tda8769hw/8 NXP Semiconductors, tda8769hw/8 Datasheet - Page 15

• Manufacturer Part Number: tda8769hw/8
• Description: 12-bit, 60/80/105 Msps Analog-to-digital Converter Adc Nyquist/high If Sampling
• Manufacturer: NXP Semiconductors

Philips Semiconductors
Table 5 Examples of possible f
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.
2003 Dec 09
handbook, full pagewidth
12-bit, 60/80/105 Msps Analog-to-Digital Converter
(ADC) Nyquist/high IF sampling
f
243.95
243.95
243.95
i
69.99
(MHz)
10.8
250
190
106
86
80
70
27
Fig.5 Adjacent channel selectivity and analog-to-digital converter sensitivity.
f
clk
i
19.20
52.00
40.00
76.80
76.80
61.44
40.00
58.98
, f
9.60
9.60
51.2
32.5
(MHz)
clk
and f
interfering
channel
i
bandwidth combinations supported
f
i
BW (MHz)
channel
NF
wanted
10.00
0.20
0.20
0.20
0.20
1.25
5.00
5.00
5.00
1.25
0.30
3.5
15
ACS
SENR
ACPR
MBL875
noise floor
sensitivity
thermal noise
SNR (dB)
66.5
62.6
68.4
65.7
72.0
70.8
72.2
84.3
(tbf)
(tbf)
(tbf)
70
Objective specification
SFDR (dBc)
TDA8769
79.9
68.5
77.2
80.0
80.0
83.6
87.1
83.0
(tbf)
(tbf)
(tbf)
70