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| 型號： | TA2069AF |
| 元件分類： | 音頻控制 |
| 英文描述： | 2 CHANNEL(S), TONE CONTROL CIRCUIT, PDSO24 |
| 封裝： | 0.300 INCH, 1 MM PITCH, PLASTIC, SSOP-24 |
| 文件頁數(shù)： | 4/14頁 |
| 文件大?。?/td> | 298K |
| 代理商： | TA2069AF |
TDA9885_TDA9886_3
NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 03 — 16 December 2008
12 of 56
NXP Semiconductors
TDA9885; TDA9886
I2C-bus controlled multistandard alignment-free IF-PLL demodulators
The QSS mixer output signal is fed internally via a high-pass and low-pass combination to
the FM demodulator as well as via an operational amplier to the intercarrier output
pin SIOMAD.
8.12 AM demodulator
The amplitude modulated SIF amplier output signal is fed both to a two-stage limiting
amplier that removes the AM and to a linear multiplier. The result of the multiplication of
the SIF signal with the limiter output signal is AM demodulation (passive synchronous
demodulator). The demodulator output signal is fed via a low-pass lter that attenuates
the carrier harmonics and through the input amplier of the SIF-AGC detector to the audio
amplier.
8.13 FM demodulator and acquisition help
The narrowband FM-PLL detector consists of:
Gain controlled FM amplier and AGC detector
Narrowband PLL
The 2nd SIF signal from the intercarrier mixer is fed to the input of an AC-coupled gain
controlled amplier with two stages. The gain controlled output signal is fed to the phase
detector of the narrowband FM PLL (FM demodulator). For good selectivity and
robustness against disturbance caused by the video signal, a high linearity of the gain
controlled FM amplier and of the phase detector as well as a constant signal level are
required. The gain control is done by means of an ‘in phase’ demodulator for the 2nd SIF
signal (from the output of the FM amplier). The demodulation output is fed into a
comparator for charging or discharging the integrated AGC capacitor. This leads to a
mean value AGC loop to control the gain of the FM amplier.
The FM demodulator is realized as a narrowband PLL with an external loop lter, which
provides the necessary selectivity (bandwidth approximately 100 kHz). To achieve good
selectivity, a linear phase detector and a constant input level are required. The gain
controlled intercarrier signal from the FM amplier is fed to the phase detector. The phase
detector controls via the loop lter the integrated low radiation relaxation oscillator. The
designed frequency range is from 4 MHz to 7 MHz.
The VCO within the FM PLL is phase-locked to the incoming 2nd SIF signal, which is
frequency modulated. As well as this, the VCO control voltage is superimposed by the
AF voltage. Therefore, the VCO tracks with the FM of the 2nd SIF signal. So, the
AF voltage is present at the loop lter and is typically 5 mV (RMS) for 27 kHz
FM deviation. This AF signal is fed via a buffer to the audio amplier.
The correct locking of the PLL is supported by the digital acquisition help circuit
(see Section 8.6).
8.14 Audio amplier and mute time constant
The audio amplier consists of two parts:
AF preamplier
AF output amplier
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