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2 / 20 page 1996 Aug 16 2 Philips Semiconductors Product specification 9 V VHF and UHF mixers/oscillators for TV and VCR cable tuners TDA5632; TDA5633 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. 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. The devices provide the designer with the capability to design an economical and physically small cable tuner. The tuner development time can be drastically reduced by using this device. Frequency bands are determined by the external tank circuit. They can be adapted to various standards. QUICK REFERENCE DATA Note 1. The limits are related to the tank circuits used in Fig.10 and the intermediate frequency. Frequency bands may be adjusted by the choice of external components. Another UHF frequency range is available by modifying the tank circuit. The modification enables the following frequency range: a) RF frequencies from 361.25 to 801.25 MHz (picture carrier). b) Oscillator frequencies from 407 to 847 MHz. For this UHF range, L4 = 3 turns (diameter = 3.5 mm). SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT VP supply voltage − 9.0 − V IP supply current − 40 − mA fRF frequency range (picture carrier) RF input; band A; note 1 57.5 − 357.5 MHz RF input; band C; note 1 469.5 − 887.5 MHz Gv voltage gain band A (75 Ω load) − 19 − dB band C (75 Ω load) − 30 − dB NF noise figure band A (75 Ω load) − 10 − dB band C (75 Ω load) − 9.5 − dB Vo output voltage to obtain 1% cross modulation in channel band A (75 Ω load) − 110 − dB µV band C (75 Ω load) − 110 − dB µV |
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