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OPA333A-EP_09 Datasheet, PDF (12/19 Pages) Texas Instruments – 1.8-V MICROPOWER CMOS OPERATIONAL AMPLIFIERS ZERO-DRIFT SERIES | |||
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OPA333A-EP, OPA2333A-EP
SGLS383B â APRIL 2007 â REVISED JUNE 2008 ............................................................................................................................................................ www.ti.com
1 Mâ¦
3V
1 Mâ¦
60 kâ¦
100 kâ¦
NTC
Thermistor OPA333
Figure 7. Thermistor Measurement
V1
âIn
OPA333
INA152
2
5
R2
R1
R2
6
VO
3
1
OPA333
V2
+In
VO = (1 + 2R2/R1) (V2 â V1)
Figure 8. Precision Instrumentation Amplifier
R1
100kâ¦
RA
R2
100kâ¦
LL
R3
100kâ¦
LA
+VS
1/2
OPA2333
+VS
1/2
OPA2333
+VS
1/2
OPA2333
C1
47pF
R6
100kâ¦
R7
100kâ¦
R8
100kâ¦
Wilson
VCENTRAL
(RA + LA + LL)/3
R5
390kâ¦
R4
100kâ¦
RL
+VS
1/2
OPA2333
Inverted
VCM
R9
20kâ¦
+VS
1/2
OPA2333
+VS
C2
0.64µF
R10
1Mâ¦
1/2 VS
R11
1Mâ¦
fO = 0.5Hz
fLPF = 150Hz
C4
1.06nF
GTOT = 1kV/V
+VS
3
7 GINA = 5
6
2
INA321(1)
1
4
5
C3
1µF
R12
5kâ¦
R13
318kâ¦
dc
ac
+VS
1/2
OPA2333
R14
1Mâ¦
+VS
OPA333
VOUT
GOPA = 200
fHPF = 0.5Hz
(provides ac signal coupling)
1/2 VS
VS = +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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Product Folder Link(s): OPA333A-EP OPA2333A-EP
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