afs600 Actel Corporation, afs600 Datasheet - Page 123

• Manufacturer Part Number: afs600
• Description: Actel Fusion Programmable System Chips Mixed-signal Family With Optional Arm Support
• Manufacturer: Actel Corporation

Examples
Calculating Accuracy for an Uncalibrated Analog Channel
For a given prescaler range,
where
Calculating Accuracy for a Calibrated Analog Channel
For a given prescaler range,
where
Formula
Example
Formula
Example
Output Voltage = (Channel Output Offset in V) + (Input Voltage x Channel Gain)
Channel Output offset in V = Channel Output offset in LSBs x Equivalent voltage per LSB
Channel Gain Factor = 1+ (% Channel Gain / 100)
Input Voltage = 5 V
Chosen Prescaler range = 8 V range
Refer to
Max. Output Voltage = (Max Positive output offset) + (Input Voltage x Max Gain Factor)
Max. Positive output offset = (8 LSB) x (8mV per LSB in 10-bit mode)
Max. Positive output offset = 64 mV
Max. Gain = 1 + (2/100)
Max. Gain = 1.02
Max. Output Voltage = (64 mV) + (5 V x 1.02)
Max. Output Voltage = 5.164 V
Similarly,
Min. Output Voltage = (Min. Negative output offset) + (Input Voltage x Min. Gain)
= (–136 mV) + (5 V x 0.98) = 4.764 V
Output Voltage = Channel TUE in V + Input Voltage
Channel TUE in V = Channel TUE in LSBs x Equivalent voltage per LSB
Input Voltage = 5 V
Chosen Prescaler range = 8 V range
Refer to
Max. Output Voltage = Max. Channel TUE in V + Input Voltage
Max. Channel TUE in V = (6 LSB) × (8 mV per LSB in 10-bit mode) = 48 mV
Max. Output Voltage = 48 mV + 5 V = 5.048 V
Similarly,
Min Output Voltage = Min Channel TUE in V + Input Voltage = (-48 mV) + 5 V = 4.952 V
Table 2-48 on page
Table 2-49 on page
2-107.
2-108.
A d v an c ed v1 . 4
Actel Fusion Programmable System Chips
2-109