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參數(shù)資料
| 型號： | TDA9810T |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 接收器 |
| 英文描述： | Multistandard VIF-PLL with QSS-IF and AM demodulator |
| 中文描述： | AM, AUDIO/VIDEO DEMODULATOR, PDSO24 |
| 封裝： | PLASTIC, SO-24 |
| 文件頁數(shù)： | 7/32頁 |
| 文件大?。?/td> | 225K |
| 代理商： | TDA9810T |
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1999 May 07
7
Philips Semiconductors
Product specification
Multistandard VIF-PLL with QSS-IF and
AM demodulator
TDA9810
SIF amplifier and AGC
The sound IF amplifier consists of two AC-coupled
differential amplifier stages. Each differential stage
comprises a controlled feedback network provided by
emitter degeneration.
The SIF AGC detector is related to the SIF input signals
(average level of AM or FM carriers) and controls the SIF
amplifier to provide a constant SIF signal to the AM
demodulator and single reference QSS mixer. The SIF
AGC reaction time is set to ‘slow’ for nominal video
conditions. But with a decreasing VIF amplitude step the
SIF AGC is set to ‘fast’ mode controlled by the VIF AGC
detector. In FM mode this reaction time is also set to ‘fast’
controlled by the standard switch.
Single reference QSS mixer
The single reference QSS mixer is realized by a multiplier.
The SIF amplifier output signal is fed to the single
reference QSS mixer and converted to intercarrier
frequency by the regenerated picture carrier (VCO).
The mixer output signal is fed via a high-pass for
attenuation of the video signal components to the output
pin 10. With this system a high performance hi-fi stereo
sound processing can be achieved.
AM demodulator
The AM demodulator is realized by a multiplier.
The modulated SIF amplifier output signal is multiplied in
phase with the limited (AM is removed) SIF amplifier
output signal. The demodulator output signal is fed via an
integrated low-pass filter for attenuation of the carrier
harmonics to the AF amplifier. This AM output signal can
be muted by using the AM mute switch.
Internal voltage stabilizer and
1
2
V
P
-reference
The bandgap circuit internally generates a voltage of
approximately 1.25 V, independent of supply voltage and
temperature. A voltage regulator circuit, connected to this
voltage, produces a constant voltage of 3.6 V which is
used as an internal reference voltage.
For all audio output signals the constant reference voltage
cannot be used because large output signals are required.
Therefore these signals refer to half the supply voltage to
achieve a symmetrical headroom, especially for the
rail-to-rail output stage. For ripple and noise attenuation
the
1
2
V
P
voltage has to be filtered via a low-pass filter by
using an external capacitor together with an integrated
resistor (f
3dB
= 5 Hz). For a fast setting to
1
2
V
P
an internal
start-up circuit is available.
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| TDA9811 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Multistandard VIF-PLL with QSS-IF and AM demodulator |
| TDA9812 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Multistandard VIF-PLL and FM-PLL/AM demodulator |
| TDA9812T | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Multistandard VIF-PLL and FM-PLL/AM demodulator |
| TDA9813T | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:VIF-PLL with QSS-IF and dual FM-PLL demodulator |
| TDA9814 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Multistandard VIF-PLL with QSS-IF and dual FM-PLL/AM demodulator |
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