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參數(shù)資料
| 型號： | TDA8769 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | 12-bit, 60/80/105 Msps Analog-to-Digital Converter (ADC) Nyquist/high IF sampling |
| 中文描述： | 12位，60/80/105 Msps的模擬到數(shù)字轉(zhuǎn)換器（ADC）奈奎斯特/ IF采樣高 |
| 文件頁數(shù)： | 15/28頁 |
| 文件大?。?/td> | 217K |
| 代理商： | TDA8769 |
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2003 Dec 09
15
Philips Semiconductors
Objective specification
12-bit, 60/80/105 Msps Analog-to-Digital Converter
(ADC) Nyquist/high IF sampling
TDA8769
Table 5
Examples of possible f
i
, f
clk
and f
i
bandwidth combinations supported
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.
f
i
(MHz)
250
243.95
243.95
243.95
190
106
86
80
70
69.99
27
10.8
f
clk
(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
f
i
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)
SFDR (dBc)
66.5
62.6
68.4
65.7
72.0
70.8
72.2
(tbf)
70
(tbf)
(tbf)
84.3
79.9
68.5
77.2
80.0
80.0
83.6
87.1
(tbf)
70
(tbf)
(tbf)
83.0
handbook, full pagewidth
MBL875
ACPR
NF
interfering
channel
wanted
channel
ACS
noise floor
sensitivity
thermal noise
SENR
Fig.5 Adjacent channel selectivity and analog-to-digital converter sensitivity.
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