TDA9881 datasheet(7/42 Pages) NXP

부품명	TDA9881

상세설명	Alignment-free vision and FM sound IF PLL demodulator for negative modulated TV standards

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9397 750 13417

Product data sheet

Rev. 01 — 16 November 2004

7 of 42

Philips Semiconductors

TDA9881

Alignment-free vision and FM sound IF PLL demodulator

8.

Functional description

A simpliﬁed block diagram of the device is illustrated in Figure 1. The device contains 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 divider

6. AFC and digital acquisition help circuit

7. Video demodulator and ampliﬁer

8. Sound carrier trap

9. SIF ampliﬁer

10.SIF AGC detector

11.Single reference QSS mixer

12.FM demodulator and acquisition help circuit

13.Audio ampliﬁer and mute time constant

14.Internal voltage stabilizer

15.Logic.

8.1 VIF ampliﬁer

The VIF ampliﬁer consists of three AC-coupled differential stages. Gain control is

performed by emitter degeneration. The total gain control range is typical 66 dB. The

differential input impedance is typical 2 k

Ω in parallel with 3 pF.

8.2 Tuner AGC and VIF AGC

This block adapts the voltage, generated at the VIF AGC detector, to the internal signal

processing at the VIF ampliﬁer and performs the tuner AGC control current generation.

The onset of the tuner AGC control current generation can be set by a potentiometer at

pin TOP.

8.3 VIF AGC detector

Gain control is performed using sync level detection.

The sync level voltage is stored in an integrated capacitor by means of a fast peak

detector. This voltage is compared with a reference voltage (nominal sync level) by a

comparator which charges or discharges the integrated AGC capacitor to generate the

VIF gain. The time constants for decreasing or increasing the gain are nearly equal and

the total AGC reaction time is fast, to cope with ‘aeroplane ﬂuttering’.

유사한 부품 번호 - TDA9881

제조업체	부품명	데이터시트	상세설명
NXP Semiconductors	TDA9880	195Kb / 40P	Alignment-free multistandard vision and FM sound IF-PLL demodulator 1999 Jul 21
	TDA9880T	195Kb / 40P	Alignment-free multistandard vision and FM sound IF-PLL demodulator 1999 Jul 21
	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
	TDA9882TS	236Kb / 45P	Alignment-free multistandard vision and QSS FM sound IF PLL demodulator Rev. 01-16 November 2004

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유사한 설명 - TDA9881

제조업체	부품명	데이터시트	상세설명
NXP Semiconductors	TDA9880	195Kb / 40P	Alignment-free multistandard vision and FM sound IF-PLL demodulator 1999 Jul 21
NXP Semiconductors	TDA9882	236Kb / 45P	Alignment-free multistandard vision and QSS FM sound IF PLL demodulator Rev. 01-16 November 2004
TEMIC Semiconductors	U828B	84Kb / 5P	FM IF AMPLIFIER AND DEMODULATOR FOR TV SOUND APPLICATION
NXP Semiconductors	TDA9887	308Kb / 58P	I2C-bus controlled multistandard alignment-free IF-PLL demodulator with FM radio 2004 Aug 25
NXP Semiconductors	TDA9887TS	232Kb / 58P	I2C-bus controlled multistandard alignment-free IF-PLL demodulator with FM radio 2004 Aug 25
TEMIC Semiconductors	U2861B	263Kb / 11P	Mono FM Sound Demodulator for TV Systems
Siemens Semiconductor G...	TDA5950X	450Kb / 11P	Video and Sound IF with FM-PLL Demodulator, AFC and V & S SCART
TEMIC Semiconductors	U2860BB	417Kb / 11P	Dual-Channel FM Sound Demodulator for TV Systems
ATMEL Corporation	U2860B-M	336Kb / 14P	Dual-Channel FM Sound Demodulator for TV Systems
STMicroelectronics	TDA8192	44Kb / 5P	MULTISTANDARD AM AND FM SOUND IF CIRCUIT FOR TV

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