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ADC08100 View Datasheet(PDF) - National ->Texas Instruments

Part NameDescriptionManufacturer
ADC08100 8-Bit, 20 Msps to 100 Msps, 1.3 mW/Msps A/D Converter National-Semiconductor
National ->Texas Instruments National-Semiconductor
ADC08100 Datasheet PDF : 20 Pages
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10137133
FIGURE 3. Driving the reference to force desired values requires driving with a low impedance source.
2.0 THE ANALOG INPUT
The analog input of the ADC08100 is a switch followed by an
integrator. The input capacitance changes with the clock lev-
el, appearing as 3 pF when the clock is low, and 4 pF when
the clock is high. The sampling nature of the analog input
causes current spikes at the input that result in voltage spikes
there. Any amplifier used to drive the analog input must be
able to settle within the clock high time. The LMH6702 and
the LMH6628 have been found to be good amplifiers to drive
the ADC08100.
Figure 4 shows an example of an input circuit using the
LMH6702. Any input amplifier should incorporate some gain
as operational amplifiers exhibit better phase margin and
transient response with gains above 2 or 3 than with unity
gain. If an overall gain of less than 3 is required, attenuate the
input and operate the amplifier at a higher gain, as shown in
Figure 4.
15
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