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TEA6848H

New In Car Entertainment car radio tuner IC with Precision Adjacent Channel Suppression (NICE-PACS)

Philips Electronics 

Philips Semiconductors

New In Car Entertainment car radio tuner IC with

Precision Adjacent Channel Suppression (NICE-PACS)

Product specification

TEA6848H

7.6 IF2 filter gain alignment

The 4-bit filter gain alignment reduces the change in

IF filter gain spread when the bandwidth is changed in

dynamic mode from 155 kHz (maximum) to 25 kHz

(minimum).

A frequency has to be chosen in the middle of

European/US FM band, Japan band or OIRT band (for

East Europe) and the IC has to be set into dynamic

bandwidth mode (IF2 bandwidth is 155 kHz).

Setting and clearing the FMBW bit continuously allows the

adjustment of the gain alignment to minimum change in

AM/FM DC level.

7.7 Frequency offset detector/alignment

A very strong undesired neighbouring signal causes offset

in the demodulator in case of weak desired input signal.

The frequency offset detector reduces the bandwidth of

the IF2 filter when the detected offset in the demodulator

is too large.

There are four bits available for frequency offset detector

alignment. Every band has to be aligned separately.

Tuning has to be set to middle of the band, input signal

unmodulated, bit IFBW = 1 (alignment voltage will be

given to pin IFBWFLAG). The DC voltage at

pin IFBWFLAG has to be aligned to the minimum value.

8 LIMITING VALUES

In accordance with the Absolute Maximum Rating System (IEC 60134).

SYMBOL

VDDA1

VDDA2

VDDA3

VDDA4

VDDA5

VDDA6

VDDD

∆VDD8.5-DD5

Tstg

Tamb

Ves

PARAMETER

CONDITIONS MIN.

analog supply voltage 1 for FM IF amplifier

−0.3

analog supply voltage 2 for FM and AM RF

−0.3

analog supply voltage 3 for tuning PLL

−0.3

analog supply voltage 4 for voltage controlled

−0.3

oscillator

analog supply voltage 5 for on-chip power supply

−0.3

analog supply voltage 6 for on-chip power supply

−0.3

digital supply voltage

−0.3

difference between any 8.5 V supply voltage and note 1

−0.3

any 5 V supply voltage

storage temperature

−55

ambient temperature

−40

electrostatic handling voltage

note 2

−200

note 3

−2 000

MAX.

+10

+10

+10

+10

UNIT

V

V

V

V

+6.5

V

+10

V

+6.5

V

−

V

+150

°C

+85

°C

+200

V

+2000 V

Notes

1. To avoid damage and wrong operation it is necessary to keep all 8.5 V supply voltages at a higher level than any 5 V

supply voltage. This is also necessary during power-on and power-down sequences. Precautions have to be

provided in such a way that interference cannot pull down the 8.5 V supply below the 5 V supply.

2. Machine model (R = 0 Ω, C = 200 pF).

3. Human body model (R = 1.5 kΩ, C = 100 pF).

9 THERMAL CHARACTERISTICS

SYMBOL

Rth(j-a)

Rth(j-c)

PARAMETER

thermal resistance from junction to ambient

thermal resistance from junction to case

CONDITIONS

in free air

VALUE

54

9

UNIT

K/W

K/W

2004 Nov 12

11

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