adc1206s040 NXP Semiconductors, adc1206s040 Datasheet - Page 27

• 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
Fig 27. Spectral analysis (dual-tone)
(dB)
120
160
40
80
0
0
13.2.3 Total Harmonic Distortion (THD)
13.2.4 Signal-to-Noise ratio (S/N)
13.2.5 Spurious Free Dynamic Range (SFDR)
13.3.1 Spectral analysis (dual-tone)
13.3 Intermodulation distortion
The ratio of the power of the harmonics to the power of the fundamental. For k-1
harmonics the THD is:
where
The value of k is usually 6 (i.e. calculation of THD is done on the first 5 harmonics).
The ratio of the output signal power to the noise power, excluding the harmonics and the
DC component.
The number SFDR specifies available signal range as the spectral distance between the
amplitude of the fundamental and the amplitude of the largest spurious (harmonic and
non-harmonic, excluding DC component).
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.
P
signal
5
P
=
harmonics
2
1
S/N dB
10
=
Rev. 02 — 12 August 2008
2
2
THD dB
+
=
10
2
3
+
log
15
t
Single 12 bits ADC, up to 40 MHz, 55 MHz or 70 MHz
=
2
k
1 and f
P
---------------- -
P
10
signal
noise
log
t
ADC1206S040/055/070
2, these frequencies being chosen according to
SFDR dB
P
-------------------------- -
harmonics
P
signal
20
IMD3
=
20
log
measured output range (HHz)
----------------- -
max s
25
1
© NXP B.V. 2008. All rights reserved.
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