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What is AN100?

This electronic component, produced by the manufacturer "Philips", performs the same function as "An Overview if Data Converters".


AN100 Datasheet PDF - Philips

Part Number AN100
Description An Overview if Data Converters
Manufacturers Philips 
Logo Philips Logo 


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LINEAR PRODUCTS
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AN100
An overview of data converters
December 1991
Philips Semiconductors

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AN100 equivalent
Philips Semiconductors
An overview of data converters
Application note
AN100
change during this conversion is generally accepted as the value of
LSB (for n-bit accuracy).
Accuracy and speed are determined primarily by the properties of
the DAC and the comparator. Linearity is determined primarily by the
linearity of the DAC. If the DAC is non-monotonic, one or more
codes will be missing from the A/D converter’s output range.
Figure 11 is the transfer function of a 3-bit binary coded A/D
converter with a 0 to +10V input range. A 3-bit ADC is shown for
simplicity, but the principle applies to ADCs of any resolution. Note
that there is a LSB offset at the input such that the first count occurs
when the input is equal to LSB. The center of the range for the first
www.DataShesette4pU.occocmurs, therefore, when the input is equal to the value of one
LSB, and the error at the switch point is limited to LSB. This error is
known as the quantization error as it is derived from the smallest
input quantity that can be resolved. If an ADC has a specified error
of LSB maximum, this means that any transition point can be as far
as LSB from where it should be.
Gain Error
A Gain Error is shown in Figure 14.
Relative Accuracy
Relative Accuracy is the deviation of an actual bit transition from the
ideal transition value at any level over the range of the ADC (% FS).
See Figure 15.
111
110
101
100
011
010
001
CONSIDERATIONS FOR A/D CONVERTERS
Analog input signal range and resolution required
Linearity requirement and stability
Conversion speed required
Monotonicity requirement: Can missing codes be tolerated?
Character of input signal: Is it noisy, sampled, filtered, slowly
varying?
Transfer characteristics (type of coding)
A/D CONVERTER TERMS
Resolution
Resolution is the input change required to increment the output
between the two adjacent codes. This term also refers to the
number of bits in the output word and, hence, the number of discrete
output codes the input analog signal can be broken into. Expressed
in “bits” resolution.
Transfer Characteristic
The Transfer Characteristic is the relationship of the output digital
word (code) to the input analog signal, i.e., Binary, BCD.
Conversion Speed
The Conversion Speed is the speed at which an ADC can make
repetitive data conversions.
Quantizing Error
Quantizing Error is an inherent error in the conversion process due
to finite resolution (discrete output). See Figure 12.
Offset Error
An Offset Error is shown in Figure 13.
INPUT VOLTAGE
SL00675
Figure 11. Transfer Function of an Ideal 3-bit ADC With a 0 to
10V Input Range
111
110
ANALOG
OUTPUT
101
100
011
010
001
000
V(1/2 LSB)
+ 1/2 LSB
ERROR
FUNCTION
– 1/2 LSB
IDEAL TRANSFER
FUNCTION
10V – V (LSB)
EIN
1.25 2.5 3.75 5.06.25 7.5 8.75 10
ANALOG INPUT
Figure 12. Quantizing Errors
SL00676
1991 Dec
5


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