OPA333_17 Datasheet, PDF (22/42 Pages) Texas Instruments – 1.8-V, microPower, CMOS Operational Amplifiers, Zero-Drift Series

OPA333, OPA2333
SBOS351E – MARCH 2006 – REVISED DECEMBER 2015
www.ti.com
R₁
100 kW
RA
R₂
100 kW
LL
R₃
100 kW
LA
+V_S
1/2
OPA2333
+V_S
1/2
OPA2333
+V_S
1/2
OPA2333
C₁
47 pF
R₆
100 kW
R₇
100 kW
R₈
100 kW
Wilson
V_CENTRAL
(RA + LA + LL) / 3
R₅
390 kW
R₄
100 kW
RL
+V_S
1/2
OPA2333
Inverted
V_CM
R₉
20 kW
+V_S
1/2
OPA2333
+V_S
C₂
0.64 mF
R₁₀
1 MW
1/2 V_S
R₁₁
1 MW
f_LPF = 150 Hz
C₄
1.06 nF
G_TOT = 1 kV/V
+VS
3
7 ^{GINA = 5}
6
INA321⁽¹⁾
2
1
4
5
C₃
1 mF
dc
ac
+V_S
R₁₂
5 kW
R₁₃
318 kW
1/2
OPA2333
R₁₄
1 MW
+V_S
OPA333
V_OUT
G_OPA = 200
f_HPF = 0.5 Hz
(provides ac signal coupling)
1/2 V_S
V_S = +2.7 V to +5.5 V
BW = 0.5 Hz to 150 Hz
f_O = 0.5 Hz
(1) Other instrumentation amplifiers can be used, such as the INA326, which has lower noise, but higher quiescent
current.
Figure 33. Single-Supply, Very Low Power, ECG Circuit
9 Power Supply Recommendations
The OPAx333 is specified for operation from 1.8 V to 5.5 V (±0.9 V to ±2.75 V); many specifications apply from
–40°C to 125°C. The Typical Characteristics presents parameters that can exhibit significant variance with regard
to operating voltage or temperature.
CAUTION
Supply voltages larger than 7 V can permanently damage the device (see the Absolute
Maximum Ratings).
TI recommends placing 0.1-μF bypass capacitors close to the power-supply pins to reduce errors coupling in
from noisy or high-impedance power supplies. For more detailed information on bypass capacitor placement,
refer to the Layout section.
22
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