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REF3240AIDBVR Datasheet(PDF) 9 Page - Burr-Brown (TI) |
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REF3240AIDBVR Datasheet(HTML) 9 Page - Burr-Brown (TI) |
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9 / 15 page  REF3212,REF3220 REF3225,REF3230 REF3233,REF3240 SBVS058B −JUNE 2005 − REVISED FEBRUARY 2006 www.ti.com 9 The REF32xx also features a low quiescent current of 100 µA, with a maximum quiescent current over temperature of just 135 µA. The quiescent current typically changes less than 2 µA over the entire supply range, as shown in Figure 3. 110 108 106 104 102 100 98 96 94 1.5 2.0 3.0 4.0 2.5 3.5 4.5 6.0 5.0 5.5 Power Supply (V) Figure 3. Supply Current vs Supply Voltage Supply voltages below the specified levels can cause the REF32xx to momentarily draw currents greater than the typical quiescent current. This momentary current draw can be prevented by using a power supply with a fast rising edge and low output impedance. SHUTDOWN The REF32xx can be placed in a low-power mode by pulling the ENABLE/SHUTDOWN pin low. When in Shutdown mode, the output of the REF32xx becomes a resistive load to ground. The value of the load depends on the model, and ranges from approximately 100k Ω to 400k Ω. THERMAL HYSTERESIS Thermal hysteresis for the REF32xx is defined as the change in output voltage after operating the device at +25 _C, cycling the device through the specified temperature range, and returning to +25 _C. It can be expressed as: V HYST + V PRE * V POST V NOM 106(ppm) Where: VHYST = thermal hysteresis (in units of ppm). VNOM = the specified output voltage. VPRE = output voltage measured at +25_C pretemperature cycling. VPOST = output voltage measured after the device has been cycled through the specified temperature range of –40 _C to +125_C and returned to +25_C. TEMPERATURE DRIFT The REF32xx is designed to exhibit minimal drift error, which is defined as the change in output voltage over varying temperature. The drift is calculated using the box method, as described by the following equation: Drift + V OUTMAX * VOUTMIN V OUT Temp Range 106(ppm) The REF32xx features a typical drift coefficient of 4ppm/ °C from 0 _C to +125_C—the primary temperature range for many applications. For the extended industrial temperature range of –40 _C to +125_C, the REF32xx family drift increases to a typical value of 10.5ppm/ °C. NOISE PERFORMANCE Typical 0.1Hz to 10Hz voltage noise can be seen in the Typical Characteristic curve, 0.1 to 10Hz Voltage Noise. The noise voltage of the REF32xx increases with output voltage and operating temperature. Additional filtering can be used to improve output noise levels, although care should be taken to ensure the output impedance does not degrade AC performance. (1) (2) |
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