TDA6509 datasheet(29/42 Pages) PHILIPS

29 / 42 page

2005 Mar 25

Philips Semiconductors

Product speciﬁcation

3-band mixer/oscillator and PLL for

terrestrial tuners

TDA6508; TDA6508A;

TDA6509; TDA6509A

handbook, full pagewidth

MDB256

Ω

HIGH_RFIN1

HIGH_RFIN2

IFAMP_OUT1

D.U.T.

NOISE

SOURCE

NOISE

FIGURE

METER

Ω

HYBRID

Fig.24 Noise figure measurement in the HIGH-band of the TDA6508A; 6509A.

Hybrid loss = 1 dB.

NF = NFmeas − hybrid loss.

handbook, full pagewidth

unwanted

signal

source

Ω

wanted

signal

source

Ω

MDB251

D.U.T.

HIGH_RFIN1

HIGH_RFIN2

IFAMP_OUT1

IFAMP_OUT2

18 dB

attenuator

Ω

N1/N2 = 5

2 x 5

turns

FILTER

38.9 MHz

modulation

analyzer

HYBRID

RMS

voltmeter

Vo(meas)

AM = 30%

Fig.25 Cross-modulation measurement in the HIGH-band of the TDA6508; TDA6509.

Vo =Vo(meas) + 15 dB (transformer ratio N1/N2 and transformer loss).

Wanted output signal at picture carrier frequency fRF(w); Vo(w) = 110 dBµV.

Unwanted output signal at sound sub-carrier frequency fRF(u); AM = 30%; AF = 2 kHz.

Measuring the level of unwanted signal causing 0.3% AM in the wanted signal.

fRF(w) = 439.25 MHz (min.); 863.25 MHz (max.).

fRF(u) = 444.75 MHz (min.); 868.75 MHz (max.).

fosc = 478.15 MHz (min.); 902.15 MHz (max.).

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