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TDA18271HD_09 데이터시트(Datasheet) 17 Page - NXP Semiconductors

부품명 TDA18271HD_09
상세내용  Silicon Tuner IC
PDF  70 Pages
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제조사  NXP [NXP Semiconductors]
홈페이지  http://www.nxp.com
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TDA18271HD_4
© NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 04 — 19 May 2009
17 of 70
NXP Semiconductors
TDA18271HD
Silicon Tuner IC
[1]
Depending on the programmed AGC_MODE, AGC1 can be synchronous with either VSYNC or an internal
16 MHz signal; for analog reception, when no synchronization signal is available for VSYNC pin, the
internal reference may be used.
9.3.8 Description of Easy prog byte 4
All calibrations require a precise set of sequential operations, therefore it is mandatory to
follow the flowcharts described in Section 9.4.
The TDA18271HD has two calibration modes: one for the image rejection calibration and
one for the RF tracking filter calibration.
The image rejection calibration optimizes tunable parameters inside the mixer using a set
of internal measurements to ensure a 65 dB typical value of image rejection. The internal
signal used during this phase is generated by the PLL calibration (CAL PLL).
Table 17.
AGC modes
Standard
AGC_MODE[1:0]
EP3[4:3][1]
Reference signal
FM radio
1
1
internal
Analog TV standards
0
1
VSYNC
Digital TV standards
1
1
internal
Table 18.
EP4 - Easy prog byte 4 (subaddress 06h) bit description
Legend: * power-on reset value.
Bit
Symbol
Access Value Description
7
FM_RFN
R/W
selection which input is fed to RF filter
1
FM input (RF LNA on; FM LNA on)
0*
RF input (RF LNA on; FM LNA off)
6
XTOUT_ON
R/W
1*
16 MHz on pins XTOUT
0
not 16 MHz on pins XTOUT
5
-
R/W
1*
must be set to logic 1
4 to 2 IF_LEVEL[2:0]
R/W
IF output level selection and attenuation with regard to
2 V (p-p)
000*
2 V (p-p); 0 dB
001
1.25 V (p-p); 4 dB
010
1 V (p-p); 6 dB
011
0.8 V (p-p); 8 dB
100
not used
101
not used
110
0.6 V (p-p); 10.4 dB
111
0.5 V (p-p); 12 dB
1 to 0 CAL_MODE[1:0] R/W
calibration mode selection
00*
no calibration (Normal mode)
01
Power detection mode
10
image rejection calibration (IRCAL) mode
11
RF tracking filter calibration (RFCAL) mode




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