TDA9910HW/6 PHILIPS [NXP Semiconductors], TDA9910HW/6 Datasheet - Page 16

• Manufacturer Part Number: TDA9910HW/6
• Description: 12-bit, up to 80 Msample/s, Analog-to-Digital Converter (ADC) direct/ultra high IF sampling
• Manufacturer: PHILIPS [NXP Semiconductors]

Philips Semiconductors
11. Application information
9397 750 14418
Objective data sheet
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
mode.
Table 9:
[1]
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.
f
350
243.95
96
96
96
80
78.4
70
i
Fig 9. Adjacent channel sensitivity and ADC sensibility.
(MHz)
IF bandwidth corresponds to the observed area on the ADC output spectrum.
describes some possible applications with the TDA9910 in high IF sampling
Examples of possible f
f
80
9.60
76.80
76.80
76.80
61.44
44.80
40.00
CLK
(Msample/s)
Rev. 02 — 9 December 2004
12-bit, up to 80 Msample/s, Analog-to-Digital Converter (ADC)
interfering channel
i
, f
CLK
IF BW (MHz)
5.00
0.25
1.60
4.80
20.00
10.00
3.50
1.25
, IF BW combinations supported
wanted channel
NF
ACS
[1]
SNR (dB)
65
71
72
71
68
70
71
72
001aaa517
SENR
ACPR
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
noise floor
sensibility
thermal noise
TDA9910
SFDR (dBc)
71
80
76
77
76
85
76
79
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