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ADA4800 Datasheet(PDF) 11 Page - Analog Devices |
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ADA4800 Datasheet(HTML) 11 Page - Analog Devices |
11 / 16 page ADA4800 Rev. A | Page 11 of 16 APPLICATIONS INFORMATION OPEN SOURCE CCD OUTPUT BUFFER With low power, high slew rate, and fast settling time, the ADA4800 is the ideal solution for an output buffer for CCD sensors with an open source output configuration. Figure 21 shows a typical application circuit for the ADA4800 as a CCD sensor output buffer. The output of the CCD is connected directly to the IN pin of the ADA4800, whose OUT pin is then ac-coupled into the input of the analog front end. IN VEE OUT CCD AFE 15V ADA4800 IAL IBUFF +1 IIDRV IISF 6 ISF 1 5 VCC 2 4 IDRV 3 RISF 120k Ω 15V VISF RIDRV 249k Ω 0.1µF 0.1µF 0.1µF 47µF + Figure 21. Typical Application Block Diagram To help reduce the effects of power supply noise coupling into the ISF and IDRV pins, use 0.1 μF ceramic bypass decoupling capacitors. For best performance, place these capacitors as close to each of these pins as is physically possible. POWER SAVE MODE The buffer of the ADA4800 consumes only 20 mW of static power. To achieve even more power savings, the ADA4800 active load current can be switched off during standby mode or reduced during monitoring mode. Figure 22 illustrates the ADA4800 as an open source CCD buffer configured for using this power save feature. Power save mode allows IAL current to be logically controlled by connecting the ISF pin to any general- purpose output (GPO) pin of the system microcontroller through an external resistor. A GPO logic high enables the flow of input sink current, while a logic low disables the input sink current and asserts the power save mode. 0V TO 3V GPO PIN IN VEE OUT CCD AFE 15V ADA4800 IAL IBUFF +1 IIDRV IISF 6 ISF 1 5 VCC 2 4 IDRV 3 RISF 10k Ω VISF RIDRV 249k Ω 0.1µF 0.1µF 0.1µF 47µF + Figure 22. Using GPO to Drive ISF Voltage Figure 23 shows an example of the ADA4800 power save feature. AFE GPO1 GPO2 20k Ω 20k Ω MAIN BOARD FPC ADA4800 ISF Figure 23. Example Block Diagram for Sink Current Selection Three combinations of IAL are provided with Figure 23. Selection of the IAL is controlled by the logic signals applied to the GPO1 and GPO2 pins. Table 5 summarizes the IAL selections. Table 5. Input Sink Current Selection Mode GPO1 GPO2 Resistance (kΩ) Active Load Current, IAL (mA) Standby High-Z High-Z High-Z 0 0 0 N/A Sleep High-Z 1 20 1.90 1 High-Z 20 Active 1 1 10 3.36 |
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Descripción similar - ADA4800 |
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