参数资料
型号: ADC08100
厂商: National Semiconductor Corporation
英文描述: 8-Bit, 20 MSPS to 100 MSPS, 1.3 mW/MSPS A/D Converter
中文描述: 8位,20 MSPS的100 MSPS的,1.3毫瓦/ MSPS的A / D转换
文件页数: 15/19页
文件大小: 572K
代理商: ADC08100
Applications Information
(Continued)
V
should always be at least 1.0V more positive than V
RB
to minimize noise.
The V
pin is the center of the reference ladder and should
be bypassed to a clean, quiet point in the analog ground
plane with a 0.1 μF capacitor. DO NOT allow this pin to float.
2.0 THE ANALOG INPUT
The analog input of theADC08100 is a switch followed by an
integrator. The input capacitance changes with the clock
level, appearing as 3 pF when the clock is low, and 4 pF
when the clock is high. Since a dynamic capacitance is more
difficult to drive than is a fixed capacitance, choose an
amplifier that can drive this type of load. 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
.
10137133
FIGURE 3. Driving the reference to force desired values requires driving with a low impedance source.
A
www.national.com
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