tda8768a NXP Semiconductors, tda8768a Datasheet - Page 25

• Manufacturer Part Number: tda8768a
• Description: 12-bit, 70 Msps Analog-to-digital Converter Adc
• Manufacturer: NXP Semiconductors

Philips Semiconductors
9397 750 09656
Product data
Fig 27. Spectral analysis (dual-tone)
(dB)
-100
-120
-140
-160
-20
-40
-60
-80
0
0
12.1.3 Intermodulation distortion
2.5
Signal-to-Noise Ratio (SNR):
power, excluding the harmonics and the DC component.
Spurious Free Dynamic Range (SFDR):
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.
Spectral analysis (dual-tone)
From a dual-tone input sinusoid (f
according to the coherence criterion), the intermodulation distortion products IMD2
and IMD3 (respectively, 2nd and 3rd-order components) are defined, as follows.
IMD2 (IMD3):
second (third) order intermodulation product.
SNR dB
SFDR dB
5
7.5
=
=
10
20
The ratio of the RMS value of either tone to the RMS value of the worst
log
log
10
Rev. 02 — 03 July 2002
P
---------------- -
P
----------------- -
max s
signal
noise
a
1
12.5
The ratio of the output signal power to the noise
12-bit, 70 Msps Analog-to-Digital Converter (ADC)
t1
15
and f
t2
, these frequencies being chosen
The number SFDR specifies available
17.5
20
measured output range (MHz)
© Koninklijke Philips Electronics N.V. 2002. All rights reserved.
IMD3
22.5
TDA8768A
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005aaa023
27.5
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