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REF5020AIDG4 Datasheet(PDF) 11 Page - Texas Instruments |
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REF5020AIDG4 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 28 page Drift + V OUTMAX * VOUTMIN V OUT Temp Range 106(ppm) DNC TEMP V OUT V IN GND DNC NC TRIM/NR REF50xx V TEMP 2.6mV/ C ° OPA(1) NOTE:(1)Lowdriftopamp,suchastheOPA333,OPA335,orOPA376. +V V = HYST · 10 (ppm) 6 ( ( |V V | V PRE POST NOM - REF5010, REF5020 REF5025, REF5030 REF5040, REF5045, REF5050 www.ti.com SBOS410E – JUNE 2007 – REVISED JUNE 2010 TEMPERATURE DRIFT To avoid errors caused by low-impedance loading, buffer the TEMP pin output with a suitable The REF50xx is designed for minimal drift error, low-temperature drift op amp, such as the OPA333, which is defined as the change in output voltage over OPA335, or OPA376, as shown in Figure 32. temperature. The drift is calculated using the box method, as described by the following equation: (1) The REF50xx features a maximum drift coefficient of 3ppm/°C for the high-grade version, and 8ppm/°C for the standard-grade. space THERMAL HYSTERESIS Thermal hysteresis for the REF50xx is defined as the Figure 32. Buffering the TEMP Pin Output change in output voltage after operating the device at +25°C, cycling the device through the specified POWER DISSIPATION temperature range, and returning to +25°C. It can be expressed as Equation 2: The REF50xx family is specified to deliver current loads of ±10mA over the specified input voltage range. The temperature of the device increases according to the equation: (2) TJ = TA + PD × qJA (3) Where: Where: VHYST = thermal hysteresis (in units of ppm). TJ = Junction temperature (°C) VNOM = the specified output voltage. TA = Ambient temperature (°C) VPRE = output voltage measured at +25°C PD = Power dissipated (W) pretemperature cycling. qJA = Junction-to-ambient thermal resistance VPOST = output voltage measured after the device (°C/W) has been cycled from +25°C through the specified temperature range of –40°C to +125°C The REF50xx junction temperature must not exceed and returned to +25°C. the absolute maximum rating of +150°C. TEMPERATURE MONITORING NOISE PERFORMANCE The temperature output terminal (TEMP, pin 3) Typical 0.1Hz to 10Hz voltage noise for each member provides a temperature-dependent voltage output of the REF50xx family is specified in the Electrical with approximately 60k Ω source impedance. As seen Characteristics: Per Device table. The noise voltage in Figure 8, the output voltage follows the nominal increases with output voltage and operating relationship: temperature. Additional filtering can be used to improve output noise levels, although care should be VTEMP PIN = 509mV + 2.64 × T(°C) taken to ensure the output impedance does not This pin indicates general chip temperature, accurate degrade performance. to approximately ±15°C. Although it is not generally For additional information about how to minimize suitable for accurate temperature measurements, it noise and maximize performance in mixed-signal can be used to indicate temperature changes or for applications such as data converters, refer to the temperature compensation of analog circuitry. A series of Analog Applications Journal articles entitled, temperature change of 30°C corresponds to an How a Voltage Reference Affects ADC Performance. approximate 79mV change in voltage at the TEMP This three-part series is available for download from pin. the TI website under three literature numbers: The TEMP pin has high output impedance (see SLYT331, SLYT339, and SLYT355 for Part I, Part II, Figure 28). Loading this pin with a low-impedance and Part III, respectively. circuit induces a measurement error; however, it does not have any effect on VOUT accuracy. Copyright © 2007–2010, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Link(s): REF5010 REF5020 REF5025 REF5030 REF5040 REF5045 REF5050 |
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