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ADS8506IBDW Datenblatt(PDF) 26 Page - Texas Instruments

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Teilenummer ADS8506IBDW
Bauteilbeschribung  12-BIT 40-KSPS LOW POWER SAMPLING ANALOG-TO-DIGITAL CONVERTER WITH INTERNAL REFERENCE AND PARALLEL/SERIAL INTERFACE
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GROUNDING
SIGNAL CONDITIONING
INTERMEDIATE LATCHES
ADS8506
SLAS484B – SEPTEMBER 2007 – REVISED DECEMBER 2007
from the digital logic. For best performance, the +5-V supply can be produced from whatever analog supply is
used for the rest of the analog signal conditioning. If +12-V or +15-V supplies are present, a simple +5-V
regulator can be used. Although it is not suggested, if the digital supply must be used to power the converter, be
sure to properly filter the supply. Either using a filtered digital supply or a regulated analog supply, both VDIG and
VANA should be tied to the same +5-V source.
Three ground pins are present on the ADS8506. DGND is the digital supply ground. AGND2 is the analog supply
ground. AGND1 is the ground to which all analog signals internal to the A/D converter are referenced. AGND1 is
more susceptible to current induced voltage drops and must have the path of least resistance back to the power
supply.
All the ground pins of the A/D converter should be tied to an analog ground plane, separated from the system's
digital logic ground, to achieve optimum performance. Both analog and digital ground planes should be tied to
the system ground as near to the power supplies as possible. This helps to prevent dynamic digital ground
currents from modulating the analog ground through a common impedance to power ground.
The FET switches used for the sample hold on many CMOS A/D converters release a significant amount of
charge injection which can cause the driving op amp to oscillate. The amount of charge injection due to the
sampling FET switch on the ADS8506 is approximately 5% to 10% of the amount on similar A/D converters with
the charge redistribution digital-to-analog converter (DAC) CDAC architecture. There is also a resistive front end
which attenuates any charge which is released. The end result is a minimal requirement for the drive capability
on the signal conditioning preceding the A/D converter. Any op amp sufficient for the signal in an application will
be sufficient to drive the ADS8506.
The resistive front end of the ADS8506 also provides a specified ±25-V overvoltage protection. In most cases,
this eliminates the need for external over-voltage protection circuitry.
The ADS8506 does have 3-state outputs for the parallel port, but intermediate latches should be used if the bus
is active during conversions. If the bus is not active during conversion, the 3-state outputs can be used to isolate
the A/D converter from other peripherals on the same bus.
Intermediate latches are beneficial on any monolithic A/D converter. The ADS8506 has an internal LSB size of
38
µV. Transients from fast switching signals on the parallel port, even when the A/D converter is 3-stated, can
be coupled through the substrate to the analog circuitry causing degradation of converter performance.
26
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Copyright © 2007, Texas Instruments Incorporated
Product Folder Link(s): ADS8506


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