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ADC12DL080 bảng dữ liệu(PDF) 8 Page - Texas Instruments

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tên linh kiện ADC12DL080
Giải thích chi tiết về linh kiện  selecting amplifiers, adcs, and clocks for high-performance signal paths
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ADC12DL080 bảng dữ liệu(HTML) 8 Page - Texas Instruments

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SIGNAL PATH
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7
the datasheet-specified, input common-mode-volt-
age-range limits. For AC-coupled input operation,
the input common mode will be at the same
potential as the output common mode, or the VCM-
pin voltage. For DC-coupled single-to-differential
operation, the input common-mode voltage is the
output common-mode voltage divided down by
RF and RG. This is not an issue with split-voltage
supplies such as ±5V. However, for single-supply
operation such as GND and +10V, the divided-
down-output common-mode voltage, appearing as
the input common-mode voltage, must not exceed
the amplifier’s rated operating-input common-
mode-voltage range. Lack of headroom on the input
can force the use of a negative rail lower than ground.
For the best distortion performance, unlimited by
amplifier input or output headroom, split ±5V
supplies are recommended.
An ideal amplifier for ADC driving would be
completely transparent to the ADC and not degrade
its performance. Although this is a challenge, it is
possible to minimize performance degradation. From
a DC-specification perspective, the most fundamental
amplifier requirement is that the output-voltage range
of the amplifier supports the ADC-input-voltage
range for full-scale output. From an AC perspective,
the amplifier must have flat bandwidth and gain
such that the wanted signal is not attenuated by the
amplifier’s frequency response, as well as low-enough
noise and distortion levels that they do not impact
the ADC’s performance.
The required amplifier bandwidth is dictated by the
input-signal-frequency spectrum to be processed and
requirements for good distortion performance at high
frequencies. The maximum signal frequency and the
ADC’s full-scale input-voltage level determine the
required amplifier slew rate and Large Signal Band-
width (LSBW). These specifications determine the
channel bandwidth when driving the ADC input at
full scale.
Due to the roll off of the amplifier open-loop gain,
amplifier distortion starts to degrade at frequen-
cies much lower than the amplifier LSBW. In the
case of VFB amplifiers with a fixed-gain-bandwidth
product, the amount of available gain for very-high-
frequency signals can be limited. A CFB amplifier
with relatively wide-gain independent bandwidth
and excellent gain flatness is a good choice for
very-high-frequency signals. The actual gain flat-
ness required will depend on the application
requirements.
Assuming all of the other AC and DC specifications
can be met, noise and distortion will ultimately be the
two main specifications of interest for a given ADC
and amplifier combination since these determine
the SINAD. The ENOB can be calculated from the
SINAD using the equation:
ENOB = (SINAD - 1.76)/6.02, where SINAD is in dB
Since distortion and noise are specified separately
for the amplifier and ADC, it is necessary to look
at how combining the amplifier with the ADC
affects the overall subsystem’s performance. The
noise of the driving amplifier and the noise of the
ADC are uncorrelated and can be rss-summed
together for the purpose of analysis. In order
for the amplifier noise not to degrade the ADC
performance, the amplifier output noise over the
frequency band of interest ideally should be at least
6 dB less than the ADC input noise.
The amplifier output-noise voltage spectral density
measured in V/ Hz, is calculated by root-sum-squaring
the output-noise voltage contributions arising from the
amplifier’s input-voltage noise and current noise, with
the additional noise of any external resistors around
the amplifier. The total noise seen at the ADC input
depends on the channel bandwidth, so it is critical to
optimize the design for minimum acceptable band-
width in order to maximize noise performance. Unless
limited by a channel filter, noise and distortion prod-
ucts from the entire amplifier bandwidth will all be
sampled by the ADC and aliased back down into the
1st Nyquist zone. In addition to band-limiting to fS/2,
the channel filter is chosen to limit the amplifier-noise
bandwidth and attenuate any distortion products.
Ideally, any in-band, amplifier-distortion products
should be 6 dB lower than the ADC’s own distortion
products. Choosing the sample frequency carefully
SignalPathDesigner.indd 7
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9/5/07 3:24:35 PM
9/5/07 3:24:35 PM


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