adc1206s040 NXP Semiconductors, adc1206s040 Datasheet - Page 28

• Manufacturer Part Number: adc1206s040
• Description: Single 12 Bits Adc, Up To 40 Mhz, 55 Mhz Or 70 Mhz
• Manufacturer: NXP Semiconductors

NXP Semiconductors
ADC1206S040_055_070_2
Product data sheet
13.3.2 IMD2 (IMD3)
13.4 Noise Power Ratio (NPR)
The ratio of the RMS value of either tone to the RMS value of the worst second (third)
order intermodulation product.
The total intermodulation distortion IMD is given by
where,
and
is the power in the intermodulation component at frequency f
When using a notch-filtered broadband white-noise generator as the input to the ADC
under test, the Noise Power Ratio is defined as the ratio of the average out-of-notch to the
in-notch power spectral density magnitudes for the FFT spectrum of the ADC output
sample set.
IMD dB
P
signal
2
im
P
=
+
intermod
f
=
t
2
2
im
10
f
t1
log
f
t1
=
+
+
P
-----------------------
2 f
P
intermod
2
im
2
signal
Rev. 02 — 12 August 2008
t2
f
f
t2
+
t1
–
2
im
f
t2
2 f
Single 12 bits ADC, up to 40 MHz, 55 MHz or 70 MHz
–
t1
–
2
im
f
t2
ADC1206S040/055/070
f
t1
+
+
f
t2
2
im
2 f
+
t1
2
im
+
f
f
t2
t1
t
–
.
2 f
t2
© NXP B.V. 2008. All rights reserved.
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