TDA5633T

9V VHF and UHF mixers/oscillators for TV and VCR cable tuners

DESCRIPTION

The TDA5632 and TDA5633 are monolithic integrated circuits that perform VHF and UHF mixer/oscillator functions in TV and VCR cable tuners. With correct oscillator application and by using a switchable inductor to

split the VHF band into two sub-bands, the full VHF/UHF TV bands can be covered. These low-power mixers/oscillators require a power supply of 9 V and are available in a very small package.

FEATURES

• Balanced mixer with a common emitter input for band A

• 2-pin oscillator for band A

• Balanced mixer with a common base input for band C

• 4-pin oscillator for band C

• Local oscillator buffer output for external prescaler

• SAW filter preamplifier with a low output impedance to drive a 75 Ω load

• Band gap voltage stabilizer for oscillator stability

• Electronic band switch

• External IF filter connected between the mixer output and the IF amplifier input.

APPLICATIONS

• Cable tuners for TV and VTR; switched concept for VHF

• Recommended RF bands for Europe:

   48.25 to 105.25 MHz, 112.25 to 294.25 MHz and  471.25 to 855.25 MHz

• Recommended RF bands for the USA:

55.25 to 133.25 MHz, 139.25 to 361.25 MHz and 367.25 to 801.25 MHz.