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AD780 Datasheet(PDF) 8 Page - Analog Devices |
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AD780 Datasheet(HTML) 8 Page - Analog Devices |
8 / 10 page AD780 REV. B –8– LINE REGULATION Line regulation is a measure of the change in output voltage due to a specified change in input voltage. It is intended to simulate worst case unregulated supply conditions and is measured in µV/V. Figure 14 shows typical performance with 4.0 V < VIN < 15.0 V. 200 –200 415 100 –100 10 0 INPUT VOLTAGE – Volts T = 25 C Figure 14. Output Voltage Change vs. Input Voltage PRECISION REFERENCE FOR HIGH RESOLUTION +5 V DATA CONVERTERS The AD780 is ideally suited to be the reference for most +5 V high resolution ADCs. The AD780 is stable under any capaci- tive load, it has superior dynamic load performance, and the 3.0 V output provides the converter with maximum dynamic range without requiring an additional and expensive buffer am- plifier. One of the many ADCs that the AD780 is suited for is the AD7884, a 16-bit, high speed sampling ADC. (See Figure 15.) This part previously needed a precision 5.0 V reference, re- sistor divider and buffer amplifier to do this function. +5V VIN VOUT GND AD780 1 F VREF +F VREF +S AD7884 2.5/3.0V SELECT Figure 15. Precision 3.0 V Reference for the AD7884 16-Bit, High Speed ADC The AD780 is also ideal for use with higher resolution convert- ers such as the AD7710/AD7711/AD7712. (See Figure 16.) While these parts are specified with a 2.5 V internal reference, the AD780 in 3 V mode can be used to improve the absolute ac- curacy, temperature stability and dynamic range. It is shown fol- lowing with the two optional noise reduction capacitors. +5V VIN VOUT GND AD780 1 F REFIN+ REFIN– AD7710 2.5/3.0V SELECT 100 F 100nF Figure 16. Precision 2.5 V or 3.0 V Reference for the AD7710 High Resolution, Sigma-Delta ADC +4.5 V REFERENCE FROM +5 V SUPPLY Some +5 V high resolution ADCs can accommodate reference voltages up to +4.5 V. The AD780 can be used to provide a precision +4.5 V reference voltage from a +5 V supply using the circuit shown following in Figure 17. This circuit will provide a regulated +4.5 V output from a supply voltage as low as +4.7 V. The high quality tantalum 10 µF capacitor in parallel with the ceramic 0.1 µF capacitor and the 3.9 Ω resistor ensure a low output impedance up to around 50 MHz. AD780 2N2907 10 F 3.9 4k 0.01% 5k 0.01% 0.1 F 0.1 F 1k VSUPPLY VOUT OP90 2.5k 0.1 F Figure 17. +4.5 V Reference from a Single +5 V Supply |
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