TDA6509 datasheet(22/42 Pages) PHILIPS

22 / 42 page

2005 Mar 25

Philips Semiconductors

Product speciﬁcation

3-band mixer/oscillator and PLL for

terrestrial tuners

TDA6508; TDA6508A;

TDA6509; TDA6509A

13 TEST AND APPLICATION INFORMATION

mdb265

signal

source

Vi(meas)

D.U.T.

LOW_RFIN

GND

IFAMP_OUT1

IFAMP_OUT2

Ω

Vo(meas)

2 x 5

turns

RMS

voltmeter

spectrum

analyzer

N1/N2 = 5

Fig.10 Gain measurement in the LOW-band of the TDA6508; TDA6509.

Zi >> 50 Ω⇒ Vi =2 × Vi(meas) =80dBµV.

Vi =Vi(meas) +6dB =80dBµV.

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

Gv = 20 log

PAL fIF = 36.15 MHz.

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handbook, full pagewidth

MDB266

Ω

LOW_RFIN

IFAMP_OUT1

Vi(meas)

RMS

voltmeter

spectrum

analyzer

Vo(meas)

D.U.T.

signal

source

Fig.11 Gain measurement in the LOW-band of the TDA6508A; TDA6509A.

Zi >> 50 Ω⇒ Vi =2 × Vi(meas) =80dBµV.

Vi =Vi(meas) +6dB =80dBµV.

Vo =Vo(meas) + 3.75 dB.

Gv = 20 log

PAL fIF = 36.15 MHz.

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