TDA8046H datasheet(8/48 Pages) PHILIPS

Nome de Peças	TDA8046H

Descrição Electrónicos	Multi-mode QAM demodulator

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Fabricante Electrônico	PHILIPS [NXP Semiconductors]

Página de início	http://www.nxp.com

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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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