TDA6500TT Datasheet, PDF (18/40 Pages) NXP Semiconductors – 5 V mixer/oscillator and synthesizer for PAL and NTSC standards

Philips Semiconductors
5 V mixer/oscillator and synthesizer
for PAL and NTSC standards
Product specification
TDA6500TT; TDA6501TT
4. Limits are related to the tank circuits used in Fig.16 for a PAL application. The choice of different external
components adapts the measurement circuit to other frequency bands or NTSC applications.
5. The frequency shift is defined as a change in oscillator frequency when the supply voltage varies from
V_CC = 5 to 4.75 V (4.5 V) or from V_CC = 5 to 5.25 V (5.5 V). The oscillator is free running during this measurement.
6. The frequency drift is defined as a change in oscillator frequency when the ambient temperature varies from
T_amb = 25 to 50 °C or from T_amb = 25 to 0 °C. The oscillator is free running during this measurement.
7. 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.
8. (N + 5) − 1 MHz pulling is the input level of channel N + 5, at frequency 1 MHz lower, causing FM sidebands 30 dB
below the wanted carrier.
9. The supply ripple susceptibility is measured in the circuit according to Fig.16 using a spectrum analyser connected
to the IF output. An unmodulated RF signal is applied to the test board RF input. A sinewave signal with a frequency
of 500 kHz is superimposed onto the supply voltage. The amplitude of this ripple signal is adjusted to bring the
500 kHz sidebands around the IF carrier to a level of −53.5 dB with respect to the carrier.
10. This is the level of divider interferences close to the IF. For example channel S3: f_osc = 158.15 MHz,
1_{⁄4fosc = 39.5375 MHz. The LOSCIN input must be left open (i.e. not connected to any load or cable); the HOSCIN1}
and HOSCIN2 inputs are connected to a hybrid.
11. 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 dBµV.
12. The reference frequency rejection is the level of reference frequency sidebands (e.g. 62.5 kHz) related to the carrier.
The rejection has to be greater than 60 dB for an IF output signal of 100 dBµV.
13. The IF output signal stays stable within the range of the f_ref step for a low level RF input up to 120 dBµV. This should
be verified for every channel in the band.
handbook, full pagewidth
1
2
0.5
5
0.2
10
−j
∞
10 5
2
1
0.5
0.2 40 MHz
0
+j
10
140 MHz
5
0.2
2
0.5
1
MCE150
Fig.4 Input admittance (S₁₁) of the low band mixer (40 to 140 MHz); Y_o = 20 mS.
2003 Jun 05
18