adc12dl066civs National Semiconductor Corporation, adc12dl066civs Datasheet - Page 18

• Manufacturer Part Number: adc12dl066civs
• Description: Dual 12-bit, 66 Msps, 450 Mhz Input Bandwidth A/d Converter W/internal Reference
• Manufacturer: National Semiconductor Corporation

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Applications Information
For undersampling applications, the RC pole should be set
at about 1.5 to 2 times the maximum input frequency to
maintain a linear delay response.
Note that the ADC12DL066 is not designed to operate with
single-ended inputs. However, doing so is possible if the
degraded performance is acceptable. See Section 1.3.1.
FIGURE 4. Application Circuit using Transformer or Differential Op-Amp Drive Circuit
FIGURE 5. Differential Drive Circuit using a fully differential amplifier.
(Continued)
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Figure 4 shows a narrow band application with a transformer
used to convert single-ended input signals to differential.
Figure 5 shows the use of a fully differential amplifier for
single-ended to differential conversion.
1.3.3 Input Common Mode Voltage
The input common mode voltage, V
such that the peak excursions of the analog signal does not
go more negative than ground or more positive than 1.0 Volt
below the V
A
supply voltage. The nominal V
20055214
CM
, should be of a value
CM
should gen-
20055213