Multi-mode Qam Demodulator

Figure 3 shows the application of the TDA8046 multi-mode QAM Demodulator The frequency of the IF signal (IFQAM) is down converted to a frequency that equals the symbol rate (rs) by a mixer which is driven from a local Oscillator with a frequency of fCAR =fIF +rs. After low pass filtering this baseband signal is applied to an external 8 or 9-bit ADC For 256-QAM, a 9-bit ADC is preferred, for the other modes an 8-bit ADC is sufficient. The multi-mode QAM Demodulator has digital detectors for AGC, Carrier recovery and Clock recovery. The on-chip DACs translate the detector values to Analog control currents which are then integrated by a loop Filter To perform this loop filtering, an Operational Amplifier is integrated after each DAC By NXP Semiconductors
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TDA8046 Pinout, Pinouts
TDA8046 pinout,Pin out
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