Cirrus-logic AN263 Manual de usuario Pagina 3

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AN263
AN263REV1 3
Figure 2. Effective Conversion System Gain
2.3 Equivalent System Noise Calculation
The output referred system noise voltage (V
nsys
) can be calculated using the expressions for the gain co-
efficient, equivalent ADC and DAC noise voltages.
Where:
Following substitution and simplification:
DAC
ADC
K
V
fsadc
V
fsdac
K
V
fsdac
V
fsadc
----------------=
V
nsys
V
ndac
2
KV
nadc
×()
2
+()=
V
ndac
V
fsdac
10
DR
dac
20
----------------
⎝⎠
⎛⎞
------------------------=
V
nadc
V
fsadc
10
DR
adc
20
----------------
⎝⎠
⎛⎞
------------------------=
K
V
fsdac
V
fsadc
----------------=
V
nsys
V
fsdac
10
DR
dac
10
----------------
⎝⎠
⎛⎞
10
DR
adc
10
----------------
⎝⎠
⎛⎞
+=
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