TEF6862_15 datasheet(10/65 Pages) PHILIPS

Part #	TEF6862

Description	Car Radio Enhanced Selectivity Tuner (CREST)

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Manufacturer	PHILIPS [NXP Semiconductors]

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10 / 65 page

TEF6862_1

Product data sheet

Rev. 01 — 14 September 2006

10 of 65

Philips Semiconductors

TEF6862

Car Radio Enhanced Selectivity Tuner (CREST)

7.18 AM IF AGC ampliﬁer and demodulator

The 450 kHz IF2 signal after the ceramic channel selection ﬁlter is ampliﬁed by the

IF AGC ampliﬁer and demodulated. Instead of the demodulated AM audio signal, also the

IF2 signal can be selected on the MPXAM output pin. This IF2 signal can be used for an

external AM stereo decoder. To avoid overdrive of the input stage a detector at the input

drives the RF AGC.

7.19 AM level detection

The IF2 signal used for AM IF AGC and demodulation is also used in the limiter circuit for

in-band level detection to generate a level voltage.

7.20 AM and FM level DAA

The start and slope of the level detector output are programmable with 5 bits and 3 bits

respectively to achieve level information independent on gain variations in the signal

channel.

7.21 AM and FM IF counter

The output signal from the limiters is used for IF counting in both AM and FM. The

IF count time is automatically controlled to achieve the optimum counting accuracy. The

minimum count time is 2 ms.

8.

I2C-bus protocol

Fig 3.

Write mode

ACK-s

DATA

SLAVE ADDRESS W

data transferred

(n bytes

+ acknowledge)

001aad051

P

S

ACK-s

MSA

Fig 4.

Read mode

DATA

ACK-s

ACK-m

DATA

NA

SLAVE ADDRESS R

001aad049

P

S

data transferred

(n

− 1 bytes + acknowledge)

Table 4.

Description of I2C-bus format

Code

Description

S

START condition

Slave address W

1100 0000b for pin ADDR grounded

1100 0010b for pin ADDR ﬂoating

Slave address R

1100 0001b for pin ADDR grounded

1100 0011b for pin ADDR ﬂoating

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