GENERAL DESCRIPTION
The TDA6404, TDA6405 and TDA6405A are programmable 2-band mixer/oscillator-PLL synthesizers intended for VHF/UHF and hyperband tuners (see Fig.1).
The devices include two double balanced mixers and two oscillators for the VHF and UHF band, an IF amplifier and a PLL synthesizer. With proper oscillator application and by using a switchable inductor to split the VHF band into two sub-bands (the full VHF/UHF and hyperband) the TV bands can be covered.

FEATURES
• Single chip 5 V mixer/oscillator-PLL synthesizer for hyperband tuners
• I2C-bus protocol
• 3 PNP band switch buffers (25 mA)
• 33 V tuning voltage output
• In-lock detector
• 5-level Analog-to-Digital Converter (ADC)
• 15-bit programmable divider
• Programmable reference divider ratio(512, 640 or 1024)
• Programmable charge pump current
• Balanced mixer with a common emitter input for VHF (single input)
• Balanced mixer with a common base input for UHF (double input)
• 4-pin common emitter oscillator for VHF
• 4-pin common emitter oscillator for UHF
• IF amplifier with a low output impedance to drive a SAW filter directly (≈2 kΩ load)
• Low power, low radiation, small size

APPLICATIONS
• Hyperband tuners for Europe using a 2-band mixer/oscillator in a switched concept.