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INA330AIDGST Datasheet(PDF) 8 Page - Texas Instruments |
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INA330AIDGST Datasheet(HTML) 8 Page - Texas Instruments |
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8 / 19 page  INA330 8 SBOS260 www.ti.com INA330 PIN 5 Pin 5 of the INA330 should be connected to V+ to ensure proper operation. COMPLETE TEMPERATURE CONTROLLER See Figure 6 for a complete temperature control loop with a TEC (thermoelectric cooler) for cooling and heating. PID (proportional, integral, differential) control circuitry is shown for loop compensation and stability. The loop controls temperature to an adjustable set-point of 22.5 °C to 27.5°C. The nominal 10kΩ at 25°C thermistor ranges from approximately 11.4k Ω to 8.7kΩ over this range. A 1V excitation voltage is applied to V1 and V2, producing a nominal 100 µA current in the 10kΩ R SET resistor. The ther- The INA330 is designed and tested for amplifying 10k Ω thermistor signals used in the control of thermoelectric coolers for optical networking applications. The simplified schematic in Figure 5 shows the basic function of the INA330. An excitation voltage is applied as V1 and V2. Typically, these voltages are equal. They generate cur- rents I1 and I2 in the thermistor and RSET resistor. Auto-corrected current mirror circuitry around A1 and A2 produce an output current, IO, equal to the difference A1 V+ Enable Current Mirror Current Mirror I 2 I 2 I 2 R SET R THERM R G C FILTER V O V 2 V 1 I 2 I O I 1 – I2 I O = I1 – I2 I O A3 A2 V ADJUST Current Mirror Current Mirror 95 6 8 7 4 3 10 1 2 INA330 I 1 current I1 – I2. The gain is set by the value of RG. The output voltage, VO, is the voltage resulting from IO flowing through RG. The INA330 uses internal charge pumps to create volt- ages beyond the power-supply rails. As a result, the voltage on RG can actually swing 20mV below the nega- tive power-supply rail, and 100mV beyond the positive supply rail. An internal oscillator has a frequency of 90kHz and accuracy of ±20%. INSIDE THE INA330 FIGURE 5. INA330 Simplified Schematic. mistor current is approximately 100 µA at 25°C, but will vary above or below this value over the ±2.5°C set-point tempera- ture range. The difference of these two currents flows in the gain-set resistor, RG. This produces a voltage output of approximately 0.9V/ °C. The set-point temperature is adjusted with VADJ. Thus, the voltage at VO is the sum of (IO)(RG) + VADJ. VADJ can be manually adjusted or set with a Digital-to-Analog (D/A) con- verter. Optionally, set-point temperature can be adjusted by choosing a different fixed value resistor more closely ap- proximating the value of RTHERM at the desired temperature. The noninverting input of the integrator in the PID compen- sation is connected to VBIAS. Thus, the feedback loop will drive the heating or cooling of the TEC to force VO to equal VBIAS. VADJ = 2.5V will produce a set-point temperature of |
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