M1AFS250-FGG256I Actel Corporation, M1AFS250-FGG256I Datasheet - Page 130
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M1AFS250-FGG256I
Manufacturer Part Number
M1AFS250-FGG256I
Description
Actel Fusion Family Of Mixed Signal Fpgas
Manufacturer
Actel Corporation
Datasheet
1.M1AFS250-FGG256.pdf
(330 pages)
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Device Architecture
2- 11 4
INL is the deviation of an actual transfer function from a straight line. After nullifying offset and gain
errors, the straight line is either a best-fit straight line or a line drawn between the end points of the
transfer function
Figure 2-89 • Integral Non-Linearity (INL)
In a binary number, the LSB is the least weighted bit in the group. Typically, the LSB is the furthest right
bit. For an ADC, the weight of an LSB equals the full-scale voltage range of the converter divided by 2
where N is the converter’s resolution.
EQ 22
An ADC has no missing codes if it produces all possible digital codes in response to a ramp signal
applied to the analog input.
Offset error indicates how well the actual transfer function matches the ideal transfer function at a single
point. For an ideal ADC, the first transition occurs at 0.5 LSB above zero. The offset voltage is measured
by applying an analog input such that the ADC outputs all zeroes and increases until the first transition
occurs
INL – Integral Non-Linearity
LSB – Least Significant Bit
No Missing Codes
Offset Error
shows the calculation for a 10-bit ADC with a unipolar full-scale voltage of 2.56 V:
(Figure
2-90).
(Figure
2-89).
1 LSB = (2.56 V / 2
Input Voltage to Prescaler
Ideal Output
R e visio n 1
INL = +0.5 LSB
10
) = 2.5 mV
Actual Output
INL = +1 LSB
EQ 22
N
,
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