ADC1207S080 NXP Semiconductors, ADC1207S080 Datasheet - Page 15

• Manufacturer Part Number: ADC1207S080
• Description: Single 12 bits ADC
• Manufacturer: NXP Semiconductors

NXP Semiconductors
ADC1207S080_2
Product data sheet
11.2.6 IMD2 (IMD3)
From a dual tone input sinusoid (f
the coherence criterion), the intermodulation distortion products IMD2 and IMD3
(respectively, 2nd and 3rd order components) are defined, as follows.
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:
with
IMD dB
P
P
Fig 8. Spectral of dual tone input sine wave with frequency
intermod
signal
2
im f
=
magnitude
t1
=
=
2
f
corresponding to the power in the intermodulation component at frequency f
t1
10log
2
im f
+
f
1
t1
2
Single 12 bits ADC, up to 80 MHz with direct/ultra high IF sampling
f
10
t2
–
f
2
f
2f
t2
P
--------------------- -
2
+
P
Rev. 02 — 7 August 2008
intermod
–
signal
f
1
f
2
2
im 2 f
2
im f
f
1
2f
1
t1
t1
–
+
f
2
t1
f
f
t2
2f
t2
and f
f
2
1
+
+
+ f
2f
2
2
im 2 f
1
t2
2
im f
, these frequencies being chosen according to
f
1
t1
t1
+ 2f
3f
–
+
2 f
2
2
frequency
f
t2
t2
2f
3f
1
+
1
+ f
2
2
im f
t1
ADC1207S080
+
2 f
t2
+
© NXP B.V. 2008. All rights reserved.
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t
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