TDA6509 datasheet(19/42 Pages) PHILIPS

19 / 42 page

2005 Mar 25

Philips Semiconductors

Product speciﬁcation

3-band mixer/oscillator and PLL for

terrestrial tuners

TDA6508; TDA6508A;

TDA6509; TDA6509A

8. This is the level of signals close to the IF frequency which can interfere with the dividers. Typical interference signals

are channel S3: fosc = 256.15 MHz, 5⁄32 fosc = 40.02 MHz. The LOW and MID RF inputs must not be connected to

any load or cable; the HIGH RF inputs are connected to a hybrid (balun).

9. Crystal oscillator interference is the 4 MHz sidebands produced by the crystal oscillator. The rejection must be

greater than 60 dB for an IF output signal of 110 dB

µV for versions TDA6508; TDA6509 or 100 dBµV for versions

TDA6508A; TDA6509A.

10. Reference frequency rejection measures the level of reference frequency sidebands with respect to the sound

sub-carrier fssc.

11. Channel SO2 beat is the interfering product of the picture carrier frequency fpc, fIF and fOSC in channel SO2:

fBEAT =fosc − 2 × fIF = 37.35 MHz. Another possible mechanism is: 2 × fpc − fosc. For the measurement,

VRF =80dBµV.

handbook, full pagewidth

MDB220

0.5

∞

+ j

− j

43.25 MHz

161.25 MHz

0.5

Fig.5 Input admittance (S11) of the LOW band mixer (43.25 to 161.25 MHz); YO =20mS.

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