參數(shù)資料
型號(hào)： TDA9910HW/8/C1
廠商： NXP SEMICONDUCTORS
元件分類： ADC
英文描述： 1-CH 12-BIT RESISTANCE LADDER ADC, PARALLEL ACCESS, PQFP48
封裝： 7 X 7 MM, 1 MM HEIGHT, PLASTIC, SOT545-2, MS-026, HTQFP-48
文件頁(yè)數(shù)： 8/21頁(yè)
文件大?。?/td> 128K
代理商： TDA9910HW/8/C1
TDA9910_4
NXP B.V. 2007. All rights reserved.
Product data sheet
Rev. 04 — 12 June 2007
16 of 21
NXP 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 signicant 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 dened as the lowest detectable
signal level. In W-CDMA, it can be far below the noise oor. This difference, between the
sensitivity and the noise oor, is dened 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 oor. It represents the
ratio of the adjacent-channel power and the average power level of the channel. The ACS
is dened by the sum of SENR and ACPR.
Table 9.
Examples of possible fi, fCLK, IF BW combinations supported
fi (MHz)
fCLK (Msample/s)
IF BW (MHz) [1]
SNR (dB)
SFDR (dBc)
350
80
5.00
65
71
243.95
9.60
0.25
71
80
96
76.80
1.60
72
76
96
76.80
4.80
71
77
96
76.80
20.00
68
76
80
61.44
10.00
70
85
78.4
44.80
3.50
71
76
70
40.00
1.25
72
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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