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TDA8046H Folha de dados(PDF) 8 Page - NXP Semiconductors |
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TDA8046H Folha de dados(HTML) 8 Page - NXP Semiconductors |
8 / 48 page 1996 Nov 19 8 Philips Semiconductors Product specification Multi-mode QAM demodulator TDA8046 7 FUNCTIONAL DESCRIPTION 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. The carrier recovery consists of a two-loop system. The outer loop is shown in Fig.3, and controls both phase and frequency at a low speed. The inner loop controls the carrier phase at a high speed (wide loop bandwidth). The AGC also consists of two loops; the outer loop is the coarse AGC and one inner loop is the fine AGC. The recovered symbols are converted into bits according to a demapping scheme and represented at the output in an 8-bit parallel output format. The QAM demodulator can be initialized and monitored by the I2C-bus interface. Fig.3 Application with multi-mode QAM demodulator. handbook, full pagewidth MGG167 LPF ADC fCAR = fIF + rs clock recovery carrier recovery AGC DO7 to DO0 CLKOUT CLKSDV 8 or 9 bits IFQAM SAW TUNER RF signal fclk TDA8046 I2C-BUS |
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