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參數資料
| 型號： | 935260827112 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PDIP32 |
| 封裝： | 0.400 INCH, PLASTIC, SOT-232, SDIP-32 |
| 文件頁數： | 36/38頁 |
| 文件大小： | 300K |
| 代理商： | 935260827112 |
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1998 Feb 09
7
Philips Semiconductors
Product specication
Multistandard VIF-PLL with QSS-IF and
AM demodulator
TDA9811
Video buffer
For an easy adaption of the sound traps an operational
amplifier with internal feedback is used in the event of B/G
and L standard. This amplifier is featured with a high
bandwidth and 7 dB gain. The input impedance is adapted
for operating in combination with ceramic sound traps. The
output stage delivers a nominal 2 V (p-p) positive video
signal. Noise clipping is provided.
SIF amplier 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 20. 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.
Internal voltage stabilizer and 1
2VP-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 the audio output signal the constant reference voltage
cannot be used because large output signals are required.
Therefore this signal refers to half the supply voltage to
achieve a symmetrical headroom. For ripple and noise
attenuation the 1
2VP voltage has to be filtered via a
low-pass filter by using an external capacitor together with
an integrated resistor (fg = 5 Hz). For a fast setting to 12VP
an internal start-up circuit is added.
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