TDA18271HD/C2.557 NXP Semiconductors, TDA18271HD/C2.557 Datasheet - Page 17

• Manufacturer Part Number: TDA18271HD/C2.557
• Manufacturer: NXP Semiconductors

Specifications of TDA18271HD/C2.557

• Lead Free Status / Rohs Status: Compliant

NXP Semiconductors
TDA18271HD_4
Product data sheet
9.3.8 Description of Easy prog byte 4
Table 17.
[1]
Table 18.
Legend: * power-on reset value.
All calibrations require a precise set of sequential operations, therefore it is mandatory to
follow the flowcharts described in
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).
Standard
FM radio
Analog TV standards
Digital TV standards
Bit
7
6
5
4 to 2 IF_LEVEL[2:0]
1 to 0 CAL_MODE[1:0] R/W
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.
Symbol
FM_RFN
XTOUT_ON
-
AGC modes
EP4 - Easy prog byte 4 (subaddress 06h) bit description
Rev. 04 — 19 May 2009
Access Value Description
R/W
R/W
R/W
R/W
AGC_MODE[1:0]
EP3[4:3]
1
0
1
1
0*
1*
0
1*
000*
001
010
011
100
101
110
111
00*
01
10
11
[1]
Section
1
1
1
selection which input is fed to RF filter
16 MHz on pins XTOUT
not 16 MHz on pins XTOUT
must be set to logic 1
IF output level selection and attenuation with regard to
2 V (p-p)
calibration mode selection
FM input (RF LNA on; FM LNA on)
RF input (RF LNA on; FM LNA off)
2 V (p-p); 0 dB
1.25 V (p-p); 4 dB
1 V (p-p); 6 dB
0.8 V (p-p); 8 dB
not used
not used
0.6 V (p-p); 10.4 dB
0.5 V (p-p); 12 dB
no calibration (Normal mode)
Power detection mode
image rejection calibration (IRCAL) mode
RF tracking filter calibration (RFCAL) mode
9.4.
Reference signal
internal
VSYNC
internal
TDA18271HD
© NXP B.V. 2009. All rights reserved.
Silicon Tuner IC
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