OPA378_1 Datasheet, PDF (15/24 Pages) Texas Instruments – Low-Noise, 900kHz, RRIO, Precision OPERATIONAL AMPLIFIER Zerø-Drift Series

OPA378
OPA2378
www.ti.com ..................................................................................................................................................... SBOS417C – JANUARY 2008 – REVISED JUNE 2009
R₁
100kW
RA
R₂
100kW
LL
R₃
100kW
LA
+V_S
1/2
OPA2378
+V_S
1/2
OPA2378
+V_S
1/2
OPA2378
C₁
47pF
R₆
100kW
R₇
100kW
R₈
100kW
Wilson
V_CENTRAL
(RA + LA + LL)/3
R₅
390kW
R₄
100kW
RL
+V_S
1/2
OPA2378
Inverted
V_CM
R₉
20kW
+V_S
1/2
OPA2378
+V_S
C₂
0.64mF
R₁₀
1MW
1/2 V_S
R₁₁
1MW
f_O = 0.5Hz
f_LPF = 150Hz
C₄
1.06nF
G_TOT = 1kV/V
+VS
3
7 ^{GINA = 5}
6
2
INA321⁽¹⁾
1
4
5
C₃
1mF
dc
ac
+V_S
R₁₂
5kW
R₁₃
318kW
1/2
OPA2378
R₁₄
1MW
+V_S
OPA378
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
(1) Other instrumentation amplifiers can be used, such as the INA326, which has lower noise but higher quiescent current.
Figure 36. Single-Supply, Very Low Power, ECG Circuit
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