OP1177/OP2177/OP4177
V
CC
Plugging these values into Equation 1 yields
1
R9
200kΩ
C1
2.2µF
CMRRMIN
≅
ADR293
2δ
V+
R3
47kΩ
R7
80.6kΩ
0.1µF
where δ is the tolerance of the resistors.
10µF
D1
R6
50Ω
Lower tolerance value resistors result in higher common-mode
rejection (up to the CMRR of the operational amplifier).
D1
TR
R2
10µF
R8
1kΩ
4.02kΩ
7
Cu
2
3
(–)
6
V
Using 5% tolerance resistors, the highest CMRR that can be
guaranteed is 20 dB. Alternatively, using 0.1% tolerance resistors
results in a common-mode rejection ratio of at least 54 dB
(assuming that the operational amplifier CMRR × 54 dB).
OUT
OP1177
T
V
TC
J
R5
100Ω
TR
Cu
(+)
10µF
4
10µF
R1
50Ω
R4
50Ω
ISOTHERMAL
BLOCK
0.1µF
With the CMRR of OPx177 at 120 dB minimum, the resistor
match is the limiting factor in most circuits. A trimming resistor
can be used to further improve resistor matching and CMRR of
the difference amplifier circuit.
V–
Figure 64. Type K Thermocouple Amplifier Circuit
LOW POWER LINEARIZED RTD
A common application for a single element varying bridge is an
RTD thermometer amplifier, as shown in Figure 65. The excita-
tion is delivered to the bridge by a 2.5 V reference applied at the
top of the bridge.
A HIGH ACCURACY THERMOCOUPLE AMPLIFIER
A thermocouple consists of two dissimilar metal wires placed in
contact. The dissimilar metals produce a voltage
VTC = α(TJ − TR)
RTDs may have thermal resistance as high as 0.5°C to 0.8°C
per mW. To minimize errors due to resistor drift, the current
through each leg of the bridge must be kept low. In this circuit,
the amplifier supply current flows through the bridge. However,
at the OPx177 maximum supply current of 600 ꢀA, the RTD
dissipates less than 0.1 mW of power, even at the highest resis-
tance. Errors due to power dissipation in the bridge are kept
under 0.1°C.
where:
TJ is the temperature at the measurement of the hot junction.
TR is the temperature at the cold junction.
α is the Seebeck coefficient specific to the dissimilar metals used
in the thermocouple.
V
TC is the thermocouple voltage and becomes larger with
increasing temperature.
Maximum measurement accuracy requires cold junction compen-
sation of the thermocouple. To perform the cold junction compen-
sation, apply a copper wire short across the terminating junctions
(inside the isothermal block) simulating a 0°C point. Adjust the
output voltage to zero using the R5 trimming resistor, and remove
the copper wire.
Calibration of the bridge is made at the minimum value of
temperature to be measured by adjusting RP until the output is zero.
To calibrate the output span, set the full-scale and linearity
potentiometers to midpoint and apply a 500°C temperature to
the sensor or substitute the equivalent 500°C RTD resistance.
Adjust the full-scale potentiometer for a 5 V output. Finally,
apply 250°C or the equivalent RTD resistance and adjust the
linearity potentiometer for 2.5 V output. The circuit achieves
better than 0.5°C accuracy after adjustment.
The OPx177 is an ideal amplifier for thermocouple circuits
because it has a very low offset voltage, excellent PSRR and
CMRR, and low noise at low frequencies.
It can be used to create a thermocouple circuit with great
linearity. Resistor R1, Resistor R2, and Diode D1, shown in
Figure 64, are mounted in an isothermal block.
Rev. G | Page 19 of 24
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