TDA9809 datasheet(6/40 Pages) PHILIPS

Part #	TDA9809

Description	Single standard multimedia IF-PLL and FM radio demodulator

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Manufacturer	PHILIPS [NXP Semiconductors]

Direct Link	http://www.nxp.com

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6 / 40 page

1998 Jan 08

6

Philips Semiconductors

Preliminary speciﬁcation

Single standard multimedia IF-PLL and FM

radio demodulator

TDA9809M

Frequency Phased-Locked Loop detector (FPLL)

The VIF amplifier output signal is fed, via a limiting

amplifier, to a frequency and phase detector. During

acquisition, the frequency detector generates a DC current

that is proportional to the difference in frequency between

the input signal and the VCO signal.

After frequency lock-in, the phase detector generates a

DC current proportional to the phase difference between

the input signal and the VCO signal. The DC current

generated by the frequency or phase detector is converted

to a DC voltage via the loop filter, which controls the VCO

frequency.

VCO, TWD and TV AFC

The VCO operates with a resonance circuit (with L and C

in parallel) at double the Picture Carrier (PC) frequency.

The VCO is controlled by two integrated variable

capacitors. The control voltage required to tune the VCO

from its free-running frequency to double the PC frequency

is generated by the FPLL and fed via the loop filter to the

first variable capacitor. This control voltage is amplified

and converted into a current which represents the AFC

output signal. At the centre frequency, the AFC output

current is zero.

The TWD divides the oscillator signal by 2 and generates

two differential output signals with a 90

° phase difference

independent of frequency.

Video demodulator and ampliﬁer

Video demodulation is realized by a multiplier designed for

low distortion and wide bandwidth. The vision IF input

signal and the ‘in-phase’ signal of the travelling wave

divider output are multiplied together.

The demodulated output signal is fed to the video amplifier

via an integrated low-pass filter used to attenuate the

carrier harmonics. This is an operational amplifier with

internal feedback and wide bandwidth. A low-pass filter is

integrated to attenuate the carrier harmonics. The video

output signal at Vo(vid) is 1.1 V (p-p) for nominal vision IF

modulation, in order to achieve 1 V (p-p) at the sound trap

output.

Intercarrier mixer

The intercarrier mixer is realized by a multiplier.

The sound IF signal passes through the vision IF SAW

filter and the composite IF signal is then fed to the

intercarrier mixer. Here, the IF signal is multiplied by the

90

° TWD output signal to convert the sound IF to the

intercarrier frequency. By using this quadrature detection,

the low frequency video signals are removed. The mixer

output signal is fed, via a high-pass filter used to attenuate

the video signal components, at output pin 10.

RIF ampliﬁer and AGC detector

The radio IF amplifier amplifies the 10.7 MHz radio IF

signal. This signal is supplied by the tuner and is fed to the

RIF input (pin 4) via a matching circuit and a ceramic

band-pass filter. This amplifier contains two stages.

The first stage, a conventional 0 dB differential amplifier

designed for optimal dynamic range, is followed by a

switchable differential amplifier stage with a gain of 10 dB.

Either the radio IF or the TV IF signal can be selected at

the output (pin 10).

The RIF output signal is fed via ceramic band-pass filters

to the FM-PLL demodulator and the radio IF AGC detector.

The AGC threshold is very high and is designed to obtain

some adjacent channel protection. The AGC detector

output is fed to the tuner AGC output stage (pin 12) to

control the tuner.

FM-PLL demodulator, level detector and radio AFC

The FM-PLL demodulator consists of a limiter and an FM

phase-locked loop. The 8-stage internally AC-coupled

limiter amplifies and limits the TV FM sound intercarrier or

the radio FM intermediate frequency signal prior to

demodulation. The limiter is designed for high sensitivity

and AM suppression with low DC offset and needs no

external pins for DC coupling.

Furthermore, the AF output signal can be force muted by

connecting a resistor between pin 11 and ground. The soft

mute function can be disabled by connecting a resistor

between pin 11 and the power supply. See the application

circuit in Fig.16.

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