG Circuit
12
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