TEF6901AH/V5S,557 Datasheet TEF6901AH/V5S,518, TEF6901AH/V5S,557 | P70-P72

Product data sheet Rev. 03 — 20 March 2008 70 of 107

NXP Semiconductors

TEF6901A

Integrated car radio

[1] The VU-meter mode can be used with external sources only. When the VU-meter mode is active, the radio

quality detection of USN, MOD and offset is limited to AF update tuning only. During VU-meter mode the

bits MOD[4:0] indicate the external source input amplitude. The FM dynamic bandwidth control is disabled

and a ﬁxed bandwidth of 113 kHz is deﬁned. However, other ﬁxed bandwidth settings are available by

DYN = 0 and the setting of BW; data byte 0h (see Table 28). See Table 99 for compression recovery timing

control. VU-meter mode is automatically activated when audio compression is on (COMP = 1).

[1] Setting HTC[2:0] is also in use for setting the timing of weak signal high cut control during radio operation.

3 LDHB loudness high boost; see Figure 39

0 = loudness control is limited to bass gain

1 = loudness controls bass gain and treble gain

2 to 0 LDS[2:0] loudness start setting; loudness start deﬁnes the volume setting below

which loudness control is activated; see

Table 100 and Figure 39

Table 99. VU-meter timing; HTC[2:0] of data byte 0Bh; TIMING

[1]

HTC2 HTC1 HTC0 t

attack

recovery

0 0 0 0.02 s 0.03 s

0 0 1 0.02 s 0.06 s

0 1 0 0.02 s 0.2 s

0 1 1 0.02 s 5 s

1 0 0 0.02 s 0.6 s

1 0 1 0.02 s 10 s

1 1 0 0.02 s 1 s

1 1 1 0.02 s 2 s

Table 100. Loudness start

LDS2 LDS1 LDS0 Start of loudness at volume setting

000−12 dB

001−16 dB

010−20 dB

011−24 dB

100−28 dB

101−32 dB

110−36 dB

111−40 dB

Table 98. LOUDNESS - data byte 17h bit description

…continued

Bit Symbol Description

Product data sheet Rev. 03 — 20 March 2008 71 of 107

NXP Semiconductors

TEF6901A

Integrated car radio

a. LDON = 1, LDHB = 0.

b. LDON = 1, LDHB = 1.

Fig 39. Loudness control characteristics; loudness start = −20 dB, bass frequency = 60 Hz,

treble frequency = 10 kHz; bass gain = 0 dB, treble gain = 0 dB

001aab599

−28

−36

−20

−12

gain

(dB)

−44

audio

(kHz)

10 202 × 10

−2

−20

VOL =

−22

−24

−26

−28

−30

−32

−34

−36

−38

−40

−1

001aab553

−28

−36

−20

−12

gain

(dB)

−44

audio

(kHz)

1010

−1

VOL =

−22

−20

−24

−26/−28

−30

−32

−34/−36

−38

−40

202 × 10

−2

Product data sheet Rev. 03 — 20 March 2008 72 of 107

NXP Semiconductors

TEF6901A

Integrated car radio

8.2.26 Write mode: data byte POWER

[1] The power saving offered by the Standby modes is limited and is not intended to realize an effective

power-down.

8.2.27 Write mode: data bytes RESERVED

[1] Reserved bits may control test options for factory testing.

Table 101. POWER - format of data byte 18h with default setting

7 6 5 4 3 2 1 0

0 STBT STBR 0 0 ASI AST1 AST0

00 110

Table 102. POWER - data byte 18h bit description

[1]

Bit Symbol Description

7 - reserved; 0 = normal operation

6 STBT standby tuner

0 = normal operation

1 = power consumption is reduced by disabling part of the tuner circuit;

radio operation is disabled

5 STBR standby RDS demodulator

0 = normal operation

1 = RDS demodulator in Standby mode

4 and 3 - reserved; 0 = normal operation

2 ASI audio step interpolation

0 = audio step interpolation is disabled

1 = audio step interpolation is enabled

1 and 0 AST[1:0] ASI step time; selection of the audio step interpolation time

00 = 1 ms

01 = 3 ms

10 = 10 ms

11 = 30 ms

Table 103. RESERVED - format of data byte 19h to 1Eh

7 6 5 4 3 2 1 0

00000000

Table 104. RESERVED - data byte 19h to 1Eh bit description

[1]

Bit Symbol Description

7 to 0 - reserved; 0 = normal operation

TEF6901AH/V5S,557

Mfr. #:

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NXP Semiconductors

Description:

Tuners INTEGRATED CAR RADIO

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TEF6901AH/V5S,557

TEF6901AH/V5S,557

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