TDA6502 datasheet(21/44 Pages) PHILIPS

21 / 44 page

2000 Mar 16

Philips Semiconductors

Preliminary speciﬁcation

5 V mixers/oscillators and synthesizers for

cable TV and VCR 2-band tuners

TDA6502; TDA6502A;

TDA6503; TDA6503A

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

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

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

Tamb =25to50 °C or from Tamb =25to0 °C. The oscillator is free running during this measurement.

6. Switch-on drift is defined as the change in oscillator frequency between 5 s and 15 min after switch-on. The oscillator

is free running during this measurement.

7. The ripple susceptibility is measured for a 500 kHz ripple at the IF output using the measurement circuit of Fig.19;

the level of the ripple signal is increased until a difference of 53.5 dB occurs between the IF carrier fixed at 100 dB

µV

and the sideband components.

8. This is the level of divider interferences close to the IF frequency. For example channel C: fOSC = 179 MHz,

⁄4 fOSC = 44.75 MHz. The VHFIN input must be left open (i.e. not connected to any load or cable); The UHFIN1 and

UHFIN2 inputs are connected to a hybrid.

9. Crystal oscillator interference means the 4 MHz sidebands caused by the crystal oscillator. The rejection has to be

greater than 60 dB for an IF output signal of 100 dB

µV.

10. The reference frequency rejection is the level of reference frequency sidebands related to the sound sub-carrier.

11. Channel 6 beat is the interfering product of fRF(pix) +fRF(snd) − fOSC of channel 6 at 42 MHz.

12. Channel A-5 beat is the interfering product of fRF(pix), fIF and fOSC of channel A-5: fbeat = 45.5 MHz.

The possible mechanisms are: fOSC − 2 × fIF or 2 × fRF(pix) − fOSC. For the measurement: VRF =80dBµV.

handbook, full pagewidth

FCE528

0.2

0.5

0.2

0.5

+ j

− j

0.2

0.5

40 MHz

400 MHz

∞

Fig.7 Input admittance (S11) of the VHF mixer input (40 to 400 MHz); Y0 = 20 mS.

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