adc12d040civsx National Semiconductor Corporation, adc12d040civsx Datasheet - Page 21

• Manufacturer Part Number: adc12d040civsx
• Description: Dual 12-bit, 40 Msps, 600 Mw A/d Converter With Internal/external Reference And Sample-and-hold
• Manufacturer: National Semiconductor Corporation

Applications Information
improve performance. The LMH6702 and the LMH6628
have been successfully used to drive the analog inputs of the
ADC12D040.
Also, it is important that the signals at the two inputs have
exactly the same amplitude and be exactly 180
with each other. Board layout, especially equality of the
length of the two traces to the input pins, will affect the
effective phase between these two signals. Remember that
an operational amplifier operated in the non-inverting con-
figuration will exhibit more time delay than will the same
device operating in the inverting configuration.
(Continued)
o
out of phase
21
Operating with the reference pins outside of the speci-
fied range. As mentioned in Section 1.2, V
the range of
Operating outside of these limits could lead to performance
degradation.
Using a clock source with excessive jitter, using exces-
sively long clock signal trace, or having other signals
coupled to the clock signal trace. This will cause the
sampling interval to vary, causing excessive output noise
and a reduction in SNR and SINAD performance.
1.0V ≤ V
REF
≤ 2.4V
REF
should be in
www.national.com