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XRD8775 Datasheet(PDF) 6 Page - Exar Corporation

Part No. XRD8775
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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XRD8775 Datasheet(HTML) 6 Page - Exar Corporation

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XRD8775
6
Rev. 4.00
APPLICATION NOTES
Signals should not exceed AV
DD +0.5V or go below
AGND -0.5V or DV
DD +0.5V or DGND -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 between these
pins will cause undesirable internal substrate currents.
The power supply (AV
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 XRD8775 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.
Graph 1. DNL vs. Code
-1.0
-0.8
-0.6
-0.4
-0.2
0.0
0.2
0.4
0.6
0.8
1.0
0
32
64
96
128
160
192
224
256
Code
Vdd = 5.0V
Vrt = 2.6V
Vrb = 0.6V
Fs = 15MHz
Ta = 25
oC


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