tda6403a NXP Semiconductors, tda6403a Datasheet - Page 20

• Manufacturer Part Number: tda6403a
• Description: 5 V Mixers/oscillators And Synthesizers For Cable Tv And Vcr 2-band Tuners
• Manufacturer: NXP Semiconductors

Philips Semiconductors
5. The frequency drift is defined as a change in oscillator frequency when the ambient temperature varies from
6. Switch-on drift is defined as the change in oscillator frequency between 5 s and 15 min after switch on. The oscillator
7. The ripple susceptibility is measured for a 500 kHz ripple at the IF output using the measurement circuit of Fig.19;
8. This is the level of divider interferences close to the IF frequency. For example channel C: f
9. Crystal oscillator interference means the 4 MHz sidebands caused by the crystal oscillator. The rejection has to be
10. The reference frequency rejection is the level of reference frequency sidebands related to the sound sub-carrier.
11. Channel 6 beat is the interfering product of f
12. Channel A-5 beat is the interfering product of f
2000 Jan 24
handbook, full pagewidth
5 V mixers/oscillators and synthesizers for
cable TV and VCR 2-band tuners
T
value can be improved by adding a 10 k resistor between the VHFOSCOC pin and the V
VHF drift value can be reduced to 900 kHz.
is free running during this measurement.
the level of the ripple signal is increased until a difference of 53.5 dB occurs between the IF carrier fixed at 100 dB V
and the sideband components.
1
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.
greater than 60 dB for an IF output signal of 100 dB V.
The rejection has to be greater than 50 dB for an IF output signal of 100 dB V.
mechanisms are: f
amb
4
f
OSC
= 25 to 50 C or from T
= 44.75 MHz. Divider interference is measured with the Philips 37185 demonstration board in accordance
Fig.9 Input admittance (S
OSC
2
10
10
amb
f
IF
5
5
or 2
= 25 to 0 C. The oscillator is free running during this measurement. The VHF drift
10
f
2
2
5
RFpix
11
) of the VHF mixer input (40 to 400 MHz); Y
RFpix
f
OSC
RFpix,
2
+ f
. For the measurement V
RFsnd
f
IF
20
and f
1
1
1
f
OSC
OSC
0.5
of channel 6 at 42 MHz.
of channel A-4; f
0.2
0.5
0.5
400 MHz
RF
40 MHz
= 80 dB V.
MGE722
TDA6402; TDA6402A;
TDA6403; TDA6403A
0.2
0.2
BEAT
0
– j
+ j
= 45.5 MHz. The possible
0
= 20 mS.
CC
. In that case the typical
OSC
Product specification
= 179 MHz,