TEF6902AH/V5S,557 NXP Semiconductors, TEF6902AH/V5S,557 Datasheet - Page 41

• Manufacturer Part Number: TEF6902AH/V5S,557
• Description: IC CAR RADIO SGL CHIP CIRC 64QFP
• Manufacturer: NXP Semiconductors

Specifications of TEF6902AH/V5S,557

• Modulation Or Protocol: AM, FM, WB
• Applications: AM/FM Radio Receiver
• Current - Receiving: 102mA
• Data Interface: PCB, Surface Mount
• Antenna Connector: PCB, Surface Mount
• Voltage - Supply: 8 V ~ 9 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-QFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Frequency: -
• Sensitivity: -
• Memory Size: -
• Data Rate - Maximum: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: 935288824557

NXP Semiconductors
TEF6902A_3
Product data sheet
8.2.10.1 Factory alignment of bits IFCAP[3:0]
8.2.10.2 Initialization of the radio
8.2.10.3 Factory alignment of IFCF
Table 47.
The fully integrated IF2 filter of the TEF6902A has to be aligned in order to achieve the
optimum performance at all ambient conditions.
FM IF filter operation point alignment: data byte IFCAP: a single alignment of the FM IF
filter operation range secures an accurate and continuous frequency setting over the full
temperature range and all FM bands.
During radio initialization bit IFCAPA (is logic 1) is used for writing the stored IFCAP[3:0]
value. Afterwards set bit IFCAPA to a logic 0 to start normal operation. Writing of the
IFCAP byte with the alignment value is allowed during radio operation but requires a
setting of bit IFCAPA to logic 0.
FM IF filter center frequency alignment: data byte IFCF: to correct IF frequency errors
caused by an error in the crystal frequency the alignment is preferably performed for every
FM band in use. A test frequency in the center of the band is preferred. An accurate
alignment result is realized by testing for symmetrical filter attenuation.
Bit
7
6 to 4
3 to 0
1. Set bit IFCAPA to logic 1 to disable internal IFCAP control
2. Decrease IFCAP from 15 downwards until I
3. Save this IFCAP setting as alignment value
4. Set bit IFCAPA to logic 0 to return to normal operation
1. Set RF generator level V
2. Set bit IFCFA to logic 1 to enable fast settling of the filter frequency
3. Set bit IFNBW to logic 1 for accuracy (filter is set to narrow 57 kHz bandwidth)
4. Test high side of filter curve: tune to f
5. Change IFCF from 0 to 63 and note the level read result (level voltages)
6. Test low side of filter curve: tune to f
7. Change IFCF from 0 to 63 and note the level voltages
8. Find the IFCF value where both level curves cross (lowest difference) and save this
changes from logic 1 to logic 0
(Japan/OIRT)
(Japan/OIRT)
IFCF value
IFCAP - data byte 08h bit description
Symbol
IFCAPA
-
IFCAP[3:0]
Rev. 03 — 19 March 2008
Description
FM IF filter capacitor align
reserved; 0 = normal operation
IF filter capacitor. Setting of FM IF filter capacitor value by means of
bit IFCAPG of read data byte 5, ID; see
IFCAPA = 1. For alignment set IFCAPA = 1 and check, when read bit
IFCAPG changes from logic 0 to logic 1).
0 = standard operation
1 = align mode and initialization mode (auto correct disabled)
RF
= 200 V
RF
RF
+ 50 kHz (Europe/USA) or f
50 kHz (Europe/USA) or f
2
C-bus read bit IFCAPG (read byte 5; ID)
Table 19
TEF6902A
Integrated car radio
(For initialization set
RF
© NXP B.V. 2008. All rights reserved.
RF
+ 33.3 kHz
33.3 kHz
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