TDA6509ATT datasheet(18/42 Pages) PHILIPS

18 / 42 page

2005 Mar 25

Philips Semiconductors

Product speciﬁcation

3-band mixer/oscillator and PLL for

terrestrial tuners

TDA6508; TDA6508A;

TDA6509; TDA6509A

Notes

1. The range of fRF is defined by the range of fosc and I; fpc = picture carrier frequency.

2. Vi is the level of fRF (100% amplitude modulated with 11.89 kHz) that causes the frequency of the oscillator signal to

deviate by 750 Hz; it produces sidebands 30 dB below the level of the oscillator signal.

3. Limits are related to the tank circuits used in Fig.27; frequency bands may be adjusted by the choice of external

components.

4. The oscillator frequency shift is defined as a change in oscillator frequency when the supply voltage varies from

VCC = 5 V to 4.75 V (or 5 V to 4.5 V) or from VCC = 5 V to 5.25 V (or 5 V to 5.5 V). The oscillator is free running

during this measurement.

5. The oscillator frequency drift is defined as a change in oscillator frequency when the ambient temperature varies from

Tamb =25 °Cto50 °C (60 °C max.) or from Tamb =25 °Cto0 °C. The oscillator is free running during this

measurement. For

∆T= ±25 °C measurements, the tank circuit has temperature compensated values;

for

∆T=35 °C measurements, the tank circuit has non-temperature compensated values.

6. The ripple susceptibility is measured with a 500 kHz ripple signal applied to the supply voltage. The level of the ripple

signal is increased until a difference of 53.5 dB occurs between the level of the IF carrier, fixed at 110 dB

µV for

TDA6508; TDA6509 or 100 dB

µV for TDA6508A; TDA6509A, and the sideband components.

7. FM modulation of the local oscillator resulting from I2C-bus communication is measured at the IF output using a

modulation analyzer with a peak-to-peak detector and a post detection filter of 20 Hz to 100 kHz. I2C-bus messages

sent to the tuner address the tuner without changing the contents of the PLL registers. The maximum I2C-bus clock

rate is 400 kHz. The I2C-bus pull-up resistor values are 1.5 k

Ω.

FMmod

FM modulation caused by

I2C communication

worst case; note 7

−−

3.0

kHz

WEAK SIGNAL BOOSTER

∆Gv(WSB)

gain increase when the

weak signal booster mode is

activated

TDA6508; TDA6509;

IF = 36.15 MHz

−

TDA6508A; TDA6509A;

IF = 36.15 MHz

710

−

IF PREAMPLIFIER

fO(IF)

IF operational frequency

MHz

output impedance

(RS + jωLS)

TDA6508; TDA6509

RS at 36.15 MHz

−

100

−Ω

LS at 36.15 MHz

−

TDA6508A; TDA6509A

RS at 36.15 MHz

−

−Ω

LS at 36.15 MHz

−

REJECTION AT THE IF OUTPUT

INTdiv

level of divider interferences

in the IF signal

worst case; note 8

−

µV

IRxtal

crystal oscillator

interferences rejection

worst case in the frequency range;

note 9

−

dBc

Rref

reference frequency

rejection

worst case in the frequency range;

fref = 62.5 kHz; note 10

−

dBc

INTSO2

channel SO2 beat

Vpc =80dBµV; note 11

−

dBc

SYMBOL

PARAMETER

CONDITIONS

MIN.

TYP.

MAX.

UNIT

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