TDA6402 Datasheet, PDF (20/40 Pages) NXP Semiconductors – 5 V mixers/oscillators and synthesizers for cable TV and VCR 2-band tuners

Philips Semiconductors
5 V mixers/oscillators and synthesizers for
cable TV and VCR 2-band tuners
Product specification
TDA6402; TDA6402A;
TDA6403; TDA6403A
5. 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. The VHF drift
value can be improved by adding a 10 kΩ resistor between the VHFOSCOC pin and the V_CC. In that case the typical
VHF drift value can be reduced to 900 kHz.
6. 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.
7. The ripple susceptibility is measured for a 500 kHz ripple at the IF output using the measurement circuit of Fig.19;
the level of the ripple signal is increased until a difference of 53.5 dB occurs between the IF carrier fixed at 100 dBµV
and the sideband components.
8. This is the level of divider interferences close to the IF frequency. For example channel C: f_OSC = 179 MHz,
1_{⁄4 fOSC = 44.75 MHz. Divider interference is measured with the Philips 37185 demonstration board in accordance}
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.
9. 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.
10. The reference frequency rejection is the level of reference frequency sidebands related to the sound sub-carrier.
The rejection has to be greater than 50 dB for an IF output signal of 100 dBµV.
11. Channel 6 beat is the interfering product of f_RFpix + f_RFsnd − f_OSC of channel 6 at 42 MHz.
12. Channel A-5 beat is the interfering product of f_RFpix, f_IF and f_OSC of channel A-4; f_BEAT = 45.5 MHz. The possible
mechanisms are: f_OSC − 2 × f_IF or 2 × f_RFpix − f_OSC. For the measurement V_RF = 80 dBµV.
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
400 MHz
5
0.2
2
0.5
1
MGE722
Fig.9 Input admittance (S₁₁) of the VHF mixer input (40 to 400 MHz); Y₀ = 20 mS.
2000 Jan 24
20