OP1177_07 Datasheet, PDF (19/24 Pages) Analog Devices – Precision Low Noise, Low Input Bias Current Operational Amplifiers

Plugging these values into Equation 1 yields
CMRR_MIN ≅
1
2δ
where δ is the tolerance of the resistors.
Lower tolerance value resistors result in higher common-mode
rejection (up to the CMRR of the operational amplifier).
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).
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.
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)
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.
VTC 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.
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.
OP1177/OP2177/OP4177
V_CC
C1
2.2µF
ADR293
R3
47kΩ
R7
80.6kΩ
R9
200kΩ
V+
0.1µF
D1
(–)
T_J V_TC
(+)
10µF
D1
R2
4.02kΩ
TR
Cu
R6
R8
50Ω
1kΩ
TR
Cu
R5
100Ω
10µF
R1
R4
50Ω
50Ω
10µF
7
2
6
OP1177
3
4 ^10µF
ISOTHERMAL
BLOCK
0.1µF
V–
Figure 64. Type K Thermocouple Amplifier Circuit
V_OUT
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.
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 μA, 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.
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.
Rev. E | Page 19 of 24