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REF3330AIDCKTG4 Datasheet(PDF) 9 Page - Texas Instruments |
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REF3330AIDCKTG4 Datasheet(HTML) 9 Page - Texas Instruments |
9 / 18 page www.ti.com POWER DISSIPATION APPLICATION CIRCUITS T =T +P ´ q J A D JA (2) NOISE PERFORMANCE R 3 R 2 V IN +2.7V Enable (1) OPA333, OPA363, OPA369 or R 66.5 1 W C 1.5nF 1 C 1 F 2 m P1.2 VREF A0+ REF3312 +2.7V V CC V SS 16-Bit ADC MSP430x20x3PW REF3312,, REF3318 REF3320, REF3325 REF3330, REF3333 SBOS392A – AUGUST 2007 – REVISED SEPTEMBER 2007 The REF33xx family is specified to deliver current Figure 20 shows a simple application circuit where loads of ±5mA over the specified input voltage range. low-power components are used to create a signal The temperature of the device increases according to chain. The analog input signal is buffered with either Equation 2: a zero-drift OPA333 or zero-crossover OPA363. The reference voltage created from REF3312 provides a stable, high-accuracy, low-drift reference voltage to the MSP430 using much less power than the Where: MSP430 internal reference. The reference voltage is TJ = Junction temperature (°C) used by the internal, 16-bit analog-to-digital converter TA = Ambient temperature (°C) (ADC) to accurately convert the analog input signal. PD = Power dissipation (W) The configuration in Figure 20 presents an example Where PD = VIN × IQ + (VIN – VOUT) IOUT of a unipolar signal chain. θJA = Junction-to-ambient thermal resistance An example of a bipolar configuration is illustrated in ( °C/W) Figure 21. The analog input signal (±2.5V) is offset and attenuated so that it matches the analog input of The REF33xx junction temperature must not exceed the 16-bit ADC on the MSP430. The negative input of the absolute maximum rating of +150 °C. the ADC is offset by 0.62V, creating a digital code that corresponds to the analog input voltage. In this configuration, two reference voltages are used. The Typical 0.1Hz to 10Hz voltage noise for each member REF3312 creates a 1.25V reference input to the ADC of the REF33xx family is specified in the Electrical and is an offset point for the INA159. The same Characteristics table. The noise voltage increases voltage is used to create the offset voltage to the with output voltage and operating temperature. negative input to the ADC. The REF3330 creates a Additional filtering can be used to improve output precise analog supply voltage of 3V. In this way, the noise levels. Special attention should be taken to high PSRR of the REF3330 helps to filter unwanted ensure that the output impedance does not degrade noise from the 3.3V digital supply. output voltage accuracy. (1) Enable is a function of the OPA363 not available on the OPA333. Figure 20. Unipolar Signal Chain Configuration Copyright © 2007, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Link(s): REF3312 REF3318 REF3320 REF3325 REF3330 REF3333 |
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