TEF6902A datasheet(16/106 Pages) NXP

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TEF6902A_3

Product data sheet

Rev. 03 — 19 March 2008

16 of 106

NXP Semiconductors

TEF6902A

Integrated car radio

8.1.2 Read mode: data byte LEVEL

After AF update sampling the level read value is held (indicated by IFCM = 10) for easy

I2C-bus read-out. The level detector remains active in the background. The LEV data hold

is released after I2C-bus read.

To reduce the inﬂuence of modulation in AM mode the LEV information is additionally

ﬁltered by a slow 60 ms detector. Fast level information is made available during

AF update and check tuning.

For standard operation the following level alignment (byte LEVELALGN; see Table 43) is

used:

FM and AM level slope;

∆LEV = 51 (∆V

LEVEL = 0.80 V) at ∆VRF = 20 dB (measured at

VRF = 200 µV and VRF =20 µV)

FM mode level start; LEV = 78 (VLEVEL = 1.47 V) at VRF =20 µV

AM mode level start; LEV = 63 (VLEVEL = 1.24 V) at VRF =20 µV

Fig 6.

IF counter in FM mode during and after AF update

001aab786

tuning for AF update

2 ms

16 ms

time

I2C-bus

2 ms

4 ms

8 ms

16 ms

32 ms

2 ms

2 ms 2 ms

4 ms

8 ms

hold of counter result of f2 until read-out

read-out of counter result f2

2 ms 2 ms 2 ms 2 ms 2 ms 2 ms 2 ms

2 ms

reset

counter time

reset

Table 9.

LEVEL - format of data byte 1

LEV7

LEV6

LEV5

LEV4

LEV3

LEV2

LEV1

LEV0

Table 10.

LEVEL - data byte 1 bit description

Bit

Symbol

Description

7 to 0

LEV[7:0]

level detector; this byte indicates the LEVEL voltage between

0.25 V (LEV = 0) and 4.25 V (LEV = 255) from the tuner part;

VLEVEL = 1⁄64LEV[7:0] + 0.25 V; see Figure 7

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