ADS5463_08 Datasheet, PDF (21/37 Pages) Texas Instruments – 12-Bit, 500-MSPS Analog-to-Digital Converter

ADS5463
www.ti.com .................................................................................................................................................... SLAS515B – NOVEMBER 2006 – REVISED MAY 2008
Clock Inputs
The ADS5463 clock input can be driven with either a differential clock signal or a single-ended clock input. The
equivalent clock input circuit can be seen in Figure 38. In low-input-frequency applications, where jitter may not
be a big concern, the use of a single-ended clock (as shown in Figure 39) could save cost and board space
without much performance tradeoff. When clocked with this configuration, it is best to connect CLK to ground
with a 0.01-µF capacitor, while CLK is ac-coupled with a 0.01-µF capacitor to the clock source, as shown in
Figure 39.
CLK
CLK
ADS5463/5444/5440
~ 2.5 nH Bond Wire
~ 0.5 pF ~ 200 fF
package bondpad
GND
~ 2.5 nH Bond Wire
~ 0.5 pF ~ 200 fF
package bondpad
AVDD5
AVDD5
1000 W
~ 2.4 V
1000 W
Parasitic
~ 0.8 pF
GND
Parasitic
~ 0.8 pF
Internal
Clock
Buffer
GND
Figure 38. Clock Input Circuit
Square Wave or
Sine Wave
0.01 mF
CLK
ADS5463
CLK
0.01 mF
S0168-05
Figure 39. Single-Ended Clock
Copyright © 2006–2008, Texas Instruments Incorporated
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