TDA5745 datasheet(8/20 Pages) PHILIPS

8 / 20 page

1998 Mar 09

Philips Semiconductors

Preliminary speciﬁcation

Low power mixers/oscillators for

hyperband tuners

TDA5744; TDA5745

Notes

1. This is the level of the RF signal (100% amplitude modulated with 11.89 kHz) that causes a 750 Hz frequency

deviation on the oscillator signal; it produces sidebands 30 dB below the level of the oscillator signal.

2. The frequency shift is defined as the change of the oscillator frequency when the supply voltage varies from

VCC = 5 to 4.5 V or from VCC = 5 to 5.25 V. The oscillator is free-running during this measurement.

3. The frequency drift is defined as the change of the oscillator frequency when the ambient temperature varies from

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

4. The switching on drift is defined as the change of the oscillator frequency between 5 seconds and 15 minutes after

switching on. The oscillator is free-running during this measurement.

5. The ripple susceptibility is measured for a 500 kHz ripple at the IF amplifier output using the measurement circuit;

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

µV and the

sideband components is reached.

6. Channel x beat: picture carrier frequency (fpc) and sound carrier frequency (fsc) both at 80 dBµV.

The rejection of the interfering product fpc(RF) +fsc(RF) − fosc at 35.35 MHz should be >60 dB.

7. Channel S02: fpc is 76.25 MHz at 70 dBµV; fosc = 115.15 MHz.

The rejection of fosc − 2 × fIF = 37.35 MHz should be >66 dB.

UHF oscillator

fosc

oscillator frequency

446.15

−

894.15 MHz

∆f

osc(V)

oscillator frequency shift

with supply voltage

∆VCC = 5%; note 2

−

kHz

∆V

CC = 10%; worst case in the

frequency range; note 2

−

tbf

kHz

∆f

osc(T)

oscillator frequency drift

with temperature

∆T=25 °C; with compensation; worst

case in the frequency range; note 3

−

600

tbf

kHz

∆fosc(t)

oscillator frequency drift

with time

worst case in the frequency range;

note 4

−

200

tbf

kHz

osc

phase noise,

carrier-to-noise sideband

±100 kHz frequency offset; worst case

in the frequency range

−

106

−

dBc/Hz

RSC(p-p)

ripple susceptibility of VCC

(peak-to-peak value)

VCC = 5 V; worst case in the frequency

range; ripple frequency 500 kHz; note 5

−

Rejection at the IF ampliﬁer output

INTCHX

channel x beat

note 6

−−

dBc

INTS02

S02 beat

note 7

−−

dBc

SYMBOL

PARAMETER

CONDITIONS

MIN.

TYP.

MAX.

UNIT

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