TDA8295

General description

The TDA8295 is an alignment-free digital multistandard vision and sound low IF signal PLL demodulator for positive and negative video modulation including AM and FM mono sound processing. It can be used in all countries worldwide for M/N, B/G/H, I, D/K, L and L-accent standard. CVBS and SSIF/mono audio is provided via two DACs. FM radio preprocessing is included for simple interfacing with demodulator/stereo decoder backends.

The IC is especially suited for the application with the NXP Silicon Tuner TDA8275A or TDA1827x.

All the processing is done in the digital domain.

The chip has an 'easy programming' mode to make the I²C-bus protocol very simple. In principle, only one bit sets the proper standard with recommended content. However, if this is not suitable, free programming is always possible.

Features

• Digital IF demodulation for all analog TV standards worldwide (M/N, B/G/H, D/K, I, L and L-accent standard)
• Multistandard true synchronous demodulation with active carrier regeneration
• Alignment-free
• 16 MHz typical reference frequency input (from low IF tuner) or operating as crystal oscillator
• Internal PLL synthesizer which allows the use of a low-cost crystal (typically 16 MHz)
• Especially suited for the NXP Silicon Tuner TDA8275A or TDA1827x
• No SAW filter needed
• Low application effort and external component count in combination with the TDA8275A or TDA1827x
• Pin compatible with predecessor TDA8290
• Simple upgrade of TDA8290 possible
• 12-bit IF ADC on chip running with 54 MHz or 27 MHz
• Two 10-bit DACs on chip for CVBS and SSIF or audio
• Easy programming for I²C-bus
• High flexibility due to various I²C-bus programming registers
• I²C-bus interface and I²C-bus feed-through for tuner programming
• Four I²C-bus addresses selectable via two external pins
• Gated IF AGC acting on black level by using H/V PLL or peak IF AGC (I²C-bus selectable)
• Internal digital logarithmic IF AGC amplifier with up to 48 dB gain and 68 dB control range
• Peak search tuner IF AGC for optimal adaptive drive of the IF ADC
• Switchable IF PLL and IF AGC loop bandwidths
• Precise AFC and lock detector
• Accurate group delay equalization for all standards
• Very robust IF demodulator coping with adverse field conditions
• Wide PLL pull-in range up to +-1660 kHz (I²C-bus selectable)
• CVBS and SSIF or audio output with simple postfilter (capacitor only)
• CVBS gain levelling stage to provide nearly constant signal amplitude during overmodulation
• Video equalizer with eight settings
• Nyquist filter in video baseband
• Excellent video S/N (typically 62 dB weighted)
• High selectivity video low-pass filter for all standards
• Low video into sound crosstalk
• Sound performance comparable to QSS single reference concepts
• AM/FM mono sound demodulator
• Switchable de-emphasis
• Excellent FM sound
• Good AM sound
• High FM Deviation mode for China
• Preprocessing of FM radio (mono and stereo) with highly selective digital band-pass filter
• No ceramic filter or external components needed for FM radio
• FM radio available in mono
• Automatic or forced mute for mono sound
• Automatic or forced blank for video
• Mostly digital FIR filter implementation (NSC notches and video low-pass filters)
• Three GPIO pins
• Low total power dissipation (typically 324 mW)
• Standby mode (typically 7 mW)
• 40-pin HVQFN package
• CMOS technology (0.12 um 1.2 V and 3.3 V)

Products/packages

Pricing/ordering/availability

Applications

• PC TV applications
• DVD recorders

Technical documents

Support Documents

75015474; Revolutionar y TV tuning solution for analog /digital PC TV (2006-04-01)

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