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XRD8785 Datasheet(PDF) 6 Page - Exar Corporation

Part No. XRD8785
Description  CMOS 8-Bit High Speed Analog-to-Digital Converter
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Maker  EXAR [Exar Corporation]
Homepage  http://www.exar.com
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XRD8785 Datasheet(HTML) 6 Page - Exar Corporation

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XRD8785
6
Rev. 3.00
Figure 5. Equivalent Input Circuit
Figure 6. Typical Circuit Connections
APPLICATION NOTES
Signals should not exceed V
DD +0.5V or go below GND
–0.5V. All pins have internal protection diodes that will
protect them from short transients (<100
µs) outside
the supply range.
AGND and DGND pins are connected internally
through the P-substrate. DC voltage differences be-
tween GND pins will cause undesirable internal sub-
strate currents.
The power supply (V
DD) and reference voltage (VRT &
V
RB) pins should be decoupled with 0.1µF and 10µF
capacitors to AGND, placed as close to the chip as
possible.
The digital outputs should not drive long wires or buses.
The capacitive coupling and reflections will contribute
noise to the conversion.
To avoid timing errors, use the rising edge of the sample
clock (CLK) to latch data from the XRD8785 to other
parts of the system.
The reference can be biased internally by shorting V
RT
to V
RTS and VRB to VRBS. This will generate 0.6V at VRB
and 2.6V at V
RT (see Figure 5).
If the internal reference pins V
RTS and/or VRBS are not
used, they should be left unconnected.
The output enable pin (OE) should not be left uncon-
nected. If not controlled by an active signal then it must
be tied to a logic low value.


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