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AD780AR Folha de dados(PDF) 10 Page - Analog Devices |
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AD780AR Folha de dados(HTML) 10 Page - Analog Devices |
10 / 12 page AD780 Data Sheet Rev. F | Page 10 of 12 +VIN AD780 AD7884 VOUT VREF + F 6 VREF + S 2.5V/3.0V SELECT 8 GND 4 2 1 F 5V Figure 21. Precision 3 V Reference for the AD7884 16-Bit, High Speed ADC The AD780 is also ideal for use with higher resolution converters, such as the AD7710/AD7711/AD7712 (see Figure 22. 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 accuracy, temperature stability, and dynamic range. It is shown in Figure 22 with the two optional noise reduction capacitors. +VIN AD780 AD7710 VOUT REF IN+ 6 2.5V/3.0V O/P SELECT 8 GND 4 3 2 1 F 100nF 5V REF IN– 100 F Figure 22. Precision 2.5 V or 3.0 V Reference for the AD7710 High Resolution, Σ-Δ 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 in Figure 23. This circuit provides 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 AD780 0.1 μF capacitor and the 3.9 Ω resistor, ensures a low output impedance around 50 MHz. AD780 2N2907 VOUT 5k 0.01% 4k 0.01% 2.5k 3.9 1k 0.1 F 0.1 F 10 F 0.1 F OP90 + – VSUPPLY 2 4 6 3 7 6 4 2 Figure 23. 4.5 V Reference from a Single 5 V Supply NEGATIVE (–2.5 V) REFERENCE The AD780 can produce a negative output voltage in shunt mode by connecting the input and output to ground, and connecting the AD780’s GND pin to a negative supply via a bias resistor, as shown in Figure 25. NC TEMP +VIN VOUT TRIM GND O/P SELECT 2.5V – NC 3.0V – GND NC 1 F AD780 NOTES 1. IL = LOAD CURRENT 2. IS MIN = MINIMUM SHUNT CURRENT 3. NC = NO CONNECT 1 7 6 5 8 4 2 3 R = VOUT – (V–) IL + IS MIN –2.5 VOUT V– Figure 24. Negative (−2.5 V Shunt Mode Reference) A precise –2.5 V reference capable of supplying up to 100 mA to a load can be implemented with the AD780 in series mode, using the bootstrap circuit shown in Figure 25. AD780 2N3906 +5V +5V OP07 CONNECT IF –3V OUTPUT DESIRED –2.5V (IL 100mA) –5V –5V OUT 1k 1000pF +VIN – + 2 4 68 Figure 25. −2.5 V High Load Current Reference |
Nº de peça semelhante - AD780AR |
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Descrição semelhante - AD780AR |
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