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ADS7887 Datasheet(PDF) 11 Page - Texas Instruments |
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ADS7887 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 17 page APPLICATION INFORMATION 50 W 50 W 20 pF 20 W 7 pF VDD IN GND Driving the VIN and VDD Pins VDD VIN GND CS SDO SCLK 10 nF 1 mF VDD VDD VIN GND CS SDO SCLK 10nF 1 mF GND IN OUT 3V/5V 1mF 5V/7V REF5030/REF5050 ADS7883 www.ti.com ....................................................................................................................................................................................................... SLAS594 – JULY 2008 Figure 24. Typical Equivalent Sampling Circuit The VIN input to the ADS7883 should be driven with a low impedance source. In most cases additional buffers are not required. In cases where the source impedance exceeds 200 Ω, using a buffer would help achieve the rated performance of the converter. The THS4031 is a good choice for the driver amplifier buffer. The reference voltage for the ADS7883 A/D converter is derived from the supply voltage internally. The device offers limited low-pass filtering functionality on-chip. The supply to these converters should be driven with a low impedance source and should be decoupled to the ground. A 1-µF storage capacitor and a 10-nF decoupling capacitor should be placed close to the device. Wide, low impedance traces should be used to connect the capacitor to the pins of the device. The ADS7883 draws very little current from the supply lines. The supply line can be driven by either: • Directly from the system supply. • A reference output from a low drift and low drop out reference voltage generator like the REF5030 or REF5050. The ADS7883 can operate with a wide range of supply voltages. The actual choice of the reference voltage generator depends upon the system. Figure 26 shows one possible application circuit. • A low-pass filtered version of the system supply followed by a buffer like the zero-drift OPA735 can also be used in cases where the system power supply is noisy. Care should be taken to ensure that the voltage at the VDD input does not exceed 7 V (especially during power up) to avoid damage to the converter. This can be done easily using single supply CMOS amplifiers like the OPA735. Figure 27 shows one possible application circuit. Figure 25. Supply/Reference Decoupling Capacitors Figure 26. Using the REF5030/REF5050 Reference Copyright © 2008, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Link(s): ADS7883 |
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