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AD7367BRUZ Datasheet(PDF) 18 Page - Analog Devices |
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AD7367BRUZ Datasheet(HTML) 18 Page - Analog Devices |
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18 / 28 page  AD7366/AD7367 Rev. 0 | Page 18 of 28 Unlike other bipolar ADCs, the AD7366/AD7367 do not have a resistive analog input structure. On the AD73667/AD7366, the bipolar analog signal is sampled directly onto the sampling capacitor. This gives the AD7366/AD7367 high analog input impedance. The analog input impedance can be calculated from the following formula: Z = 1/(fS × CS) where: fS is the sampling frequency. CS is the sampling capacitor value. CS depends on the analog input range chosen (see the Analog Inputs section). When operating at 1 MSPS, the analog input impedance is typically 260 kΩ for the ±10 V range. As the sampling frequency is reduced, the analog input impedance further increases. As the analog input impedance increases, the current required to drive the analog input therefore decreases (see Figure 7 for more information). TYPICAL CONNECTION DIAGRAM Figure 20 shows a typical connection diagram for the AD7366/ AD7367. In this configuration, the AGND pin is connected to the analog ground plane of the system, and the DGND pin is connected to the digital ground plane of the system. The analog inputs on the AD7366/AD7367 accept bipolar single- ended signals. The AD7366/AD7367 can operate with either an internal or an external reference. In Figure 20, the AD7366/ AD7367 is configured to operate with the internal 2.5 V reference. A 680 nF decoupling capacitor is required when operating with the internal reference. The AVDD and DVDD pins are connected to a 5 V supply voltage. The VDD and VSS are the dual supplies for the high voltage analog input structures. The voltage on these pins must be equal to or greater than ±11.5 V (see Table 8 for more information). The VDRIVE pin is connected to the supply voltage of the micro- processor. The voltage applied to the VDRIVE input controls the voltage of the serial interface. VDRIVE can be set to 3 V or 5 V. AD7366/ AD7367 CS VDRIVE 10µF 0.1µF ++ +3V OR +5V SUPPLY +11.5V TO +16.5V SUPPLY –16.5V TO –11.5V SUPPLY +5V SUPPLY DVCC AVCC BUSY CNVST REFSEL VDRIVE DCAPA DCAPB ADDR ANALOG INPUTS ±10V, ±5V, AND 0V TO +10V 680nF 680nF SCLK DOUTA DOUTB DGND AGND VSS VB1 VB2 VA1 VDD VA2 10µF 0.1µF + + 0.1µF + 10µF + 0.1µF + SERIAL INTERFACE 10µF + 0.1µF + + + Figure 20. Typical Connection Diagram Using Internal Reference |
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