TDA6403M.AM

GENERAL DESCRIPTION

The TDA6402, TDA6402A, TDA6403 and TDA6403A are programmable 2-band mixers/oscillators and synthesizers
intended for VHF/UHF cable tuners (see Fig.1).

FEATURES

• Single-chip 5 V mixer/oscillator and synthesizer for cable TV and VCR tuners
• Synthesizer function compatible with existing TSA5526
• Universal bus protocol (I2C-bus or 3-wire bus)
– Bus protocol for 18 or 19-bit transmission (3-wire bus)
– Extra protocol for 27-bit transmission (test modes and features for 3-wire bus)
– Address + 4 data bytes transmission (I2C-bus ‘write’ mode)
– Address + 1 status byte (I2C-bus ‘read’ mode)
– 4 independent I2C-bus addresses.
• 1 PNP buffer for UHF band selection (25 mA)
• 3 PNP buffers for general purpose, e.g. 2 VHF sub-bands, FM sound trap (25 mA)
• 33 V tuning voltage output
• In-lock detector
• 5-step A/D converter (3 bits in I2C-bus mode)
• 15-bit programmable divider
• Programmable reference divider ratio (512, 640 or 1024)
• Programmable charge pump current (60 or 280µA)
• Programmable automatic charge pump current switch
• Varicap drive disable
• Mixer/oscillator function compatible with existing TDA5732
• Balanced mixer with a common emitter input for VHF (single input)
• Balanced mixer with a common base input for UHF (balanced input)
• 2-pin common emitter oscillator for VHF
• 4-pin common emitter oscillator for UHF
• IF preamplifier with asymmetrical 75Ω output impedance to drive a low-ohmic impedance (75 Ω)
• Low power
• Low radiation
• Small size
• The TDA6402A and TDA6403A differ from the TDA6402 and TDA6403 by the UHF port protocol in the I2C-bus mode (see Tables 3 and 4).

APPLICATIONS

• Cable tuners for TV and VCR (switched concept for VHF)
• 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.