User manual

RS232-ADC16/24
8.6 Baud rate error
Since SYSCLK is not dividable by standard baud rates errors occur when
setting transmission speed. The table shows errors for the default value
according to SYSCLK.
Baud rate errors
f
SYSCLK
MHz
Desired baud rate Resulting baud
rate
Error in %
3.0625 57600 56179 2.47
6.125 115200 114285 0.79
12.25 115200 114942 0.22
24.5 115200 117647 2.12
49 115200 113636 1.36
8.7 ADC
Data of the following tables is collected by RS232-ADC16 device with firmware
version 1.11 at various clock and decimation rates.
Precision and performance
REG_ADC_DEC I in mA f
output
Hz
Min
mV
Max
mV
Noise
mV
Noise
%
Bit
5 19.0 261 -4.73 5.53 10.26 0.4104 7.93
6 19.8 231 -1.03 1.11 2.14 0.0856 10.19
7 20.1 188 -0.21 0.23 0.44 0.0176 12.47
8 22.1 136 -0.15 0.11 0.26 0.0140 13.23
9 23.3 88 -0.12 0.08 0.20 0.0080 13.61
10 24.2 52 -0.08 0.08 0.16 0.0064 13.93
11 24.8 29 -0.08 0.04 0.12 0.0048 14.35
SYSCLK = 24.5 Mhz
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