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ADS807 Datasheet(PDF) 15 Page - Texas Instruments

Part No. ADS807
Description  12-Bit, 53MHz Sampling ANALOG-TO-DIGITAL CONVERTER
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Maker  TI1 [Texas Instruments]
Homepage  http://www.ti.com
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ADS807 Datasheet(HTML) 15 Page - Texas Instruments

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ADS807
15
SBAS072A
www.ti.com
FIGURE 8. Recommended Bypassing for the Supply Pins.
performance. All ground connections on the ADS807 are
internally joined together eliminating the need for split ground
planes. The ground pins (1, 20, 26) should directly connect
to an analog ground plane which covers the PC board area
under the converter. While designing the layout, it is impor-
tant to keep the analog signal traces separated from any
digital lines to prevent noise coupling onto the analog signal
path. Because of the its high sampling rate, the ADS807
generates high frequency current transients and noise (clock
feedthrough) that are fed back into the supply and reference
lines. This requires that all supply and reference pins are
sufficiently bypassed. Figure 8 shows the recommended
decoupling scheme for the ADS807. In most cases, 0.1
µF
ceramic chip capacitors at each pin are adequate to keep the
impedance low over a wide frequency range. Their effective-
ness largely depends on the proximity to the individual
supply pin. Therefore, they should be located as close to the
supply pins as possible. If system supplies are not a low
enough impedance, adding a small tantalum capacitor will
yield the best results.
0.1
µF
NOTE: (1) Optional.
0.1
µF
10
µF(1)
+5V
+3V/+5V
0.1
µF
+V
S
+V
S
GND
1, 20
27
15
26
GND
VDRV
28
ADS807
+


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