TEF6901AH/V5S,557 Datasheet TEF6901AH/V5S,518, TEF6901AH/V5S,557 | P37-P39

Product data sheet Rev. 03 — 20 March 2008 37 of 107

NXP Semiconductors

TEF6901A

Integrated car radio

8.2.5 Write mode: data byte AGC

Table 34. AGC - format of data byte 04h with default setting (buffered)

7 6 5 4 3 2 1 0

AGCSW IFGAIN 0 0 AGC1 AGC0 KAGC LODX

00 0000

Table 35. AGC - data byte 04h bit description

Bit Symbol Description

7 AGCSW RF AGC switch

0 = no control of unused RF AGC

1 = unused AM RF AGC PIN diode at FM mode, or unused FM RF

AGC PIN diode at AM mode is supplied with a constant current for ﬁxed

attenuation

6 IFGAIN IF gain

0 = IF gain for low loss 10.7 MHz ﬁlter

1 = increased IF gain (3 dB) for high loss 10.7 MHz ﬁlter

5 and 4 - reserved; 0 = normal operation

3 and 2 AGC[1:0] setting of RF AGC threshold voltage

FM mixer 1 input voltage (RMS value)

00 = 24 mV

01 = 17 mV

10 = 12 mV

11 = 9 mV

AM mixer 1 input voltage (peak-to-peak value)

00 = 1000 mV

01 = 700 mV

10 = 500 mV

11 = 350 mV

1 KAGC keyed AGC

FM mode

0 = keyed AGC off

1 = keyed AGC on; the AGC start level is shifted to a value 10 dB above

the standard AGC start level, when the level voltage of the wanted RF

signal is below the threshold level voltage for narrow-band AGC

AM mode

0 = RF cascode AGC enabled with full range

1 = RF cascode AGC enabled with limited range

0 LODX FM: local switch

0 = standard operation (DX)

1 = forced FM RF AGC attenuation (LOCAL)

AM: trigger signal from AM IF noise blanker to AM audio noise blanker

0 = trigger signal active for low modulation (m < 0.05) only

1 = trigger signal always active, independent of modulation

Product data sheet Rev. 03 — 20 March 2008 38 of 107

NXP Semiconductors

TEF6901A

Integrated car radio

8.2.6 Write mode: data byte BAND

Different PLL charge pump currents are used for different reference frequencies to

maintain best PLL loop stability; see Table 40.

Settings FREF[2:0] = 000 (100 kHz) and FREF[2:0] = 001 (50 kHz) include additional high

current charge pump control to realize fast PLL locking within 1 ms.

Table 36. BAND - format of data byte 05h with default setting (buffered)

7 6 5 4 3 2 1 0

BAND2 BAND1 BAND0 FREF2 FREF1 FREF0 LOINJ 0

0010000

Table 37. BAND - data byte 05h bit description

Bit Symbol Description

7 to 5 BAND[2:0] FM and AM band selection; see

Table 38

4 to 2 FREF[2:0] PLL reference frequency; see

Table 39

1 LOINJ FM mixer 1 image suppression

0 = high injection image suppression

1 = low injection image suppression

0 - reserved; 0 = normal operation

Table 38. Decoding of BAND bits

BAND2 BAND1 BAND0 Divider ratio M Receiver band

000- reserved

0012FM

0103FM

0116AM

1008AM

10110AM

11016AM

11120AM

Table 39. Reference frequencies

FREF2 FREF1 FREF0 f

ref

0 0 0 100 kHz

0 0 1 50 kHz

0 1 0 25 kHz

0 1 1 20 kHz

1 0 0 10 kHz

1 0 1 reserved

1 1 0 reserved

1 1 1 reserved

Product data sheet Rev. 03 — 20 March 2008 39 of 107

NXP Semiconductors

TEF6901A

Integrated car radio

[1] X = don’t care.

8.2.7 Tuning overview

High injection LO (Europe FM, US FM and AM):

with LOINJ = 0 to achieve full image suppression in FM.

Low injection LO (Japan FM and OIRT):

with LOINJ = 1 to achieve full image suppression in FM.

where: M is the divider ratio of the VCO frequency for AM mixer 1 and FM mixer 1

Table 40. Charge pump source

[1]

FREF2 FREF1 FREF0 LOINJ Charge pump

current

ref

0 0 0 X CP1 100 kHz

0 0 1 X CP2 50 kHz

0 1 0 X CP3 25 kHz

0 1 1 1 CP3 20 kHz

0 1 1 0 CP4 20 kHz

1 0 0 X CP5 10 kHz

1 0 1 X reserved

1 1 0 X reserved

1 1 1 X reserved

Table 41. Standard tuner settings

Broadcast band BAND[2:0] M FREF[2:0] f

ref

LOINJ Tuning step

Europe FM and US FM 001 2 000 100 kHz 0 50 kHz

Japan FM 010 3 000 100 kHz 1 33.3 kHz

Eastern Europe FM

(OIRT FM)

010 3 011 20 kHz 1 6.67 kHz

AM MW and LW 111 20 011 20 kHz 0 1 kHz

AM SW 120 m to 60 m 110 16 100 10 kHz 0 0.625 kHz

AM SW 49 m to 22 m 101 10 100 10 kHz 0 1 kHz

AM SW 25 m to 15 m 100 8 100 10 kHz 0 1.25 kHz

AM SW 16 m to 11 m 011 6 100 10 kHz 0 1.67 kHz

10.7 MHz+()M×

ref

-----------------------------------------------------

10.7 MHz–()M×

ref

-----------------------------------------------------

tuning step

ref

------

VCO

mixer 1

---------------

TEF6901AH/V5S,557

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Tuners INTEGRATED CAR RADIO

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