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AD584K Scheda tecnica(PDF) 10 Page - Analog Devices |
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AD584K Scheda tecnica(HTML) 10 Page - Analog Devices |
10 / 12 page AD584 Data Sheet Rev. C | Page 10 of 12 The AD584 is normally used in the −10 V mode with the AD7574 to give a 0 V to +10 V ADC range. This is shown in Figure 17. Bipolar output applications and other operating details can be found in the data sheets for the CMOS products. Figure 17. AD584 as −10 V Reference for CMOS ADC PRECISION DAC REFERENCE The AD565A, like many DACs, can operate with an external 10 V reference element (see Figure 19). This 10 V reference voltage is converted into a reference current of approximately 0.5 mA via the internal 19.95 kΩ resistor (in series with the external 100 Ω trimmer). The gain temperature coefficient of the AD565A is primarily governed by the temperature tracking of the 19.95 kΩ resistor and the 5 kΩ/10 kΩ span resistors; this gain temperature coefficient is guaranteed to 3 ppm/°C. Therefore, using the AD584K (at 5 ppm/°C) as the 10 V reference guarantees a maximum full- scale temperature coefficient of 18 ppm/°C more than the commercial range. The 10 V reference also supplies the normal 1 mA bipolar offset current through the 9.95 kΩ bipolar offset resistor. The bipolar offset temperature coefficient thus depends only on the temperature coefficient matching of the bipolar offset resistor to the input reference resistor and is guaranteed to 3 ppm/°C. Figure 18 demonstrates the flexibility of the AD584 applied to another popular digital-to-analog configuration. Figure 18. Current Output, 8-Bit Digital-to-Analog Configuration Figure 19. Precision 12-Bit DAC –10V REF AD584 4 1 8 –15V V+ 10.0V COMMON R3 1.2kΩ 5% 0.1µF +15V 1 18 2 3 4 5 AD7574 (TOP VIEW) SIGNAL INPUT 0V TO +10V ANALOG GROUND GROUND INTERTIE DIGITAL SUPPLY RETURN R1 2kΩ 10%* * R1 AND R2 CAN BE OMITTED IF GAIN TRIM IS NOT REQUIRED. GAIN TRIM R2 2kΩ* C A1 (MSB) 5 14 A2 6 15 A3 7 A4 8 A5 9 A6 10 A7 11 4 IO A8 (LSB) 12 COMP 16 1 VLC RL R15 R14 = R15 V+ 13 V– 3 2 AD DAC08 VREF (+) VREF (–) AD584 4 8 1 3 COMMON V+ 2.5V 10.0V R14 IOUT 0.5mA IREF DAC AD565A 5kΩ 20V SPAN 10V SPAN DAC OUT –VEE REF GND BIPOLAR OFF 5kΩ 8kΩ IO CODE INPUT LSB MSB 10V VCC REF OUT REF IN POWER GND 19.95 kΩ 20 kΩ 9.95kΩ IOUT = 4 × IREF × CODE 0.1µF 0.1µF OP1177 +15V –15V 2 3 6 OP AMP OUTPUT ±10V +15V +15V 1 4 8 AD584 R2 100 Ω 15T GAIN ADJUST R1 100 Ω 15T BIPOLAR OFFSET ADJUST –15V |
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