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ADS8320EB Datasheet(PDF) 9 Page - Burr-Brown (TI)

[Old version datasheet] Texas Instruments acquired Burr-Brown Corporation.
Part No. ADS8320EB
Description  16-Bit, High-Speed, 2.7V to 5V microPower Sampling ANALOG-TO-DIGITAL CONVERTER
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Maker  BURR-BROWN [Burr-Brown (TI)]
Homepage  http://www.burr-brown.com
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ADS8320EB Datasheet(HTML) 9 Page - Burr-Brown (TI)

 
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9
®
ADS8320
NOISE
The noise floor of the ADS8320 itself is extremely low, as
can be seen from Figures 1 and 2, and is much lower than
competing A/D converters. It was tested by applying a low
noise DC input and a 5.0V reference to the ADS8320 and
initiating 5000 conversions. The digital output of the A/D
2
2510
3
2490
4
Code
56
00
00
1
FIGURE 1. Histogram of 5000 Conversions of a DC Input
at the Code Transition.
FIGURE 2. Histogram of 5000 Conversions of a DC Input
at the Code Center.
2
72
3
4864
4
Code
56
64
0
00
1
converter will vary in output code due to the internal noise
of the ADS8320. This is true for all 16-bit SAR-type A/D
converters. Using a histogram to plot the output codes, the
distribution should appear bell-shaped with the peak of the
bell curve representing the nominal code for the input value.
The
±1σ, ±2σ, and ±3σ distributions will represent the
68.3%, 95.5%, and 99.7%, respectively, of all codes. The
transition noise can be calculated by dividing the number of
codes measured by 6 and this will yield the
±3σ distribution
or 99.7% of all codes. Statistically, up to 3 codes could fall
outside the distribution when executing 1000 conversions.
The ADS8320, with < 3 output codes for the
±3σ distribu-
tion, will yield a <
±0.5LSB transition noise. Remember, to
achieve this low noise performance, the peak-to-peak noise
of the input signal and reference must be < 50
µV.
AVERAGING
The noise of the A/D converter can be compensated by
averaging the digital codes. By averaging conversion re-
sults, transition noise will be reduced by a factor of 1/
√n,
where n is the number of averages. For example, averaging
4 conversion results will reduce the transition noise by 1/2
to
±0.25 LSBs. Averaging should only be used for input
signals with frequencies near DC.
For AC signals, a digital filter can be used to low pass filter
and decimate the output codes. This works in a similar
manner to averaging; for every decimation by 2, the signal-
to-noise ratio will improve 3dB.
DIGITAL INTERFACE
SIGNAL LEVELS
The digital inputs of the ADS8320 can accommodate logic
levels up to 5.5V regardless of the value of VCC. Thus, the
ADS8320 can be powered at 3V and still accept inputs from
logic powered at 5V.
The CMOS digital output (DOUT) will swing 0V to VCC. If
VCC is 3V and this output is connected to a 5V CMOS logic
input, then that IC may require more supply current than
normal and may have a slightly longer propagation delay.


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