TDA6402 datasheet(20/40 Pages) PHILIPS

20 / 40 page

2000 Jan 24

Philips Semiconductors

Product speciﬁcation

5 V mixers/oscillators and synthesizers for

cable TV and VCR 2-band tuners

TDA6402; TDA6402A;

TDA6403; TDA6403A

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. The VHF drift

value can be improved by adding a 10 k

Ω resistor between the VHFOSCOC pin and the VCC. In that case the typical

VHF drift value can be reduced to 900 kHz.

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. Divider interference is measured with the Philips 37185 demonstration board in accordance

with Fig.19. All ground pins are connected to a single ground plane under the IC. 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.

The measured levels of divider interference are influenced by layout, grounding and port decoupling.

The measurement results could vary by as much as 10 dB with respect to the specification.

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.

The rejection has to be greater than 50 dB for an IF output signal of 100 dB

µV.

11. Channel 6 beat is the interfering product of fRFpix +fRFsnd − fOSC of channel 6 at 42 MHz.

12. Channel A-5 beat is the interfering product of fRFpix, fIF and fOSC of channel A-4; fBEAT = 45.5 MHz. The possible

mechanisms are: fOSC − 2 × fIF or 2 × fRFpix − fOSC. For the measurement VRF =80dBµV.

Fig.9 Input admittance (S11) of the VHF mixer input (40 to 400 MHz); Y0 = 20 mS.

handbook, full pagewidth

MGE722

0.2

0.5

0.2

0.5

∞

+ j

– j

0.2

0.5

40 MHz

400 MHz

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