5962-0924001VXC Datasheet, PDF (33/46 Pages) Texas Instruments – 12-Bit, 1-GSPS Analog-to-Digital Converter

ADS5400-SP
www.ti.com
SLAS669C – SEPTEMBER 2010 – REVISED AUGUST 2012
Clock Inputs
The ADS5400 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 30. In low-input-frequency applications, where jitter may not
be a big concern, the use of a single-ended clock (as shown in Figure 31) 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 31.
CLKINP
CLKINN
ADS5400
~7.2 nH Bond Wire
~1.5 pF
~0.2 pF
Package Bondpad
GND
~7.2 nH Bond Wire
~1.5 pF
~0.2 pF
Package Bondpad
AVDD5
10 W
400 W
0.25 pF
AVDD5
AVDD5V/2
200 W
400 W
0.25 pF
GND
10 W
Internal
Clock
Buffer
GND
Figure 30. Clock Input Circuit
Square Wave or
Sine Wave
0.01 mF
CLK
ADS5400
CLK
0.01 mF
Figure 31. Single-Ended Clock
Copyright © 2010–2012, Texas Instruments Incorporated
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