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INA330AIDGSR Datasheet(PDF) 6 Page - Burr-Brown (TI) |
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INA330AIDGSR Datasheet(HTML) 6 Page - Burr-Brown (TI) |
6 / 12 page INA330 6 SBOS260 www.ti.com APPLICATIONS INFORMATION OVERVIEW Precision temperature controllers are generally adjusted to their set-point temperature to achieve the desired system performance and to compensate for tolerance of the ther- mistor and reference circuitry. After this adjustment, the crucial issue is the stability of this set-point temperature. When used in a temperature control loop (Figure 1), the INA330 provides excellent control-point stability over time and ambient temperature changes. Low 1/f noise assures excellent short-term stability. Internal auto-zero circuitry as- sures excellent stability throughout product life. SOURCES OF ERRORS The largest source of error in a control system will occur due to RSET, see “Selecting Components” section. The INA330 errors are extremely low. The primary errors in the INA330 occur in the current conveyer circuitry, as shown in Figure 2. Equal currents in RSET and RTHERM produce a small output current error of 200nA (maximum), and some variation with temperature of 40nA (maximum). The offset is calibrated out. Only the variation affects set-point stability. The variation can be referred to the input as a set-point temp variation: 10k Ω thermistor with a 4.5% temperature coeffi- cient, ( α = –0.045) changes resistance by 450Ω/°C. This results in 4500nA change in I1 for a 1°C temperature change at the thermistor. Therefore, the 40nA maximum current offset error variation with ambient temperature results in a 0.009 °C variation in set-point temperature over –40°C to +85 °C ambient (40nA/4500nA/°C = 0.009°C set-point/°C FIGURE 2. Current Conveyor Portion of the INA330. 8 7 I O = I1 – I2 + IERROR + ∆IERROR /∆T Current Conveyor: measures the current difference between pins 10 and 1. 2 3 10 1 R THERM 10k Ω at 25°C 9.55k Ω at 26°C ∆I = 4500nA R SET I 2 I 1 1V D/A Converter 2 3 10 1 95 4 V+ V 2 V EXCITE 1V V 1 6 Enable High = On Low = Off 8 +0.9V/ °C for increasing temperature. 7 I 1 I 2 R SET 10k Ω (Selection of R SET significantly affects control system—see “Selecting Components” section.) R G 200k Ω Thermistor R THERM = 10kΩ C FILTER 500pF I O = I1 – I2 V O V REF 2.5V PID CONTROLLER V ADJUST = +2.5V TEC Power Amp 0.1 µF Place 0.1 µF capacitor close to and across the power- supply pins. FIGURE 1. The INA330 In Simplified Temperature Control Loop. ambient). This is the variation in set-point temperature due to variation in ambient temperature of the INA330. Insignificant Errors Input offset voltage of the voltage excitation buffers are auto- zeroed to approximately 60 µV and match to 30µV. Drift with temperature is very low. They contribute negligible error. Voltage excitation buffers have an input bias current of 0.2nA. With a source impedance of less than 10k Ω, errors produced by the input bias current will be negligible. Output buffer errors are auto-zeroed. When referred to the input, their errors are negligible. Gain error does not produce any significant temperature set- point error when used in a temperature set-point control loop. |
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