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REF5040AID Datasheet(PDF) 10 Page - Burr-Brown (TI) |
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REF5040AID Datasheet(HTML) 10 Page - Burr-Brown (TI) |
10 / 18 page www.ti.com TEMPERATURE MONITORING POWER DISSIPATION NOISE PERFORMANCE DNC TEMP V OUT V IN GND DNC NC TRIM REF50xx V TEMP 2.6mV/ C ° OPA(1) NOTE:(1)Lowdriftopamp,suchastheOPA333,OPA335,orOPA376. +V REF5020,, REF5025 REF5030, REF5040 REF5045, REF5050 SBOS410 – JUNE 2007 The temperature output terminal (TEMP, pin 3) The REF50xx family is specified to deliver current provides a temperature-dependent voltage output loads of ±10mA over the specified input voltage with approximately 60k Ω source impedance. As seen range. The temperature of the device increases in Figure 8, the output voltage follows the nominal according to the equation: relationship: TJ = TA + PD × θJA VTEMP PIN = 509mV + 2.64 × T(°C) Where: TJ = Junction temperature (°C) This pin indicates general chip temperature, accurate to approximately ±15 °C. Although it is not generally TA = Ambient temperature (°C) suitable for accurate temperature measurements, it PD = Power dissipated (W) can be used to indicate temperature changes or for θJA = Junction-to-ambient thermal resistance temperature compensation of analog circuitry. A ( °C/W) temperature change of 30 °C corresponds to an approximate 79mV change in voltage at the TEMP The REF50xx junction temperature must not exceed pin. the absolute maximum rating of +150 °C. The TEMP pin has high output impedance (see Figure 21). Loading this pin with a low-impedance circuit induces a measurement error; however, it does Typical 0.1Hz to 10Hz voltage noise for each member not have any effect on VOUT accuracy. To avoid of the REF50xx family is specified in the Electrical errors caused by low-impedance loading, buffer the Characteristics: Per Device table. The noise voltage TEMP pin output with a suitable low-temperature drift increases with output voltage and operating op amp, such as the OPA333, OPA335, or OPA376, temperature. Additional filtering can be used to as shown in Figure 24. improve output noise levels, although care should be taken to ensure the output impedance does not degrade performance. Figure 24. Buffering the TEMP Pin Output 10 Copyright © 2007, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Link(s): REF5020 REF5025 REF5030 REF5040 REF5045 REF5050 |
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