TDA8769HW/6 Ver la hoja de datos (PDF) - Philips Electronics
Número de pieza
componentes Descripción
Fabricante
TDA8769HW/6
Philips Electronics
TDA8769HW/6 Datasheet PDF : 28 Pages
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Philips Semiconductors
12-bit, 60/80/105 Msps Analog-to-Digital Converter
(ADC) Nyquist/high IF sampling
Objective specification
TDA8769
Table 5 Examples of possible fi, fclk and fi bandwidth combinations supported
fi (MHz)
250
243.95
243.95
243.95
190
106
86
80
70
69.99
27
10.8
fclk (MHz)
9.60
9.60
19.20
52.00
40.00
76.80
76.80
61.44
40.00
58.98
51.2
32.5
fi BW (MHz)
0.20
0.20
0.20
0.20
1.25
5.00
5.00
10.00
5.00
1.25
3.5
0.30
SNR (dB)
66.5
62.6
68.4
65.7
72.0
70.8
72.2
(tbf)
70
(tbf)
(tbf)
84.3
SFDR (dBc)
79.9
68.5
77.2
80.0
80.0
83.6
87.1
(tbf)
70
(tbf)
(tbf)
83.0
For a dual carrier W_CDMA receiver, the most important parameters are the sensitivity and Adjacent Channel Selectivity
(ACS). In W-CDMA, it can be far below the noise floor, is defined by the Sensitivity to Noise Ratio (SENR). Its value is
negative due to the gain processing. The Adjacent Channel Power Ratio (ACPR) is the difference between the peak and
noise floor. It represents the ratio of the adjacent channel power and the average power of the channel. The ACS is
defined by the sum of SENR and ACPR. Figure 5 illustrates the relation between these parameters.
On a typical application with the TDA8769 device, the ACS obtained is 80 dB with an ACPR of 70 dB and a SENR of
10 dB. Moreover, the Noise Figure (NF) of the TDA8769 is 31.5 dB.
handbook, full pagewidth
interfering
channel
wanted
channel
ACS
ACPR
noise floor
NF
SENR
sensitivity
thermal noise
MBL875
Fig.5 Adjacent channel selectivity and analog-to-digital converter sensitivity.
2003 Dec 09
15
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