參數(shù)資料
型號: TDA9910
廠商: NXP Semiconductors N.V.
元件分類: ADC
英文描述: 12-bit, up to 80 Msample/s, Analog-to-Digital Converter (ADC) direct/ultra high IF sampling
中文描述: 12位,高達80 Msample /秒,模擬到數(shù)字轉(zhuǎn)換器(ADC)直接/超高IF采樣
文件頁數(shù): 16/21頁
文件大小: 138K
代理商: TDA9910
9397 750 14418
Koninklijke Philips Electronics N.V. 2004. All rights reserved.
Objective data sheet
Rev. 02 — 9 December 2004
16 of 21
Philips Semiconductors
TDA9910
12-bit, up to 80 Msample/s, Analog-to-Digital Converter (ADC)
11. Application information
11.1 TDA9910 in 3G radio receivers
The TDA9910 has been proven in many 3G radio receivers with various operating
conditions regarding Input Frequency (IF), signal IF bandwidth and sampling frequency.
The TDA9910 provides with a maximum analog input signal frequency of 400 MHz. It
allows a significant cost-down of the RF front-end, from two mixers to only one, even in
multi-carriers architecture.
Table 9
describes some possible applications with the TDA9910 in high IF sampling
mode.
[1]
IF bandwidth corresponds to the observed area on the ADC output spectrum.
For a dual carrier W-CDMA receiver, the most important parameters are sensitivity and
Adjacent Channel Selectivity (ACS). The sensitivity is defined as the lowest detectable
signal level. In W-CDMA, it can be far below the noise floor. This difference, between the
sensitivity and 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 full-scale
3 dB peak and the noise floor. It represents the
ratio of the adjacent-channel power and the average power level of the channel. The ACS
is defined by the sum of SENR and ACPR.
Table 9:
f
i
(MHz)
350
243.95
96
96
96
80
78.4
70
Examples of possible f
i
, f
CLK
, IF BW combinations supported
f
CLK
(Msample/s)
IF BW (MHz)
[1]
80
5.00
9.60
0.25
76.80
1.60
76.80
4.80
76.80
20.00
61.44
10.00
44.80
3.50
40.00
1.25
SNR (dB)
65
71
72
71
68
70
71
72
SFDR (dBc)
71
80
76
77
76
85
76
79
Fig 9.
Adjacent channel sensitivity and ADC sensibility.
001aaa517
ACPR
NF
interfering channel
wanted channel
ACS
noise floor
sensibility
thermal noise
SENR
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