Instruction Manual

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
----------------
⎝⎠
⎛⎞
–
+=