TDA9880 datasheet(7/40 Pages) PHILIPS

부품명	TDA9880

상세설명	Alignment-free multistandard vision and FM sound IF-PLL demodulator

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제조업체	PHILIPS [NXP Semiconductors]

홈페이지	http://www.nxp.com

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7 / 40 page

1999 Jul 21

7

Philips Semiconductors

Product speciﬁcation

Alignment-free multistandard vision and

FM sound IF-PLL demodulator

TDA9880

FUNCTIONAL DESCRIPTION

Figure 1 shows the simplified block diagram of the

integrated circuit. The integrated circuit comprises the

following functional blocks:

1. VIF amplifier

2. Tuner-AGC and VIF-AGC

3. VIF-AGC detector

4. Frequency Phase-Locked Loop (FPLL) detector

5. VCO and Travelling Wave Divider (TWD)

6. Digital acquisition help and AFC

7. Video demodulator and amplifier

8. Sound carrier trap

9. Intercarrier mixer

10. FM demodulator and acquisition help

11. Audio amplifier

12. Internal voltage stabilizer.

VIF ampliﬁer

The VIF amplifier consists of three AC-coupled differential

amplifier stages. Each differential stage comprises a

feedback network controlled by emitter degeneration.

Tuner-AGC and VIF-AGC

The AGC capacitor voltage is converted to an internal VIF

gain control signal, and is fed to the tuner AGC to generate

the tuner AGC output current at pin TAGC (open-collector

output). The tuner AGC takeover point can be adjusted

with RTOP. This allows the tuner to be matched to the SAW

filter in order to achieve the optimum IF input level.

VIF-AGC detector

The AGC detector generates the required VIF gain control

voltage for constant video output by charging or

discharging the AGC capacitor. Gain control is performed

by sync level detection. The newly developed AGC circuit

provides fast reaction time to cope with ‘aeroplane

fluttering’. The time constants for decreasing or increasing

gain are nearly equal.

Frequency Phase-Locked Loop (FPLL) detector

The VIF amplifier output signal is fed into a Frequency

Detector (FD) and into a Phase Detector (PD) via a limiting

amplifier. During acquisition the frequency detector

produces a DC current proportional to the frequency

difference between the input and the VCO signal.

After frequency lock-in the phase detector produces a DC

current proportional to the phase difference between the

VCO and the input signal. The DC current of either the

frequency detector or the phase detector is converted into

a DC voltage via the VIF-PLL filter, which controls the VCO

frequency.

VCO and Travelling Wave Divider (TWD)

The Resistor Capacitor (RC) VCO operates as an

integrated relaxation oscillator at double the picture carrier

frequency. The control voltage required to tune the VCO to

actually double the picture carrier frequency is generated

by the FPLL detector and fed via the loop filter to the VCO

control input terminal.

The oscillator signal is divided-by-two with a TWD which

generates two differential output signals with a 90 degrees

phase difference independent of the frequency.

Digital acquisition help and AFC

The integrated relaxation oscillator has a very wide

frequency range from approximately 30 to 70 MHz (after

the TWD). To prevent false locking of the FPLL and with

respect to the catching range of the frequency detector of

maximum

±2.5 MHz, the Digital Acquisition Help (DAH)

provides current into the loop filter until the VCO is in a

frequency window of

±2.3 MHz around the wanted VIF

frequency. In this case the analog operating FPLL will lock

the VCO to the VIF carrier and the acquisition help does

not provide any current to the loop filter.

The principle of the digital acquisition help is as follows:

the VCO is connected to a downcounter, which is preset

depending on the required VIF frequency. The counting

time, as well as the counter control, is derived from a

4 MHz reference signal. This signal can be supplied from

the internal 4 MHz crystal oscillator or from the 4 MHz

reference oscillator of an external tuning system.

The counting result after a counting cycle corresponds to

the actual VCO frequency.

The digital AFC is also derived from the counting result

after a counting cycle by digital-to-analog converting the

last four bits of the counter.

Video demodulator and ampliﬁer

The video demodulator is realized by a multiplier which is

designed for low distortion and large bandwidth. The vision

IF input signal is multiplied with the ‘in phase’ signal of the

travelling wave divider output.

유사한 부품 번호 - TDA9880

제조업체	부품명	데이터시트	상세설명
NXP Semiconductors	TDA9881	226Kb / 42P	Alignment-free vision and FM sound IF PLL demodulator for negative modulated TV standards Rev. 01-16 November 2004
	TDA9881HN	226Kb / 42P	Alignment-free vision and FM sound IF PLL demodulator for negative modulated TV standards Rev. 01-16 November 2004
	TDA9881TS	226Kb / 42P	Alignment-free vision and FM sound IF PLL demodulator for negative modulated TV standards Rev. 01-16 November 2004
	TDA9882	236Kb / 45P	Alignment-free multistandard vision and QSS FM sound IF PLL demodulator Rev. 01-16 November 2004
	TDA9882HN	236Kb / 45P	Alignment-free multistandard vision and QSS FM sound IF PLL demodulator Rev. 01-16 November 2004

More results

유사한 설명 - TDA9880

제조업체	부품명	데이터시트	상세설명
NXP Semiconductors	TDA9882	236Kb / 45P	Alignment-free multistandard vision and QSS FM sound IF PLL demodulator Rev. 01-16 November 2004
	TDA9881	226Kb / 42P	Alignment-free vision and FM sound IF PLL demodulator for negative modulated TV standards Rev. 01-16 November 2004
	TDA9887	308Kb / 58P	I2C-bus controlled multistandard alignment-free IF-PLL demodulator with FM radio 2004 Aug 25
	TDA9887TS	232Kb / 58P	I2C-bus controlled multistandard alignment-free IF-PLL demodulator with FM radio 2004 Aug 25
	TDA9819	267Kb / 40P	Multistandard vision and sound-IF PLL with DVB-IF processing 1998 Jul 14
	TDA9816M	286Kb / 44P	Multistandard multimedia IF-PLL and FM radio demodulator 1997 Nov 19
	TDA9806	193Kb / 24P	Multistandard VIF-PLL and FM-PLL demodulator 1995 Sep 05
	TDA9802	196Kb / 23P	Multistandard VIF-PLL demodulator and FM-PLL detector November 1992
	TDA9812	272Kb / 32P	Multistandard VIF-PLL and FM-PLL/AM demodulator 1995 Mar 21
	TDA9814T	249Kb / 36P	Multistandard VIF-PLL with QSS-IF and dual FM-PLL/AM demodulator 1998 Feb 09

More results

TDA9880 데이터시트(PDF) 7 Page - NXP Semiconductors

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유사한 부품 번호 - TDA9880

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