adc16dv160cilq National Semiconductor Corporation, adc16dv160cilq Datasheet - Page 19

• Manufacturer Part Number: adc16dv160cilq
• Description: Dual Channel, 16-bit, 160 Msps Analog-to-digital Converter With Ddr Lvds Outputs
• Manufacturer: National Semiconductor Corporation

The simulated S11 of the input circuit of the ADC16DV160 is
shown in
datasheet revision. Note that the simulated S11 normally
closely matches the measured S11.) Up to 500 MHz, it is pre-
dominantly capacitive loading with small stray resistance and
inductance as shown in
mination at a given input frequency band has to be added to
Figure
8. (Measured data will be provided in a future
Figure
8. An appropriate resistive ter-
FIGURE 7. Input Equivalent Circuit
19
improve signal integrity. Any shunt capacitor on the analog
input pin deteriorates signal integrity but it provides high fre-
quency charge to absorb the charge injected by the sampling
switches. An optimal shunt capacitor is dependent on input
signal frequency as well as the impedance characteristic of
the analog input signal path including components like trans-
formers, termination resistors, and AC coupling capacitors.
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